Multi-channel photoelectrochemical sensing detection device based on LabVIEW

Abstract

The invention belongs to the field of advanced agricultural sensing, and particularly relates to a multi-channel photoelectrochemical sensing detection device based on LabVIEW. The device comprises a photoelectrochemical sensor, a lower computer and an upper computer, based on the photoelectrochemical sensor, the technical problem of false positive caused by extra voltage required to be applied to a traditional photoelectrochemical sensing system is solved, and high-sensitivity, high-specificity and trace detection is realized; meanwhile, the photoelectrochemical sensor adopts a multi-channel design, so that the problem that only a single pollutant can be detected is solved. The intelligent detection design with the single-chip microcomputer as the core solves the technical problems that a traditional work station is inconvenient to carry and the detection process is tedious. Wireless information transmission can be carried out for detection results, and the technical problem that the detection results can only be displayed through a display screen is solved; and the technical effects of data acquisition, processing and storage are realized in combination with a LabVIEW upper computer. And communication with equipment such as a smart phone and a computer through the Bluetooth module is also realized, and the application prospect is wide.

Description

Technical Field

[0001] The invention belongs to the field of advanced agricultural sensing, and in particular relates to a multi-channel photoelectric chemical sensing detection device based on LabVIEW. Background Art

[0002] Photoelectrochemistry (PEC) sensors detect targets based on the conversion between optical and electrical signals. Traditional PEC sensors usually require voltage to be applied. These detection technologies require a potentiostat or a constant current device to operate, which inevitably requires an additional power supply, leading to sensor complexity and false positive detection.

[0003] Moreover, the currently commonly used PEC detection device uses a xenon lamp light source as the excitation signal (light signal), and the electrochemical workstation collects the detection signal (photocurrent signal) to test the PEC sensor. The xenon lamp light source has high power and a strong output signal, but its components are complex, the power supply voltage is large, and it is not easy to carry, which limits the field application of PEC sensors. The electrochemical workstation has many detection methods and high detection accuracy, but its equipment is relatively large and not easy to carry. Therefore, the development of a portable PEC detection device is of great significance to the development of on-site analysis of PEC sensing methods.

[0004] The detection system of the portable photoelectrochemical sensing method consists of a portable PEC detection device and a PEC sensor. Existing literature reports the use of a commercial portable electrochemical workstation in conjunction with an LED light source to achieve on-site detection of PEC sensors. This method can broaden the application scenarios of the sensor to a certain extent, but requires operators to convert the collected photocurrent signal to obtain target concentration information and can only detect a single pollutant; at the same time, in the actual PEC detection process, manual operation is required to control the switch of the LED, making the testing process of the PEC sensor cumbersome.

[0005] In summary, the traditional PEC detection device relies on the synergy of the electrochemical workstation and the high-power light source. The relatively large electrochemical workstation and the complex light source components limit the field application of PEC sensors to a certain extent. By integrating and miniaturizing the excitation light source and the photocurrent test module, a multi-channel portable PEC detection device is developed, which, combined with the dual-photoelectrode photoelectrochemical sensor, has a certain role in promoting the field analysis application of the PEC sensing method. Summary of the invention

[0006] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a multi-channel photoelectrochemical sensing device based on LabVIEW to solve the problems raised in the background technology. The present invention provides a photoelectrochemical detection method of dual photoelectrodes, which solves the technical problem that the traditional photoelectrochemical sensing system needs to apply an additional voltage to bring about false positives, and achieves the technical effect of high sensitivity, high specificity, and trace detection of pollutants; the intelligent detection technology design with a single-chip microcomputer as the core solves the technical problem that the traditional workstation is not convenient to carry and the detection process is cumbersome, and achieves the technical effect of high measurement accuracy of the single-chip microcomputer, integrated light source control, and intelligent direct reading of the detection results; the design method of multi-channel simultaneous acquisition solves the technical problem that only a single pollutant can be detected; the design method of wireless information transmission of the detection results solves the technical problem that only a single display can be displayed, and the detection results can be obtained remotely through mobile phones, computers, and other devices through Bluetooth modules; the technical effect of combining the LabVIEW host computer to realize data acquisition, processing, and storage.

