Photoelectrochemical sensor detection terminal
Through integrated design and low-power technology, the problem of large size and high power consumption of traditional photoelectrochemical sensor detection terminals has been solved, realizing portable rapid detection and long battery life, which is suitable for scenarios such as environmental pollutant monitoring, food safety testing and clinical diagnosis.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAN RARE METAL MATERIALS RES INST CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-28
AI Technical Summary
Traditional three-electrode photoelectrochemical sensor detection terminals are bulky, power-consuming, and expensive, making it difficult to meet the needs of portable rapid detection.
The main controller, signal processing module and excitation light source module are highly integrated. The low-power STM32L series microcontroller and low-noise operational amplifier are used, combined with UV 365nm surface-mount LED beads for directional short-range illumination. The wireless Bluetooth communication module is integrated to simplify external wiring, reduce components, and adopt low-power power management.
Significantly reduces device size, improves photoelectric response efficiency, enables portable and rapid detection, reduces power consumption, supports long battery life, and is convenient for outdoor and laboratory use.
Smart Images
Figure CN224568963U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of electrochemical detection technology, and more specifically, to a photoelectrochemical sensor detection terminal. Background Technology
[0002] A three-electrode photoelectrochemical sensor detection terminal (electrochemical workstation) is a device that can be used for rapid on-site analysis of analyte concentrations. Its core principle is: by irradiating the reaction region of the sensor with excitation light, a photoelectrochemical reaction is triggered, and a microcurrent signal is output by the three-electrode system consisting of a working electrode, a reference electrode, and a counter electrode. The detection terminal acquires this signal and converts it into analyzable voltage data, ultimately obtaining the analyte concentration through data processing. This type of terminal has broad application prospects in fields such as environmental pollutant monitoring, food safety testing, and clinical diagnosis.
[0003] Currently, traditional electrochemical workstations are mainly designed for laboratory environments and suffer from problems such as large size, high power consumption, and high cost. Utility Model Content
[0004] This disclosure provides a photoelectrochemical sensor detection terminal, which is beneficial to improving the integration level and portability of the detection terminal.
[0005] This disclosure provides a photoelectrochemical sensor detection terminal, including:
[0006] Main controller;
[0007] The signal processing module includes an electrochemical simulation front-end chip, an operational amplifier buffer circuit, and a three-electrode sensor interface. The three-electrode sensor interface is used to connect the working electrode, reference electrode, and counter electrode of the sensor under test. The electrochemical simulation front-end chip is connected to the three-electrode sensor interface to receive sensor signals. The input terminal of the operational amplifier buffer circuit is used to receive the polarization voltage setting signal output by the main controller, and the output terminal of the operational amplifier buffer circuit is connected to the electrochemical simulation front-end chip to generate and apply an adjustable polarization voltage to the electrochemical simulation front-end chip.
[0008] The excitation light source module includes an excitation light source for emitting excitation light. After the sensor under test is connected to the three-electrode sensor interface, the excitation light source is located below the light-transmitting electrode sheet of the sensor under test and is vertically aligned with the reaction area of the sensor under test.
[0009] In one exemplary embodiment of this disclosure, the excitation light source is a UV 365nm surface-mount LED chip.
[0010] In one exemplary embodiment of this disclosure, after the sensor under test is connected to the three-electrode sensor interface, the vertical distance between the excitation light source and the reaction area of the sensor under test is less than 1 mm.
[0011] In one exemplary embodiment of this disclosure, the distance from the three-electrode sensor interface to the excitation light source is 25 to 30 mm.
[0012] In one exemplary embodiment of this disclosure, the photoelectrochemical sensor detection terminal includes a wireless Bluetooth communication module. The data terminal of the wireless Bluetooth communication module is connected to the main controller and is used to transmit the collected data to the host computer via Bluetooth.
[0013] In one exemplary embodiment of this disclosure, the main controller includes an analog-to-digital converter module and a digital-to-analog converter module; the input terminal of the analog-to-digital converter module is connected to the output terminal of the electrochemical simulation front-end chip; the output terminal of the digital-to-analog converter module is connected to the input terminal of the operational amplifier buffer circuit, and is used to output an adjustable polarization voltage to the operational amplifier buffer circuit, which is used to filter and amplify the adjustable polarization voltage signal.
