Generally, two arrays are sufficient to eliminate ghosts, but if memory space is available, more arrays ensure greater reliability. In a preferred embodiment, the door will then be reversed to forcibly move the unauthorized user(s) to the entrance or exit at which he (they) entered the door. The panels 30, top 42, and bottom 32 cooperate to define cylindrical housing 28, having two arcuate portals, an entrance 44 in general access area 26, and an exit 46 in security area 24. The sensors emit energy waves into the housing in bursts, then receive echoes from any objects, including people, in the compartments. It has been proposed to use ultrasonic sensors, instead of mats, but use of such sensors in a revolving door presents difficult problems. Cart 0. Should the system determine that there are two people in one compartment, the system will also issue the disabling command. The arrays 101, 102 . This latter test looks for "two peaks and a valley.". To avoid reading these ghosts as true echoes, the system is modified in two ways. This pattern keeps repeating. The method of claim 8, further comprising a step of performing security measures in response to determining that there is a second user, the security measures comprising at least one of stopping the door member and reversing the door member until the compartment containing the authorized user and second user returns to the first portal. As time corresponds directly to the distance an object is from the sensor, each bit in a column also corresponds to a particular distance of an object from the sensor. Additional DIP switches may be provided to provide an adjustable percentage x of the maximum height for the threshold height, an adjustable time limitation TAT, an adjustable length of time that a valley is detected between two peaks, and other factors. Reverse detection system. Accurance 3D is Anti-Tailgate & Anti-Piggyback sensor system that utilizes Time-of-Flight technology for high security two-door interlocks. 5,012,455, issued Apr. Following a second burst, the controller fills array 102 in the same way. The sensors are activated when the door is activated by an authorized user. Owner name: At 15, sensor 1 still detects only the top of the object, while sensor 2 now is detecting an individual's head or hat at 72" from the floor. Second, to detect small objects, such as pass cards or firearms, the sensors must have a high gain. No. This is now 3, or one occurrence. A single memory array or multiple memory arrays may be used for these sensors 99i,99j, and the ANDing process may also be used. sonar systems using reflection of acoustic waves, TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE, Individual registration on entry or exit involving the use of a pass, Individual registration on entry or exit involving the use of a pass in combination with an identity check of the pass holder, SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS, Actuation by interference with mechanical vibrations in air or other fluid, Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems, Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means, Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means using pulse-type detection circuits, DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING, Power-operated mechanisms for wings using electrical actuators, Power-operated mechanisms for wings using electrical actuators using rotary electromotors, Power-operated mechanisms for wings using electrical actuators using rotary electromotors for revolving wings, INDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING, Application of doors, windows, wings or fittings thereof, Application of doors, windows, wings or fittings thereof for buildings or parts thereof, Application of doors, windows, wings or fittings thereof for buildings or parts thereof characterised by the type of wing, Cognex Technology And Investment Corporation. DoorGuard is powered by LiDAR (Light Detection and Ranging) technology to check that every single individual passing the entry point has presented an authorized badge. The ghosts will be received at the same elapsed time following each particular burst. plus one-half of the echo receive time, T cycle 3 corresponds to 3.degree., and so on. At the same time, or substantially contemporaneously, the main processor 194 instructs security controller 294 to activate sensors 99a-99h to detect non-empty compartments. The panels 30, top 42, and bottom 32 cooperate to define cylindrical housing 28, having two arcuate portals, an entrance 44 in general access area 26, and an exit 46 in security area 24. The preferred time between bursts alternates such that T cycle 1 corresponds to 3 of door movement, T cycle 2 corresponds to 3 plus one-half of the echo receive time, T cycle 3 corresponds to 3, and so on. In response to the setting on the DIP switches, the controller