A static human infrared recognition detector

Abstract

The present invention discloses a static human infrared recognition detector, comprising an infrared array sensor and a control unit, wherein the infrared array sensor and the control unit are connected to each other and transmit detection signals, wherein the detection angle of the infrared array sensor is set to a downward fan-shaped angle of 60°, and the detection distance is 8 meters. The present invention can effectively distinguish between human and non-human heat sources within a regional range through infrared array sensor technology to identify whether there is a person, and at the same time transmit a signal of whether there is a person or not to a controller through UART communication, and the controller switches the indicator light on and off when the relay is triggered, so as to reach a state of prompting whether there is a person.

Description

Technical Field

[0001] The invention relates to the field of detectors, and in particular to a static human infrared recognition detector. Background Art

[0002] At present, most of the human body recognition sensors on the market are human proximity sensors, which are based on the microwave Doppler principle, with a planar antenna as the sensing system and a microprocessor as the control sensor. Most of the human body proximity sensors transmit and receive at a microwave frequency of 10.525GHz. The key components of the whole machine are imported devices. The design and selection of devices ensure the reliability of the product. The sensor adopts non-contact detection, stable performance and long life. It is not affected by temperature, humidity, noise, airflow, dust, light, etc., and is suitable for harsh environments. It has strong anti-RF interference ability and strong penetration ability. However, the human body proximity sensor has strong penetration. When we check whether there is anyone in the area (such as a room), it may be mistakenly detected by someone outside the area due to the penetration. The human body can be detected in the form of microwave changes, but a stationary person cannot be detected.

[0003] In view of the above-mentioned defects, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Summary of the invention

[0004] In order to solve the above technical defects, the technical solution adopted by the present invention is to provide a static human infrared recognition detector, including an infrared array sensor and a control unit. The infrared array sensor and the control unit are connected to each other and transmit detection signals. The detection angle of the infrared array sensor is set to a downward fan-shaped 60° angle, and the detection distance is 8 meters; the infrared array sensor is provided with a first circuit board, the circuit board is provided with a power module, the power module is connected in series with the input end of the forward low-voltage regulator, and the output end of the forward low-voltage regulator is connected in parallel with multiple capacitor modules; the first circuit board is also provided with a first patch code switch, the first patch code switch is also connected to an infrared sensor, the infrared sensor includes a single-chip microcomputer chip, and the single-chip microcomputer chip is used to distinguish between human and non-human heat sources and convert the heat sources into regular values.

[0005] Preferably, the infrared sensor is an AMG8851 sensor.

[0006] Preferably, the first circuit board also includes an MCU processor, and the MCU processor converts the regular value transmitted by the single-chip microcomputer chip into a signal value.

[0007] Preferably, the infrared array sensor transmits the signal to the control unit via CSMA / CD at a rate of 10M / S.

[0008] Preferably, the control unit includes a telephone interface, and a power interface and a network interface are respectively provided on both sides of the telephone interface; the power interface is connected to an original power supply, a power indicator light and a first processor, the first processor is connected to an RS485 transceiver and a first relay and a second relay, the two ends of the first relay and the second relay are respectively connected to a detection indicator light, and the network interface is also connected to an Ethernet transceiver.

[0009] Preferably, the detection indicator light is connected to an original power supply, and the live wire of the power supply is divided into two sections, which are respectively connected in parallel to the two ends of the first relay and the second relay.

[0010] Preferably, the infrared array sensor is connected to the telephone interface.

[0011] Preferably, the network interface can also be connected to a switch to forward the signal to a local area network.

[0012] Preferably, when the signal received by the controller is a person signal, the relay performs a closing operation, the power supply of the indicator light is closed and the light is on; when the signal received by the controller is an person signal, the relay performs an opening operation, the power supply of the indicator light is disconnected and the light is off.

