Spectral measurement method of spectrograph

Abstract

The invention provides a spectral measurement method of a spectrograph. The method includes the following steps: A) receiving an optical signal sent from a light source by means of an optical coupling device; B) performing coupling incidence of the optical signal into an optical resonator cavity; C) collecting the optical signal outputted from the optical resonator cavity and making an absorption spectrum curve of the sample with the collected data as a basic data; and D) according to the absorption spectrum curve, obtaining an absorption spectrogram and concentration information of the sample through data processing. The spectral measurement method not only is high in detection sensitivity degree but also is wider in spectrum detection capability, thereby achieving on-line calibration of effective optical distance, removal of optical noise of the optical resonator cavity, and posture adjustment function of a cavity lens or cavity length scanning. The spectral measurement method can achieve high-sensitivity synchronous detection of various components in the sample and satisfies the object of continuously and accurately real-time monitoring the sample for a long period.

Description

technical field [0001] The invention belongs to the technical field of spectrum measurement, in particular to a spectrum measurement method of a spectrometer. Background technique [0002] The key components of traditional ring-down absorption spectrometer (Cavity Ringdown Spectroscopy, CRDS), hereinafter referred to as CRDS spectrometer and cavity enhanced absorption spectrometer (Cavity Enhanced Spectroscopy, CEAS), hereinafter referred to as CEAS spectrometer are optical resonant cavities composed of high reflectivity lenses, which form the CRDS spectrometer and The length of the resonant cavity of the CEAS spectrometer is generally within 1m, and the typical length is 30cm to 70cm. Therefore, in order to improve the detection sensitivity in such a short absorption pool, we usually start with increasing the reflectivity of the lens. [0003] Correspondingly, in the prior art, it is an objective fact that improving the reflectivity of the lens will be subject to many rest...

AI Technical Summary

Problems solved by technology

[0003] Correspondingly, in the prior art, it is an objective fact that improving the reflectivity of the lens will be subject to many restrictions; for example: firstly, it is difficult to coat in the ultraviolet and infrared bands, which limits the application of this technology in the ultraviolet and infrared bands; secondly, It is difficult to obtain high reflectivity in a wide optical frequency band at the same time, which limits the ability of this technology to detect multiple components at the same time; finally, because the coating on the lens will be affected by moisture in the environment, the reflectivity of the lens will vary with time. The use will decrease, resulting in a decrease in detection sensitivity, and even inaccurate measurement results

Images