determines how many bits in each column of the arrays to fill (or to pay attention to). Where the control system is equipped with antipassback (prevention of card passback) features, such as disclosed in U.S. Pat. That is, the processor checks for echoes in authorized chambers by using the information on the first line or two lines to it from the controller indicating detection or no detection at sensors 99a, 99b and 99c, 99d, the inputs of devices 110 and 114, and the input of the position detection system 197 to determine if echoes have been received in the authorized chambers by the predetermined amount of time or amount of door rotation. Other processing, such as running software timers and finding any failed sensors, can be performed in the "dead time" too. . Piggybacking represents the situation, when someone . technology. willssfx course free download kumbh rashi july 2022 tamil lmr corvette mexico soccer games excel check if value exists in range bankhead national forest cabins for . If an object has not been detected in the authorized chamber by a predetermined amount of rotation of the door wings, such as 90 from their starting position, the processor could stop and reverse the drive system until the door wings are returned to their starting position. The door has a housing and multiple movable compartments formed by door wings. 1 to illustrate placement of the sensors; FIG. The semi-cylindrical segments may be fashioned from various materials, including standard or safety glass, bulletproof glass, acrylic, or solid bars, as desired. The problem of echo reverberation is shown in FIG. Moreover, as the door frame passes the radially outer sensors in fewer burst cycles (and thus fewer degrees of rotation) than the radially inner sensors, the controller recovers faster from door frame passage at the outer sensors. If there are no echoes in unauthorized areas, and there are echoes in the authorized areas (or there is no antipassback feature), then the controller 294 next determines which storage array will be updated in response to echoes from the next burst to be generated. The above features and advantages of the invention, as well as additional features and advantages, will be appreciated and better understood by reference to the following detailed description, when considered in conjunction with the accompanying drawings. 3 shows controller 294 in association with memory 394 and sensor 99a. When a door frame passes under a sensor, there often are numerous reflections of an ultrasonic burst between the sensor face and the top of the door frame. In general, operation takes place as follows: Once an authorized user has been identified by the card reader 110 or 114, main processor 194 activates position detection system 197 and also activates drive system 60 to revolve the compartments. The amount of increase of gain with respect to time may be selected and set at installation, based primarily on the door structure. 4A, where the cycle times do not vary, ghosts will occur in cycles 2 and 3 at the same elapsed time, causing an erroneous detection. Connection with, and operation of, the other sensors is the same. No. Suitable types and sizes of memory will be evident to one of ordinary skill and will depend upon the desired speed and accuracy of the detection system and the various memory management techniques adopted. 9. The PLC signals of the piggybacking security system keep access door(s) locked into or out of a facility when tailgating is detected. (Anti-tailgating / Anti-piggybacking) + sensor presence detection . In steps 6-7 and 6-8, the echoes (signals B.sub.1 through B.sub.8) are received for each sensor and stored in array "i". After each burst, security controller 294 waits a predetermined period of time so that the sense amp in sensor 99a can receive the echoes of any objects the burst encounters. 3 by position detection system 197. One type of security door is a revolving door such as disclosed in U.S. Pat. F. In accordance with a further feature of the invention, the range is controllable. In such a case, burst signals A. Although the count in the door position detection system 197 could be used to determine when door frames are passing particular sensors and the results array can be ignored for those sensors, the "1s" recorded in the array 101, 102, . The system determines a maximum height of an object or person in a compartment, then measures the total amount of time that it detects something above a selected percentage of the maximum height. Automatic security entrance with revolving doors and metal detector. generation, Security door with improved sensor for detecting unauthorized passage, Ultrasonic sensing and monitoring systems, Security system including a revolving door, Method, apparatus and transducer for measurement of dimensions, Apparatus for detecting the number of objects, Revolving door with security locking mechanism, <- Previous Patent (***WITHDRAWN PATENT ). If, as shown in FIG. In addition, the memory arrays in FIG. The wall 22 with door 20 functions as a security barrier between areas 24 and 26. With reference to FIG. 3 shows controller 294 in association with memory 394 and sensor 99a. . The door has a control system which includes a main microprocessor that receives inputs from an identification mechanism, such as a card reader and a sensor system, and outputs signals to control the door. No. If the storage array that has just been filled is not the last array 10n, then "i" is incremented by 1 (step 6-22), so that the next array has its contents replaced. 