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Classification and Principle of Hydrogen Pressure Sensor
Release time:2022-04-13
1. The semiconductor sensor of hydrogen pressure sensor takes the resistive semiconductor sensor as an example: sno2, zno, wo3 and other metal oxides are mainly used as gas-sensitive materials. For example, the domestic qm series hydrogen sensor is based on sno2 as hydrogen sensitive material, so it is also called metal oxide semiconductor hydrogen sensor. Its working principle is: when hydrogen is adsorbed, hydrogen acts as a donor to release electrons and combines with oxygen ions in the chemical adsorption layer, so the carrier concentration changes, and the change value has a certain function relationship with the volume fraction of hydrogen.
1.Hydrogen pressure sensorsemiconductor sensor
Take resistive semiconductor sensors as an example: metal oxides such as sno2, zno, wo3, etc. are mainly used as gas-sensitive materials. For example, the domestic qm series hydrogen sensor is based on sno2 as hydrogen sensitive material, so it is also called metal oxide semiconductor hydrogen sensor. Its working principle is: when hydrogen is adsorbed, hydrogen acts as a donor to release electrons and combines with oxygen ions in the chemical adsorption layer, so the carrier concentration changes, and the change value has a certain function relationship with the volume fraction of hydrogen.
2.Hydrogen pressure sensorPyroelectric sensor
First, deposit a layer of thermoelectric material on the substrate, and then deposit a layer of catalytic metal, such as platinum, palladium, etc., It is deposited on a certain part of the surface of the thermoelectric material and is taken out from the catalytic metal layer and the thermoelectric thin film layer (without catalytic metal on the surface), respectively, to obtain a simple thermoelectric hydrogen sensor. When the sensitive element is exposed to an environment containing hydrogen, the hydrogen reacts with oxygen under the action of the catalytic metal, generating water vapor and releasing heat. Therefore, the end where the catalytic metal is deposited has a high temperature, and the end where the catalytic metal is not deposited has a low temperature, which is the cold end. Due to the thermoelectric power generation effect (Seebeck effect) of thermoelectric materials, the temperature difference between the hot end and the cold end is converted into a temperature difference potential, which is output as an electrical signal, thereby realizing the detection of hydrogen.
3.Hydrogen pressure sensorfiber optic sensor
Due to various solidHydrogen pressure sensorAll use electrical signals. A common disadvantage is that electric sparks may be generated, which is a big hidden danger for the environment with high hydrogen volume fraction. Fiber optic sensors use light signals and are therefore suitable for explosive hazardous environments.
4.Hydrogen pressure sensorPalladium Alloy Thin Film Hydrogen Sensor
The new third generationHydrogen pressure sensorThe technology is palladium alloy nano thin film hydrogen sensing technology, which has hydrogen specificity, full range, no interference from other gases, no oxygen during the measurement process, and long service life.
Keywords:Hydrogen pressure sensor
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