Multi-station automatic switching type opticalpath device and spectrograph

Abstract

The invention provides an optical path device supporting multi-station automatic switching and fine tuning of lamp sources. The device comprises a mounting fine tuning device and a power output device; a multi-station flange in the mounting fine tuning device is a disc with a central hole; a plurality of light source mounting seats are symmetrically arranged; and a rotary support shaft penetratesthrough the central hole of the flange. The power output device can drive the multi-station flange to rotate by rotating the supporting shaft and drive the light source to rotate to reach a designatedposition. The invention also provides a gas-phase molecular absorption spectrograph comprising the optical path device. According to the invention, the light source can be automatically selected to reach the designated to-be-detected position, and the fault light source can be moved out of the designated to-be-detected position at any time; meanwhile, a stepping motor is matched with an infraredoptical coupling induction technology, and the position of the lamp source installed on the multi-station flange plate is accurately and finely adjusted.

Description

technical field [0001] The invention relates to an optical analysis instrument, in particular to an optical path device of a gas-phase molecular absorption spectrometer supporting multi-station switching and fine-tuning of light sources, and a gas-phase molecular absorption spectrometer prepared by the same. Background technique [0002] Gas Phase Molecular Absorption Spectrometry (GPMAS for short) is based on the principle that the relationship between the light absorption intensity of the gas decomposed into the measured component and the concentration of the measured component complies with the law of light absorption; according to the different absorption wavelengths, Qualitative analysis can also be performed by determining the components to be measured. Gas-phase molecular absorption spectrometry can be used to determine ammonia nitrogen, total nitrogen, sulfide, nitrate nitrogen, nitrite nitrogen, Kjeldahl nitrogen, etc. The detection principle of gas-phase molecular...

AI Technical Summary

Problems solved by technology

Although this invention can detect light-sensitive substances with multiple wavelengths of light synchronously, the position of the light source is fixed, and it is necessary to switch the light source to emit light of different wavelengths during use, and it undergoes multiple reflections during the detection process. It leads to a decrease in light intensity and purity, and requires precise setting of various total reflection mirrors and filters at different positions, resulting in an overly complex structure, high cost, decreased sensitivity, and insufficient maintenance of the light source.

At the same time, this kind of device that emits different wavelengths through the same light source is very prone to the defect that the failure of a single light source will affect the work of other light sources, and it is difficult to adjust the position of the light source

[0011] Therefore, there is currently a need for an optical path device that can automatically switch light sources on multiple different stations. The optical path device should have the advantages of automatic and mechanized switching of light sources and adjustment of light source positions, and avoid the defects that a single light source failure will affect the work of other light sources. At the same time, it also has the advantages of simple structure, high fault tolerance rate that can integrate a variety of different light sources (such as hollow cathode lamps, tritium lamps) or multiple light sources, and easy maintenance.

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