[0007] In order to achieve the above technical objectives, the present invention provides the following solutions:

[0008] A multi-channel photoelectrochemical sensing detection device based on LabVIEW, the multi-channel photoelectrochemical sensing detection device comprising a photoelectrochemical sensor, a lower computer and a host computer;

[0009] The photoelectrochemical sensor comprises N dual-photoelectrode photoelectrochemical sensors, where N is a positive integer; wherein the dual-photoelectrode photoelectrochemical sensor is composed of a photoanode and a photocathode, both of which are composed of photosensitive semiconductors; wherein the photoanode provides free electrons for the photocathode, which are used to amplify the photocathode sensing signal, and can effectively avoid false positives caused by externally applied voltage, and the photocathode as a sensing interface can effectively avoid interference from reducing substances; the dual-photoelectrode photoelectrochemical sensor does not require an external power supply, and can spontaneously realize the conversion of optical signals and electrical signals under visible light irradiation and realize trace pollutant detection;

[0010] The photoelectrochemical sensor is connected to a lower computer;

[0011] The lower computer is a control board, which includes a rectifier and voltage regulator circuit, an I / V conversion circuit, an amplifier circuit, a calibration circuit, an A / D conversion circuit and a single-chip microcomputer; one side of the input end of the rectifier and voltage regulator circuit is connected to the USB charging port; the output end of the rectifier and voltage regulator circuit is connected to the power supply end of the single-chip microcomputer; the output side of the A / D conversion circuit is connected to the I / O port of the single-chip microcomputer, the input side of the A / D conversion circuit is connected to the amplifier circuit and the calibration circuit, and the input side of the amplifier circuit is connected to the I / V conversion circuit; one side of the I / V conversion circuit is connected to the photoelectrochemical sensor; the serial port of the single-chip microcomputer is respectively connected to the display module, the Bluetooth module, the buzzer and the LED control circuit;

[0012] The lower computer is electrically connected to the upper computer so as to transmit data to the upper computer; the upper computer comprises a real-time data acquisition module and a real-time data processing module.

[0013] Preferably, the photoanode is an n-type semiconductor, and the photocathode is a p-type semiconductor; the photoanode and the photocathode are placed in the same electrolyte and connected externally via a wire to form a dual-photoelectrode photoelectrochemical sensor.

[0014] Preferably, the single-chip microcomputer is an STM32F103C8T6 single-chip microcomputer, the operational amplifier of the amplification circuit is a MAX4239, the A / D conversion circuit is an ADS1115 chip, and the calibration circuit is a TL431 chip; the display module is a 0.96-inch OLED display screen, and the Bluetooth module is ATK-MW579;

[0015] Preferably, the rectifier and voltage regulator circuit includes a CH340 chip and an AMS1117 chip, and the output of the rectifier and voltage regulator circuit includes two voltage levels of +5V and +3.3V; the rectifier and voltage regulator circuit provides a +5V stable voltage for the single-chip microcomputer;

[0016] Preferably, the data output end of the A / D conversion circuit is connected to the PA port of the single-chip microcomputer, the output end of the amplifier circuit is connected to the IN pin of the A / D conversion circuit, and the control end of the A / D conversion circuit is connected to the PB port of the single-chip microcomputer;

[0017] Preferably, the buzzer is connected to the PA8 pin of the single-chip microcomputer; the control board also includes an LED control circuit, wherein the LED control circuit is connected to the PB10 pin of the single-chip microcomputer and outputs PWM to drive the LED; the LED control circuit is used to control the timing of the LED light on and off;

[0018] Preferably, the photoelectric chemical sensor converts the optical signal into a current or voltage signal, which is then amplified by an operational amplifier circuit and converted into a digital signal by an A / D conversion module. 2 The single-chip microcomputer processes the signal in real time and displays the detection result on the display module. The display module and the single-chip microcomputer are connected via I 2 The single-chip microcomputer is connected via a USART serial communication line, and the detection result is sent to the mobile phone via Bluetooth communication; the single-chip microcomputer is connected to the host computer via a USB serial communication line, and the serial communication is used to transmit the data to the host computer.

