Absorption cell for gas detection

Abstract

The invention discloses an absorption cell for gas detection. The absorption cell comprises an optical fiber collimation module, a focusing module and a cavity located between the optical fiber collimation module and the focusing module, wherein the optical fiber collimation module comprises an optical fiber collimator, a precise dimming structure and an optical fiber collimation module fixing end; the focusing module comprises a focusing lens and a focusing module fixing end, and the optical axis of the focusing lens coincides with the central axis of a cavity air chamber and the optical axis of the optical fiber collimation module; two ends of the cavity are connected with the optical fiber collimation module fixing end and the focusing module fixing end in a sealed manner, the hollow part of the cavity is the air chamber for accommodating to-be-detected gas, and the lateral side of the air chamber is provided with a gas inlet and a gas outlet, and the top of the gas chamber is provided with threaded holes used for mounting at least one sensor for detecting parameters such as the temperature and the pressure of the gas chamber. The gas absorption cell is small in size, short in optical path, simple in structure, convenient to mount, debug and maintain, applicable to the detection of ppm-level dissolved gas in transformer oil, and the like.

Description

technical field [0001] The invention belongs to the field of precision detection instruments, and in particular relates to an absorption cell for gas detection, in particular to a gas absorption cell for detecting dissolved gas in transformer oil. Background technique [0002] The technology of measuring single-component or multi-component gases by spectrometry has become more and more widely used in industry. For example, laser spectrometers can be used to monitor dissolved gases in transformer oil. Due to the "fingerprint" characteristics of gas absorption, after the light passes through the absorption cell filled with the gas to be detected, a single frequency of light is absorbed by the gas in the cell, the single frequency reflects the gas composition, and the change of the single frequency light intensity reflects the The concentration of the gas to be detected. The detection process of this gas composition is widely used in the fields of industrial production and en...

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Problems solved by technology

[0005] In order to solve the above-mentioned problems of the long optical path cell and the adjustable optical path cell in the prior art, the present invention provides a small volume short optical path gas absorption cell, the small volume short optical path gas absorption cell changes the existing long optical path The complex structure of Chengchi overcomes the defects of difficult optical path adjustment and poor shock resistance

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