Laser induced single droplet breakdown detection method and device

Abstract

The invention discloses a laser induced single droplet breakdown detection method and a laser induced single droplet breakdown detection device. The structure of the device is as shown in attached drawings. During operation, a liquid sample is injected into a capillary tube through a micro syringe; air or specified gas is injected into a pneumatic chamber through a micro air pump; the liquid sample in the capillary tube is pushed to eject out of the capillary tube; droplets axially move along a tube column of the capillary tube under the airflow function of a guide exhaust port; when continuous light beams transmitted by a low-power continuous laser are blocked by the droplets, a photoelectric detector triggers an auxiliary control circuit to generate a time delay signal. Laser pulse transmitted by a pulsed laser is focused through a focusing lens group to break down the droplet sample; a light radiation signal is coupled into an optical fiber through a collecting lens group, split by a grating spectrometer and detected by a detector, and a spectral signal is displayed, stored and processed by a computer. The device can be applied to the field of application of high-precision component detection in the fields of chemical industry, foods and medicines and also can be applied to the field of basic research in the field of scientific research.

Description

technical field [0001] The invention is applicable to the application of laser-induced breakdown spectroscopy technology in the field of detection and analysis of chemical element components, and the field of basic research on the physical mechanism of interaction between laser and matter. Specifically, the present invention can generate a certain volume of spherical sample droplets in a gas environment through auxiliary equipment, and then introduce laser pulses to ablate the sample droplets, and finally achieve qualitative and quantitative analysis by studying the spectral radiation characteristics of different chemical elements in the sample The purpose of the element composition in the sample; at the same time, it can be used to study the interaction process between laser and matter, as well as the formation and evolution characteristics of plasma. The detection system designed by the present invention can be used for high-precision component detection applications in the ...

AI Technical Summary

Problems solved by technology

At the same time, laser-induced breakdown spectroscopy has been widely valued in the field of chemical analysis applications, but due to the uncontrollable ablation process and the limited understanding of the physical mechanism behind this technology, the development of LIBS detection technology It is also limited to a certain extent, so the relevant theoretical basis needs to be developed urgently

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