CN113885091B - Passageway detection device, personnel's passageway device and goods detection channel device - Google Patents

Abstract

The invention discloses a channel detection device, a personnel channel device and a cargo detection channel device, and belongs to the technical field of security gate channels. The problem of low detection accuracy rate caused by that the laser intensity is weakened due to the adoption of a physical weight mode and a plurality of laser beams are difficult to accurately, reliably and continuously align to a laser detection device at the same time is avoided by setting the laser signals sent by the n laser generators as the logic weight and sequentially reducing the logic weight; the light scattering device with the area far larger than that of the photosensitive area of the photosensitive detection device is arranged, so that the probability of laser alignment is improved, and the detection accuracy is improved; the light scattering device reduces the laser brightness in unit area, reduces the damage of the photosensitive detection device by high-brightness laser, and prolongs the service life of the photosensitive detection device; by setting 8 laser generators and 8 photosensitive detection components, 8 photoelectric signals are generated, and the photoelectric signals correspond to 8 bits of one byte, so that the laser optical system is convenient to integrate with a computer system.

Description

Passageway detection device, personnel's passageway device and goods detection channel device

Technical Field

The invention relates to a channel detection device, a personnel channel device and a cargo detection channel device, and belongs to the technical field of security gate channels.

Background

The security gate is the most common equipment for managing pedestrian flow and regulating pedestrian access, and the essential function of the security gate is that only one person passes through once through blocking and releasing, so that the security gate can be used for access of various occasions, managing pedestrian flow and regulating pedestrian access, such as high-speed rails, subway entrances and the like. And the following problem needs to be accurately and reliably solved only by one person at a time. The detection of the personnel access system which is produced in a set mode in the current market mainly comprises two modes: firstly, an infrared correlation detection mode is adopted; secondly, the detection mode of the photographic system is as follows:

the infrared radiation detector is called an Active infrared intrusion detector (Active infrared detectors) in the whole name, and the basic structure of the infrared radiation detector comprises a transmitting end, a receiving end, a light beam intensity indicator lamp, an optical lens and the like. The detection principle is that infrared rays emitted by an infrared light emitting diode are focused by an optical lens, so that the rays are transmitted to a long distance, and finally the rays are received by a photosensitive transistor (also known as an infrared sensor) at a receiving end. When an object blocks the infrared ray emitted by the emitting end, the receiving end can not receive the infrared ray, so that an alarm can be given. But infrared is an invisible light and is diffused and, after being projected, forms a cone beam in the initial path stage, the ideal intensity of which decays inversely square with the emission distance as the emission distance increases. Therefore, the traditional active infrared intrusion detector only has two-beam, three-beam and four-beam types and is often used for outdoor enclosure wall alarm. And infrared correlation for people passage systems has currently reached 24 infrared beams. However, as mentioned above, infrared rays tend to have a relatively large divergence angle, and the "light" spot is relatively large. Therefore, the infrared sensor cannot be arranged too densely. Otherwise, a beam of infrared light may be detected by several infrared sensors simultaneously. Furthermore, multiple infrared rays may be detected simultaneously by one infrared sensor, which causes confusion. Therefore, in the infrared correlation detection mode, the minimum distance between adjacent infrared sensors cannot be smaller than 10 cm.

However, even if the distance between the infrared sensors is set to be greater than 10cm, the trailing problem cannot be detected strictly because if the distance between two persons is less than 10cm, the infrared rays are continuously blocked. For example, if the distance between the four pieces of plum and the three pieces of plum is only 5cm, the three pieces of plum are still at the position for shielding the infrared rays when the four pieces of plum are close to the three pieces of plum and the three pieces of plum are close to each other and move forward, and the four pieces of plum also shield the infrared rays. However, the infrared correlation detection method cannot detect whether two persons or one person blocks the infrared ray. Therefore, when the fourth plum goes ahead immediately after the third plum, and the third plum leaves the position for shielding the infrared ray, the fourth plum still shields the infrared ray. Therefore, the infrared correlation detection method may misunderstand that the zhang san is still at a position for blocking the infrared ray, and thus it is impossible to detect that the zhang san has passed but the trailing person blocks the infrared ray. Until the fourth plum moves immediately before the third plum, and the fourth plum leaves the position where the infrared ray is shielded, the infrared correlation detection mode does not consider that the third plum passes through. Obviously, lie four has succeeded in passing immediately after zhang three, but the infrared correlation detection mode has not been detected. Therefore, when the distance between the four pieces of plum is just 5cm and the three pieces of plum are just next to each other, the distance between the infrared sensors must be less than 5cm in order to detect the trailing in the infrared correlation detection mode. That is, the denser the infrared generator and sensor are arranged, the more accurately and reliably trailing can be detected. But as previously mentioned, infrared sensors cannot be placed too densely because of the large "light" spot. In addition, in an extreme case, the plum four is tightly attached to the plum three, the distance between the plum four and the plum three can be only 1 cm or 2cm, and the infrared correlation detection mode is not enough. As for the infrared sensors with the distance of more than 10cm for detecting and identifying the gait, the accuracy and the reliability are lower, and the speed is very slow. Many people passageway systems that use infrared correlation detection mode to prevent following use double gate, just want to carry out complicated logic of discerning the following for a long time to trade higher discernment accuracy and reliability of following. However, the method is basically not suitable for large flow fields such as subways and railways, and can quickly cause serious crowds and overstocked crowds.

