A number-of-people detection sensor and a number-of-people detection method

Abstract

An embodiment of the present invention discloses a number detection sensor and a number detection method. The number detection sensor includes: a transmitting module, at least two receiving modules, and a central processing module; the transmitting module is configured to transmit a detection light wave and form a detection light wave emission area in space; the receiving module is configured to receive the detection light wave reflected by the person to be detected and form a detection light wave reception area in space; at least two receiving modules and the transmitting module are arranged in sequence on the same horizontal line, the detection light wave reception areas corresponding to at least two receiving modules do not overlap with each other, and the detection light wave emission area corresponding to the transmitting module covers the detection light wave reception areas corresponding to at least two receiving modules; the central processing module performs number statistics according to the positions of at least two receiving modules and the time sequence of the detection light wave feedback signals. The technical solution disclosed in the embodiment of the present invention can accurately and concisely count the number of people and the number of people flowing, and at the same time will not violate the personal privacy of the person to be detected.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of sensing detection, and in particular, to a number detection sensor and a number detection method. Background Art

[0002] With the booming development of the economy, it is necessary to count the number of people in some hotels, shopping malls, supermarkets, museums, exhibition halls, stations, docks, meeting rooms, banks, etc. Especially now, it is more and more convenient for people to check into hotels. Check-in registration and identity confirmation are no longer limited to the front desk. The future development trend is more towards self-registration through mobile phone APPs. Therefore, the detection of the number of people and the management of personnel safety are becoming increasingly important.

[0003] In the prior art, a camera is directly used to capture video images, and people are detected and managed through the video images; or, Figure 1 As shown in the schematic diagram of the pyroelectric technology principle in the prior art, Figure 1 as shown, when the flow of people is detected in the detection area, the infrared light released by the human body passes through the lens and is concentrated on a certain segment of the concentric ring in the long-distance area A or the medium-distance area B or the short-distance area C. By sending a signal pulse to the host computer, the number of people is counted; or the thermal imaging technology is used to capture the thermal imaging video pictures of people to achieve the purpose of monitoring and managing the number of people.

[0004] The methods of directly capturing video images by a camera and capturing thermal imaging video pictures of people by thermal imaging technology are only suitable for public places. For some private places, it will involve the problem of infringing on personal privacy, so the monitoring and management of people cannot be carried out; using the human pyroelectric technology, through the movement signal of people, although the problem of infringing on personal privacy of people can be avoided, the direction of people's movement cannot be distinguished. For the movement signals that repeatedly appear in the monitoring area, it is impossible to distinguish whether they are the same person, resulting in inaccurate personnel statistics. Summary of the Invention

[0005] Embodiments of the present invention provide a number detection sensor and a number detection method, aiming to conveniently and simply count the number of people and the number of people flowing under the premise of not infringing on the personal privacy of the detected people, and solve the problems in the prior art that the movement direction of the detected people cannot be identified and it is easy to infringe on the personal privacy of the detected people.

[0006] To achieve this purpose, in a first aspect, embodiments of the present invention provide a number detection sensor, which includes: a transmitting module, at least two receiving modules, and a central processing module;

[0007] The transmitting module is electrically connected to the central processing module. The transmitting module is configured to transmit a detection light wave and form a detection light wave emission area in space;

[0008] The at least two receiving modules are respectively electrically connected to the central processing module. The receiving module is configured to receive the detection light wave reflected by the person to be measured and form a detection light wave reception area in space;

[0009] The at least two receiving modules and the transmitting module are arranged in sequence on the same horizontal line. The detection light wave reception areas corresponding to the at least two receiving modules do not overlap with each other, and the detection light wave emission area corresponding to the transmitting module covers the detection light wave reception areas corresponding to the at least two receiving modules;

[0010] The central processing module is configured to send a detection light wave emission instruction to the transmitting module and receive the detection light wave feedback signals provided by the at least two receiving modules. The central processing module is further configured to perform a headcount according to the positions of the at least two receiving modules and the time sequence of the received detection light wave feedback signals.

