High-precision infrared multi-gas detection device

Abstract

The invention discloses a high-precision infrared multi-gas detection device, and belongs to the field of gas detection. According to the high-precision infrared multi-gas detection device, with the combination of a variable cavity long light filter and an infrared light source which has a wide spectrum and has a stepper type working mode and a scanning working mode, gating wavelength which is emitted to a pyroelectricity sensitive unit to be detected can be controlled, and furthermore high-precision detection on multiple gases by using a single device can be achieved; through comparative analysis on output signals of a reference gas chamber and an absorption gas chamber, a relatively precise detection result can be obtained; meanwhile, due to the reference gas chamber, external factor interference can be reduced; in addition, a plurality of concave mirrors which can be reasonably adjusted through an optical distance component are arranged inside the absorption gas chamber, so that optical distance adjustment can be achieved, and measurement on concentration of different gases under high detection precision can be achieved. Due to a reasonable design structure, the types and the concentration of multiple gases can be detected with high precision at one time by using the single device, a novel gas detection device with good properties can be provided, and the application field of infrared gas detection can be widened.

Description

technical field [0001] The invention relates to the field of gas detection, in particular to a high-precision infrared multi-gas detection device. Background technique [0002] Rapid and accurate detection of gas concentration is an essential key technology for environmental protection monitoring, safety production, medical monitoring, and industrial processes. Wide application, the research of gas detection device has received great attention. [0003] With the development of economy and technology, people put forward higher and higher requirements for gas detection devices. The infrared gas sensor developed rapidly in recent years has incomparable advantages of traditional gas sensors, so it has attracted the attention of scholars at home and abroad, representing An important development direction of gas sensing technology. [0004] Traditional gas detection devices are often used to detect a single gas. If multiple gases need to be detected, multiple sets of detection d...

AI Technical Summary

Problems solved by technology

In addition, in the prior art, the light source and the detector are often arranged in a straight line, and the length of the gas absorption chamber limits the optical path in the process of gas detection to a certain extent. Therefore, the absorption of infrared wavelengths by gas molecules is affected by the Influenced by the length, this design makes the gas sensor structure larger, inconvenient to carry and limited in the measurement of multiple gases, which will affect the detection accuracy; and in the case of non-vacuum, there will be ambient gas molecules in the gas chamber to absorb interference , will also affect the detection accuracy

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