A tunable reheating double-pulse laser-induced breakdown spectroscopy device
A laser-induced breakdown and double-pulse technology, applied in the field of laser spectroscopy, can solve problems such as difficult adjustments, achieve the effects of multiple adjustable parameters, improve detection repeatability, and improve collection efficiency and spectral line intensity
Active Publication Date: 2017-05-10
ZHEJIANG UNIV
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Problems solved by technology
[0005] In order to realize the laser-induced breakdown spectroscopy reheating working mode on the same device, the present invention discloses an adjustable reheating double-pulse laser-induced breakdown spectroscopy device, which overcomes the problem of difficult adjustment of the working mode, and can quickly and accurately Adjust the working parameters accurately, improve the repeatability of detection, and obtain the best signal-to-noise ratio under different working parameters
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[0034] Such as figure 1As shown, an adjustable reheating double-pulse laser-induced breakdown spectroscopy device includes a first laser 1, a second laser 2, a frequency doubling generator 3, a delay generator 4, an energy attenuator 5, and real-time monitoring of laser energy System 6 , optical path climbing system 7 , detector 8 , spectroscopic system 9 , sample stage 11 , first focusing lens 12 , second focusing lens 10 , optical fiber collection system 13 , and sample surface imaging system 14 .
[0035] The first laser 1 emits pulsed laser light, passes through the optical system, and hits the sample. When the energy density is higher than the excitation threshold, plasma is formed. The laser generated by the second laser 2 reheats the plasma, and the plasma cools and emits different wavelengths. The characteristic spectral lines are collected by the optical fiber collection system 13, passed through the spectroscopic system 9, detected by the detector 8, and displayed on...
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Abstract
The invention discloses an adjustable reheating double pulse laser-induced breakdown spectroscopy device. The device comprises a first laser device, a second laser device, a time delay generator and a sample table, wherein an optical path raising system is arranged in the optical path of the first laser device and used for raising the optical path of the first laser device so that first laser can be focused onto the surface of a sample from a position right above the sample table to generate plasmas; the time delay generator is used for controlling the trigger timing of the first laser device and the second laser device; a frequency doubler is arranged in the optical path of the second laser device, and second laser penetrating through the frequency doubler is used for reheating the plasmas. The device further comprises a signal acquiring and processing system which is capable of displaying the distribution information of elements on the surface of the sample according to the characteristic spectral lines emitted by plasma cooling and the space information of the first laser striking the sample. The adjustable reheating double pulse laser-induced breakdown spectroscopy device realizes a double pulse laser-induced breakdown spectroscopy reheating working mode and creates conditions for strengthening the element content detection signals of fragile samples (such as biological samples).
Description
technical field [0001] The invention relates to the technical field of laser spectroscopy, in particular to an adjustable reheating double-pulse laser-induced breakdown spectroscopy device. Background technique [0002] LIBS is the abbreviation of Laser-Induced Breakdown Spectroscopy (Laser-Induced Breakdown Spectrometer). The emitted spectrum is used to identify the elemental composition in the sample, and then the identification, classification, qualitative and quantitative analysis of materials can be carried out. This technology does not require sample pretreatment, and can quickly realize remote and micro-destructive detection of sample elements (especially metal elements), and can be used for the detection of solid, gas, and liquid samples. Laser-induced breakdown spectroscopy is also used in a wide range of fields, such as biomedicine, archaeology, environmental monitoring, heavy metal detection in water, and explosive detection. [0003] Compared with single-pulse ...
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IPC IPC(8): G01N21/71
Inventor 何勇彭继宇刘飞张初余克强方慧
Owner ZHEJIANG UNIV