The basic idea of detecting the trailing is to count the face, the legs, the head or the shoulders of the person by using intelligent technologies such as face recognition, gait recognition, machine vision and the like. The method is high in cost, and especially, the multiple face recognition assemblies are used for three-dimensional detection. The speed is slow, the influence of the environment is great, and the accuracy and the reliability are not high. Because some luggage or items may be mistaken for a person's head, the intended trailing person may also be intentionally hidden, disguised and evaded from such head detection. However, even with an intelligent camera system, it is not always possible to identify trails reliably, efficiently and accurately at low cost. Because the face recognition component with several human heads can only find that the number of human heads in a certain area is more than (more than or equal to 2), if the judgment is trailing only by the human heads, misjudgment is possible; because if the persons are at rest or close to rest, it is not trailing even if the number of persons in a certain area is high (2 or more). In addition, if the face recognition component of several people finds that the number of people in a certain area is more than (2) and is not in a static state, but the people backward, the people are not trailing, and the people may be trailing in correction. Therefore, trailing is a dynamic process that must take into account speed and direction. At present, the face recognition assembly for several people is difficult to achieve the purposes of distinguishing the moving direction and calculating the moving speed in a certain direction efficiently, accurately and reliably with low cost, but the calculation of the moving speed in a certain direction is favorable for preventing trailing to a great extent. With respect to several faces, essentially the same as a human head, but the difficulty may be greater. As for several people's legs and shoulders, the accuracy and reliability are much lower. More importantly, in many locations, photography and camera systems are not allowed or suitable for privacy, cost, or other reasons. Therefore, it is not universal to use a camera system to prevent the trailing.

Based on the above two disadvantages, CN212623139U proposes a device for identifying trailing by using a laser light curtain, but the laser light curtain is generated by back-and-forth reflection of a laser beam, and the sensitive and reliable photosensitive area of the photosensitive detection device is often small, such as a small circular dot with a diameter of only 1mm, and after a laser beam is reflected back and forth several times, not only the brightness is reduced and the light spot is increased, but also it is almost impossible to align the small circular dot in dozens or even dozens of photosensitive detection devices simultaneously, accurately, reliably, and continuously. Even if the production and assembly precision is extremely high and can reach the micron level, a personnel access system needs to frequently pass through personnel, luggage and the like, places such as subway stations, railway stations and the like need to frequently pass through various vehicles, and floors all have micro vibration, so that the gate inevitably has the micro vibration and displacement. If there is a spot vibration, the laser beam will be reflected back and forth ten or even tens of times, and the spot vibration will be amplified by many times. In addition, if there is a small displacement, the laser beam will be reflected back and forth tens of times or even tens of times, and the small displacement will be amplified by many times. Therefore, in practical applications, it is almost impossible to simultaneously align the dozens or even dozens of laser beams accurately, reliably and continuously with the photosensitive detection devices. This may result in an erroneous input! If only one photosensitive detection device generates an erroneous output, the program logic output is likely to be completely different. In addition, the solution of using the laser light curtain also requires the photosensitive detection device not only to sense light sensitively and reliably, but also to reflect light with high reflectivity! Therefore, the preparation process is difficult and the cost is high.

Therefore, in consideration of the above comprehensive factors, it is necessary to develop an apparatus and method that are more universal and can identify the trailing edge accurately and reliably with low cost.

Disclosure of Invention

In order to solve at least one of the above problems, the present invention provides a passage detection apparatus and a person passage apparatus.

A first object of the present application is to provide a channel detection apparatus, the apparatus comprising: a controller and one or more sets of forward direction detection assemblies; each group of forward detection assemblies comprises a laser emitting module and a corresponding laser receiving module; the laser emission module in each group of forward detection assemblies comprises n laser generators, the corresponding laser receiving module comprises n photosensitive detection assemblies, and n is more than or equal to 3; the n laser generators are sequentially arranged, the n photosensitive detection assemblies are correspondingly and sequentially arranged, and the controller sets the weight of the laser signals sent by the n laser generators to be sequentially reduced according to the arrangement sequence of the n laser generators.

Optionally, the apparatus further comprises: each group of reverse detection assemblies comprises a laser emitting module and a corresponding laser receiving module; the weight sequence of the laser signals emitted by the laser generator in the reverse detection assembly is opposite to the weight sequence of the laser signals emitted by the laser generator in the forward detection assembly.

Optionally, n is 8.

Optionally, the photosensitive detection assembly includes a photosensitive detection device and a light scattering device disposed thereon, an area of the light scattering device is much larger than a photosensitive area of the photosensitive detection device, and the photosensitive detection device detects the laser signal when the light scattering device receives the laser signal at any position.

Optionally, the light scattering device is a light scattering film or a light scattering glue.

Optionally, the controller determines the generated signal according to whether each photosensitive detection component in the laser receiving module receives the corresponding laser signal and the weight of the corresponding laser signal.

A second object of the present application is to provide a people passageway device, which comprises the above passageway detecting device and a solid block, wherein the passageway detecting device is arranged in front of the solid block along the passageway forward direction; and a controller in the channel detection device controls the opening and closing of the entity barrier according to the detection result of the forward detection component and/or the reverse detection component.

Optionally, when the personnel access device includes multiple sets of forward detection assemblies and/or reverse detection assemblies, the controller determines to control opening and closing of the entity barrier according to a comprehensive detection result of the multiple sets of forward detection assemblies and/or reverse detection assemblies.

Optionally, the multiple sets of forward detection components and/or reverse detection components are disposed at different heights, and different weights are set between the multiple sets of forward detection components and/or reverse detection components.

A third objective of the present application is to provide a cargo detection channel device, which includes the above channel detection device, a conveying device and a counter, wherein a laser emission module and a corresponding laser receiving module in the channel detection device are respectively disposed on two sides of the conveying device; the counter is connected with the controller of the channel detection device; the controller determines whether the goods pass through one piece or not according to the detection result of the forward detection assembly and/or the reverse detection assembly, and the counter is used for counting the number of the goods passing through one piece.