[0014] In one exemplary embodiment of this disclosure, the excitation light source module includes a constant current driving circuit, the input terminal of which is connected to the analog-to-digital conversion module of the main controller; the output terminal of the constant current driving circuit is connected to the excitation light source.
[0015] In one exemplary embodiment of this disclosure, the photoelectrochemical sensor detection terminal includes a power module; the power module includes a battery cell, a power management circuit, and a voltage conversion control circuit; the power management circuit is used for charging management and overcharge / over-discharge protection of the battery cell; the output terminal of the voltage conversion control circuit is connected to the power input terminal of the main controller, the signal processing module, and the excitation light source module.
[0016] In one exemplary embodiment of this disclosure, the power management circuit monitors and controls power consumption through the analog-to-digital converter module of the main controller.
[0017] In one exemplary embodiment of this disclosure, the photoelectrochemical sensor detection terminal includes a human-machine interaction module, which includes physical buttons and indicator lights. The physical buttons are connected to the main controller and are used to trigger power on / off and mode switching. The indicator lights are connected to the main controller and are used to indicate the working status of the main controller through the color and / or flashing frequency of the indicator lights.
[0018] The photoelectrochemical sensor detection terminal disclosed herein highly integrates the main controller, signal processing module, and excitation light source module, avoiding the complex wiring and space occupation of external expansion components. The overall size is significantly reduced, allowing users to carry it in various environments such as outdoors, laboratories, and production workshops, meeting the needs for portable and rapid detection. Furthermore, the excitation light source is always perpendicularly aligned with the reaction area of the sensor under test, enabling directional short-distance illumination, improving photoelectric response efficiency, and avoiding ambient light interference.
[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description
[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.
[0021] Figure 1 This is a schematic diagram of the system structure of an exemplary embodiment of the photoelectrochemical sensor detection terminal disclosed herein.
[0022] Figure 2 This is a schematic diagram of the hardware layout of an exemplary embodiment of the photoelectrochemical sensor detection terminal disclosed herein.
[0023] Explanation of reference numerals in the attached figures:
[0024] 10. Main controller;
[0025] 20. Signal processing module; 21. Electrochemical simulation front-end chip; 22. Operational amplifier buffer circuit; 23. Three-electrode sensor interface;
[0026] 30. Excitation light source module; 31. Excitation light source; 32. Constant current drive circuit;
[0027] 41. Sensor under test; 51. Wireless Bluetooth communication module;
[0028] 60. Power module; 61. Physical buttons; 62. Indicator lights; 63. Type-C interface; 64. Battery unit; 65. Power circuit; 71. Circuit board. Detailed Implementation
[0029] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.
[0030] Unless otherwise specified or stated, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “a,” “an,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “comprising” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to those listed; the terms “first” and “second” are used only as illustrative marks and are not intended to limit the number, importance, or order of the objects.
[0031] Unless otherwise specified, the terms “connection” and “fixed” should be interpreted broadly. For example, “connection” can be a fixed connection, a movable connection, an integral connection, or a detachable connection. It can be a direct connection or an indirect connection through an intermediate medium.
[0032] Furthermore, in this application, directional terms such as "upper" and "lower" are used only to indicate relative positional relationships. For example, for convenience, they are defined based on the actual position and state of the photoelectrochemical sensor detection terminal during operation. It should be understood that these directional terms are relative concepts and can change accordingly depending on the orientation of the components in the accompanying drawings.
[0033] The core principle of the three-electrode photoelectrochemical sensor detection terminal (electrochemical workstation) is as follows: by irradiating the reaction area of the sensor with excitation light, a photoelectrochemical reaction is excited, and the three-electrode system consisting of a working electrode (WE), a reference electrode (RE), and a counter electrode (CE) outputs a microcurrent signal. The detection terminal collects this signal and converts it into analyzable voltage data. Finally, the concentration of the analyte is obtained through data processing. It is suitable for photoelectrochemical / biosensing and other related scenarios that require in-situ rapid detection.
