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On-line in situ detecting method for infrared-ultraviolet double pulse laser induced breakdown spectroscopy

A laser-induced breakdown and in-situ detection technology, applied in the direction of material excitation analysis, can solve the problems of low plasma temperature and density, high detection limit, low analytical sensitivity, etc., to improve sensitivity, prolong relaxation time, Enhances the effect of spectral radiant intensity

Inactive Publication Date: 2012-06-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

The temperature and density of the plasma excited by single-pulse LIBS are low, and the intensity of the emission spectrum formed is limited, so the analytical sensitivity is relatively low and the detection limit is relatively high

Method used

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  • On-line in situ detecting method for infrared-ultraviolet double pulse laser induced breakdown spectroscopy
  • On-line in situ detecting method for infrared-ultraviolet double pulse laser induced breakdown spectroscopy
  • On-line in situ detecting method for infrared-ultraviolet double pulse laser induced breakdown spectroscopy

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Embodiment

[0050] Embodiment: Figures 1 to 3 show the structure of the detection device used in the detection method of the present invention. The core components include infrared band laser 1 (take 1064nm Nd:YAG nanosecond pulse laser as an example); ultraviolet band laser 2 (take 193nm ArF excimer nanosecond pulse laser as an example); pulse delay controller 3; the first beam remote Convergence adjustment device 4; second beam remote convergence adjustment device 5; spectrum remote receiving device 6; seven-channel high-resolution micro-optical fiber 7; full-band laser-induced attenuation spectrometer 8; and computer 9, etc.

[0051] like Figure 4 Shown is a flow chart of an infrared-ultraviolet double-pulse laser-induced breakdown spectroscopy online in-situ detection method according to the present invention, which includes the following steps:

[0052] The first step is to set the delay time of the pulse delay controller 3 according to the excitation characteristics of the sample t...

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Abstract

The invention discloses an on-line in situ detecting method for an infrared-ultraviolet double pulse laser induced breakdown spectroscopy, which at least comprises the following steps of: A. setting a pulse delay time according to the sample excitation characteristics to control the time interval of two lasers; B. firstly outputting laser from an infrared waveband laser, long-distance collecting, adjusting and focusing on a position to be detected, and ablating the sample to generate plasma; C. outputting laser from an ultraviolet waveband laser after a delay time, long-distance collecting, adjusting and focusing on the same position, and exciting the plasma to reinforce a spectrum signal; D. receiving the spectrum signal through a long-distance spectrum collecting device, coupling the spectrum signal in an optical fiber, transmitting the spectrum signal to a spectrograph, and obtaining the spectrum data information through an assorted software; E. collecting the spectrum data, and obtaining a detection ingredient analysis result by a calibration-free correction analysis method.

Description

technical field [0001] The invention can meet the strict requirements of on-line in-situ detection, is widely applicable to multiple technical fields such as analysis, detection, measurement and diagnosis, and specifically relates to an on-line in-situ detection method of infrared-ultraviolet double-pulse laser-induced breakdown spectroscopy. Background technique [0002] On-line in-situ detection technology is a new and important part of modern detection technology. It can quickly, conveniently and effectively detect the performance of materials in in-service equipment, and discover the damage of in-service structures and vulnerable parts. It is the key to preventing accidents and ensuring equipment Effective means of operational security. The technical difficulties of in-situ testing are mainly manifested in the following aspects: on the one hand, the testing site conditions are harsh and cannot be compared with ideal conditions such as laboratories; on the other hand, the...

Claims

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Application Information

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IPC IPC(8): G01N21/63
CPCG01N21/718
Inventor 王宏北李聪丁洪斌罗广南
Owner DALIAN UNIV OF TECH
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