Light path system of trace gas sensor and air chamber

Abstract

The invention discloses a light path system of a trace gas sensor and an air chamber, wherein the light path system comprises an incidence optical fiber collimator, an emergence optical fiber collimator, a front reflector and a rear reflector, wherein the front reflector and the rear reflector are concave spherical mirrors, concave spherical surfaces are opposite, the mirror surface of the front reflector is provided with an incidence through hole and an emergence through hole parallel to each other; the incidence optical fiber collimator and the emergence optical fiber collimator are coaxial to the incidence through hole and the emergence through hole, are arranged at the outer side, far away from the rear reflector, of the front reflector, and are used for irradiating light beams emitted by the incidence optical fiber collimator to the rear reflector through the incidence through hole of the front reflector, the light beams are reflected by the front reflector and the rear reflector for a plurality of times, and then are irradiated out through the emergence optical collimator by virtue of the emergence through hole in the front reflector. According to the light path system provided by the invention, the light beams are reflected for a plurality of times between the front reflector and the rear reflector, and very high absorption optical path can be achieved within limited space, and the light path system is suitable for the optical gas sensor which has a compact structure and is used for accurately detecting trace gas.

Description

technical field [0001] The invention belongs to the technical field of optical fiber gas sensors, and in particular relates to an optical path system of a trace gas sensor, and also relates to a gas chamber of a trace gas sensor. Background technique [0002] Optical fiber gas sensor is a new type of gas sensor that appeared in the late 1980s. It has the characteristics of high measurement sensitivity, strong gas discrimination ability, fast response, and strong resistance to environmental interference such as temperature and humidity. It is the most promising An optical fiber gas sensor. The sensing part of the fiber optic gas sensor is an absorption gas chamber, and its design is directly related to the volume and persistence measurement sensitivity of the entire fiber optic gas sensor. [0003] Optical gas sensors based on the principle of gas absorption follow Beer-Lambert's law, that is, when a beam of parallel monochromatic light passes through a uniform non-scatterin...

AI Technical Summary

Problems solved by technology

Due to the limitations of the on-site environment and detection equipment, it is unrealistic to use the usual through-beam optical path, and it is difficult to meet the requirements of on-line testing. Therefore, an optical path system that satisfies a longer optical path and has a smaller volume is required.

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