[0034] This disclosure provides a photoelectrochemical sensor detection terminal, including:
[0035] Main controller 10;
[0036] The signal processing module 20 includes an electrochemical simulation front-end chip 21, an operational amplifier buffer circuit 22, and a three-electrode sensor interface 23. The three-electrode sensor interface 23 is used to connect the working electrode, reference electrode, and counter electrode of the sensor under test 41. The electrochemical simulation front-end chip 21 is connected to the three-electrode sensor interface 23 to receive sensor signals. The input terminal of the operational amplifier buffer circuit 22 is used to receive the polarization voltage setting signal output by the main controller 10, and the output terminal of the operational amplifier buffer circuit 22 is connected to the electrochemical simulation front-end chip 21 to generate and apply an adjustable polarization voltage to the electrochemical simulation front-end chip 21.
[0037] The excitation light source module 30 includes an excitation light source 31 for emitting excitation light. After the sensor under test 41 is connected to the three-electrode sensor interface 23, the excitation light source 31 is located below the light-transmitting electrode sheet of the sensor under test 41 and is vertically aligned with the reaction area of the sensor under test 41.
[0038] refer to Figure 1 as well as Figure 2 As shown, Figure 1 A schematic diagram of the system structure of a photoelectrochemical sensor detection terminal in an exemplary embodiment of this disclosure is shown. Figure 2 A schematic diagram of the hardware layout of a photoelectrochemical sensor detection terminal is shown in an exemplary embodiment.
[0039] First, a brief explanation of the working principle of the photoelectrochemical sensor detection terminal provided in this application is given: The reaction area of the photoelectrochemical sensor is coated with a photosensitive material, such as TiO2 nanoparticles. When it comes into contact with the analyte, a reaction occurs under the combined action of excitation light and polarization voltage, and a weak current is formed on the working electrode during the reaction.
[0040] The main controller 10 can generate a programmable analog voltage (polarization voltage setting signal) and output it to the operational amplifier buffer circuit 22. The operational amplifier buffer circuit 22 can filter, impedance isolate, and amplify the programmable analog voltage input to the main controller 10 to generate a pure voltage (adjustable polarization voltage) with high driving capability to the electrochemical analog front-end chip 21, for example, outputting it to the bias control terminal of the electrochemical analog front-end chip 21. The electrochemical analog front-end chip 21 is connected to the three-electrode sensor interface 23. The electrochemical analog front-end chip 21 applies the polarization voltage to the reference electrode to lock the potential difference between the working electrode and the reference electrode.
[0041] Excitation light source 31 is used to emit excitation light. After the sensor under test 41 is connected to the three-electrode sensor interface 23, the excitation light source 31 is located below the light-transmitting electrode of the sensor under test 41 and is perpendicularly aligned with the reaction area of the sensor under test 41. The excitation light emitted by the excitation light source 31 can penetrate the light-transmitting electrode of the sensor and excite the photosensitive material to generate electron-hole pairs. Under the drive of polarization voltage, electrons migrate to the working electrode, and holes participate in the oxidation reaction of the analyte, forming a detection current. The electrochemical simulation front-end chip 21 receives the current signal input from the sensor under test 41 and converts it into a voltage signal. The electrochemical simulation front-end chip 21 communicates with the main controller 10 through the IIC protocol. The main controller 10 can collect the output signal of the electrochemical simulation front-end chip 21 and send it to the main controller 10 for processing and calculation.
[0042] The photoelectrochemical sensor detection terminal disclosed herein highly integrates the main controller 10, signal processing module 20, and excitation light source module 30, avoiding the complex wiring and space occupation of external expansion components. The overall size is significantly reduced, allowing users to carry it in various environments such as outdoors, laboratories, and production workshops, meeting the needs for portable and rapid detection. Furthermore, the excitation light source 31 and the reaction area of the sensor under test 41 are always vertically aligned, enabling directional short-distance illumination, improving photoelectric response efficiency, and avoiding ambient light interference.
