CN-224231610-U - Hydrogen concentration detection equipment based on super-surface optical chip

CN224231610UCN 224231610 UCN224231610 UCN 224231610UCN-224231610-U

Abstract

The utility model provides hydrogen concentration detection equipment based on a super-surface optical chip, and belongs to the field of gas detection. The super-surface 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. The utility model can realize high-sensitivity and quick-response hydrogen detection by utilizing the super-surface chip, has simple structure, adopts universal components and parts, and can reduce the manufacturing cost.

Inventors

ZENG PENGYU
YANG XIUYONG
CHANG MING
XU HUI

Assignees

合肥和光微电子科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250408

Claims (10)

1. The hydrogen concentration detection device based on the super-surface optical chip is characterized by comprising an LED light source module, the super-surface optical chip, a photodiode module, a signal conditioning module and a power supply module for supplying power to the modules, wherein the super-surface 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.
2. The hydrogen concentration detection apparatus based on a super surface optical chip as claimed in claim 1, wherein the power module comprises a low dropout linear stabilizer H1 and a chip U1, and an output terminal of the low dropout linear stabilizer H1 is connected to an input terminal of the chip U1.
3. The device for detecting the hydrogen concentration based on the ultra-surface optical chip as claimed in claim 2, wherein the power module further comprises capacitors C2 and C3, one end of the capacitor C2 is connected to the output pin of the chip U1 after being connected in parallel with the capacitor C3, and the other end is grounded.
4. A hydrogen concentration detection apparatus based on a super surface optical chip as claimed in claim 3, wherein the LED light source module comprises an LED driving circuit and a light emitting circuit, the LED driving circuit comprises a chip U2, the light emitting circuit comprises a light emitting diode LED1, a positive power input pin of the chip U2 is connected to an output pin of the chip U1, one control pin of the chip U2 is connected to a cathode of the light emitting diode LED1, and an anode of the light emitting diode LED1 is connected to a positive power input pin of the chip U2.
5. The device for detecting the hydrogen concentration based on the super surface optical chip as claimed in claim 4, wherein the photodiode module comprises a photodiode PD1 and a resistor R2, wherein a cathode of the photodiode PD1 is connected to an output pin of the chip U1, an anode of the photodiode PD1 is connected with one end of the resistor R2, and the other end of the resistor R2 is grounded.
6. The device for detecting the hydrogen concentration based on the super surface optical chip as claimed in claim 5, wherein the photodiode module further comprises a capacitor C4 and a capacitor C6, the capacitor C6 is connected in parallel to two ends of 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.
7. The hydrogen concentration detection apparatus based on a super-surface optical chip as claimed in claim 1, wherein the signal conditioning module comprises a reference voltage output circuit, first to third voltage followers and a differential amplification circuit, the first voltage follower is connected with the reference voltage output circuit and the differential amplification circuit, the second voltage follower is connected with the photodiode module and the differential amplification circuit, and the third voltage follower is connected with the differential amplification circuit and one output voltage port.
8. The device for detecting the hydrogen concentration based on the super surface optical chip as claimed in claim 7, wherein the reference voltage output circuit comprises a chip U3, a resistor R5 and a resistor R6, wherein an input pin of the chip U3 is connected with an output pin of the chip U1, an output pin of the chip U3 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with one end of the resistor R6, and the other end of the resistor R6 is grounded.
9. The hydrogen concentration detection apparatus based on a super surface optical chip as claimed in claim 8, wherein the first voltage follower circuit comprises an operational amplifier U4, a non-inverting input terminal of the operational amplifier U4 is connected to one end of the resistor R5 connected to the resistor R6, an output terminal of the operational amplifier U4 is connected to an inverting input terminal, the second voltage follower circuit comprises an operational amplifier U7, a non-inverting input terminal of the operational amplifier U7 is connected to one end of the resistor R2 connected to the photodiode PD1, an output terminal of the operational amplifier U7 is connected to an inverting input terminal, the third voltage follower circuit comprises an operational amplifier U6, a non-inverting input terminal of the operational amplifier U6 is connected to an output terminal of the differential amplifier circuit, and an output terminal of the operational amplifier U6 is connected to the inverting input terminal.
10. The hydrogen concentration detection apparatus based on a super surface optical chip as set forth in claim 9, wherein the differential amplification circuit comprises an operational amplifier U5, resistors R3, R4, R7, R8, one end of the resistor R4 is connected to an output terminal of the operational amplifier U4, the other end of the resistor R4 is connected to an inverting input terminal of the operational amplifier U5, a non-inverting input terminal of the operational amplifier U5 is connected to one end of the resistor R8, the other end of the resistor R8 is grounded, the non-inverting input terminal of the operational amplifier U5 is further connected to one end of the resistor R7, the other end of the resistor R7 is connected to an output terminal of the operational amplifier U7, one end of the resistor R3 is connected to an inverting input terminal of the operational amplifier U5, and the other end of the resistor R3 is connected to an output terminal of the operational amplifier U5.