The invention has the beneficial effects that:

the laser signals sent by the n laser generators are set as the logical weight to be sequentially reduced, so that the problem of low detection accuracy caused by that the laser intensity is weakened and a plurality of laser beams are difficult to accurately, reliably and continuously align to a laser detection device simultaneously due to the adoption of a physical weight mode is solved; the light scattering device with the area far larger than that of the photosensitive area of the photosensitive detection device is arranged, so that the probability of laser alignment is improved, and the detection accuracy is improved; the light scattering device reduces the laser brightness in unit area, prevents the photosensitive detection device from being damaged by high-brightness laser, and prolongs the service life of the photosensitive detection device; by setting each group of detection devices into 8 laser generators and 8 photosensitive detection assemblies, 8 photoelectric signals are generated and just correspond to 8 bits of one byte, so that the laser optical system and the computer system are convenient to integrate.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a channel detection device provided in one embodiment of the present invention;

FIG. 2 is a schematic diagram of a people path arrangement including only forward detection components in accordance with an embodiment of the present invention;

FIG. 3 is a schematic diagram of a people path arrangement including both forward and reverse inspection elements in accordance with one embodiment of the present invention;

fig. 4 is a schematic diagram of a cargo detection aisle unit comprising only forward detection assemblies according to an embodiment of the invention.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The first embodiment is as follows:

this embodiment provides a passageway detection device, passageway detection device includes: a controller and one or more sets of forward direction detection assemblies; each group of forward detection assemblies comprises a laser emitting module and a corresponding laser receiving module; the laser emission module in each group of forward detection assemblies comprises n laser generators, the corresponding laser receiving module comprises n photosensitive detection assemblies, and n is more than or equal to 3; the n laser generators are sequentially arranged, and the controller sets the weight of the laser signals sent by the n laser generators to be sequentially reduced according to the arrangement sequence of the n laser generators.

As shown in FIG. 1, for convenience of description, the n laser generators in a set of forward detection assemblies are numbered sequentially as (1-1, 1-2, … …, 1-n); the corresponding photosensitive detection components are numbered as (1-1a, 1-2a, … …, 1-na) in sequence. The controller is not shown in fig. 1. The controller is not shown in fig. 1.

According to specific requirements, m groups of forward detection assemblies may be provided, and the serial numbers of the n laser generators in each group of detection assemblies are (1-1, 1-2, … …, 1-n), … …, (m-1, m-2, … …, m-n); the corresponding photosensitive detection components are numbered as (1-1a, 1-2a, … …, 1-na), … …, (m-1a, m-2a, … …, m-na) in sequence. Not shown in fig. 1.

The controller can be a computer or a control chip which can be written with a program; the weight of the laser signals emitted by the n laser generators is set to be reduced in sequence according to the arrangement sequence.

In one embodiment, the n laser generators sequentially arranged in the forward direction of FIG. 1 are set to have sequentially lower weights for the laser signals generated by the laser generator 1-1 with the highest weight and the laser generator 1-n with the lowest weight. The controller determines the generated signals according to whether each photosensitive detection component in the laser receiving module receives the corresponding laser signal and the weight of the corresponding laser signal.

For example, setting: the photosensitive detection component receives a laser signal sent by a corresponding laser generator, the signal generated by the photosensitive detection component is marked as 1, otherwise, the signal is marked as 0, namely, 1 represents that the corresponding laser signal is not blocked, and 0 represents that the corresponding laser signal is blocked.

If the laser signal with high weight is not received by the corresponding photosensitive detection component, namely is blocked, and the signal generated by the laser signal with high weight is 0, the signal generated by the laser signal with lower weight than the blocked laser signal is also 0; and the laser signals with low weight are shielded, so that the laser signals with high weight are not influenced.

For example, if the laser signals generated by the laser generator 1-1 are blocked, the controller sets the laser signals generated by the n laser generators to be blocked. If the laser signal that laser generator 1-2 sent is sheltered from, then the controller will be about to follow-up serial number 1-3, 1-4, … …, 1-n's laser generator to send the laser signal and all set up to be sheltered from, and the laser signal that laser generator 1-1 sent is then not influenced, consequently, laser signal is sheltered from in this application and does not represent the physics and shelter from, but shelters from in the logic.

The specific implementation method can be as follows: the controller sets the final signal of each laser signal as the result of logical AND operation of the signal generated by the controller and the signal generated by the laser signal with higher ownership. Other means, such as programming, may also be used. This is not a limitation of the present application.

It should be noted that, if setting 1 indicates that the corresponding laser signal is blocked and setting 0 indicates that the corresponding laser signal is not blocked, the specific implementation method may perform corresponding logic or operation. The skilled person can determine the corresponding implementation method according to the actual setting situation. This is not a limitation of the present application.

In another embodiment, the weight of the laser signals generated by n laser generators arranged in sequence in the reverse direction of the direction shown in FIG. 1 can be set to decrease in sequence, i.e., the laser generators 1-n generate the highest weight of laser signals and the laser generators 1-1 generate the lowest weight of laser signals. Correspondingly, a person skilled in the art can determine a corresponding implementation method according to an actual setting situation.

Considering that the sensitive and reliable photosensitive area of the existing photosensitive detection device is relatively small, the photosensitive detection assembly in this embodiment includes, in addition to the photosensitive detection device, a light scattering device disposed on the photosensitive detection device, the area of the light scattering device is much larger than the photosensitive area of the photosensitive detection device, for example, the photosensitive detection device may be disposed in a 10mm × 10mm grid, and the grid is covered with a light scattering material, so that the photosensitive detection device covered by the light scattering material can detect the laser signal as long as the light scattering material receives the laser signal. The light scattering material may be a light scattering film or a light scattering glue.

Example two:

based on the passage detection device of the first embodiment, the present embodiment provides a personnel passage device with universality, as shown in fig. 2, the personnel passage device includes a gate and the passage detection device of the first embodiment; the gate door is connected with a controller in the channel detection device, and the controller controls the gate door to be opened or closed according to the detection result of the forward detection assembly.