[0043] Specifically, the main controller 10 may include an analog-to-digital conversion (ADC) module and a digital-to-analog converter (DAC) module. For example, the main controller 10 may integrate a 12-bit ADC module and a DAC module. The output of the ADC module is connected to the input of the operational amplifier buffer circuit 22. The main controller 10 generates a programmable analog voltage through the ADC module and outputs it to the operational amplifier buffer circuit 22 through the DAC output pin. The operational amplifier buffer circuit 22 may use a low-noise operational amplifier to filter, impedance isolate, and amplify the output voltage of the ADC module in non-inverting mode, and then outputs a clean voltage with high drive capability to the electrochemical analog front-end chip 21. The input of the ADC module is connected to the output of the electrochemical analog front-end chip 21. The electrochemical analog front-end chip 21 converts the current signal into a voltage signal. The ADC module can acquire the amplified voltage signal from the electrochemical analog front-end chip 21 and reconstruct the current value through calculation.
[0044] In this exemplary embodiment, the analog signal output by the sensor under test 41 is converted into a digital signal by the analog-to-digital converter module built into the main controller 10. The digital-to-analog converter module generates a precise, programmable analog voltage (polarization voltage setting signal), thereby eliminating the need for a separate external chip, simplifying peripheral circuitry, reducing the number of components, and thus reducing the space occupied on the printed circuit board (PCB). This results in a more compact design, significantly reducing the overall size of the device and improving the integration and portability of the testing terminal.
[0045] For example, the main controller 10 can be a low-power STM32L series microcontroller, such as the STM32L151C8T6A MCU (microcontroller unit).
[0046] In one exemplary embodiment, the operational amplifier buffer circuit 22 can be a low-noise operational amplifier, such as the COS1333TRD. The electrochemical analog front-end chip 21 can be a programmable analog front-end (AFE) chip, such as the LMP91000. The conversion gain of the electrochemical analog front-end chip 21 is programmable, receives the precision polarization voltage provided by the operational amplifier buffer circuit 22, and controls the reference electrode position; while the main controller 10 can directly acquire the voltage signal amplified by the electrochemical analog front-end chip 21 and calculate the reduction current value. In this exemplary embodiment, by cooperating with the dedicated electrochemical analog front-end chip 21 and the analog-to-digital conversion module built into the main controller 10, high-precision detection can be achieved, and the signal-to-noise ratio is improved.
[0047] For example, the excitation light source 31 can be a UV 365nm surface-mount LED bead, which uses ultraviolet energy at this wavelength to promote the excitation of the sensor under test 41. In one embodiment, after the sensor under test 41 is connected to the three-electrode sensor interface 23, the vertical distance between the excitation light source 31 and the reaction area of the sensor under test 41 is less than 1mm, thereby achieving directional constant light intensity excitation of the reaction area of the sensor under test 41 and enhancing its photoelectric response effect.
[0048] In one exemplary embodiment of this disclosure, the distance from the three-electrode sensor interface 23 to the excitation light source 31 is 25 to 30 mm. It should be noted that the distance from the three-electrode sensor interface 23 to the excitation light source 31 described in this disclosure can refer to the distance from the edge of the electrode sheet of the sensor under test 41 protruding from the three-electrode sensor interface 23 to the center of the excitation light source 31, for example, the distance to the horizontal center of a surface-mount LED bead.
[0049] In one exemplary embodiment of this disclosure, the excitation light source module 30 includes a constant current driving circuit 32. The input terminal of the constant current driving circuit 32 is connected to the analog-to-digital conversion module of the main controller 10; the output terminal of the constant current driving circuit 32 is connected to the excitation light source 31. Specifically, the excitation light source 31 is driven by the constant current driving circuit 32, which can output a constant operating current to ensure that the light intensity emitted by the lamp beads of the excitation light source 31 remains constant, and the photoelectrochemical sensing reaction is stably excited. For example, the model of the constant current driving circuit 32 can be Hi1243.
[0050] In one exemplary embodiment of this disclosure, the photoelectrochemical sensor detection terminal includes a power module 60. The power module 60 may include a battery cell 64 and a power circuit 65. The power circuit 65 may include a power management circuit and a voltage conversion control circuit. The power management circuit is used for charging management and overcharge / over-discharge protection of the battery cell 64. The output terminal of the voltage conversion control circuit is connected to the power input terminals of the main controller 10, the signal processing module 20, and the excitation light source module 30.
