Long-optical-path air chamber with stable encapsulation structure

Abstract

The invention provides a long-optical-path air chamber with a stable encapsulation structure. By adopting an encapsulation column, a loop and a concave reflective mirror with a central hole, optical and mechanical elements are closely laminated or sheathed, the optical path of the air chamber can be ensured to have stability to temperature and mechanical stress change while the flexible adjustment capability of the optical path of the air chamber is realized. The invention further provides a buffer ring with certain elasticity, the optical element of a reflective cavity is buffered and separated from an outer encapsulation body, and the optical stability of the air chamber is further enhanced.

Description

technical field [0001] The invention relates to a long optical path gas chamber for gas sensing, in particular to a long optical path gas chamber with a stable packaging structure, which is easy to adjust the optical path and has high temperature and mechanical stability. Background technique [0002] The detection of dangerous gases such as gas and carbon monoxide is of great significance for the safety protection of dangerous workplaces such as coal mines and oil and gas fields. It is of great significance to detect early release of dangerous gases and prevent problems before they happen. At this stage, tunable laser absorption spectroscopy technology has been widely used in the field of gas sensing. This technology uses the characteristic absorption peaks of gas, carbon monoxide and other dangerous gas molecules in the near-infrared band over-frequency and combined frequency bands, and uses adjustable laser scanning in this band to obtain the intensity of the characterist...

AI Technical Summary

Problems solved by technology

In order to meet the needs of processing flexibility, the base and the packaging rod are usually made of metal, and its thermal expansion coefficient often does not match the thermal expansion coefficient of the optical material of the optical mirror (201, 202), resulting in thermal instability of the optical system; in addition, the base Under the action of external force or due to the residual stress in the process of processing, the metal material of the packaging rod is easy to deform over time, which also causes changes in the optical path

can be seen, figure 2 Although the package structure shown is relatively simple, the output optical power is easily affected by temperature, stress, and mechanical vibration, and the optical structure is unstable.

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