[0011] Optionally, the transmitting module includes: a modulation signal processing unit, a driving unit, and a transmitting unit;

[0012] The modulation signal processing unit is electrically connected to the central processing module. The modulation signal processing unit is configured to perform modulation processing on the detection light wave emission instruction sent by the central processing module, generate a modulated emission signal, and send the modulated emission signal to the driving unit;

[0013] The driving unit is electrically connected to the modulation signal processing unit. The driving unit is configured to drive the transmitting unit to emit the detection light wave according to the modulated emission signal;

[0014] The transmitting unit is electrically connected to the driving unit. The transmitting unit is configured to emit the detection light wave.

[0015] Optionally, the receiving module includes: an amplification circuit and a receiving unit;

[0016] The receiving unit is electrically connected to the amplification circuit. The receiving unit is configured to receive the detection light wave reflected by the person to be measured;

[0017] The amplification circuit is also electrically connected to the central processing module. The amplification circuit is configured to perform amplification processing on the detection light wave received by the receiving unit, generate the detection light wave feedback signal, and transmit the detection light wave feedback signal to the central processing module.

[0018] Optionally, the amplifying circuit includes: an operational amplifying unit, a demodulating unit, and a digital control unit;

[0019] The operational amplifying unit is electrically connected to the receiving unit and is configured to amplify the detected light wave received by the receiving unit;

[0020] A first end of the demodulating unit is electrically connected to the operational amplifying unit, a second end of the demodulating unit is electrically connected to the digital control unit, and a third end of the demodulating unit is electrically connected to the central processing module. The demodulating unit is configured to analyze the detected light wave, generate a feedback signal of the detected light wave, and transmit the feedback signal of the detected light wave to the central processing module;

[0021] The digital control unit is electrically connected to the central processing module, and the digital control unit is configured to control the receiving module to be turned on or off.

[0022] Optionally, the receiving module further includes: a filtering unit and an oscillation unit;

[0023] A first end of the filtering unit is electrically connected to the operational amplifying unit, a second end of the filtering unit is electrically connected to the demodulating unit, and a third end of the filtering unit is electrically connected to the digital control unit. The filtering unit is configured to filter the detected light wave amplified by the operational amplifying unit;

[0024] The oscillation unit is electrically connected to the digital control unit and is configured to stabilize the amplifying circuit.

[0025] Optionally, the people detection sensor further includes: a voltage switch adjustment unit;

[0026] A first end of the voltage switch adjustment unit is electrically connected to the central processing module, a second end of the voltage switch adjustment unit is electrically connected to the digital control unit, and the voltage switch adjustment unit is configured to control the digital control unit to turn on or off each receiving module.

[0027] Optionally, the people detection sensor further includes an expansion unit;

[0028] The expansion unit is electrically connected to the central processing module and is configured to output the information processed by the central processing module to an external host computer.

[0029] Optionally, the people detection sensor further includes a power supply unit;

[0030] The power supply unit is electrically connected to the central processing module, the expansion unit, and the modulation signal processing unit, and is configured to provide a working voltage.

[0031] Optionally, the detection light wave is an infrared light signal, the transmitting unit is an infrared light-emitting diode, and the receiving unit is a photosensitive diode.

[0032] In a second aspect, an embodiment of the present invention further provides a method for detecting the number of people. The method for detecting the number of people is implemented by using the people number detection sensor described in the first aspect above, and includes:

[0033] Driving the transmitting module to emit a detection light wave;

[0034] Sequentially receiving detection light wave feedback signals provided by at least two receiving modules;

[0035] Counting the number of people according to the positions of the at least two receiving modules and the time sequence of the received detection light wave feedback signals.

[0036] Optionally, the counting the number of people according to the positions of the at least two receiving modules and the time sequence of the received detection light wave feedback signals includes:

[0037] When receiving the detection light wave feedback signals sent by at least two receiving modules, performing a counting increase or decrease operation;

[0038] When receiving the detection light wave feedback signals sent by at most one receiving module, keeping the count.