Specifically, for the example that the passage detection device includes a set of forward detection components, the controller determines the advancing direction and the advancing speed of the pedestrian according to the condition that the laser signals generated by the n laser generators in the forward detection components are blocked:

1. if all the laser signals generated by the n laser generators are blocked and then are sequentially restored from high to low according to the weight, the person is indicated to move forward along the forward direction; and then calculating the forward speed of the person according to the recovery time of the laser signals generated by the laser generators and the distance between the lasers.

2. If the laser signals generated by the n laser generators are blocked according to the weight from low to high, the person is indicated to advance along the reverse direction. And calculating the advancing speed of the personnel along the reverse direction according to the shielded time interval of the laser signals generated by the laser generators and the distance between the lasers.

If more laser beams which are shielded are restored in sequence and then shielded again, basically speaking, the distance between the front person and the rear person is longer, and trailing is unlikely to occur; if only a few "blocked" laser beams are subsequently restored and then "blocked", this basically means that the interpersonal spacing is short and trailing is likely to occur. In specific application, the threshold value of the laser beam which is shielded in the actual scene can be summarized according to the distance between the laser transmitters arranged in the actual scene and the shielding condition of the laser beam when people are in trailing, and when the threshold value is exceeded, the trailing is judged.

Because in principle only the spacing between two persons can cause the laser beam to be "blocked" and then restored; if the "blocked" laser beam cannot be restored sequentially for a long time and none of the laser beams has changed state, i.e., is "blocked" to be restored, or is restored to be "blocked", basically indicating that the interpersonal spacing is as short as approaching zero, then trailing is likely to occur; trailing may also occur if the time interval during which the state of the laser beam is found to be "blocked" and then restored is short. Because this often means that the distance between two people tends to be very small or even close to zero; generally, the shorter the time interval during which the laser beam is "blocked" and then restored in turn, the smaller the separation between the two persons. If the time interval goes to zero, it is probably said that the distance between two persons goes to zero, and this is obviously followed.

Because the laser beam group can also measure the speed, even if the time interval for the laser beam to be shielded and then restored is shorter, the interval between two persons is not necessarily smaller.This time interval is shortened because it is likely that the person is moving at a fast speed. But by calculating the speed, it can be found that the distance between two people is really reasonable and therefore not trailing. Conversely, if the laser beam is "blocked" and then restored for a longer time interval, it does not necessarily mean that the distance between the two persons is longer. This time interval is longer because it is likely that the person is moving at a slow speed. But by calculating the speed, it can be found that the distance between two persons is actually short and thus trailing. Therefore, in practical application, the running speed of the pedestrian can be judged according to the time of the laser beam being shielded and recovered, the acceleration of the pedestrian can be further calculated, specifically, an approximate mathematical model is established for the situation, and the precondition of 'sequential' is taken care of. If the sequential physical occlusion or sequential recovery does not occur, the person or cargo is in a substantially motionless state, and certainly there is no so-called trail, and it is not necessary to discuss the following approximate mathematical model. If the phenomenon that the laser beams are sequentially and physically shielded occurs, the distance between the laser transmitters is d and the unit is meter, and the average time interval that the continuous adjacent laser beams are sequentially and physically shielded is t and the unit is second. The average forward moving speed s ═ d/t of people or goods can also be estimated; here, t is an average time interval in which consecutive adjacent laser beams are physically blocked in sequence from the 1 st laser beam when a person or goods normally passes or passes in the forward direction. If the times of the 1 st, 2 nd, 3 rd, … … th and N th laser beams which are sequentially and physically shielded are respectively t ₁ 、t ₂ 、t ₃ 、……、t _N-1 、t _N At this time t ₁ <t ₂ <t ₃ <……<t _N-1 <t _N . The average time interval t ═ t [ [ (t) ₂ -t ₁ )+(t ₃ -t ₂ )+……+(t _N -t _N-1 )]/(N-1). Where N is the sum of the laser beams of all sets of forward sense elements. For example, each set of forward detection assemblies has 8 laser beams, and there are m sets, so that N is 8 m. The average speed s of the person or goods between the 1 st and 2 nd laser beams can be estimated _1,2 ＝d/(t ₂ -t ₁ ) 2 nd, 3 nd laser beam space for persons or goodsAverage velocity s _2,3 ＝d/(t ₃ -t ₂ ) 3 rd, 4 th laser beam average speed s of persons or goods _3,4 ＝d/(t ₄ -t ₃ ) … … average speed s of person or goods between N-1 and N laser beams _N-1,N ＝d/(t _N -t _N-1 ). Further, the average acceleration a of people or goods between the 1 st and 2 nd laser beams can be estimated _1,2 ≈(s _2,3 -s _1,2 )/(t ₂ -t ₁ ) 2 nd and 3 rd beam interval average acceleration a of person or goods _2,3 ≈(s _3,4 -s _2,3 )/(t ₃ -t ₂ ) … … average acceleration a of person or goods between N-2 and N-1 laser beams _N-2,N-1 ≈(s _N-1,N -s _N-2,N-1 )/(t _N-1 -t _N-2 ). When there is a reverse direction detection device, t ' is measured as the times at which the 1 st, 2', 3', … …, and N ' laser beams are sequentially restored from the 1 st beam from the back to the front ' ₁ 、t' ₂ 、t' ₃ 、……、t' _N In the same manner as above, the average time interval t ', the speed s ' and the acceleration a ' of consecutive adjacent laser beams that are successively restored can be calculated. However, t 'at this time' ₁ >t' ₂ >t' ₃ >……>t' _N . Thus, both the forward detection means and the reverse detection means can calculate the velocity and acceleration. The two are averaged to obtain more accurate speed and acceleration.

