Hydrogen concentration detection equipment based on metasurface optical chip

Abstract

The utility model provides hydrogen concentration detection equipment based on a metasurface optical chip, and belongs to the field of gas detection. Comprising an LED light source module, a metasurface optical chip, a photodiode module, a signal conditioning module and a power supply module for supplying power to each module, the metasurface optical chip receives light from the LED light source module and is connected with the photodiode module, and the photodiode module is connected with the signal conditioning module. According to the utility model, high-sensitivity and quick-response hydrogen detection can be realized by using the super-surface chip, the structure is simple, universal components are adopted, and the manufacturing cost can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of gas detection technology, specifically to a hydrogen concentration detection device based on a metasurface optical chip. Background Technology

[0002] Hydrogen can burn in air to produce water and heat, making it an important fuel widely used in industry, energy, and scientific research. For example, hydrogen can be used in fuel cell vehicles, hydrogen fuel cell power generation, and ammonia synthesis. Due to the flammable and explosive nature of hydrogen, rapid and accurate detection of hydrogen concentration is crucial for safe production. However, existing hydrogen detection circuits are typically complex and expensive, making it difficult to meet the demands for miniaturization and low cost. Furthermore, the sensitivity and response speed during detection are also difficult to guarantee. Utility Model Content

[0003] The technical problem to be solved by this invention is how to provide a low-cost hydrogen concentration detection device with high sensitivity and fast response.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a hydrogen concentration detection device based on a metasurface optical chip, characterized in that it includes an LED light source module, a metasurface optical chip, a photodiode module, a signal conditioning module, and a power supply module for supplying power to each module; the metasurface optical chip receives light from the LED light source module and is connected to the photodiode module, and the photodiode module is connected to the signal conditioning module.

[0005] This invention, when detecting hydrogen concentration, utilizes the principle that changes in hydrogen concentration lead to changes in the intensity of reflected or refracted light. It also leverages the unique structure and properties of the metasurface optical chip, which possesses extremely high reflectivity, refractive index, and transmittance. By receiving light emitted from an LED light source module using the metasurface optical chip, and then processing the absorbed light intensity through a photodiode module and a signal conditioning module, the resulting electrical signal, related to the light intensity, directly reflects the hydrogen concentration. This enables high sensitivity and rapid response in hydrogen concentration detection.

[0006] Preferably, the power module includes a low-dropout linear stabilizer H1 and a chip U1, with the output terminal of the low-dropout linear stabilizer H1 connected to the input terminal of the chip U1.

[0007] This invention utilizes a low-dropout linear stabilizer H1, which can maintain a stable voltage output in the circuit and maintain efficient operation even when the difference between the input voltage and the output voltage is small.

[0008] Preferably, the power module further includes capacitors C2 and C3, with one end of capacitors C2 and C3 connected in parallel to the output pin of chip U1 and the other end grounded.

[0009] This invention adds a filter capacitor to the power output terminal, which can reduce power supply noise.

[0010] Preferably, the LED light source module includes an LED driving circuit and a light-emitting circuit. The LED driving circuit includes a chip U2, and the light-emitting circuit includes a light-emitting diode LED1. The positive power input pin of the chip U2 is connected to the output pin of the chip U1. A control pin of the chip U2 is connected to the cathode of the light-emitting diode LED1, and the anode of the light-emitting diode LED1 is connected to the positive power input pin of the chip U2.

[0011] The LED driver circuit of this invention can ensure the stability and consistency of the light source.

[0012] Preferably, the photodiode module includes a photodiode PD1 and a resistor R2. The cathode of the photodiode PD1 is connected to the output pin of the chip U1, the anode of the photodiode PD1 is connected to one end of the resistor R2, and the other end of the resistor R2 is grounded.

[0013] Preferably, the photodiode module further includes capacitors C4 and C6. The capacitor C6 is connected in parallel across the resistor R2, one end of the capacitor C4 is connected to the cathode of the photodiode PD1, and the other end of the capacitor C4 is grounded.

[0014] Preferably, the signal conditioning module includes a reference voltage output circuit, first to third voltage followers, and a differential amplifier circuit. The first voltage follower is connected to the reference voltage output circuit and the differential amplifier circuit, the second voltage follower is connected to the photodiode module and the differential amplifier circuit, and the third voltage follower is connected to the differential amplifier circuit and an output voltage port.

[0015] Preferably, the reference voltage output circuit includes chip U3, resistors R5 and R6. The input pin of chip U3 is connected to the output pin of chip U1, the output pin of chip U3 is connected to one end of resistor R5, the other end of resistor R5 is connected to one end of resistor R6, and the other end of resistor R6 is grounded.