[0039] Optionally, the receiving module includes a first receiving module and a second receiving module. The first receiving module forms a first detection light wave feedback signal after receiving the detection light wave, and the second receiving module forms a second detection light wave feedback signal after receiving the detection light wave;

[0040] When receiving the detection light wave feedback signals sent by at least two receiving modules, performing a counting increase or decrease operation includes:

[0041] When sequentially receiving the first detection light wave feedback signal provided by the first receiving module and the second detection light wave feedback signal provided by the second receiving module, performing counting addition or subtraction according to the spatial positions of the first receiving module and the second receiving module.

[0042] A human number detection sensor and a human number detection method disclosed in an embodiment of the present invention control a transmitting module to emit a detection light wave through a central processing module, forming a detection light wave emission area in space. At least two receiving modules and the transmitting module are arranged in sequence on the same horizontal line, and the at least two receiving modules receive the detection light waves emitted by the detected personnel, forming a detection light wave reception area in space. The at least two receiving modules sequentially send the detection light wave feedback signals to the central processing module. Among them, by using the fact that the detection light wave reception areas corresponding to the at least two receiving modules do not overlap, and the detection light wave emission area corresponding to the transmitting module covers the detection light wave reception area, and using the positions of the at least two receiving modules and the time sequence of the received detection light wave feedback signals to count the number of people, it is possible to effectively identify the movement direction of the detected personnel in the number detection and the monitoring of the number of people flowing, improve the accuracy of the number detection and the number of people flowing, and at the same time, the detection light wave only reflects the personnel digital information and does not reflect the image information of the detected personnel, effectively protecting the personal privacy of the detected personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the pyroelectric technology principle in the prior art.

[0044] Figure 2 It is a schematic diagram of the infrared reflection technology principle provided by an embodiment of the present invention.

[0045] Figure 3 It is a schematic diagram of the structure of a human number detection sensor provided by an embodiment of the present invention.

[0046] Figure 4 It is a schematic diagram of the circuit structure of the transmitting module of a human number detection sensor provided by an embodiment of the present invention.

[0047] Figure 5 It is a schematic diagram of the circuit structure of the receiving module of a human number detection sensor provided by an embodiment of the present invention.

[0048] Figure 6 It is a schematic diagram of the circuit structure of the receiving module of another human number detection sensor provided by an embodiment of the present invention.

[0049] Figure 7 It is a schematic diagram of the circuit structure of a human number detection sensor provided by an embodiment of the present invention.

[0050] Figure 8 It is a flowchart of a human number detection method provided by an embodiment of the present invention.

[0051] Figure 9 It is a flowchart of another human number detection method provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] To make the technical problems solved by the embodiments of the present invention, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the content are shown in the drawings. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts.

[0053] Figure 2 Schematic diagram of the principle of the infrared reflection technology provided by the embodiments of the present invention. As Figure 2 shown, taking three reflection areas as an example, namely area A, area B, and area C, the detection sensor 1 emits detection light waves. When the person to be detected passes through area A, area B, and area C in sequence, the person to be detected will reflect the detection light waves back to the detection sensor 1 in sequence. The detection sensor 1 can determine the movement direction of the person to be detected according to the time sequence of the detection light waves reflected back in sequence and perform statistical calculation on the number of people to be detected.

[0054] Figure 3 Schematic diagram of the structure of a people detection sensor. Figure 3 As shown, by way of example, taking two receiving modules as an example, a people detection sensor 1 includes: a transmitting module 10, a first receiving module 11, a second receiving module 12, and a central processing module 13;

[0055] The transmitting module 10 is electrically connected to the central processing module 13. The transmitting module 10 is used to emit detection light waves and form a detection light wave emission area 100 in space;

[0056] The first receiving module 11 and the second receiving module 12 are respectively electrically connected to the central processing module 13. The first receiving module 11 is used to receive the detection light waves reflected by the person to be detected and form a first detection light wave receiving area 110 in space; the second receiving module 12 is used to receive the detection light waves reflected by the person to be detected and form a second detection light wave receiving area 120 in space;