[0019] Preferably, the real-time data acquisition module is used to realize multi-channel data acquisition of the external sensor platform;

[0020] Preferably, the real-time data processing module performs real-time analysis and processing on the data recorded by the real-time data acquisition and displays it in a waveform.

[0021] The present invention also provides a detection method of a multi-channel photoelectrochemical sensing detection device based on LabVIEW, comprising the following steps:

[0022] S1. Initialize the detection device:

[0023] (1) Start the lower computer, perform calibration test, and perform light source test;

[0024] (2) Start the computer and start the built-in LabVIEW program; restore the environment variables required by the detection system to the set initialization state;

[0025] (3) Configure the host computer parameters and check whether the communication between the upper and lower computers is normal;

[0026] S2. Photoelectrochemical sensor connection and detection:

[0027] (1) Connecting the photoelectrochemical sensor;

[0028] (2) Start the lower computer and start the test: the photoelectric chemical sensor converts the optical signal into an electrical signal;

[0029] S3, the lower computer processes and sends data:

[0030] (1) The lower computer amplifies and processes the electrical signal and performs A / D conversion;

[0031] (2) Data processing by the lower computer: The electrical signal enters the lower computer for processing;

[0032] (3) The OLED screen displays information such as pollutant concentration and determines whether an alarm is needed;

[0033] (4) The lower computer sends data to the upper computer;

[0034] S4. The host computer receives and stores data:

[0035] The upper computer receives the data transmitted by the lower computer; processes the data in real time and displays and stores the waveform.

[0036] The beneficial effects of the present invention are:

[0037] The present invention

[0038] 1. The present invention adopts a photoelectrochemical sensor with dual photoelectrodes to significantly amplify the detection signal and improve the sensitivity of the detection; the photoelectrochemical sensor used is composed of a dual photoelectrode photoelectrochemical sensor, and the photogenerated carriers of the chemical sensor with dual photoelectrodes can be excited at the same time, resulting in directional transfer of electrons, significantly amplifying the detection signal, and improving the sensitivity of the detection. At the same time, no external voltage is required, which can avoid interference with the detection signal and cause false positive problems. Combined with the use of STM32 single-chip microcomputer as the main control unit, it integrates a large capacity memory and rich and powerful hardware interface circuits, and has a very high performance-price ratio; the operational amplifier MAX4239 is very suitable for high-precision measurement scenarios with its advantages of high precision, low noise, high gain-bandwidth product, low power consumption and flexible packaging options; ADS1115 has four channels, high speed, high precision, low temperature drift, excellent long-term precision and repeatability, and low power consumption, which provides effective guarantee for current data acquisition; ATK-MW579 Bluetooth module can be connected to almost all kinds of single-chip microcomputer chips and complete wireless data transmission, with the characteristics of extremely low current consumption.

[0039] 2. The multi-channel photoelectrochemical sensor detection device system based on LabVIEW of the present invention has a friendly human-computer interaction interface, which can clearly and intuitively perform quick operations such as serial port settings and data storage without the need to input cumbersome communication protocol commands, greatly reducing the complexity of the overall operation.

[0040] 3. The present invention solves the technical problem of intelligent measurement and processing of multiple sensor signals; the virtual instrument test system based on LabVIEW programming can have the characteristics of high accuracy, good stability, high degree of automation, etc., and is suitable for long-term measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of the system structure of a multi-channel photoelectrochemical sensing detection device based on LabVIEW provided in an embodiment of the present invention;

[0042] Figure 2 A schematic diagram of a dual-photoelectrode photoelectrochemical sensor of a multi-channel photoelectrochemical sensing device based on LabVIEW provided in an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of a main control circuit of a single-chip microcomputer for detecting a multi-channel photoelectrochemical sensing device based on LabVIEW provided in an embodiment of the present invention;

[0044] Figure 4 A schematic diagram of a rectifying and voltage regulating circuit for a multi-channel photoelectrochemical sensing device based on LabVIEW provided in an embodiment of the present invention;

[0045] Figure 5A schematic diagram of an operational amplifier circuit for a multi-channel photoelectrochemical sensing device based on LabVIEW provided in an embodiment of the present invention;

[0046] Figure 6 A schematic diagram of a calibration circuit for a multi-channel photoelectrochemical sensing device based on LabVIEW provided in an embodiment of the present invention;

[0047] Figure 7 This is an overall schematic diagram of the lower computer of the multi-channel photoelectrochemical sensing detection device based on LabVIEW provided in an embodiment of the present invention.

