Plano-convex mirror multi-pass absorption cell for preventing lens film corrosion and pollution

Abstract

The invention discloses a plano-convex mirror multi-pass absorption cell for preventing lens film corrosion and pollution. The plano-convex mirror multi-pass absorption cell comprises a multi-pass absorption cell body (5) and spherical mirrors coated with reflecting films, the multi-pass absorption cell body (5) is provided with a gas inlet (10) and a gas outlet (6), the spherical mirrors are placed at two ends of the multi-pass absorption cell body (5) and include a first plano-convex spherical mirror (4) and a second plano-convex spherical mirror (7), the convex spherical surface of the first plano-convex spherical mirror (4) is back to that of the second plano-convex spherical mirror (7), planes of the first plano-convex spherical mirror (4) and the second plano-convex spherical mirror (7) are hermetically connected with two ends of the multi-pass absorption cell body (5) respectively, the convex spherical surfaces are coated with the reflecting films (8), an incident light hole (3) without coated reflecting films is formed in the reflecting film (8) at the edge of the first plano-convex spherical mirror (4), and an emergent light hole (9) without coated reflecting films is formed in the reflecting film (8) at the edge of the second plano-convex spherical mirror (7). The plano-convex mirror multi-pass absorption cell can be widely applied to detection of polluted or corrosive gas.

Description

technical field [0001] The invention relates to an optical multi-pass absorption pool, in particular to a plano-convex mirror multi-pass absorption pool for preventing lens film layer corrosion and pollution. Background technique [0002] As an optical instrument, the optical multi-pass absorption cell has been widely used in laser absorption spectroscopy. It can achieve a long optical path in a relatively small volume, thereby improving the detection sensitivity and reducing the detection limit. At present, the commonly used optical multi-pass absorption cell, such as a Herriot multi-pass absorption cell and method using a spherical mirror disclosed in European patent application EP 2375237 A1 on October 12, 2011. The multi-pass absorption cell mentioned in the invention patent application document is composed of a multi-pass absorption cell body with air inlet and outlet, and plano-concave spherical mirrors located at both ends of the multi-pass absorption cell body, where...

AI Technical Summary

Problems solved by technology

Although this multi-pass absorption cell can increase the absorption optical path, it also has disadvantages: when it is applied to the detection of pollution or corrosive gases, these gases will pollute or corrode the film layer of the lens; Or the corroded lens film will shift the optical path in the multi-pass absorption cell, and lead to the increase of stray light and interference signal in the multi-pass absorption cell, thus affecting the signal-to-noise ratio of the detection signal

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