[0057] The first receiving module 11, the second receiving module 12, and the transmitting module 10 are arranged in sequence on the same horizontal line. The first detection light wave receiving area 110 corresponding to the first receiving module 11 does not overlap with the second detection light wave receiving area 120 corresponding to the second receiving module 12. The detection light wave emission area 110 corresponding to the transmitting module 10 covers the first detection light wave receiving area 110 corresponding to the first receiving module 11 and the second detection light wave receiving area 120 corresponding to the second receiving module 12;

[0058] The central processing module 13 is used to send a detection light wave emission instruction to the emission module 10, and receive the detection light wave feedback signals provided by the first receiving module 11 and the second receiving module 12. The central processing module 13 is also used to perform a headcount according to the positions of the first receiving module 11 and the second receiving module 12, and the time sequence of the received detection light wave feedback signals.

[0059] The detection light wave emission area 100 refers to the propagation range in space where the emission module 10 emits the detection light wave; the first detection light wave receiving area 110 and the second detection light wave receiving area 120 refer to the propagation ranges in space where the receiving module receives the detection light wave reflected by the person to be detected; the detection light wave feedback signal refers to the signal obtained by amplifying and filtering the detection light wave after the receiving module receives the detection light wave reflected by the person to be detected. Among them, at least two receiving modules and the emission module 10 are arranged in sequence on the same horizontal line, the detection light wave receiving areas corresponding to at least two receiving modules are set not to overlap, and the detection light wave emission area 100 corresponding to the emission module 10 covers the detection light wave receiving areas. When the person to be detected passes through the detection light wave receiving areas corresponding to at least two receiving modules in sequence, at least two receiving modules receive the detection light wave reflected by the person to be detected in sequence, and transmit the detection light wave feedback signals to the central processing module 13 in sequence, so that the central processing module 13 can use the positions of at least two receiving modules and the time sequence of the received detection light wave feedback signals to count the number of people, and can effectively identify the movement direction of the detected person during the number detection and the monitoring of the personnel flow quantity. The counting method is simple and convenient, improving the counting efficiency. At the same time, in the form of the detection light wave feedback signal, the image information of the person to be detected is not reflected, effectively protecting the personal privacy of the person to be detected. It can be understood that the number of receiving modules is at least set to two, but not limited to two, but in space, it is required to be able to provide the detection light wave feedback signals to the central processing module in sequence in the direction of movement of the person to be detected.

[0060] Figure 4 FIG. is a schematic circuit diagram of the emission module of a headcount detection sensor provided by an embodiment of the present invention, as Figure 4 shown. Optionally, the emission module 10 includes: a modulation signal processing unit 101, a driving unit 102, and an emission unit 103;

[0061] The modulation signal processing unit 101 is electrically connected to the central processing module. The modulation signal processing unit 101 is used to perform modulation processing on the detection light wave emission instruction sent by the central processing module, generate a modulated emission signal, and send the modulated emission signal to the driving unit 102;

[0062] The driving unit 102 is electrically connected to the modulation signal processing unit 101. The driving unit 102 is configured to drive the transmitting unit 103 to emit a detection light wave according to the modulated transmission signal.

[0063] The transmitting unit 103 is electrically connected to the driving unit 102. The transmitting unit 103 is configured to emit a detection light wave.

[0064] The modulation signal processing unit 101 may be a modem, the driving unit 102 may be a transmitting tube driver, and the driving unit 103 may be a transmitting tube. Through the modulation signal processing unit 101, it is convenient for the wireless signal transmission, improves the communication capacity, and enhances the anti-interference ability. The driving unit 102 receives the modulated transmission signal of the modulation signal processing unit 101, thereby driving the transmitting unit 103 to emit a detection light wave. The control principle is simple, convenient, easy to control, and improves the operability.

[0065] Figure 5 FIG. is a schematic circuit diagram of a receiving module of a human number detection sensor provided by an embodiment of the present invention. As Figure 5 shown, optionally, the receiving module 20 includes: an amplifying circuit 201 and a receiving unit 202;

[0066] The receiving unit 201 is electrically connected to the amplifying circuit 202. The receiving unit 201 is configured to receive the detection light wave reflected by the person to be measured.