[0048] Figure 8 A schematic diagram of the front panel of the host computer of the LabVIEW-based multi-channel photoelectrochemical sensing detection device provided in an embodiment of the present invention.

[0049] Explanation of the accompanying drawings: 1 is a photoelectrochemical sensor, 1-1 is a photoanode 1, 1-2 is a photocathode 1, 1-3 is a photoanode 2, 1-4 is a photocathode 2, 2 is an I / V conversion circuit, 3 is a calibration circuit, 4 is an amplifier circuit, 5 is an A / D conversion circuit, 6 is a display screen, 7 is a rectifier and voltage regulation circuit, 8 is a single-chip microcomputer, 9 is a buzzer, 10 is a power switch, 11 is a host computer, 12 is a USB interface, 13 is a Bluetooth module, and 14 is an LED. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention; obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The connections mentioned in the present invention include wired and wireless electrical connection methods, among which wired connections include wire connections, USB connections and the like; wireless includes Bluetooth connections and the like.

[0051] Embodiment 1:

[0052] like Figure 1 As shown, the present invention provides a multi-channel photoelectrochemical sensor detection device based on LabVIEW, which integrates the functions of data acquisition, data conversion, display, remote transmission, etc.; it includes a photoelectrochemical sensor 1, an I / V conversion circuit 2, a calibration circuit 3, an amplification circuit 4, an A / D conversion circuit 5, a display screen 6, a rectifier and voltage regulation circuit 7, a single-chip microcomputer 8, a buzzer 9, a power switch 10, a host computer 11, a USB interface 12, a Bluetooth module 13 and an LED 14;

[0053] The photoelectrochemical sensor 1 is composed of a dual-photoelectrode photoelectrochemical sensor, wherein the dual-photoelectrode photoelectrochemical sensor is composed of a photoanode and a photocathode, specifically, Bi2S3 / ZnIn2S4 is used as the photoanode, and BiOBr-AuNPs is used as the photocathode; wherein the photoanode provides free electrons for the photocathode to amplify the photocathode sensing signal, which can effectively avoid false positives caused by externally applied voltage, and the photocathode as a sensing interface can effectively avoid interference from reducing substances; the dual-photoelectrode photoelectrochemical sensor does not require an external power supply, and can spontaneously realize the conversion of optical signals and electrical signals under visible light irradiation and realize trace pollutant detection; the photoanode and the photocathode are placed in the same electrolyte, and are connected externally by wires to form a dual-photoelectrode photoelectrochemical sensor, such as Figure 2 shown.

[0054] The photoelectrochemical sensor 1 provided in this embodiment includes two dual-photoelectrode photoelectrochemical sensors, which are recorded as dual-photoelectrode photoelectrochemical sensor 1 and dual-photoelectrode photoelectrochemical sensor 2; wherein the dual-photoelectrode photoelectrochemical sensor 1 is composed of a photoanode 1-1 and a photocathode 1-2, and the dual-photoelectrode photoelectrochemical sensor 2 is composed of a photoanode 1-3 and a photocathode 1-4; the dual-photoelectrode photoelectrochemical sensor 1 and the dual-photoelectrode photoelectrochemical sensor 2 are externally connected to the I / V conversion circuit 2 through an alligator clip, and the current data is converted into voltage data, and the converted voltage signal is further amplified by the amplifier circuit 4; the analog signal is then converted into a digital signal by the A / D conversion circuit 5, and the data is then transmitted to the single-chip microcomputer; after the single-chip microcomputer 8 performs calculations inside, the data is displayed on the display screen 6, and the detection results are judged, and an early warning is issued through the buzzer 9; in addition, it can also be transmitted to mobile phones, computers and other devices for display through the Bluetooth module 13 to realize remote information transmission; the A / D conversion circuit 5 and the single-chip microcomputer 8 are connected through I 2 C connection; the input end of the rectifier and voltage regulator circuit 7 is connected to the USB interface 12, and the output end is connected to the amplifier circuit 4 and the single-chip microcomputer 8 at the same time; the STM32 single-chip microcomputer 8 is also connected to a power switch 10 and an LED 14; the single-chip microcomputer 8 is connected to the host computer 11 through a USB serial port communication line.