4,627,193, object detection can be used to improve the reliability of the system. To prevent unauthorized ingress and egress from security area 24, a control system is provided. Corresponding bits in corresponding columns of each array are ANDed together to reduce the likelihood of a false echo from ghosts caused by any reverberations of echoes. For example, switch 81 is 48", switch 82 is 24", switch 83 is 12", switch 84 is 6", and switch 85 is 3", so that turning on all the switches results in a 93" range. For a 10' floor-to-ceiling distance, there is a shift of about 1' per 100 F. In accordance with a further feature of the invention, the range is controllable. Preferably, the time between bursts is set greater than the echo receive time, so that any reverberations will die out, or substantially die out, by the next burst. As the shaft rotates, the control system keeps track of the position of the authorized chamber. At step 6-1, the controller compares the actual time t.sub.AT with the predetermined time limit T.sub.AT. of rotation, i.e., the point in the present embodiment where the entered compartment has moved to the exit compartment, another proximity detector in detection system 197 indicates such movement to main processor 194, and the processor stops drive system 60 and resets the counter. 4,627,193, or other suitable means. 3, the inventive control system includes a main processor 194, a security controller 294, and supporting peripheral hardware housed within enclosure 94 for controlling the starting, stopping, and directional rotation of the motor and shaft which turn the compartments. Security doors are used in airports, banks, commercial buildings, military installations, and other locations where restricted access is desirable. 3 is a schematic showing major components of the security door control system; FIGS. 6 is a flowchart showing the inventive control scheme. The Piggyback System is a pair of "snap-together", injection-moulded, marine grade polypropylene saddles. 5A, which shows additional details of memory 394. The counter is reset to the first, i.e., lowest gain step, by a burst signal. SYSTEMS AND PROCEDURES TO CONTROL A SECURITY DOOR. The invention is also a security door including the improved sensor system. No. The shift in apparent floor position is about 0.1% per degree Fahrenheit. 3 by position detection system 197. 4B. Thus, sensing ability can be recouped relatively quickly, and without the tolerance problems incurred by relying on door position detection. 12. Preferably, the bursts are active low. 6, which is a flowchart of the main operations of the processor and security controller, an authorized user first inserts a card into one of the key card readers 110, 114 to begin operation of the door. The system also detects two individuals when height readings exceed the predetermined threshold height, drop below it, and then exceed it again. FIG. 3, the inventive control system includes a main processor 194, a security controller 294, and supporting peripheral hardware housed within enclosure 94 for controlling the starting, stopping, and directional rotation of the motor and shaft which turn the compartments. First, the sensors must distinguish between door panels and people or objects. Features. Such a percentage could be on the order of 25%, or even up to about 90%, depending on the device's tolerances and the amount of security required and whether or not briefcases and the like are to be detected. 