[0067] The amplifying circuit 202 is also electrically connected to the central processing module. The amplifying circuit 202 is configured to amplify and process the detection light wave received by the receiving unit 201, generate a detection light wave feedback signal, and transmit the detection light wave feedback signal to the central processing module.

[0068] The receiving unit 201 may be a photosensitive element. By receiving the detection light wave reflected by the person to be measured through the receiving unit 201, the signal of the person to be measured can be effectively captured, and the detection accuracy is improved. The captured signal of the person to be measured is amplified and processed by the amplifying circuit 202, and a detection light wave feedback signal is provided to the central processing module for processing, which improves the effectiveness of the detection light wave feedback signal, reduces the misjudgment probability of the central processing module, and enhances the detection accuracy of the overall detection sensor.

[0069] Continue to refer to Figure 5 Optionally, the amplifying circuit 201 includes: an operational amplifying unit 2011, a demodulating unit 2012, and a digital control unit 2013;

[0070] The operational amplifying unit 2011 is electrically connected to the receiving unit 202 and is configured to amplify the detection light wave received by the receiving unit 202.

[0071] The first end of the demodulation unit 2012 is electrically connected to the operational amplifier unit 2011, the second end of the demodulation unit 2012 is electrically connected to the digital control unit 2013, and the third end of the demodulation unit 2012 is electrically connected to the central processing module. The demodulation unit 2012 is configured to analyze the detected light wave, generate a detected light wave feedback signal, and transmit the detected light wave feedback signal to the central processing module;

[0072] The digital control unit 2013 is electrically connected to the central processing module, and the digital control unit 2013 is configured to control the receiving module to be turned on or off.

[0073] The operational amplifier unit 2011 may be an operational amplifier, the demodulation unit 2012 may be a demodulator, and the digital control unit 2013 may be an Automatic Gain Control (AGC for short). The detected light wave received by the receiving unit 202 is amplified by the operational amplifier unit 2011 to improve the accuracy of the detected light wave. The low-frequency digital signal modulated in the high-frequency digital signal is restored by the demodulation unit 2012 to improve the authenticity of the signal. When multiple receiving modules work simultaneously, a certain receiving module can be controlled to be turned on or off by the digital control unit 2013, reducing the processing data of the central processing module and shortening the processing time of the central processing module, thereby improving the working efficiency of the human detection sensor.

[0074] Figure 6 It is a schematic circuit diagram of the receiving module of another human detection sensor provided by an embodiment of the present invention. As Figure 6 shown, optionally, the receiving module further includes: a filtering unit 2014 and an oscillation unit 2015;

[0075] The first end of the filtering unit 2014 is electrically connected to the operational amplifier unit 2011, the second end of the filtering unit 2014 is electrically connected to the demodulation unit 2012, and the third end of the filtering unit 2014 is electrically connected to the digital control unit 2013. The filtering unit 2014 is configured to filter the detected light wave amplified by the operational amplifier unit 2011;

[0076] The oscillation unit 2015 is electrically connected to the digital control unit 20133 and is configured to stabilize the amplifier circuit.

[0077] The filtering unit 2014 may be an analog signal automatic control & filter, and the oscillation unit 2015 may be an oscillator. The signal processed by the operational amplifier unit 2011 is filtered by the filtering unit 2014, and the amplifier circuit 201 is stabilized by the oscillation unit 2015 to improve the accuracy of the signal.

[0078] Figure 7 It is a schematic circuit diagram of a human detection sensor provided by an embodiment of the present invention. As Figure 7As shown, by way of example, two receiving modules are taken as an example. Optionally, the number of people detection sensor 1 further includes: a voltage switch adjustment unit 14;

[0079] The first end of the voltage switch adjustment unit 14 is electrically connected to the central processing module 13, and the second end of the voltage switch adjustment unit 14 is respectively electrically connected to the first digital control unit 2113 and the second digital control unit 2213. The voltage switch adjustment unit 14 is used to control the first digital control unit 2113 to turn on or off the first receiving module 21, or control the second digital control unit 2213 to turn on or off the second receiving module 22.