According to experience, if n consecutive adjacent laser beams are sequentially restored and then sequentially physically blocked, and

then, it can be determined that the trailing has occurred with a confidence probability p (n) close to 100%. Where n is the number of consecutive adjacent laser beams from the 1 st laser beam, which satisfy the premise of being sequentially restored and then being sequentially physically blocked when a person or goods passes or passes in the forward direction. The 0.05 and near 100% levels herein will vary from application to application and are only illustrated herein. However, the smaller n, the greater the confidence probability P (n), and the closer to 100%. When there is a reverse direction detection device, according to experience, ifThe n' consecutive adjacent laser beams are sequentially restored and then sequentially physically blocked, and

the decision to trail can also be aided with a confidence probability P (n') close to 100%. Here, n' is the number of consecutive adjacent laser beams satisfying the premise that the laser beams are sequentially restored and then are sequentially physically blocked from the 1 st laser beam from the back when a person or goods actually passes or passes. The 0.05 and near 100% levels herein will vary from application to application and are only illustrated herein. However, the smaller n ', the greater the confidence probability P (n'), and the closer to 100%.

When the person or goods move at a constant speed, the relationship between n and P (n) can be modeled with a normal distribution with a desired value of zero, P (n) approximately equal to exp [ -n ] ² /(2σ ² )]I.e. a bell-shaped distribution, where the parameter sigma needs to be estimated experimentally. Since n ≧ 0, this is the single-sided bell-shaped distribution in the first quadrant. Of course, it is generally not possible for people or goods to move at a constant speed, and thus this single-sided bell-shaped distribution in the first quadrant is subject to some distortion. However, the smaller n is, the closer to 1 the confidence probability P (n) is, and the larger n is, the more to 0 the confidence probability P (n) is, the characteristic does not change; when a reverse detection device is present, the relationship between n 'and P (n') can also be simulated with a normal distribution with an expected value of zero when the person or good is moving at a constant speed, P (n '). apprxeq [ - (n') ² /(2(σ') ² )]I.e. a bell-shaped distribution, where the parameter sigma' also needs to be estimated experimentally. Since n' is ≧ 0, this is also in the first quadrant single-sided bell-shaped distribution. Of course, it is generally impossible for people or goods to move at a constant speed, and thus the single-sided bell-shaped distribution in the first quadrant is also distorted. However, the smaller n ', the closer the confidence probability P (n') is to 1, and the larger n ', the more the confidence probability P (n') is to 0, the characteristics will not change;

compared with the technical scheme of the application, the scheme provided by CN212623139U cannot calculate the acceleration because a plurality of laser beams are formed by reflecting a laser back and forth, and there is only physical shielding and no logical shielding. In the case of only a forward detection device, as long asThe 1 st laser beam is physically blocked and all of the 2 nd, 3 rd and … … th laser beams are physically blocked. That is to say t ₁ ＝t ₂ ＝t ₃ ＝……＝t _N-1 ＝t _N Of course (t) ₂ -t ₁ )＝(t ₃ -t ₂ )＝……＝(t _N-1 -t _N-2 )＝(t _N -t _N-1 ) At 0, obviously 0 cannot be denominator, and thus forward velocity and acceleration cannot be calculated. When a reverse detector with N laser beams is present, the N, … …, i +1, i-1, … …, 2, 1 (the number from back to front is 1, 2, … …, i-1, i +1, … …, N) laser beams are sequentially and physically blocked when a person moves forward, and t is _N ≠……≠t _i+1 ≠t _i ≠t _i-1 ≠……≠t ₂ ≠t ₁ But t is _N 、……、t _i+1 、t _i 、t _i-1 、……、t ₂ 、t ₁ Are difficult to measure accurately. As mentioned above, after a laser beam in CN212623139U is reflected back and forth many times, the vibration and the offset are greatly amplified. Theoretically, the vibration and deflection of the 1 st laser beam are minimal and the vibration and deflection of the nth laser beam are maximal. Thus, in theory, t ₁ 、t ₂ 、……、t _i-1 、t _i 、t _i+1 、……、t _N The error of (2) is incremental. By the ith laser beam, the vibration and offset may be intolerably large and often go undetected, for example. Thus t _N 、……、t _i+1 、t _i 、t _i-1 、……、t ₂ 、t ₁ It can only be used marginally to calculate the speed, which after all is also the first derivative of time. But further calculation of the acceleration is virtually impossible because the acceleration is the second derivative of time. And it is theoretically impossible to calculate the forward velocity and acceleration without a reverse detection device.

Empirically, when the average time interval T ≧ (0.8T/d) during which some consecutive adjacent laser beams are physically occluded in turn and then restored in turn, it can be determined with a confidence probability P (T) close to 100%. Here, T does not necessarily have to be from 1 stThe average time interval from each beam, but from the position i ≧ 1, when the consecutive adjacent laser beams are sequentially physically blocked and then sequentially restored. If the measured time points of i, i +1, … …, xi-1 and xi continuous adjacent laser beams which are sequentially and physically shielded and then sequentially restored are respectively t _i 、t _i+1 、……、t _ξ-1 、t _ξ Then, the average time interval T ═ T [ [ (T) _i+1 -t _i )+……+(t _ξ -t _ξ-1 )]/( _ξ -i). Where ξ ≦ N is a random variable. Empirically, i is 1, but ξ<N is preferred. The factor 0.8 and the proximity to 100% here will vary for different specific applications. Empirically, it can also be determined that trailing occurs with a confidence probability P (τ) close to 100% when some consecutive adjacent laser beams are sequentially recovered and then physically occluded for an average time interval τ ≦ (0.2 t/d). Here, τ is not necessarily the average time interval from the 1 st beam, but the average time interval from the position i ≧ 1 at which successively adjacent laser beams are successively restored and then physically blocked again. If the measured time points of i, i +1, … …, xi-1 and xi continuous adjacent laser beams are respectively tau _i 、τ _i+1 、……、τ _ξ-1 、τ _ξ Then, the average time interval τ ═ t [ (τ ═ t _i+1 -τ _i )+……+(τ _ξ -τ _ξ-1 )]/(ξ -i). Where ξ ≦ N is a random variable. Empirically, i is 1, but ξ<N is preferred. The coefficient 0.2 and the proximity to 100% here will also vary for different specific applications.