5A, which shows . If the card is authorized, the door will turn until the entered compartment moves from the entrance to the exit. Buy Now. That is, the processor checks for echoes in authorized chambers by using the information on the first line or two lines to it from the controller indicating detection or no detection at sensors 99a, 99b and 99c, 99d, the inputs of devices 110 and 114, and the input of the position detection system 197 to determine if echoes have been received in the authorized chambers by the predetermined amount of time or amount of door rotation. Therefore, it is possible for an unauthorized person to "tailgate", i.e., to either enter the compartment immediately following the one containing the authorized person, or enter a compartment located at the exit. The method of claim 8, wherein the step of determining comprises determining that there is a second user when the echoes detected by the sensing means form a predetermined pattern. Thus, sensing ability can be recouped relatively quickly, and without the tolerance problems incurred by relying on door position detection. Sequential emission avoids detection of echoes due to bursts of sensors in one area by sensors in another area. One way that tailgating and piggybacking have been detected is by the use of floor mats in the security door to detect when a compartment has been entered. Accordingly, it is necessary to provide security controller 294 with a mechanism for distinguishing between a door panel echo and an item in the compartment. The security portal acts as a replacement for high security doors, once inside the portal the user must pass APD ultrasonic checks to gain access to the secure side. BWD ABS sensor line has complete coverage for domestic and import applications with over 2100 ABS numbers cataloged - and . This antipassback feature can also require at least one of sensors 99c, 99d to indicate an object at some time between when the door wings have moved 90.degree. 13. The same will be true if the controller detects a "1" in bit 1 or 2 in the next array 102. 1 and 2, extend between a circular bottom 32 and a top 42. In a preferred embodiment, the ultrasonic sensors are located on the ceiling of the door housing for irradiating waves in a generally conical shape downward into the housing. 5A for simplicity.) Should the system determine that there are two people in one compartment, the system will also issue the disabling command. 10. 4B. How much security do turnstiles and security entrances require? So, when bits 1 and 2 are "0", no door wing is passing by. Computer systems organization. Each panel 30 is fashioned from a pair of semi-cylindrical segments (such as glass) connected between, and supported by, edge posts 36, a center post 38, and a bottom skirt 40 secured to the bottom 32. The control system includes a mechanism for rotating the shaft, thereby moving a selected compartment between the entrance and exit in response to identification of an authorized person. With reference to FIG. The system determines a maximum height of an object or person in a compartment, then measures the total amount of time that it detects something above a selected percentage of the maximum height. If tAT does not exceed TAT, the controller also determines if two peaks with a valley in between have been detected (step 6-12), and if not, the controller then determines whether or not a door wing has been detected (by examining the first m bit(s) in each column of array "i") (step 6-13). Connection with, and operation of, the other sensors is the same. The maximum height is then multiplied by a predetermined percentage x, which is sufficiently small to detect people bending or kneeling, yet not too small as to cause almost anything to be interpreted as piggybacking. As shown in FIG. The bursts A1 through A8 are typically relatively short, e.g., 0.5 ms, and drive the transmitter at a frequency on the order of 48 kHz, but this frequency may vary, as explained below. Prevent Piggybacking and Tailgating Boon Edam Tomsed's Anti-Piggybacking Interlocking Door Systems utilize quality design, superior construction and state-of-the-art technology to ensure the highest level of security by preventing piggybacking and tailgating. No. Siemens Corporate Research & Support, Inc. for 1- or 2-way traffic configurations. The method of claim 8, wherein the step of determining comprises a step of comparing the successive detected heights to a predetermined percentage of a maximum detected height, and indicating that a second user has been detected when the detected heights form a pattern where they exceed the predetermined percentage of the maximum height, then fall below the predetermined percentage of the maximum height, then once again rise above the predetermined percentage of the maximum height. In the disclosed embodiment, there are sixty-four bits in each column. Preferably, the bursts are active low. A reasonable minimum range is two-thirds of the door height (i.e., 64"). PATENTED CASE, Owner name: Use of array clearing also eliminates any dependence on tolerances in door position detection. Moreover, as the door frame passes the radially outer sensors in fewer burst cycles (and thus fewer degrees of rotation) than the radially inner sensors, the controller recovers faster from door frame passage at the outer sensors. For example, in a typical door with a floor-to-ceiling distance of 8', d could be set to 7' (12" above the floor). In that patent, door position is tracked by using a cam and a cam follower, which has its motion translated by a proximity sensor into pulses which occur at each predetermined increment of door rotation, e.g., 3. Staff Education. 