[0055] Figure 3 The schematic diagram of the core single-chip microcomputer 8 of the present invention is shown in FIG. 8 . The single-chip microcomputer 8 of the present invention is preferably a STM32F103C8T6 single-chip microcomputer, which integrates a large-capacity memory and rich and powerful hardware interface circuits, and has a very high performance-price ratio; Figure 4The rectifier and voltage regulator circuit of the present invention includes a CH340 chip and an AMS1117 chip. The output of the rectifier and voltage regulator circuit includes two voltage levels of +5V and +3.3V. The rectifier and voltage regulator circuit provides a +5V stable voltage for the single-chip microcomputer. The A / D conversion circuit 5 of the present invention is preferably ADS1115, which has the characteristics of four channels, high speed, high precision, low temperature drift, excellent long-term precision and repeatability, and low power consumption, and provides an effective guarantee for current data acquisition. Figure 5 The operational amplifier circuit 4 of the present invention is preferably a MAX4239 operational amplifier, which has the advantages of high precision, low noise, high gain-bandwidth product, low power consumption and flexible packaging options, and is very suitable for high-precision measurement scenarios. The present invention adopts a two-stage operational amplifier, which can achieve 100 times amplification of the voltage signal; the number of the photoelectric chemical sensor 1 of the present invention is preferably 2;

[0056] like Figure 6 As shown in FIG. 1 , it is a schematic diagram of the built-in calibration circuit of the present invention, which uses a TL431 chip to output a 2.5V reference voltage for correcting the detection accuracy of the lower computer; Figure 7 As shown, it is a schematic diagram of the overall 3D model of the lower computer of the present invention;

[0057] like Figure 8 As shown, it is a schematic diagram of the front panel of the host computer of the present invention, and the host computer 11 includes a real-time data acquisition module and a real-time data processing module; wherein the real-time data acquisition module is used to realize the data acquisition of the multi-channel capacitor of the external device; the real-time data processing module performs real-time analysis and processing on the data recorded by the real-time data acquisition; and displays the processed data in a visual manner on the screen of the host computer, and stores the data in the designated storage location of the host PC at the same time.

[0058] The detection method of the multi-channel photoelectrochemical sensing detection device based on LabVIEW includes the following steps:

[0059] S1. Initialize the lower computer:

[0060] S1.1. Turn on the lower computer and use the built-in TL431 calibration circuit to calibrate the accuracy of the lower computer; if the accuracy is insufficient, perform internal software calibration;

[0061] S1.2. Test the light source to see if it can be switched on and off for 10 seconds.

[0062] S2. Initialize the host computer:

[0063] S2.1. Turn on the computer and start the built-in LabVIEW program;

[0064] S2.2, configure the host computer parameters, configure the communication port and communication mode of the external measuring equipment;

[0065] In the communication interface configuration area on the front panel, configure the serial port communication of the host computer, select the communication interface of the corresponding device and configure its corresponding baud rate communication format. After the configuration is completed, the system will automatically update the set parameters and then establish serial port communication with the lower computer; perform test communication to confirm whether the communication data format complies with the agreed protocol. If there is a problem, re-test communication until it fully complies with the communication protocol;

[0066] S3. Photoelectrochemical sensor connection and detection:

[0067] S3.1, connect the photoelectrochemical sensor;

[0068] S3.2, start the lower computer and start the test;

[0069] Under visible light irradiation, the photoanode and photocathode are excited at the same time, and the photoelectrochemical sensor converts the optical signal into an electrical signal, which is then used to detect the concentration of pollutants and sent to the lower computer in the form of an electrical signal.