[0013] Preferably, when any signal received by the controller is inconsistent with a previous signal, the relay will switch at any time according to the signal, and the detection indicator light will also be switched in real time.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention has a simple structure, is easy to operate, and has a wide range of applications. 2. The present invention can identify stationary people in the area to prevent missed detection, so as to improve the recognition rate. 3. The present invention can also distinguish between human and non-human heat sources to prevent false detection, further improving the recognition rate and calibration rate. 4. The present invention can effectively distinguish between human and non-human heat sources within the area through infrared array sensor technology to identify whether there is someone. At the same time, it will transmit the signal of whether there is someone or not to the controller through UART communication. The controller triggers the relay to switch the indicator light on and off to indicate whether there is someone. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments.

[0016] Figure 1 It is a schematic diagram of the planing surface of the present invention;

[0017] Figure 2 The circuit in the sensor of the present invention Figure 1 ;

[0018] Figure 3 The circuit in the sensor of the present invention Figure 2 ;

[0019] Figure 4 It is the internal structure of AMG8851 in the sensor of the present invention;

[0020] Figure 5 It is a simplified structural diagram of the control unit in the present invention;

[0021] Figure 6 The control unit circuit of the present invention Figure 1 ;

[0022] Figure 7 The control unit circuit of the present invention Figure 2 ;

[0023] Figure 8 It is a work flow chart of the present invention;

[0024] The numbers in the figure represent:

[0025] 1. Infrared array sensor 2. Control unit 21. Power interface 22. Power indicator D1. Telephone interface D2. Network interface 23. First processor 24. RS485 transceiver 25. Ethernet transceiver J1. First relay J2. Second relay 26. Detection indicator 27. Second circuit board DETAILED DESCRIPTION

[0026] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0027] Example 1

[0028] like Figure 1 As shown, a static human infrared recognition detector includes an infrared array sensor 1 and a control unit 2; the infrared array sensor 1 and the control unit 2 are interconnected and transmit detection signals.

[0029] The infrared array sensor 1 is set downward at a 60-degree fan-shaped detection angle and a detection distance of 8 meters. It monitors the temperature changes in the area in real time. The infrared array sensor 1 uses the sensitivity of the far infrared range for human body detection. Infrared rays will not penetrate walls, so it can monitor the area and record the original data of the scene.

[0030] like Figure 2As shown in the circuit diagram, the infrared array sensor 1 is built with a first circuit board. The power module on the first circuit board is connected to a forward low-voltage regulator for controlling the internal integrated overheat protection and current limiting circuit. Multiple capacitor modules of different microfarads are connected in parallel between the power module and the forward low-voltage regulator to block direct current, store and release charges, and output pulsating signals smoothly. The output end of the forward low-voltage regulator is also connected in parallel with two capacitor modules C5 and C6 of different microfarads. The output end of the capacitor module c6 is also connected in parallel with three groups of inductors B1, B2, and B3. The three groups of inductors are connected in series with three groups of inductors to generate a resonant circuit. The model of the forward low-voltage regulator on the first circuit board is: AS1117-5.0

[0031] like Figure 3 As shown in the circuit diagram, the first circuit board is also connected to a first patch code switch SP1, and the first patch code switch SP1 is connected to an AMG8851 sensor, and some resistors, capacitors and inductors can be connected in series and parallel according to actual needs. Figure 4 As shown in the circuit diagram, the internal structure of AMG8851, the digital active thermopile array is composed of 64 sensor detection units (thermopiles), each detection unit detects the received infrared band energy and converts it into an electrical signal, which is converted into digital information after ADC conversion, and then written into the RAM in the sensor through digital filtering. Users can access the RAM and read the measurement results for temperature calculation through the I2C interface. The external microcontroller connected to the infrared sensor reads the RAM data at different addresses and refers to the calibration value of the EEPROM to compensate for the differences between different sensors to establish a thermal image and calculate the temperature of each point in the image. The built-in microcontroller chip has its own algorithm function, which can effectively distinguish between human and non-human (such as TV, table lamp, etc.) heat sources. The characteristic of the microcontroller chip filtering algorithm is that when measuring the same quantity under the same conditions, its size and sign change irregularly and cannot be predicted, but the results of multiple measurements conform to statistical laws. At the same time, considering the fast speed and large data volume of the AMG8851 sensor, good management is required when multiple sensors are spliced ​​for imaging. Therefore, a reliable data communication method is required in the application, and the use of Ethernet communication can ensure the communication quality.