[0080] The voltage adjustment unit 14 receives the control signal from the central processing module 13, transmits the control signal to the first digital control unit 2113 or the second digital control unit 2213 through the voltage adjustment unit 14, turns on or off the first receiving module 21 through the first digital control unit 2113, or turns on or off the second receiving module 22 through the second digital control unit 2213. Without affecting the detection of the number of people, a certain receiving module can be controlled to turn on or off at any time, effectively reducing power consumption and improving the service life of the device.

[0081] Continue to refer to Figure 7 Optionally, the number of people detection sensor 1 further includes an expansion unit 15;

[0082] The expansion unit 15 is electrically connected to the central processing module 13 and is used to output the information processed by the central processing module 13 to an external host computer (not shown in the figure).

[0083] Through the expansion unit 15, the data in the central processing module 13 can be transmitted to an external host computer, which is convenient for the operator to analyze and process the data, enriches the functions of the detection sensor, and improves the operator's use experience.

[0084] Optionally, the number of people detection sensor 1 further includes a power supply unit 16;

[0085] The power supply unit 16 is electrically connected to the central processing module 13, the expansion unit 15, and the modulation signal processing unit 101, and is used to provide a working voltage.

[0086] The power supply unit 16 provides electrical energy for the detection sensor. In the event of a sudden power outage, it ensures that the detection sensor can still work normally and improves the ability to handle emergencies.

[0087] Optionally, the detected light wave is an infrared light signal, the transmitting unit 103 is an infrared light-emitting diode, and the first receiving unit 202 and the second receiving unit 204 are photodiodes.

[0088] Using an infrared light signal as the detection light wave, the accuracy of the detection sensor is improved by the advantages of the infrared light signal, such as stability and strong anti-interference ability. An infrared light-emitting diode is used as the transmitting unit 103 to improve the anti-interference of the detection light wave, and a photosensitive diode is used as the receiving unit to ensure the sensitivity of the detection sensor and improve the detection accuracy.

[0089] Figure 8 The flowchart of a method for detecting the number of people provided by an embodiment of the present invention is as follows Figure 8 As shown, a method for detecting the number of people is implemented using the number-of-people detection sensor as described above, and includes:

[0090] S101. Drive the transmitting module to emit a detection light wave.

[0091] The central processing module drives the transmitting module to emit a detection light wave, realizing the control of the emission of the detection light wave, which is simple, convenient and easy to operate.

[0092] S102. Sequentially receive the detection light wave feedback signals provided by at least two receiving modules.

[0093] The detection light wave emitted by the person to be detected is received by the receiving module. After being processed by the receiving module, the central processing module sequentially receives the detection light wave feedback signals provided by each receiving module, ensuring that the detection light wave feedback signals received by the central processing module are true and effective, and improving the accuracy of the detection sensor.

[0094] S103. Count the number of people according to the positions of at least two receiving modules and the time sequence of the received detection light wave feedback signals.

[0095] The receiving module and the transmitting module are arranged in sequence on the same horizontal line. When the person to be detected triggers each receiving module in sequence, the central processing module determines the movement direction of the person to be detected according to the time sequence of the detection light wave feedback signals received by each receiving module, and can accurately identify whether the person to be detected enters or leaves, avoiding double counting of the number of people and reducing the probability of misjudgment, thus improving the accuracy of the detection sensor in detecting the number of people.

[0096] Figure 9 The flowchart of another method for detecting the number of people provided by an embodiment of the present invention is as follows Figure 9 As shown, optionally, a method for detecting the number of people includes:

[0097] S201. Drive the transmitting module to emit a detection light wave.

[0098] S202. Sequentially receive the detection light wave feedback signals provided by at least two receiving modules:

[0099] S203. When detecting light wave feedback signals sent by at least two receiving modules, perform counting increase or decrease operations;

[0100] S204. When detecting light wave feedback signals sent by at most one receiving module, keep the count.

