Long-distance substance detection device based on ultraviolet Raman spectrum analysis

Abstract

The invention provides a long-distance substance detection device based on ultraviolet Raman spectrum analysis, and relates to the field of laser detection. The long-distance substance detection device comprises a remote detection probe which comprises an ultraviolet collimating lens and an ultraviolet objective lens which are coaxially arranged, an ultraviolet laser which is used for continuouslyemitting ultraviolet laser beams, sending the ultraviolet laser beams to the remote detection probe through an ultraviolet light path assembly and converging and irradiating a detection target through the ultraviolet collimating mirror; the remote detection probe continuously receives the target scattered light through the ultraviolet objective lens and sends the target scattered light to an ultraviolet spectrograph through the ultraviolet light path assembly, and the ultraviolet spectrograph performs filtering and spectral analysis on the target scattered light to obtain a target spectral curve and obtain a Raman spectrum through shooting; and an analysis device is used for carrying out multidimensional comparison on the Raman spectrum and a plurality of known substance spectrum data toobtain a substance component analysis result. The ultraviolet pulsation quasi-continuous emitting laser is used for increasing the emitting distance of laser, long-distance non-contact detection is achieved, and the influence of stray light on the detection precision is reduced in cooperation with a light filtering assembly.

Description

technical field [0001] The invention relates to the field of laser detection, in particular to a remote substance detection device based on ultraviolet Raman spectrum analysis. Background technique [0002] There are many instruments that can analyze the composition of substances, but there are very few instruments that can remotely detect and analyze substances several meters away, especially the detection methods that can perform long-distance non-contact substance analysis on the spot are still scarce. Discussing the reason is that in addition to the laser Raman spectrometer, the mass spectrometer is accurate but cumbersome among the commonly used material analysis instruments. The sample to be tested needs to be prepared and put into the detection end to perform mass spectrometry analysis by ionization under a vacuum magnetic field, which cannot be remotely detected. ; All kinds of infrared spectrometers also need to prepare the test items and put them into the instrumen...

AI Technical Summary

Problems solved by technology

The early detection of laser Raman spectrometer is to use visible light laser or near-infrared laser to irradiate the object at close range to obtain the excited Raman spectrum. Due to the interference of the Mann spectrum curve, the sample distance is too far away to excite the ingestible Raman scattering spectrum because the energy is too weak. Therefore, in the past, it was limited by the low intrinsic Raman scattering efficiency of visible light and infrared light and fluorescence interference, etc. Problem, the ordinary laser Raman spectrometer is only suitable for detection and analysis next to the item

[0004] In recent years, Raman spectroscopic instruments and technologies using ultraviolet lasers have appeared. Although the intrinsic Raman scattering efficiency has been improved and the interference of fluorescence on the Raman spectral curve has been eliminated, the detection distance of general Raman spectroscopic instruments is still not far enough. Constrained by factors such as the small ultraviolet laser energy, poor imaging quality of the ultraviolet optical system, short optical focal length of the detection probe, small aperture and other factors, Raman spectroscopy instruments that have no object detection and analysis distance of several meters have appeared in the market

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