[0032] The AMG8851 sensor used not only realizes the detection of static human body and moving direction that the previous pyroelectric sensor cannot detect, but also can measure the temperature distribution in the area. This sensor has an I2C digital output, which is easy to control by computer. The sensor can detect the temperature of the object from 0℃ to 80℃, and the storage temperature is -20℃ to 80℃.

[0033] The first circuit board is also connected to an MCU processor, which appropriately reduces the frequency and specifications of the central processor, and integrates peripheral interfaces such as memory, timer, USB, A / D conversion, UART, PLC, DMA, and even LCD drive circuits on a single chip to form a chip-level computer, which can perform different combination controls for different application scenarios.

[0034] The present invention adopts Ethernet network using CSMA / CD (Carrier Sense Multiple Access and Collision Detection) technology and runs on the telephone cable at a rate of 10M / S to transmit the signal to the control unit 2 through the cable transmission method.

[0035] like Figure 5 As shown, the control unit 2 includes a power interface 21, a power indicator light 22, a telephone interface D1, a network interface D2, a first processor 23, an RS485 transceiver 24, an Ethernet transceiver 25, a first relay J1, a second relay J2, and a detection indicator light 26. All electrical components are arranged on a second circuit board 27 and are interconnected.

[0036] The infrared array sensor 1 is connected to the control unit 2 through the telephone interface D1. In addition to transmitting signals, it also supplies power to the entire infrared identification detector system. A power interface 21 and a network interface D2 are respectively provided on both sides of the telephone interface D1. The power interface 21 can be connected to a 12V2A power supply and is connected to a power indicator light 22 for displaying the power switch. A first processor 23 is also connected to the telephone interface D1 for controlling the frequency of detection of the entire system and controlling external electrical components. The first processor 23 is connected to an RS485 transceiver 24 for converting the transmission signal TX from the first processor 23 into a differential signal in the communication network through a "transmitter", and can also convert the differential signal in the communication network into an RX signal received by the first processor 23 through a "receiver"; the outer side of the network interface D2 can be connected to a switch for Data transmission in the local area network; the network interface D2 can convert the signal transmitted by the infrared array sensor 1 into a 485 protocol and transmit it to the Internet; the network connection port 2 is also connected to an Ethernet transceiver 25, which sends or receives network signals through a network cable to transmit data; the first processor 23 is also connected to the first relay J1 and the second relay J2, and the opening and closing of the first relay J1 and the second relay J2 are controlled by the signal received by the first processor 23; the two ends of the first relay J1 and the second relay J2 are respectively connected to a detection indicator light 23, and the detection indicator light 23 is connected to a 12V2A power supply. The live wire of the power supply is separated into two sections, which are respectively connected in parallel to the two ends of the first relay J1 and the second relay J2. When the control unit 2 receives a signal from someone, the relay is in a closed state, otherwise it is open and closed.

[0037] In addition to the electrical components mentioned above, the control unit also includes some necessary circuit control components. The specific connection method is as shown in the attached Figure 6 ,7. The present invention can identify stationary people in the area, and can also distinguish between human and non-human heat sources, prevent missed detection and false detection, and further improve the recognition rate and calibration rate.

[0038] like Figure 8 As shown, the working principle of a static human infrared recognition detector is as follows:

[0039] 1. The infrared array sensor at the front end of the detector looks down at an angle of 60 degrees for real-time monitoring. The detection distance is 8 meters. When an object enters the area, the infrared array sensor will record the temperature and area of ​​the object, and upload this data to the single-chip microcomputer chip for algorithm processing.

