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Gas sensor based on selective wave bands and detection method thereof

A gas sensor and sensor technology, applied in the direction of color/spectral characteristic measurement, instruments, measuring devices, etc., can solve the problems of poor selectivity and low sensitivity, and achieve the effects of improving stability, improving selectivity and reducing aging problems

Active Publication Date: 2017-06-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, like the traditional high-temperature sensors, there are still disadvantages of poor selectivity and low sensitivity.

Method used

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  • Gas sensor based on selective wave bands and detection method thereof
  • Gas sensor based on selective wave bands and detection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] see figure 1 and figure 2As shown, a gas sensor based on a selective wavelength band provided in this embodiment includes a packaging assembly 4, a metal oxide sensor array 1 and a light source 2, and the packaging assembly 4 combines the oxide sensitive material 3 of the metal oxide sensor array 1 and the The light source 2 is enclosed in a sealed space, and the packaging assembly 4 includes an air inlet 5 and an air outlet 6. The light source 2 is a light source with variable wavelength. In this embodiment, only one light source with variable wavelength is used, which can reduce the volume of the sensor. The wavelength band of the light source (range of wavelength) includes 180-254nm, 300-320nm, 340-360nm, 365-400nm and 500-600nm, and the metal oxide sensor array is provided with different oxide sensitive materials , under the irradiation of light of a certain wavelength band mentioned above, at least one metal oxide sensor has a higher sensitivity to a certain gas ...

Embodiment 2

[0048] The difference between the technical solution of this embodiment and that of Embodiment 1 is only the difference in the setting of the light source. In this embodiment, only the different parts are described, and the same parts will not be repeated. The light source in this embodiment is a plurality of light sources with fixed wavelength ranges. The variable light sources are separated and no longer continuously changed. Instead, they are made into fixed light sources with different wavelength ranges, and the gas sensor array unit is repeated, and then combined. .

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Abstract

The invention relates to a gas sensor based on selective wave bands and a detection method thereof. The gas sensor based on the selective wave bands provided by the invention comprises a metal oxide sensor array and a light source. The light source is a light source with variable wavelengths. The wave bands of the light source comprise 180-254nm wave band, 300-320nm wave band, 340-360nm wave band, 365-400nm wave band and 500-600nm wave band. Different oxide sensitive materials are arranged on the metal oxide sensor array. Irradiated by light in some wave band, at least one metal oxide sensor is relatively high in sensitivity to one of to-be-detected gas and is relatively low in sensitivity to other to-be-detected gas. The sensor has the beneficial effects that compared with an existing conventional heating type gas sensor array technology, on the one hand, the gas sensor can work at room temperature to reduce the ageing problem of a sensitive material and improve the stability of the sensor, and on the other hand, improves the selectivity on gas recognition by changing the wavelengths of the light.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a gas sensor based on a selective band and a detection method thereof. Background technique [0002] With the deterioration of the environment, industrial exhaust gas such as petrochemical, coal chemical and motor vehicles has become a serious threat to people's living environment and health. Therefore, the implementation of monitoring and detection of the concentration of harmful gases in the environment has become an important technical requirement. Metal-oxide-semiconductor-based gas sensors are one of the important technologies. However, under normal circumstances, gas sensors using metal oxide semiconductor sensitive materials need to work between 200-500 degrees Celsius, which brings a large energy demand. Ultimately, the device performance deteriorates and the service life is shortened. Recently, people have begun to use nanomaterial technology and light-assisted ac...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/25G01N21/01
CPCG01N21/01G01N21/255G01N21/31G01N2021/3129
Inventor 李晓干王雪燕赵阳阳李筱昕陈宇鹏
Owner DALIAN UNIV OF TECH
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