[0051] For example, the battery unit 64 includes a 3.7V 2000mAh polymer lithium battery, which provides stable 3V and 5V power to various electrical components through a voltage conversion control circuit. In one exemplary embodiment of this disclosure, the power management circuit monitors and controls the power consumption through the analog-to-digital converter module of the main controller 10, realizing low-power, long-endurance management of the overall system, ensuring long-term portable use, continuous use in various environments, and device safety of the photoelectrochemical sensor detection terminal. In some embodiments of this disclosure, the system uses a low-power MCU and a high-efficiency power management chip, combined with a controllable excitation light source and power-optimized analog circuits, to achieve an ultra-low-power operation mode. The built-in lithium battery and charging control circuit can support long-term continuous detection, with a single charge providing up to tens of hours of battery life, thus meeting the needs of worry-free use in scenarios such as on-site monitoring and mobile inspection, while also taking into account the portability and ease of use of the device. The power module 60 may also include a Type-C interface 63 for convenient charging of the battery unit 64.
[0052] In some embodiments of this disclosure, relying on the integrated electrochemical simulation front-end chip 21 and the collaborative operation of the analog-to-digital conversion module and digital-to-analog conversion module within the main controller 10, the photoelectrochemical sensor detection terminal accurately amplifies and acquires the weak current signal output by the three-electrode photoelectrochemical sensor under test, with a detection limit as low as 0.01 μA. The precise alignment of the excitation light source 31 with the reaction region further suppresses interference, which is beneficial to improving the consistency of photoelectric excitation, thereby ensuring high repeatability and excellent stability of the detection results.
[0053] The photoelectrochemical sensor detection terminal may also include a wireless Bluetooth communication module 51. The data terminal of the wireless Bluetooth communication module 51 is connected to the main controller 10 and is used to transmit the collected data to the host computer via Bluetooth. For example, the wireless Bluetooth communication module is used to connect with the host computer's mobile APP via Bluetooth to realize wireless data transmission, user command reception, and sensor data uploading. For example, the wireless Bluetooth communication module 51 adopts wireless low-power transparent Bluetooth, and the model can be selected from CH9143-ABLE2U.
[0054] For example, in a detection terminal using the photoelectrochemical sensor disclosed herein, the user scans and connects to the detection terminal's Bluetooth signal via a mobile APP host computer, and sends relevant instructions to the wireless Bluetooth communication module 51. The wireless Bluetooth communication module 51 forwards the instructions to the main controller 10 via a serial port. The main controller 10 processes and parses the instructions, then configures the internally integrated digital-to-analog converter module to set the bias output. The output voltage is input to the electrochemical simulation front-end chip 21 after passing through the operational amplifier buffer circuit 22. At the same time, the main controller 10 reads and writes the configuration of its internal electrical characteristics via the IIC protocol. The electrochemical simulation front-end chip 21 detects the weak current of the sensor under test 41 through the three-electrode sensor interface 23 and amplifies and outputs it. Meanwhile, the main controller 10 collects the output signal of the electrochemical simulation front-end chip 21 through its internally integrated analog-to-digital converter module for processing and calculation. During this period, the current signal collected will change in real time according to the excitation control of the excitation light source 31. The main controller 10 sends the sensor data processed and calculated in real time to the wireless Bluetooth communication module 51 via a serial port and transmits it to the host computer for display.
[0055] In one exemplary embodiment of this disclosure, the photoelectrochemical sensor detection terminal includes a human-machine interface module, which includes a physical button 61 and an indicator light 62. The physical button is connected to the main controller 10 and is used to trigger power on / off and mode switching. The indicator light 62 is connected to the main controller 10 and is used to indicate the working status of the main controller 10 through the color and / or flashing frequency of the indicator light 62.
[0056] refer to Figure 2 As shown, circuit board 71 has circuit components corresponding to each module. The dimensions of circuit board 71 can be 79mm long * 40mm wide * 10mm high. In the figure, battery unit 64 can be located in the gray dashed area. Specifically, battery unit 64 can be located below circuit board 71, and placed horizontally and in close contact with the lower plane of circuit board 71.
[0057] The main controller 10 is positioned close to the center of the circuit board 71, while the type-c interface 63, physical buttons 61, and indicator lights 62 can be positioned close to the side edge of the circuit board 71 for easy operation.