[0070] S4, lower computer processing and data transmission:

[0071] S4.1, data processing and display by the lower computer:

[0072] The lower computer amplifies the collected electrical signal and transmits the data to the single-chip microcomputer for processing after A / D conversion. The single-chip microcomputer reconverts the digital signal into an analog signal, substitutes the known linear equation of pollutant concentration and current signal, and determines whether the test result is within the normal range. If so, the OLED screen displays "normal". If not, it displays "exceeding the standard" and issues an early warning through the buzzer.

[0073] S4.2, the lower computer sends the processed data to the upper computer through serial communication;

[0074] S5. The host computer receives and stores data:

[0075] S5.1. The upper computer receives data from the lower computer:

[0076] First, determine whether the "Stop" button is pressed: if it is detected that the button is pressed, the data is immediately stored in the specified document, and the entire system is manually stopped after the storage is completed; if the button is not detected to be pressed, the real-time data generation module continues to execute; the button "Save Image" can be manually clicked to save the detection waveform image, and the graphic storage path is consistent with the data path;

[0077] Then, read the serial port data and time data: First, read the voltage value measured from ADS1115 from STM32F103C8T6 through USART serial port communication, then convert the floating point voltage value into a value with a specified width in scientific notation, and then convert the value with the specified width into a string format with a specified width;

[0078] S5.2 Real-time data processing:

[0079] First, it is determined whether there is a data element in the data queue. If there is no data element in the queue, the real-time data processing module enters a waiting state and continues to wait for the real-time data generation module to pass in data. If there is a data element, the nearest data element is popped out from the data queue, that is, the data binding string in the real-time data generation module, and then the popped-out element is processed.

[0080] Then, using the time sequence table as the X-axis data and the data sequence table as the Y-axis data, draw a visual chart of the corresponding channel and display it on the front panel; finally, after the drawing is completed, store the chart data in the corresponding text document, distinguish the channels by columns, and update the data in the data table.

[0081] Note: The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention; therefore, although this specification has described the present invention in detail with reference to the above embodiments, a person skilled in the art should understand that the present invention can still be modified or replaced by equivalents; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A multi-channel photoelectrochemical sensing detection device based on LabVIEW, characterized in that: The multi-channel photoelectrochemical sensing detection device comprises a photoelectrochemical sensor, a lower computer and an upper computer; The photoelectrochemical sensor comprises N dual-photoelectrode photoelectrochemical sensors, where N is a positive integer; The dual-photoelectrode photoelectrochemical sensor is composed of a photoanode and a photocathode, both of which are composed of photosensitive semiconductors. The photoanode provides free electrons for the photocathode to amplify the photocathode sensing signal, which can effectively avoid false positives caused by external voltage application. The photocathode, as a sensing interface, can effectively avoid interference from reducing substances. The dual-photoelectrode photoelectrochemical sensor does not require an external power supply and can spontaneously realize the conversion of optical signals and electrical signals under visible light irradiation and realize trace pollutant detection. The photoelectrochemical sensor is connected to a lower computer; The lower computer is a control board, which includes a rectifier and voltage regulator circuit, an I / V conversion circuit, an amplifier circuit, a calibration circuit, an A / D conversion circuit and a single-chip microcomputer; one side of the input end of the rectifier and voltage regulator circuit is connected to the USB charging port; the output end of the rectifier and voltage regulator circuit is connected to the power supply end of the single-chip microcomputer; the output side of the A / D conversion circuit is connected to the I / O port of the single-chip microcomputer, the input side of the A / D conversion circuit is connected to the amplifier circuit and the calibration circuit, and the input side of the amplifier circuit is connected to the I / V conversion circuit; one side of the I / V conversion circuit is connected to the photoelectrochemical sensor; the serial port of the single-chip microcomputer is respectively connected to the display module, the Bluetooth module, the buzzer and the LED control circuit; The lower computer is electrically connected to the upper computer so as to transmit data to the upper computer; the upper computer comprises a real-time data acquisition module and a real-time data processing module.