Description

Hydrogen concentration detection equipment based on super-surface optical chip Technical Field The utility model relates to the technical field of gas detection, in particular to hydrogen concentration detection equipment based on a super-surface optical chip. Background The hydrogen can be combusted in the air to generate water and heat, so that the hydrogen becomes an important fuel and is widely applied to the fields of industry, energy sources, scientific research and the like. For example, hydrogen gas can be used in fuel cell automobiles, hydrogen fuel cell power generation, ammonia synthesis, and the like. Because of the inflammable and explosive characteristics of hydrogen, the rapid and accurate detection of the hydrogen concentration is important for safe production. However, the existing hydrogen detection circuit is generally complex and has high cost, and is difficult to meet the requirements of miniaturization and low cost, and the sensitivity and the response speed during detection are also difficult to ensure. Disclosure of utility model The technical problem to be solved by the utility model is how to provide a low-cost hydrogen concentration detection device with high sensitivity and quick response. The technical scheme is that the hydrogen concentration detection device based on the super-surface optical chip is characterized by comprising an LED light source module, the super-surface optical chip, a photodiode module, a signal conditioning module and a power supply module for supplying power to each module, wherein the super-surface 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 principle that the intensity of reflected light or refracted light is changed when the concentration of hydrogen is detected, and the special structure and the property of the super surface optical chip, the utility model has extremely high optical properties such as reflectivity, refractive index and transmissivity, and the utility model utilizes the super surface optical chip to receive the light emitted by the LED light source module, and the output electric signal related to the intensity of the light absorbed by the super surface optical chip can intuitively reflect the concentration of the hydrogen after the light intensity absorbed by the super surface optical chip is transmitted by the photodiode module and the signal conditioning module, thereby realizing high sensitivity and quick response when the concentration of the hydrogen is detected. Preferably, the power module comprises a low dropout linear stabilizer H1 and a chip U1, wherein an output terminal of the low dropout linear stabilizer H1 is connected to an input terminal of the chip U1. The utility model can maintain stable voltage output in the circuit by using the low dropout linear stabilizer H1, and can maintain high-efficiency operation even under the condition of small difference between input voltage and output voltage. Preferably, the power module further includes capacitors C2 and C3, one end of the capacitor C2 is connected to the output pin of the chip U1 after being connected in parallel with the capacitor C3, and the other end is grounded. According to the utility model, the filter capacitor is added at the power output end, so that the power noise can be reduced. Preferably, the LED light source module includes an LED driving circuit and a light emitting circuit, the LED driving circuit includes a chip U2, the light emitting circuit includes a light emitting diode LED1, a positive power input pin of the chip U2 is connected to an output pin of the chip U1, one control pin of the chip U2 is connected to a cathode of the light emitting diode LED1, and an anode of the light emitting diode LED1 is connected to the positive power input pin of the chip U2. The LED driving circuit can ensure the stability and consistency of the light source. Preferably, the photodiode module includes a photodiode PD1 and a resistor R2, a cathode of the photodiode PD1 is connected to an output pin of the chip U1, an anode of the photodiode PD1 is connected to one end of the resistor R2, and the other end of the resistor R2 is grounded. Preferably, the photodiode module further includes a capacitor C4 and a capacitor C6, the capacitor C6 is connected in parallel to two ends of 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. Preferably, the signal conditioning module comprises a reference voltage output circuit, first to third voltage followers and a differential amplifying circuit, the first voltage follower is connected with the reference voltage output circuit and the differential amplifying circuit, the second voltage follower is connected with the photodiode module and the differential amplifying circuit, and