[0101] Exemplarily, taking two receiving modules as an example, the first receiving module, the second receiving module and the transmitting module are arranged in sequence on the same horizontal line. Among them, the first receiving module forms a first detected light wave receiving area in space, and the second receiving module forms a second detected light wave receiving area in space. It is stipulated that the direction from the first detected light wave receiving area to the second detected light wave receiving area is the entering direction, and the direction from the second detected light wave receiving area to the first detected light wave receiving area is the leaving direction. The central processing module drives the transmitting module to emit detected light waves. When the person to be detected sequentially passes through the first detected light wave receiving area and the second detected light wave receiving area, the central processing module determines that the detection result is incremented by 1; when the person to be detected sequentially passes through the second detected light wave receiving area and the first detected light wave receiving area, the central processing module determines that the detection result is decremented by 1.

[0102] Based on the same principle, taking three receiving modules as an example, the three receiving modules are the first receiving module, the second receiving module and the third receiving module in sequence in the same direction. Among them, the first receiving module forms a first detected light wave receiving area in space, the second receiving module forms a second detected light wave receiving area in space, and the third receiving module forms a third detected light wave receiving area in space. It is stipulated that the direction from the first detected light wave receiving area to the third detected light wave receiving area is the entering direction, and the direction from the third detected light wave receiving area to the first detected light wave receiving area is the leaving direction. The central processing module drives the transmitting module to emit detected light waves. When the person to be detected sequentially passes through the first detected light wave receiving area, the second detected light wave receiving area and the third detected light wave receiving area, the central processing module determines that the detection result is incremented by 1; when the person to be detected sequentially passes through the third detected light wave receiving area, the second detected light wave receiving area and the first detected light wave receiving area, the central processing module determines that the detection result is decremented by 1; when the person to be detected passes through the first detected light wave receiving area and the second detected light wave receiving area and then passes through the first detected light wave receiving area again, or when the person to be detected passes through the third detected light wave receiving area and the second detected light wave receiving area and then passes through the third detected light wave receiving area again, the central processing module determines that the detection result is invalid and keeps the count. Through the above detection method, the movement direction of the person to be detected can be accurately judged, the accuracy of the detected number of people can be improved, and at the same time, by using the detected light wave method, the image information of the person to be detected will not be presented, effectively protecting the personal privacy of the person to be detected. It can be understood that the number of receiving modules can be two, three, etc., without limitation.