2. The multi-channel photoelectrochemical sensing detection device based on LabVIEW according to claim 1, characterized in that: The photoanode is an n-type semiconductor, and the photocathode is a p-type semiconductor; the photoanode and the photocathode are placed in the same electrolyte and connected externally through a wire to form a dual-photoelectrode photoelectrochemical sensor.

3. The multi-channel photoelectrochemical sensing detection device based on LabVIEW according to claim 1, characterized in that: The single chip microcomputer is an STM32F103C8T6 single chip microcomputer, the operational amplifier of the amplification circuit is a MAX4239, the A / D conversion circuit is an ADS1115 chip, and the calibration circuit is a TL431 chip; the display module is a 0.96-inch OLED display screen, and the Bluetooth module is an ATK-MW579.

4. The multi-channel photoelectrochemical sensing detection device based on LabVIEW according to claim 1, characterized in that: The rectifier and voltage regulator circuit includes a CH340 chip and an AMS1117 chip. The output of the rectifier and voltage regulator circuit includes two voltage levels: +5V and +3.3V. The rectifier and voltage regulator circuit provides a +5V stable voltage for the single-chip microcomputer.

5. The multi-channel photoelectrochemical sensing detection device based on LabVIEW according to claim 1, characterized in that: The data output end of the A / D conversion circuit is connected to the PA port of the single chip microcomputer, the output end of the amplifier circuit is connected to the IN pin of the A / D conversion circuit, and the control end of the A / D conversion circuit is connected to the PB port of the single chip microcomputer.

6. The multi-channel photoelectrochemical sensing detection device based on LabVIEW according to claim 1, characterized in that: The buzzer is connected to the PA8 pin of the single-chip microcomputer; the control board also includes an LED control circuit, wherein the LED control circuit is connected to the PB10 pin of the single-chip microcomputer and outputs PWM to drive the LED; the LED control circuit is used to control the timing of the LED light on and off.

7. The multi-channel photoelectrochemical sensing detection device based on LabVIEW according to claim 1, characterized in that: The photoelectric chemical sensor converts the light signal into a current and voltage signal, which is then amplified by the operational amplifier circuit and converted into a digital signal by the A / D conversion module. 2 The single-chip microcomputer processes the signal in real time and displays the detection result on the display module. The display module and the single-chip microcomputer are connected via I 2 The single-chip microcomputer is connected via a USART serial communication line, and the detection result is sent to the mobile phone via Bluetooth communication; the single-chip microcomputer is connected to the host computer via a USB serial communication line, and the serial communication is used to transmit the data to the host computer.

8. The multi-channel photoelectrochemical sensing detection device based on LabVIEW according to claim 1, characterized in that: The real-time data acquisition module is used to realize multi-channel data acquisition of the external sensor platform.

9. The multi-channel photoelectrochemical sensing detection device based on LabVIEW according to claim 1, characterized in that: The real-time data processing module performs real-time analysis and processing on the data recorded by the real-time data acquisition and displays the data in a waveform.

10. The detection method of the multi-channel photoelectrochemical sensing device based on LabVIEW is characterized in that: The steps include: S1. Initialize the detection device: (1) Start the lower computer, perform calibration test, and perform light source test; (2) Start the computer and start the built-in LabVIEW program; restore the environment variables required by the detection system to the set initialization state; (3) Configure the host computer parameters and check whether the communication between the upper and lower computers is normal; S2. Photoelectrochemical sensor connection and detection: (1) Connecting the photoelectrochemical sensor; (2) Start the lower computer and start the test: the photoelectric chemical sensor converts the optical signal into an electrical signal; S3, the lower computer processes and sends data: (1) The lower computer amplifies and processes the electrical signal and performs A / D conversion; (2) Data processing by the lower computer: The electrical signal enters the lower computer for processing; (3) The OLED screen displays information such as pollutant concentration and determines whether an alarm is needed; (4) The lower computer sends data to the upper computer; S4. The host computer receives and stores data: The upper computer receives the data transmitted by the lower computer; processes the data in real time and displays and stores the waveform.

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