Optical fiber LIBS detection system and method for underwater detection

Abstract

The invention relates to an optical fiber LIBS (Laser-induced Breakdown Spectroscopy) detection system and a method for underwater detection. The optical fiber LIBS detection system comprises a laseroutput module, an underwater optical fiber LIBS probe and a control processing module. When the optical fiber LIBS detection system is used for detection, the underwater optical fiber LIBS probe is inflated through an air nozzle, and liquid below an optical window is discharged through a water discharge port, so that an air-like environment is created near the surface of a sample to be detected, thus an efficiency of laser breakdown induced plasma and a signal-to-background ratio of collected spectrum are greatly improved; various gas medium environments can be made in the underwater optical fiber LIBS probe according to actual requirements so as to meet medium environment requirements of laser detection for various elements; the optical fiber LIBS detection system can realize simultaneousanalysis of multiple elements, is safe and reliable in operation, high in repeatability, sensitivity and measurement accuracy, high in spectral signal-to-noise ratio, high in element detection limit,high in analysis speed and high in efficiency, can be used for remote online monitoring, and effectively solves the difficulty of underwater LIBS element detection.

Description

technical field [0001] The invention relates to the technical field of laser diagnosis, in particular to an optical fiber LIBS detection system and method for underwater detection. Background technique [0002] Laser Induced Breakdown Spectroscopy (LIBS for short) is a measurement technique that uses the emission spectrum of the plasma generated on the surface of the material to be measured to quantitatively measure the elemental components and mechanical parameters of the sample by using the laser. Compared with other detection methods, LIBS technology has obvious advantages: remote online in-situ detection, minimal or even non-destructive sample damage, no need for sample pretreatment, and simultaneous analysis of multiple elements. [0003] Fiber-transmitted laser-induced breakdown spectroscopy technology (hereinafter referred to as fiber-optic LIBS technology) is an improvement and innovation of the previous traditional induced breakdown spectroscopy technology, and is m...

AI Technical Summary

Problems solved by technology

Underwater plasma is affected by both water and air bubbles, causing the emission spectrum to be absorbed and scattered, so the signal detected by underwater LIBS is weak

At present, for the complex underwater detection environment in nuclear power plants, the LIBS detection system that can realize remote control and reliable operation still needs further development

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