Long-path optical absorption cell adjustable in optical path

Abstract

The invention discloses a long-path optical absorption cell adjustable in optical path. The long-path optical absorption cell adjustable in optical path comprises an incident end and an emergent end; the incident end and the emergent end are connected and fixed by use of a metal supporting rod, can directly form an open measurement system, and can also be combined with a quartz glass chamber to form a seal structure; an incident spherical mirror adjustable by use of an inclined screw is mounted on the incident end; an incident light hole is formed in the incident spherical mirror; an emergent spherical mirror adjustable by use of a rotating shaft plate is mounted on the emergent end; an emergent light hole is formed in the emergent spherical mirror; incident light is reflected between the incident spherical mirror and the emergent spherical mirror in the absorption cell, and therefore, long optical path is realized; the light hole is rotated so that a light beam is emitted from different positions, and quasi-continuous adjustability of the long optical path is realized. The long-path optical absorption cell adjustable in optical path is simple in structure and adjustable optical path is effectively realized.

Description

technical field [0001] The invention belongs to a long optical path optical device, in particular to an adjustable optical path optical gas absorption pool 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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