Gas detection device and gas detection method

Abstract

The invention discloses a gas detection device and a gas detection method. The gas detection device comprises an infrared light source, a wavelength adjustable light filter, a beam splitter, two infrared light detectors and control modules, wherein the infrared light source is used for emitting infrared light which radiates to the wavelength adjustable light filter; the wavelength adjustable light filter is used for selecting infrared light with specific wavelength from the received infrared light and allowing the selected infrared light to pass through so as to radiate to the beam splitter; the beam splitter is used for splitting the incident infrared light into two beams; one beam radiates to a first infrared light detector, and the other one radiates to a gas to be tested, passes through the gas to be tested and radiates to a second infrared light detector; the two infrared light detectors are used for generating corresponding electric signals according to the intensity of the received infrared light and used for outputting the electric signals to the control modules; the concentration of the gas to be tested is calculated through the control modules. Due to adoption of the gas detection device, not only is the influence of external factors such as temperature on a measurement result reduced, but also measurement errors caused by the aging of components such as the infrared light source and the infrared light detectors along with the time are overcome, and the precision of the detection result is improved.

Description

technical field [0001] The invention belongs to the technical field of gas detection, and in particular relates to a device for detecting gas concentration using infrared light and a gas detection method designed based on the device. Background technique [0002] At present, the gas detection devices designed based on infrared light technology are all designed by taking advantage of the gas's characteristic of absorbing infrared light of a specific wavelength. The concentration of the target gas can be calculated indirectly by detecting the intensity of infrared light of a specific wavelength absorbed by the gas. [0003] Most of these gas detection devices are equipped with an infrared light source, a wavelength-tunable filter and an infrared light detector. Among them, the infrared light source is used to emit infrared light and shoot to the wavelength-tunable filter; the wavelength-tunable filter, namely the Fabry-Perot filter, is used to select the infrared light of a s...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the accuracy of the detection result of the existing infrared gas detection device will decrease significantly with the change of the ambient temperature and the aging of the device, a gas detection device with simple structure and small detection error is proposed. device, providing hardware support for more accurate measurement of the concentration of the target gas

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