Optical absorption device with adjustable double absorption optical paths

Abstract

The invention discloses an optical absorption device with adjustable double absorption optical paths. The optical absorption device comprises an absorption cell formed by an adjustable left reflector and an adjustable right reflector, arranged according to a Herriott absorption cell, wherein a light passing hole is formed in the left reflector, and a small semi-penetration semi-reflection coated frustum is arranged in a through hole in the right reflector. A light beam enters the absorption cell, is reflected between the double reflectors for many times, and then is transmitted and reflected by the small semi-penetration semi-reflection frustum after reflected for certain times, transmitted light generates a short absorption light path, reflected light is further reflected back and forth in the absorption cell and goes out of the light passing hole of the left reflector so as to generate a long absorption light path, and the ratio of the double absorption light paths can be conveniently changed by rotating the reflector with the small semi-penetration semi-reflection coated frustum. The absorption cell is compact in structure and convenient to adjust, two different absorption light paths can be obtained by the single optical absorption cell, and thus the optical absorption device has important application value in the fields of multicomponent gas measurement, isotope detection and the like.

Description

technical field [0001] The invention relates to the field of atmospheric component laser spectrum detection and analysis devices, in particular to an adjustable optical path double-absorption optical path optical absorption device. Background technique [0002] Laser spectrum detection and analysis of atmospheric components uses laser absorption spectroscopy to measure trace gases in the atmosphere. Since the absorption of some trace gases is very small, it is necessary to increase the absorption path of the gas to increase the absorption of the gas and improve the detection accuracy. Sensitivity, so it is necessary to use multiple reflection devices to achieve a large absorption path in a small volume; in addition, in multi-component detection and isotope detection, strong absorption requires a short path, while weak absorption requires a long path. Pools generally cannot meet both needs at the same time. The device involved in the present invention can realize two differe...

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Problems solved by technology

[0002] Laser spectrum detection and analysis of atmospheric components uses laser absorption spectroscopy to measure trace gases in the atmosphere. Since the absorption of some trace gases is very small, it is necessary to increase the absorption path of the gas to increase the absorption of the gas and improve the detection accuracy. Sensitivity, so it is necessary to use multiple reflection devices to achieve a large absorption path in a small volume; in addition, in multi-component detection and isotope detection, strong absorption requires a short path, while weak absorption requires a long path. Pools generally cannot meet both needs at the same time

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