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Optoacoustic type laser breakdown detection device

A technology of laser breakdown and detection device, which is applied in the field of spectral measurement, can solve the problems of indistinguishable spectral lines, decreased detection sensitivity, low detection sensitivity, etc. Effect

Active Publication Date: 2015-09-16
NANJING INST OF ADVANCED LASER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The detection limit of the current laser-induced breakdown spectroscopy method is on the order of ppm, and there is a problem of low detection sensitivity.
The use of photoacoustic spectroscopy to detect gases has a detection sensitivity of ppb or even ppt levels, but if the solid substance is directly detected, the detection sensitivity will decrease due to spectral line broadening and the spectral lines will be difficult to distinguish

Method used

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  • Optoacoustic type laser breakdown detection device
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  • Optoacoustic type laser breakdown detection device

Examples

Experimental program
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Effect test

Embodiment 1

[0026] figure 2 Shown is the overall structure of the detection device. The signal detected by the micro-sound detector 5 is amplified by the preamplifier 6-1. The function of the chopper 4 is to provide a modulation signal to the detection light source 3, and periodically modulate the detection light source 3. output light frequency. The signals of the preamplifier 6-1 and the chopper 4 are simultaneously input into the lock-in amplifier 6-2, and the signal of the lock-in amplifier 6-2 is output to the host computer 7 for data collection, and the host computer 7 is also connected with the light source controller 1 simultaneously. It is connected with the light source controller 2, and the switching time of the two light sources can be controlled through the light source controller.

[0027] Figure 1a and 1b Shown is the specific structure of the photoacoustic absorption cavity 1, wherein opposite incident windows 1-1 and exit windows 1-2 are embedded at both ends of the p...

Embodiment 2

[0040]The basic structure of the device is the same as in Example 1. When the content of Fe needs to be detected, because the absorption line of Fe is 248.7nm, the detection light source 3 can be changed to a tunable alexandrite laser (Cr 3+ :BeAl 2 o 4 ), the third harmonic band of the alexandrite laser is 240-270nm, and the laser (third harmonic) emitted by the alexandrite laser is absorbed by the Fe molecules in the nanoparticle cloud to produce a photoacoustic effect.

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Abstract

The invention provides an optoacoustic type laser breakdown detection device which comprises a detection light path system and an electric system, wherein the detection light path system comprises an optoacoustic absorption cavity, an excitation light source and a detection light source; a sample pond and a microphonic detector are arranged in the optoacoustic absorption cavity; when the device works, a to-be-measured substance is arranged in the sample pond, the excitation light is focused to enter the to-be-detected substance, the to-be-detected substance forms a nano particle cloud cluster which is diffused into the cavity, the detection light source enters the optoscoustic pond to be absorbed by the components in the nano particle cloud cluster so as to generate the optoacoustic effect, the content of the substances in the cloud cluster can be calculated by the sound wave strength detected by the microphonic detector, and further, the content of a certain component in the to-be-detected substance can be calculated. The optoacoustic absorption cavity is subjected to vacuum pumping during work, the excited nano particle cloud cluster is diffused in the cavity, and the pressure is small, so that the spectral line broadening effect is small, the detected spectral line can be easily distinguished from other spectral lines, the noise is low in the low-pressure state, and the optoacoustic type laser breakdown detection device has high sensitivity.

Description

technical field [0001] The invention relates to the technical field of spectrum measurement, in particular to a laser-induced breakdown detection device using photoacoustic spectroscopy, which is suitable for quantitative analysis of substance concentration. Background technique [0002] Laser-induced breakdown spectroscopy is a laser ablation spectroscopic analysis method. The laser is focused on the substance to be measured (which can be solid, liquid or gas) through a lens. When the energy density of the laser is greater than the breakdown threshold of the sample to be measured, first A cloud of nanoparticles will be generated, and the laser will continue to irradiate to generate plasma. The local energy density and temperature of this plasma are very high. Use a spectrometer to collect the signal of the emission line generated on the plasma surface of the sample to be tested, and then the emission line can be obtained according to the emission Quantitatively analyze the ...

Claims

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Application Information

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IPC IPC(8): G01N21/63
Inventor 王欢陈昱李建春
Owner NANJING INST OF ADVANCED LASER TECH
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