[0103] Note that the above is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments, combinations with each other and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, it may also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A number detection sensor, characterized in that, it includes: a transmitting module, at least two receiving modules and a central processing module; the transmitting module is electrically connected to the central processing module, and the transmitting module is used to emit a detection light wave and form a detection light wave emission area in space; the at least two receiving modules are respectively electrically connected to the central processing module, and the receiving module is used to receive the detection light wave reflected by the person to be detected and form a detection light wave reception area in space; the at least two receiving modules and the transmitting module are arranged in sequence on the same horizontal line, the detection light wave reception areas corresponding to the at least two receiving modules do not overlap with each other, and the detection light wave emission area corresponding to the transmitting module covers the detection light wave reception areas corresponding to the at least two receiving modules; the central processing module is used to send a detection light wave emission instruction to the transmitting module and receive the detection light wave feedback signals provided by the at least two receiving modules, and the central processing module is also used to perform number statistics according to the positions of the at least two receiving modules and the time sequence of the received detection light wave feedback signals; the detection light wave emission area corresponding to the transmitting module covers the detection light wave reception areas corresponding to the at least two receiving modules. When the person to be detected passes through the detection light wave reception areas corresponding to the at least two receiving modules in sequence, the at least two receiving modules sequentially receive the detection light wave reflected by the person to be detected and sequentially transmit the detection light wave feedback signals to the central processing module; the transmitting module includes: a modulation signal processing unit, a driving unit and a transmitting unit; the modulation signal processing unit is electrically connected to the central processing module, and the modulation signal processing unit is used to modulate the detection light wave emission instruction sent by the central processing module, generate a modulated emission signal, and send the modulated emission signal to the driving unit; the driving unit is electrically connected to the modulation signal processing unit, and the driving unit is used to drive the transmitting unit to emit the detection light wave according to the modulated emission signal; the transmitting unit is electrically connected to the driving unit, and the transmitting unit is used to emit the detection light wave; the receiving module includes: an amplifying circuit and a receiving unit; the receiving unit is electrically connected to the amplifying circuit, and the receiving unit is used to receive the detection light wave reflected by the person to be detected; the amplifying circuit is also electrically connected to the central processing module, and the amplifying circuit is used to amplify the detection light wave received by the receiving unit, generate the detection light wave feedback signal, and transmit the detection light wave feedback signal to the central processing module; the amplifying circuit includes: an operational amplifying unit, a demodulating unit and a digital control unit; the operational amplifying unit is electrically connected to the receiving unit and is used to amplify the detection light wave received by the receiving unit; The first end of the demodulation unit is electrically connected to the operational amplifier unit, the second end of the demodulation unit is electrically connected to the digital control unit, and the third end of the demodulation unit is electrically connected to the central processing module. The demodulation unit is configured to analyze the detected light wave, generate a feedback signal of the detected light wave, and transmit the feedback signal of the detected light wave to the central processing module; The digital control unit is electrically connected to the central processing module, and the digital control unit is configured to control the receiving module to be turned on or off; The receiving module further includes: a filtering unit and an oscillation unit; The first end of the filtering unit is electrically connected to the operational amplifier unit, the second end of the filtering unit is electrically connected to the demodulation unit, and the third end of the filtering unit is electrically connected to the digital control unit. The filtering unit is configured to filter the detected light wave amplified by the operational amplifier unit; The oscillation unit is electrically connected to the digital control unit and is used to stabilize the amplifier circuit; The number detection sensor further includes: a voltage switch adjustment unit; The first end of the voltage switch adjustment unit is electrically connected to the central processing module, and the second end of the voltage switch adjustment unit is electrically connected to the digital control unit. The voltage switch adjustment unit is configured to control the digital control unit to turn on or off each of the receiving modules.

2. The number detection sensor according to claim 1, wherein, the number detection sensor further includes an expansion unit; The expansion unit is electrically connected to the central processing module and is configured to output the information processed by the central processing module to an external host computer.

3. The number detection sensor according to claim 2, wherein, the number detection sensor further includes a power supply unit; The power supply unit is electrically connected to the central processing module, the expansion unit, and the modulation signal processing unit, and is configured to provide a working voltage.

4. The detection sensor according to claim 1, wherein, the detected light wave is an infrared light signal, the transmitting unit is an infrared light emitting diode, and the receiving unit is a photodiode.

5. A number detection method implemented by using the number detection sensor according to any one of claims 1-4, wherein, driving the transmitting module to emit a detected light wave; successively receiving feedback signals of the detected light wave provided by at least two receiving modules; counting the number of people according to the positions of the at least two receiving modules and the time sequence of the received feedback signals of the detected light wave.

6. The detection method according to claim 5, wherein, the counting the number of people according to the positions of the at least two receiving modules and the time sequence of the received feedback signals of the detected light wave includes: when receiving the feedback signals of the detected light wave sent by at least two receiving modules, performing a counting increase or decrease operation; when receiving the feedback signals of the detected light wave sent by at most one receiving module, keeping the count.

7. The detection method according to claim 6, wherein, The receiving module includes a first receiving module and a second receiving module. The first receiving module forms a first detected light wave feedback signal after receiving the detected light wave, and the second receiving module forms a second detected light wave feedback signal after receiving the detected light wave; When the detected light wave feedback signals sent by at least two receiving modules are received, a counting increase or decrease operation is performed, including: After sequentially receiving the first detected light wave feedback signal provided by the first receiving module and the second detected light wave feedback signal provided by the second receiving module, counting addition and subtraction are performed according to the spatial positions of the first receiving module and the second receiving module.

Images