When the reverse detection component is available, according to experience, when the average time interval T ' ≧ 0.8T '/d is obtained when some continuous adjacent laser beams are sequentially and physically shielded and then sequentially restored, the trailing can be assisted and judged to occur with the confidence probability P (T ') close to 100%. T' here is not necessarily the average time interval from the backward to forward 1 st beam, but from the backward to forward position j ≧ 1 successive adjacent laser beams are physically blocked in turn and then restored in turn. If the measured j, j +1, … …, zeta-1, zeta adjacent laser beams are physically blocked and then restored sequentiallyRespectively at times t _j '、t _j ' ₊₁ 、……、t' _ζ-1 、t' _ζ If the average time interval T' is equal to [ (T) _j ' ₊₁ -t _j ')+……+(t' _ζ -t' _ζ-1 )]/(. zeta.j). Zeta ≦ N here is also a random variable. Empirically, j>1, but ζ.ltoreq.N is preferred. The coefficient 0.8 and the degree of approaching 100% here will vary for different specific applications. Empirically, the determination that trailing has occurred can also be aided with a confidence probability P (T ') close to 100% when some consecutive adjacent laser beams are sequentially recovered and then physically occluded for an average time interval τ ' ≦ (0.2T '/d). Here, τ' is not necessarily the average time interval from the backward to the forward 1 st beam, but from the backward to forward position j ≧ 1 when consecutive adjacent laser beams are sequentially restored and then sequentially physically blocked. Tau 'is measured when j, j +1, … …, zeta-1 and zeta continuous adjacent laser beams are restored in sequence and then are shielded physically in sequence' _j 、τ _j ' ₊₁ 、……、τ' _ζ-1 、τ' _ζ Then, the average time interval τ 'is [ (τ' _j+1 -τ' _j )+……+(τ' _ζ -τ' _ζ-1 )]/(. zeta.i). Where ζ ≦ N is a random variable. Empirically, j>However, it is preferable that ζ is not more than N. The coefficient 0.2 and the proximity to 100% here will also vary for different specific applications.

When the person or goods moves at a constant speed, the relation between T and P (T) can be set to a desired value mu _T Is simulated by the inverse normal distribution of the signal,

since T is more than or equal to mu _T So that it is a right one-sided inverse bell-shaped distribution, where the parameter σ _T 、μ _T It needs to be estimated experimentally. Of course, it is generally impossible for people or goods to move at a constant speed, and thus the right single-sided inverted bell-shaped distribution is distorted. But the more T deviates from mu _T The closer the confidence probability P (T) is to 1, the closer T is to mu _T The property that the confidence probability p (t) approaches 0 does not change; the relationship between τ and P (τ) may be expected to be μ _τ Is of inverse normalThe distribution is simulated by the distribution model,

because tau is less than or equal to mu _τ So that it is a left-single-sided inverted bell-shaped distribution, where the parameter σ _τ 、μ _τ It needs to be estimated experimentally. Of course, it is generally not possible for people or goods to move at a constant speed, and thus the left single-sided inverted bell-shaped distribution may be distorted. But the more τ deviates from μ _τ The closer the confidence probability P (τ) is to 1, the closer τ is to μ _τ The characteristic that the confidence probability P (τ) approaches 0 does not change; when there is a reverse direction detection component, the relationship between T 'and P (T') can also be expected to be μ 'when the person or cargo is moving at a constant velocity' _T Simulated by an inverse normal distribution of P (T ') ≈ 1-exp [ - (T ' - μ ' _T ) ² /(2(σ' _T ) ² )]T 'is more than or equal to mu' _T This is thus also a right-single-sided inverted bell-shaped distribution, here parameter σ' _T 、μ' _T And also needs to be estimated experimentally. Of course, it is generally impossible for people or goods to move at a constant speed, and therefore the right single-sided inverted bell-shaped distribution is also distorted. However, the farther away T 'is from mu' _T The closer the confidence probability P (T ') is to 1, the closer mu' T 'is to' _T The more the confidence probability P (T') approaches 0, the less the characteristic will be changed; the relationship between τ 'and P (τ') may also be μ 'with an expected value' _τ Simulated by a reciprocal normal distribution of P (τ ') ≈ 1-exp [ - (τ ' - μ ' _τ ) ² /(2(σ' _τ ) ² ]Tau 'is less than or equal to mu' _τ So is a left-single-sided inverted bell-shaped distribution, here parameter σ' _τ 、μ' _τ It also needs to be estimated experimentally. Of course, it is generally impossible for people or goods to move at a constant speed, and thus this left single-sided inverted bell-shaped distribution may be distorted. However, the more τ 'deviates from μ' _τ The closer the confidence probability P (τ ') is to 1, the closer τ ' is to μ ' _τ The more the confidence probability P (τ') approaches 0, the less the characteristic will be changed;

according to the approximate mathematical model, the moving speed and the moving acceleration in a certain direction can be accurately calculated, and the method can be favorable for preventing trailing and rushing. For example, a first person is a legal passenger, a second person is not, and the second person is far (>1 m) from the first person, which is not determined to be trailing by the current infrared sensor or the several-person face recognition module. However, if the first person trails in coordination with the second person, the first person and the second person are in synchronous forward rush once the first person swipes the door open. The now open gate has not yet reached closure and the second person has run the way to the first person. Because the second person steps a few large steps, it may take only 0.2 seconds to travel this distance of more than a meter. Within this very short 0.2 seconds, existing gates cannot open quickly and then close immediately. But the technical scheme of this application can more accurately calculate the speed and the acceleration of moving in certain direction. When a sudden acceleration is detected and accelerated to a higher speed, the controller controls the gate to close early and thus still come into play. However, the existing gate cannot start the process of closing the gate in advance because the speed and the acceleration are difficult to judge.