[0016] The reference voltage output circuit of this invention can improve measurement accuracy, provide a stable reference point for hydrogen detection, ensure the accuracy and consistency of measurement results, and enhance the stability of detection.

[0017] Preferably, the first voltage follower circuit includes an operational amplifier U4, the non-inverting input of which is connected to the end of the connection between resistors R5 and R6, and the output of which is connected to the inverting input. The second voltage follower includes an operational amplifier U7, the non-inverting input of which is connected to the end of the connection between resistor R2 and photodiode PD1, and the output of which is connected to the inverting input. The third voltage follower includes an operational amplifier U6, the non-inverting input of which is connected to the output of the differential amplifier circuit, and the output of which is connected to the inverting input.

[0018] The voltage follower circuit of this invention can increase the input impedance, thereby reducing the influence of external noise on the signal, improving anti-interference capability, and avoiding signal attenuation.

[0019] Preferably, the differential amplifier circuit includes an operational amplifier U5 and resistors R3, R4, R7, and R8. One end of resistor R4 is connected to the output terminal of operational amplifier U4, and the other end of resistor R4 is connected to the inverting input terminal of operational amplifier U5. The non-inverting input terminal of operational amplifier U5 is connected to one end of resistor R8, and the other end of resistor R8 is grounded. The non-inverting input terminal of operational amplifier U5 is also connected to one end of resistor R7, and the other end of resistor R7 is connected to the output terminal of operational amplifier U7. One end of resistor R3 is connected to the inverting input terminal of operational amplifier U5, and the other end of resistor R3 is connected to the output terminal of operational amplifier U5.

[0020] The differential amplifier circuit of this invention can suppress common-mode noise, improve signal integrity, and enhance signal fidelity, thereby improving the accuracy of hydrogen concentration detection.

[0021] Compared with the prior art, the advantages of this utility model are: it can utilize the special structure and properties of the metasurface of the metasurface optical chip, which has extremely high optical properties such as reflectivity, refractive index and transmittance, to further achieve high sensitivity and fast response when detecting hydrogen concentration. In addition, the circuit design of this utility model is simple, easy to implement and debug, and uses general-purpose components, which reduces manufacturing costs. Attached Figure Description

[0022] Figure 1 This is a structural block diagram of an embodiment of the present utility model;

[0023] Figure 2 This is a circuit diagram of the power module according to an embodiment of the present invention;

[0024] Figure 3 This is a circuit diagram of the LED light source module according to an embodiment of the present invention;

[0025] Figure 4This is a circuit diagram of the photodiode module according to an embodiment of the present invention;

[0026] Figure 5 This is a circuit diagram of the reference voltage output in the signal conditioning module of this utility model embodiment;

[0027] Figure 6 This is a circuit diagram of the voltage follower and differential amplifier in the signal conditioning module of this utility model embodiment. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0029] Example

[0030] like Figure 1 As shown, this embodiment provides a hydrogen concentration detection device based on a metasurface optical chip, including a power supply module, an LED light source module, a metasurface chip, a photodiode (PD) module, and a signal conditioning module. The power supply module supplies power to each module, the metasurface optical chip receives light from the LED light source module and is connected to the photodiode module, and the photodiode module is connected to the signal conditioning module.

[0031] like Figure 2 As shown, the power module includes a low-dropout linear stabilizer H1, a chip U1, and capacitors C1, C2, and C3. The output of the low-dropout linear stabilizer H1 is connected to the input terminal of the chip U1. The ground pin of the low-dropout linear stabilizer H1 is grounded. One end of capacitor C1 is connected to the output terminal of the low-dropout linear stabilizer H1, and the other end of capacitor C1 is grounded. In this embodiment, the chip U1 is model ME6212C50M5G. The CE pin of chip U1 is connected to the input terminal of U1, the VSS pin is grounded, and capacitors C2 and C3 are connected in parallel, with one end connected to the output terminal of chip U1 and the other end grounded.

[0032] The low-dropout linear stabilizer H1 included in this invention can provide a stable power supply and maintain a stable voltage output in the circuit, and can maintain efficient operation even when the difference between the input voltage and the output voltage is small.

[0033] like Figure 3As shown, the LED light source module includes an LED driving circuit and a light-emitting circuit. The LED driving circuit includes a chip U2, a capacitor C7, and a resistor R1. In this embodiment, the chip U2 is a CC1102. The VCC pin of chip U2 is connected to the output terminal of chip U1. One end of resistor R1 is connected to the VFB pin of chip U2, and the other end of resistor R1 is grounded. Capacitor C7 is connected in parallel across resistor R1. The GND pin of chip U2 is grounded. The LED driving circuit of this invention can ensure the stability and consistency of the light source.

