A long-range optical absorption cell with adjustable optical length

Abstract

The invention discloses a long optical path absorption cell with adjustable optical path, which includes an incident end and an exit end, and the incident end and the exit end are connected and fixed by metal struts, which can directly constitute an open measurement system, and can also be added with quartz glass. The cavity constitutes a sealed structure, the incident end is equipped with an incident spherical mirror adjustable by tilting screws, the incident spherical mirror is provided with an incident light hole, and the outgoing end is equipped with an adjustable by rotating the shaft plate. The outgoing spherical mirror is provided with an outgoing light hole, and the incident light is reflected between the incoming spherical mirror and the outgoing spherical mirror in the absorption pool to achieve a long optical path, and the light beam is emitted from different positions by rotating the light hole to achieve The quasi-continuously adjustable long optical path, the invention has a simple structure and effectively realizes the adjustable optical path.

Description

technical field [0001] The invention belongs to a long optical path optical device, in particular to an adjustable optical path optical gas absorption cell device based on the principle of multiple reflections. Background technique [0002] With the rapid development of infrared and laser technology, spectral detection technology based on gas infrared absorption has become an effective detection method for trace gases in the environment and industrial processes. According to the Beer-Lambert formula, the absorption pathlength and the absorption coefficient of the measured gas have the same effect on the measurement sensitivity, and the sensitivity increases with the increase of the pathlength. The concentration of the gas of interest varies greatly in clean and polluted environments, from percent concentration to ppm level, or even to several ppb. , the optical path length is required to change accordingly, from a few meters to hundreds of meters. Long-range optical absorp...

AI Technical Summary

Problems solved by technology

The disadvantage of the Herriott type long-range optical cell is that the optical path cannot be adjusted after the structure is fixed, and the optical path cannot be changed to obtain the best analysis effect for gas spectrum analysis with different absorption line intensities, and the incident and outgoing beams use the same optical hole. The included angle is small, it is difficult to set the optical path outside the optical cell, the optical path exposed outside the cell is long, and the ambient gas interferes greatly with the analysis of the target gas

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