Sample detection device based on herriott multiple reflection cell

Abstract

The invention discloses a sample detecting device based on a Herroitt multi-reflect pool. The sample detecting device comprises a detecting tube. The two axial ends of the detecting tube are provided with an incidence reflector and an outgoing reflector respectively. The inner cavity of the detecting tube serves as a detecting chamber. A gas inlet and a gas outlet which are communicated with the detecting chamber are formed in the detecting tube. The incidence reflector is fixed to one end of the detecting tube. An incidence hole is formed in the mirror face of the incidence reflector. The outgoing reflector is arranged at the other end of the detecting tube. Light rays emitting into the incidence hole are reflected multiple times on the two opposite mirror faces of the incidence reflector and the outgoing reflector. A light-permeable window for emitting out light rays reflected multiple times and making light rays received by a light detecting device is formed in the mirror face of the outgoing reflector. The sample detecting device is simple in structure, convenient to install, low in manufacturing cost, adjustable in light stroke, easy to obtain and free of independent additional direction change devices; the incidence hole and the light-permeable window are located in the two axial ends of the detecting tube respectively, and the light emitting device and the light detecting device can be conveniently installed.

Description

technical field [0001] The invention relates to the field of gas detection, in particular to a sample detection device based on a Herriott multiple reflection cell. Background technique [0002] In sample detection, in order to increase the lower limit of detection, increasing the optical path length is one of the very effective methods; there are many ways to increase the optical path length, and the typical ones are White cell and Herriott cell. For example, the invention patent with the application number CN200810246800.6 discloses a multiple reflection device based on the White pool structure. The structure of the White pool is simple, only two concave mirrors are needed, and the reflected light points are arranged separately on the two mirror surfaces, which reduces the generation of interference and is also widely used. However, it has a small aperture angle, is difficult to adjust, and the angle between the incident and reflected light is small, which makes it inconv...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a sample detection device based on the Herriott multiple reflection pool to solve the problem of the existing sample detection device with high processing and installation precision requirements and the impact of environmental changes on the Herriott multiple reflection pool or the need to add a direction changing device separately The resulting technical problems are that the mirror surface cannot be fully utilized, the structure is complex, the installation fit is high, and the manufacturing cost is high.

Images