In practical application, a person skilled in the art can set multiple sets of forward detection assemblies according to actual requirements, and each set of forward detection assemblies is set in sequence. According to the requirements of practical application scenarios, such as subway stations, high-speed railway stations, etc., a channel of about 0.5 m is usually set, and 6-8 sets of forward detection assemblies are considered to be set within the channel range.

Considering the 8 bits of a byte of the computer, in one embodiment, n is set to 8, that is, each set of forward detection components includes 8 laser generators and corresponding 8 photosensitive detection components, which are convenient for the computer to read and store.

It should be noted that the heights of the laser generator and the photosensitive detection assembly referred to in this application can be set according to actual conditions; for example, considering the problem of carrying luggage by people, the laser generator and the photosensitive detection assembly in each group of forward detection assemblies can be arranged at different heights, for example, a group of forward detection assemblies can be respectively arranged at 11 heights of 20cm, 30cm, 40cm, 50cm, 60cm, 70cm, 80cm, 90cm, 100cm, 110cm and 120cm according to the actual situation, the actual passing situation of people is judged according to the comprehensive detection result of each group of forward detection assemblies, and the specific situation is not listed in the embodiment one by one.

EXAMPLE III

Based on the channel detection device of the first embodiment, the second embodiment provides a personnel channel device with universality, and is different from the first embodiment in that the personnel channel device comprises a reverse detection component besides a forward detection component; the weight of the laser signals emitted by the n laser generators in the reverse detection assembly is reduced in sequence.

In one embodiment, the forward detection component and the reverse detection component each comprise a group, and the actual person passing condition is determined according to the combined detection result of the forward detection component and the reverse detection component. As shown in fig. 3, to distinguish the laser generator and the photosensitive detection assembly included in the forward detection assembly and the reverse detection assembly, black and white patterns are respectively shown, wherein the black pattern belongs to the forward detection assembly, and the white pattern belongs to the reverse detection assembly. The components contained in the forward detection assembly and the reverse detection assembly are arranged in a cross manner.

The weights of the laser signals sent by the n laser generators in the forward detection assembly are sequentially reduced along the forward direction, and the weights of the laser signals sent by the n laser generators in the reverse detection assembly are sequentially reduced along the reverse direction.

The installation heights of the forward detection assembly and the reverse detection assembly can be set at 120cm and 60cm respectively.

In one embodiment, each of the forward detection components and the reverse detection components comprises a plurality of groups, and the actual personnel passing condition is determined according to the comprehensive detection result of all the forward detection components and the reverse detection components. Under the condition of a plurality of groups of forward detection components and reverse detection components, a weighted voting principle can be adopted; for example, considering the problem of carrying luggage by people, the laser generators and photosensitive detection assemblies in each set of forward detection assemblies and reverse detection assemblies can be set at different heights, for example, according to the actual situation, a set of forward detection assemblies or reverse detection assemblies can be respectively installed at 11 heights of 20cm, 30cm, 40cm, 50cm, 60cm, 70cm, 80cm, 90cm, 100cm, 110cm and 120cm, and if the forward laser beam set and the reverse laser beam set at 6 heights in the 11 heights consider that trailing occurs, the trailing can be really occurred with a high confidence probability according to the voting principle. If a forward laser beam group and a reverse laser beam group at 7 heights are deemed to be trailing, then it can be reliably trailing with a higher probability, and so on. If the forward and reverse laser beam groups at all elevations are deemed to be trailing, then there is essentially a very high probability that trailing is actually occurring.

The weights of the forward direction detection component and/or the reverse direction detection component provided at different heights can be set to be different. For example, in a specific application scenario, it is found that the weights of 5 heights of 70cm, 80cm, 90cm, 100cm and 110cm should be relatively large, and the weight of the height of 100cm should be the largest through actual measurement. Therefore, if the detection modules at 6 heights of 20cm, 30cm, 40cm, 50cm, 60cm, and 120cm determine that no tailing has occurred, the detection modules at 5 heights of 70cm, 80cm, 90cm, 100cm, and 110cm determine that tailing has occurred. Because the sum of the weights of the 5 heights 70cm, 80cm, 90cm, 100cm and 110cm is greater than the sum of the weights of the 6 heights 20cm, 30cm, 40cm, 50cm, 60cm and 120 cm.

Based on the actual application scenario, the personnel access device provided by the application may further be provided with a card swiping device, a face recognition device and/or a display screen.

Example four

Based on the channel detection device of the first embodiment, the first embodiment provides a cargo detection channel device, which includes the above channel detection device, a conveying device and a counter, wherein a laser emission module and a corresponding laser receiving module in the channel detection device are respectively arranged on two sides of the conveying device; the counter is connected with the controller of the channel detection device; the controller determines whether the goods pass through one piece or not according to the detection result of the forward detection assembly and/or the reverse detection assembly, and the counter is used for counting the number of the goods passing through one piece.

The specific detection principle can refer to a personnel channel detection device, and various parameter settings can be adaptively changed, such as specific setting height, the number setting of a forward detection device and a reverse detection component and the like.

The application provides a detection device has following advantage:

1. the application does not adopt the scheme that a laser beam is reflected back and forth to form a laser light curtain, but adopts a plurality of laser beams, avoids the difficult problems of high-efficiency reflection and light sensitivity,

2. the obvious amplification of the deflection and vibration after multiple reflections is avoided. Therefore, the method is beneficial to the accurate, reliable and continuous alignment of the laser beam to the photosensitive device.