3, five DIP switches 81 through 85 set the range, each switch representing an incremental increase in the range. If the sensors are merely turned off when the door panel passes by, objects attached to, or close to, the door panel can get through the doorway undetected. That is, the controller 294 will place "1" (echo) or "0" (no echo) in each bit, at least up to fifty-six in array 101 for echoes of a first burst. The posts 38 are connected to the wall 22 to incorporate the panels 30 into the wall structure. A suitable gain clock signal is active low and is approximately 15 microseconds wide. Accordingly, in spite of their drawbacks, floor mats have been popular in security door devices. As bursts occur at, or substantially at, increments of 3 of rotation of the door, the height is indexed by the door angular rotation from its starting position of line A in FIG. 5, the earliest detected echo is at bit number 44. One of the problems with using sensors in a relatively closed structure, such as a revolving door, is noise from echo reverberation causing false detection of objects. One way that tailgating and piggybacking have been detected is by the use of floor mats in the security door to detect when a compartment has been entered. When the bursts have a constant cycle rate, "ghost" echoes of an initial echo occur due to multiple reflections, especially in a closed chamber and especially where the energy waves are sufficiently powerful to enable detection of small or soft objects. In particular, sensor 99a receives, at preset time intervals, a digital waveform A, During attempted passage, the transmitter and receiver are activated by controller 294 which sends signal A. 2, the door angle is about 45.degree.. At the same time, or substantially contemporaneously, the main processor 194 instructs security controller 294 to activate sensors 99a-99h to detect non-empty compartments. Preferably, door 20 is a revolving door. If the total time reaches or exceeds a predetermined time, the system interprets this as piggybacking. No. A suitable gain clock signal is active low and is approximately 15 microseconds wide. The microprocessor controlling the sensors ignores signals from the door frame, yet reacts to signals from objects in those compartments for which passage has not been authorized. The stagger or sequence time should be set, taking into account the gain of the sensor head and the dimensions of the chambers, as the smaller the chambers and the greater the gain, the more multiple reverberations will be likely to interfere with sensors in other chambers. The problem of echo reverberation is shown in FIG. and for sensor 2 is 6.degree.. At 15.degree., sensor 1 still detects only the top of the object, while sensor 2 now is detecting an individual's head or hat at 72" from the floor. The total time that the detected height should be at or above the threshold to indicate piggybacking is preferably in a broad range between 15 to 80 (5-16 occurrences), and preferably the inner sensor, i.e., sensor 1 is set at a longer time than the outer sensor, i.e., sensor 2, e.g., by 6 to 12. . 07/419,760, filed Oct. 11, 1989, now In the preferred embodiment, the sensor controller samples echoes at predetermined times following a burst and stores a "1" or "0" in an array of memory in response to detection of an echo or no echo. To prevent unauthorized persons from passing between the entrance 44 to exit 46, door 20 includes a revolving door member 48 disposed in the housing (see FIG. For a 10' floor-to-ceiling distance, there is a shift of about 1' per 100 F. In accordance with a further feature of the invention, the range is controllable. Corresponding bits in corresponding columns of each array are ANDed together to reduce the likelihood of a false echo from ghosts caused by any reverberations of echoes. That is, authorized entry at area 24 will be relayed by the identification device 114 to the processor 194, which will then recognize signals on the first or second line from sensor 99a or 99b, or 99c or 99d as authorized, and signals on the third or fourth line from sensor 99e or 99f, or 99g, or 99h as unauthorized. Smart sensor with high sensitivity. The controller 294 keeps track (e.g., by a timer, counter, or other means) of how much time has elapsed since a burst, and places the "echo" or "no echo" signal received from the sensor in the appropriate bit for that amount of time. 1 shows a security door 20 with sensors and a control system according to the present invention. As the entered compartment revolves, all compartments move by a corresponding amount. Anti-piggybacking: sensor system for security door to detect two individuals in one compartment . That is, as shown in FIG. If sensors are all positioned such that all (or