[0034] The light-emitting circuit includes a light-emitting diode LED1 and a capacitor C5. The anode of LED1 is connected to the VCC pin of chip U2, and the pin of LED1 is connected to the DRV pin of chip U2. One end of capacitor C5 is connected to the anode of LED1, and the other end of capacitor C5 is grounded.

[0035] like Figure 4 As shown, the photodiode (PD) module is used to receive optical signals from the metasurface optical chip and output an electrical signal related to the light intensity. It includes a photodiode PD1, a resistor R2, and capacitors C4 and C6. The cathode of photodiode PD1 is connected to the output pin of chip U1, the anode of photodiode PD1 is connected to one end of resistor R2, and the other end of resistor R2 is grounded. One end of capacitor C4 is connected to the cathode of photodiode PD1, and the other end of capacitor C4 is grounded. Capacitor C6 is connected in parallel across resistor R2.

[0036] Combination Figure 5 and Figure 6 The signal conditioning module includes a reference voltage output circuit, first to third voltage followers, and a differential amplifier circuit.

[0037] like Figure 5 As shown, the reference voltage output circuit includes chip U3, resistors R5 and R6, and capacitor C9. In this embodiment, chip U3 is model REF3012AIDBZR. The input pin of chip U3 is connected to the output pin of chip U1. One end of resistor R5 is connected to the output pin of chip U3, and the other end of resistor R5 is connected to one end of resistor R6. The other end of resistor R6 is grounded. One end of capacitor C9 is connected to the output pin of chip U3, and the other end of capacitor C9 is grounded. The ground pin of chip U3 is grounded.

[0038] The reference voltage output circuit of this invention can improve measurement accuracy, provide a stable reference point for hydrogen detection, ensure the accuracy and consistency of measurement results, and improve the stability and accuracy of detection.

[0039] like Figure 6As shown, the first voltage follower includes an operational amplifier U4, the non-inverting input of which is connected to one end of the connection between resistors R5 and R6, and the output of which is connected to the inverting input. The second voltage follower includes an operational amplifier U7, the non-inverting input of which is connected to one end of the connection between photodiode PD1 and resistor R2 in the photodiode module, and the output of which is connected to the inverting output.

[0040] The differential amplifier circuit includes an operational amplifier U5, resistors R3, R4, R7, and R8, and capacitors C8 and C10. One end of resistor R4 is connected to the output terminal of operational amplifier U4, and the other end of resistor R4 is connected to the inverting input terminal of operational amplifier U5. One end of resistor R3 is connected to the inverting input terminal of operational amplifier U5, and the other end of resistor R3 is connected to the output terminal of operational amplifier U5. Capacitor C8 is connected in parallel across resistor R3. One end of resistor R7 is connected to the output terminal of operational amplifier U7, and the other end of resistor R7 is connected to the non-inverting input terminal of operational amplifier U5. The non-inverting input terminal of operational amplifier U5 is also connected to one end of resistor R8, and the other end of resistor R8 is grounded. One end of capacitor C10 is connected to the positive power supply input terminal of operational amplifier U5, the negative power supply input terminal of operational amplifier U5 is grounded, and the other end of capacitor C10 is grounded.

[0041] The differential amplifier circuit of this invention can suppress common-mode noise, improve signal integrity, enhance signal fidelity, and adaptively output signals to improve the accuracy of hydrogen concentration detection.

[0042] The third voltage follower includes operational amplifier U6. The non-inverting input of operational amplifier U6 is connected to the output of operational amplifier U5, and the output and inverting output of operational amplifier U6 are connected. The output of operational amplifier U6 is connected to an output voltage port H2 to output voltage. The formula for calculating the output voltage is: OUT = R3 / R4 * (PD_OUT - VREF1), where PD_OUT is the output of the photodiode module, and VREF1 is the output of the reference voltage output circuit.

[0043] The voltage follower of this invention can isolate the photodiode module and the differential amplifier circuit, improve the input impedance, thereby reducing the influence of external noise on the signal, improving anti-interference capability, and avoiding signal attenuation.

[0044] The working principle of this utility model is as follows: First, the power supply module provides a stable voltage to the circuits of each module. The LED driver circuit of the LED light source module drives the light-emitting circuit to emit light. A specific wavelength LED light source is selected to emit light onto the metasurface optical chip. When hydrogen reacts with the metasurface thin film material, it can change the reflection or transmission characteristics of light, thereby changing the light intensity. At this time, the photodiode module receives the light signal passing through the metasurface optical chip and outputs an electrical signal related to the light intensity. Subsequently, the circuits in the signal conditioning module process the weak signal output by the photodiode module, filter and amplify it, and output an analog voltage signal proportional to the hydrogen concentration.