[0058] The excitation light source module is located on one side of the circuit board 71, which facilitates the insertion of the electrode plates of the sensor under test 41. For example, the distance between the three-electrode sensor interface 23 and the side of the circuit board 71 can be designed according to the length of the electrode plates, thereby ensuring that the electrode plates can be smoothly inserted into the three-electrode sensor interface 23 and that the reaction area is perpendicularly aligned with the excitation light source 31.
[0059] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.
Claims
1. A photoelectrochemical sensor detection terminal, characterized in that, include: Main controller (10); The signal processing module (20) includes an electrochemical simulation front-end chip (21), an operational amplifier buffer circuit (22), and a three-electrode sensor interface (23). The three-electrode sensor interface (23) is used to connect the working electrode, reference electrode, and counter electrode of the sensor under test (41). The electrochemical simulation front-end chip (21) is connected to the three-electrode sensor interface (23) to receive sensor signals. The input terminal of the operational amplifier buffer circuit (22) is used to receive the polarization voltage setting signal output by the main controller (10). The output terminal of the operational amplifier buffer circuit (22) is connected to the electrochemical simulation front-end chip (21) to generate and apply an adjustable polarization voltage to the electrochemical simulation front-end chip (21). The excitation light source module (30) includes an excitation light source (31) for emitting excitation light. After the sensor under test (41) is connected to the three-electrode sensor interface (23), the excitation light source (31) is located below the light-transmitting electrode sheet of the sensor under test (41) and is vertically aligned with the reaction area of the sensor under test (41).
2. The photoelectrochemical sensor detection terminal according to claim 1, characterized in that, The excitation light source (31) is a UV 365nm surface-mount LED.
3. The photoelectrochemical sensor detection terminal according to claim 1, characterized in that, After the sensor under test (41) is connected to the three-electrode sensor interface (23), the vertical distance between the excitation light source (31) and the reaction area of the sensor under test (41) is less than 1 mm.
4. The photoelectrochemical sensor detection terminal according to claim 1, characterized in that, The distance from the three-electrode sensor interface (23) to the excitation light source (31) is 25 to 30 mm.
5. The photoelectrochemical sensor detection terminal according to claim 1, characterized in that, The photoelectrochemical sensor detection terminal includes a wireless Bluetooth communication module (51), the data end of which is connected to the main controller (10) and is used to transmit the collected data to the host computer via Bluetooth.
6. The photoelectrochemical sensor detection terminal according to any one of claims 1 to 5, characterized in that, The main controller (10) includes an analog-to-digital converter module and a digital-to-analog converter module; the input terminal of the analog-to-digital converter module is connected to the output terminal of the electrochemical simulation front-end chip (21); the output terminal of the digital-to-analog converter module is connected to the input terminal of the operational amplifier buffer circuit (22) and is used to output an adjustable polarization voltage to the operational amplifier buffer circuit (22), and the operational amplifier buffer circuit (22) is used to filter and amplify the adjustable polarization voltage signal.
7. The photoelectrochemical sensor detection terminal according to claim 6, characterized in that, The excitation light source module (30) includes a constant current driving circuit (32), the input terminal of which is connected to the analog-to-digital conversion module of the main controller (10); the output terminal of which is connected to the excitation light source (31).
8. The photoelectrochemical sensor detection terminal according to claim 6, characterized in that, The photoelectrochemical sensor detection terminal includes a power module (60); the power module (60) includes a battery unit (64), a power management circuit and a voltage conversion control circuit; the power management circuit is used for charging management and overcharge / over-discharge protection of the battery unit (64); the output terminal of the voltage conversion control circuit is connected to the power input terminal of the main controller (10), the signal processing module (20) and the excitation light source module (30).
9. The photoelectrochemical sensor detection terminal according to claim 8, characterized in that, The power management circuit monitors and controls power consumption through the analog-to-digital conversion module of the main controller (10).
10. The photoelectrochemical sensor detection terminal according to claim 1, characterized in that, The photoelectrochemical sensor detection terminal includes a human-machine interaction module, which includes a physical button (61) and an indicator light (62). The physical button is connected to the main controller (10) and is used to trigger power on / off and mode switching. The indicator light (62) is connected to the main controller (10) and is used to indicate the working status of the main controller (10) through the color and / or flashing frequency of the indicator light (62).