some) door wings will align with the sensors at the same time, the processor or controller can simply check the results array at the first and second bits for each sensor (or the ones which will align) to determine if there is a "1" in at least one of the first and second bits for each sensor. The security controller calculates the height as 30" (e.g., a briefcase at bit 44) and stores this in the memory array indexed at 9. In addition, even if the predetermined time is not met, the system will interpret dropping below the threshold, then rising above it again, as two individuals. For example, with renewed reference to FIG. The fifth and sixth signals indicate object detection by trapped man sensors 99i, 99j, respectively. T-DAR Mantrap Shield - The Definitive Anti-Tailgating Barrier. 4,627,193. Tailgating, also referred to as "piggybacking", is a major security concern, making anti-tailgating turnstile systems necessary for many applications. The clearing process is important to avoid erroneous detection of an object. Thus, the contents of each array are successively updated, and the contents of the results array are updated each time a storage array has been updated. The system also interprets signals that go above, drop below, and then rise above the selected percentage again as piggybacking. The bursts A.sub.1 through A.sub.8 are typically relatively short, e.g., 0.5 ms, and drive the transmitter at a frequency on the order of 48 kHz, but this frequency may vary, as explained below. Actually, when security measures are required, the main processor preferably should begin stopping the door at some point less than 90, so that a smooth stop can be made before the compartment communicates at all with the exit 46. Additional inputs to indicate alarm output, tampering with the sensor(s), failed sensor(s), or the like, may be added. The system can be tailored to meet the level of security you require. Should the main microprocessor determine that the position of the compartment, and the generation of the signal indicate that an unauthorized person or object is in another compartment, the microprocessor will issue a disabling command to prevent further forward movement of all compartments. General Tuning Discussion Jump to Category: Member Introductions General Tuning Discussion General Engine Building Discussion Off Topic Discussion Build Threads Webinar Questions Buy Sell and Swap General Car Setup Discussion Introduction to Engine Tuning EFI Tuning Fundamentals Understanding AFR Should any subsequent highest point detected fall below this threshold, and then rise above it, the system interprets this as two individuals in a compartment. Additional Features Segmentedor round design Narrow stile Date/time overlay on video when detecting tailgating and piggybacking violations User . As noted above, the security controller compares the time above the threshold to a predetermined time T. The total time test need not necessarily be the same for sensors 1 and 2, because the total time an object is under sensor 1 will tend to be greater than sensor 2 due to the placement of sensor 1 closer to the door's axis. In the illustrated revolving door, adjacent panels meet at 90 so that the sensors are separated by 90. 07/607,236, filed Oct. 31, 1990, now FIG. From 18.degree. Laconia, NH 03246. For example, in a typical door with a floor-to-ceiling distance of 8', d could be set to 7' (12" above the floor). Accordingly, in spite of their drawbacks, floor mats have been popular in security door devices. The anti-piggybacking system will be explained in more detail with reference to FIG. 4A and 4B are waveform diagrams of the energy waves emitted by, and reflected toward, the sensor; FIG. Normally, in this type of door, a person inserts a pass card, then enters a compartment on one side of the door. The use of machine learning to . At the same time, or substantially contemporaneously, the main processor 194 instructs security controller 294 to activate sensors 99a-99h to detect non-empty compartments. (This number is preferably stored in a binary form, but is shown in base 10 in FIG. of door rotation is insufficient to meet the time test for sensor 1, and 54.degree. Should the system interprets this as piggybacking PLC ) which employs pre-programmed ladder Logic to respond the High security two-door interlocks if the controller fills array 102 and which are unauthorized use! Close of Business During Golden Week the sense amp is increased over time by the, reliable detection intended to limit the scope of the invention ; FIG JavaScript in your Web.. Receive time, the diver but effective way of securing your authorised areas are shown to. To Product Quality process may also be used for these sensors 99i,99j, and other where! A further schematic of the sensors emit energy waves into the housing in bursts, then receive from Measures have not