3. Every 8 laser beams are in a group and correspond to 8 bits of one byte, so that the laser beams can be conveniently and quickly input into a computer and can be integrated with the computer.

4. Whether each laser signal is "occluded" is determined by both its own physical occlusion and its logical weight. An "occlusion" here is not necessarily a physical true occlusion, but a logical occlusion.

5. The light scattering film or glue not only protects the photosensitive device, but also scatters the received laser, can increase the photosensitive area by several orders of magnitude, and is further favorable for the laser beam to be accurate, reliable and continuously aligned with the photosensitive device; meanwhile, the laser intensity is reduced by several orders of magnitude, and the service life of the photosensitive device is prolonged.

6. The high directionality and the high brightness of the laser are utilized, and the flow production line, the logistics conveyor belt and the material conveyor belt can be accurately detected at a long distance. Especially for severe production environments such as high temperature, strong corrosion, strong vibration and the like, common infrared or photoelectric detection devices must be far apart. But far away, the light spot will be too large and the light intensity will become too small to be detected.

7. The technical scheme of the laser light curtain in the prior art CN21263139U can only calculate the speed and can not calculate the acceleration. But the laser light curtain technical scheme of this patent not only can calculate speed, can also calculate acceleration to under the application scene of subway or high-speed railway, if find someone maliciously to trail, can close the floodgate door in advance.

8. For detection components of different heights, the simple voting principle is not used, but the weighted voting principle is used. That is, in voting, the discrimination results of the detection components at some heights are weighted more heavily, while the discrimination results at other heights are weighted less heavily.

Some steps in the embodiments of the present invention may be implemented by software, and the corresponding software program may be stored in a readable storage medium, such as an optical disc or a hard disk.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (13)

1. A channel detection apparatus, the apparatus comprising: a controller and one or more sets of forward direction detection assemblies; each group of forward detection assemblies comprises a laser emitting module and a corresponding laser receiving module; the laser emission module in each group of forward detection assemblies comprises n laser generators, the corresponding laser receiving module comprises n photosensitive detection assemblies, and n is more than or equal to 3; the controller sets the weight of laser signals sent by the laser generators to be reduced in sequence according to the arrangement sequence of the n laser generators;

the photosensitive detection assembly comprises a photosensitive detection device and a light scattering device arranged on the photosensitive detection device, the area of the light scattering device is far larger than that of a photosensitive area of the photosensitive detection device, and the photosensitive detection device can detect laser signals when the light scattering device receives the laser signals at any position.

2. The apparatus of claim 1, further comprising: each group of reverse detection assemblies comprises a laser emitting module and a corresponding laser receiving module; the weight sequence of the laser signals emitted by the laser generator in the reverse detection assembly is opposite to the weight sequence of the laser signals emitted by the laser generator in the forward detection assembly.

3. The apparatus of claim 1, wherein n-8.

4. The device of claim 1, wherein the light scattering means is a light scattering film or a light scattering glue.

5. The apparatus of claim 1, wherein the controller determines the generated signal according to whether each photosensitive detecting element in the laser receiving module receives the corresponding laser signal and the weight of the corresponding laser signal.

6. A people walkway installation comprising the walkway inspection equipment of claim 1 and a physical barrier, the walkway inspection equipment being disposed forwardly of the physical barrier in the direction of the walkway; and a controller in the channel detection device controls the opening and closing of the entity block piece according to the detection result of the forward detection assembly.

7. The people passageway device according to claim 6, wherein when the people passageway device comprises a plurality of groups of forward detection assemblies, the controller determines to control the opening and closing of the entity barrier according to the comprehensive detection result of the plurality of groups of forward detection assemblies.

8. People walkway installation according to claim 7, wherein the sets of forward inspection assemblies are provided at different heights, with different weights being provided between the sets of forward inspection assemblies.

9. People walkway installation, comprising a walkway detection installation as claimed in any of claims 2 to 5 and a solid barrier, the walkway detection installation being disposed forwardly of the solid barrier in the direction of the walkway; and a controller in the channel detection device controls the opening and closing of the entity barrier according to the detection results of the forward detection assembly and the reverse detection assembly or according to the detection result of the reverse detection assembly.

10. The people passageway device according to claim 9, wherein when the people passageway device comprises a plurality of sets of forward detection components and/or reverse detection components, the controller determines to control the opening and closing of the entity barrier according to the comprehensive detection result of the plurality of sets of forward detection components and/or reverse detection components.

11. People walkway installation according to claim 10, wherein the sets of forward inspection assemblies and/or reverse inspection assemblies are provided at different heights, with different weights being provided between the sets of forward inspection assemblies and/or reverse inspection assemblies.

12. A cargo detection channel device, which is characterized by comprising the channel detection device, a conveying device and a counter of claim 1, wherein a laser emitting module and a corresponding laser receiving module in the channel detection device are respectively arranged at two sides of the conveying device; the counter is connected with the controller of the channel detection device; the controller determines whether the goods pass through one piece or not according to the detection result of the forward detection assembly, and the counter is used for counting the number of the goods passing through one piece.

13. A cargo detection channel device, which is characterized by comprising the channel detection device, a conveying device and a counter according to any one of claims 2 to 5, wherein a laser emitting module and a corresponding laser receiving module in the channel detection device are respectively arranged at two sides of the conveying device; the counter is connected with the controller of the channel detection device; the controller determines whether the goods pass through one piece or not according to the detection results of the forward detection assembly and the reverse detection assembly, or determines whether the goods pass through one piece or not according to the detection results of the reverse detection assembly, and the counter is used for counting the number of the goods passing through one piece.

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