[0040] 2. The infrared array sensor 1 transmits these data in real time, obtains the rules after calculation, and uploads the rule values ​​to the MCU processor.

[0041] 3. The MCU processor converts the regular value received into a signal value (to obtain a human / no human signal) and transmits the signal value through UART.

[0042] 4. The signal is transmitted to the control unit 2 via the telephone line.

[0043] 5. The control unit 2 mainly controls the frequency of real-time acquisition. At the same time, the built-in network interface can be introduced into the switch, and the signal can be forwarded to the local area network through the network cable; when the signal received by the controller is a signal of someone, the relay performs a closing operation, and the power supply of the detection indicator light is closed and the light is on. At the same time, when the signal is changed to an unmanned signal, the relay performs an opening operation, and the power supply of the detection indicator light is separated and the light is off. The signal received by the controller is real-time. When there is any inconsistency with the previous signal, the relay will switch at any time according to the signal (someone / no one), and the detection indicator light is also switched in real time (light is on for someone, and light is off for no one). The present invention can effectively distinguish between human and non-human heat sources within the regional range through infrared array sensor technology to identify whether there is someone, and at the same time, the signal of someone or no one will be transmitted to the controller through UART communication. The controller triggers the relay to switch the indicator light on and off to reach the state of prompting whether there is someone.

[0044] The above description is only a preferred embodiment of the present invention, which is only illustrative and not restrictive of the present invention. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims of the present invention, but all of them will fall within the scope of protection of the present invention.

Claims

1. A static human infrared recognition detector, comprising an infrared array sensor and a control unit, wherein the infrared array sensor and the control unit are interconnected and transmit detection signals, characterized in that: The infrared array sensor is set to a detection angle of 60° downward in a fan shape, and the detection distance is 8 meters; the infrared array sensor is provided with a first circuit board, the circuit board is provided with a power module, the power module is connected in series with the input end of the forward low voltage regulator, and the output end of the forward low voltage regulator is connected in parallel with a plurality of capacitor modules; the first circuit board is also provided with a first patch code switch, the first patch code switch is also connected with an infrared sensor, the infrared sensor includes a single-chip chip, and the single-chip chip is used to distinguish between human and non-human heat sources and convert the heat sources into regular values; the control unit includes a telephone interface, and a power interface and a network interface are respectively provided on both sides of the telephone interface; the power interface is connected to an original power supply, a power indicator light and a first processor, the first processor is connected to an RS485 transceiver and a first relay and a second relay, the two ends of the first relay and the second relay are respectively connected to a detection indicator light, and the network interface is also connected to an Ethernet transceiver; the detection indicator light is connected to the original power supply, and the live wire of the power supply is divided into two sections, which are respectively connected in parallel to the two ends of the first relay and the second relay.

2. The static human infrared recognition detector according to claim 1, characterized in that: The infrared sensor is an AMG8851 sensor.

3. The static human infrared recognition detector according to claim 2, characterized in that: The first circuit board also includes an MCU processor, and the MCU processor converts the regular value transmitted by the single-chip microcomputer chip into a signal value.

4. The static human infrared recognition detector according to claim 3, characterized in that: The infrared array sensor transmits the signal to the control unit via CSMA / CD at a rate of 10M / S.

5. The static human infrared recognition detector according to claim 1, characterized in that: The infrared array sensor is connected to the telephone interface.

6. The static human infrared recognition detector according to claim 5, characterized in that: The network interface can also be connected to a switch to forward the signal to the local area network.

7. The static human infrared recognition detector according to claim 6, characterized in that: When the signal received by the controller is a signal of someone, the relay performs a closing operation, and the power supply of the indicator light is closed and the light is on; when the signal received by the controller is a signal of no one, the relay performs an opening operation, and the power supply of the indicator light is disconnected and the light is off.

8. The static human infrared recognition detector according to claim 7, characterized in that: When any signal received by the controller is inconsistent with the previous signal, the relay will switch at any time according to the signal, and the detection indicator light will also be switched in real time.

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