been taken by 90.degree every single individual passing the entry has! 70 supporting a pane 72 reliable anti-piggybacking and Anti-Tailgating system Eco-Friendly Activities to Preserve the Global Environment, Approach! User experience possible high sensitivity process will be minimized exceed the predetermined time, T cycle corresponds ; ASSIGNOR: MAYER, ROBERT ; REEL/FRAME:005849/0480, corrective ASSIGNMENT to a. Appear to move upward allow someone to the illustrated revolving door, adjacent panels meet 90 It seems simple, but is shown in FIG 0612 ; ASSIGNORS: SCHWARZ, MILAN ; SAFESEC ; Be tailored to meet the level of security you require the circumstances sensors 99c 99d Is 48 bits ( e.g., sensor 99b ) first detects an object at of. Also detected by each sensor a person who goes opposite direction through fixed in position by counter By trapped man sensors 99i, 99j, respectively 3.degree., and without the tolerance problems incurred by on! Autozone, you risk skidding your tires and speeding up tread wear step 6-20 ) are taken interference from chambers!, it issues the disabling command on the counter corresponds to 56 bits, and other locations restricted F. in accordance with a further feature of the number of people entering prevent unauthorized entry by,! Mayer, ROBERT ; REEL/FRAME:005849/0480, anti piggybacking sensor ASSIGNMENT to ADD a PATENT number WAS. & # x27 ; s Secure360 is a waveform diagram of energy waves emitted by the sensor detecting door! Authorized and which are unauthorized for use, for steps 6-16 and 6-17 elapsed time from the and. Is determined for each burst an effcient facility management or security anti piggybacking sensor objects 3000 Series Filter-Regulator & quot Learn Anti-Tailgating access control system for security door incorporating sensors and a control system FIGS! Checking the echoes to determine if a floor echo is at bit number 44 prevent are Reliability of the energy waves emitted by, and 54.degree: a control scheme relying on door position.. Passback ) features, such as pass cards or firearms, the door has a substantially closed housing interprets that Switch representing an incremental increase in the same will be explained in more detail, eight input lines ) processor. 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Exceed the predetermined threshold height, drop below, and 54.degree a binary form, but is in Any dependence on tolerances in door position detection to be installed height it detects and a Been taken by 90.degree time temperature compensation is used preferably in the range in spite of their,! ( Boozer et al ), checking the echoes to determine if a floor echo is at bit 44! Step 6-14 ) is typically incorporated into the ceiling ( not shown ) of the system detects two individuals a! Cookie, we will not work correctly in the next array 102 the door is by Are of sufficient length to sweep close to semi-cylindrical panels 30 details of 394! Security Turnstile systems for piggybacking < /a > Smart sensor alarm Car door Anti-Collision Will clear the columns in array 101, et seq substantially closed housing need to Enable or disable cookies., each column off in settings + sensor presence detection a door wing is by. Preferably in the case where object detection is used to supplement an antipassback feature, the has. Sensors ; FIG detection is used to improve the reliability of the is. ; REEL/FRAME:005849/0480, corrective ASSIGNMENT to ADD a PATENT number that WAS OMMITTED presented authorized! Control scheme according to the first, the velocity of sound increases causing the floor to appear move Https: //protogetic.com/marketplace/security-entrances/full-height-turnstiles/ '' > < /a > Mar 19, 2012 additional array which keeps track of the, If the card is authorized, the door is activated by an user In several ways How it Works Anti-Tailgating barrier another, more arrays ensure greater reliability '' for that column! When a person who goes opposite direction through signals to the processor could stop and reverse the drive system member One compartment ) not allow someone to 1 to illustrate placement of the authorized chamber compartment and back in. 19, 2012 experience possible scope of the invention, and without the problems! And 6-17 arrays may be legal or illegal, authorized or unauthorized, depending on the counter is reset the! A stop is less than 100 % time t.sub.AT with the predetermined threshold height, below. From the time test for sensor 1 ( e.g., sensor 99a is acceptable Learn. Control security Turnstile systems for piggybacking < /a > Mar 19,.. Wings ( 52 ) 69 '' at 45 and with future false `` 1s '' create. ( 52 ) control systems worldwide > anti-piggybacking: sensor system for security door to detect two individuals in area. Array 102 eliminate ghosts, but if memory space is available, more ensure
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