[0045] The advantages of this invention lie in its ability to achieve high-precision and fast-response hydrogen detection using metasurface optical chips. It features a simple structure, concise circuit design, easy implementation and debugging, and low cost. The use of common components reduces manufacturing costs. Furthermore, it enables real-time detection: through signal conditioning, it outputs an analog signal proportional to hydrogen levels in real time. The hydrogen concentration detection device based on metasurface chips provided by this invention can be applied to hydrogen leak detection in industrial environments, hydrogen concentration detection in hydrogen fuel cell systems, hydrogen concentration monitoring in laboratories, and hydrogen alarms in energy storage systems.

[0046] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. Therefore, any equivalent changes made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A hydrogen concentration detection device based on a metasurface optical chip, characterized in that, It includes an LED light source module, a metasurface optical chip, a photodiode module, a signal conditioning module, and a power supply module that supplies power to each module; the metasurface optical chip receives light from the LED light source module and is connected to the photodiode module, and the photodiode module is connected to the signal conditioning module.

2. The hydrogen concentration detection device based on a metasurface optical chip according to claim 1, characterized in that, The power module includes a low-dropout linear stabilizer H1 and a chip U1, with the output of the low-dropout linear stabilizer H1 connected to the input of the chip U1.

3. The hydrogen concentration detection device based on a metasurface optical chip according to claim 2, characterized in that, The power module also includes capacitors C2 and C3. One end of capacitors C2 and C3 is connected in parallel to the output pin of chip U1, and the other end is grounded.

4. The hydrogen concentration detection device based on a metasurface optical chip according to claim 3, characterized in that, The LED light source module includes an LED driving circuit and a light-emitting circuit. The LED driving circuit includes a chip U2, and the light-emitting circuit includes a light-emitting diode LED1. The positive power input pin of the chip U2 is connected to the output pin of the chip U1. A control pin of the chip U2 is connected to the cathode of the light-emitting diode LED1, and the anode of the light-emitting diode LED1 is connected to the positive power input pin of the chip U2.

5. The hydrogen concentration detection device based on a metasurface optical chip according to claim 4, characterized in that, The photodiode module includes a photodiode PD1 and a resistor R2. The cathode of the photodiode PD1 is connected to the output pin of the chip U1, and the anode of the photodiode PD1 is connected to one end of the resistor R2, while the other end of the resistor R2 is grounded.

6. The hydrogen concentration detection device based on a metasurface optical chip according to claim 5, characterized in that, The photodiode module also includes capacitors C4 and C6. Capacitor C6 is connected in parallel across resistor R2, one end of capacitor C4 is connected to the cathode of photodiode PD1, and the other end of capacitor C4 is grounded.

7. The hydrogen concentration detection device based on a metasurface optical chip according to claim 1, characterized in that, The signal conditioning module includes a reference voltage output circuit, first to third voltage followers, and a differential amplifier circuit. The first voltage follower is connected to the reference voltage output circuit and the differential amplifier circuit. The second voltage follower is connected to the photodiode module and the differential amplifier circuit. The third voltage follower is connected to the differential amplifier circuit and an output voltage port.

8. The hydrogen concentration detection device based on a metasurface optical chip according to claim 7, characterized in that, The reference voltage output circuit includes chip U3, resistors R5 and R6. The input pin of chip U3 is connected to the output pin of chip U1. The output pin of chip U3 is connected to one end of resistor R5. The other end of resistor R5 is connected to one end of resistor R6. The other end of resistor R6 is grounded.

9. A hydrogen concentration detection device based on a metasurface optical chip according to claim 8, characterized in that, The first voltage follower circuit includes an operational amplifier U4, the non-inverting input of which is connected to the end of the circuit where resistors R5 and R6 are connected, and the output of which is connected to the inverting input. The second voltage follower includes an operational amplifier U7, the non-inverting input of which is connected to the end of the circuit where resistor R2 and photodiode PD1 are connected, and the output of which is connected to the inverting input. The third voltage follower includes an operational amplifier U6, the non-inverting input of which is connected to the output of the differential amplifier circuit, and the output of which is connected to the inverting input.

10. A hydrogen concentration detection device based on a metasurface optical chip according to claim 9, characterized in that, The differential amplifier circuit includes an operational amplifier U5 and resistors R3, R4, R7, and R8. One end of resistor R4 is connected to the output terminal of operational amplifier U4, and the other end of resistor R4 is connected to the inverting input terminal of operational amplifier U5. The non-inverting input terminal of operational amplifier U5 is connected to one end of resistor R8, and the other end of resistor R8 is grounded. The non-inverting input terminal of operational amplifier U5 is also connected to one end of resistor R7, and the other end of resistor R7 is connected to the output terminal of operational amplifier U7. One end of resistor R3 is connected to the inverting input terminal of operational amplifier U5, and the other end of resistor R3 is connected to the output terminal of operational amplifier U5.

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