Concentric multipath cavity enhanced laser-induced breakdown spectroscopy high-sensitivity detection device and method
A laser-induced breakdown and sensitive detection technology, applied in the application field of laser spectroscopy technology, can solve problems such as the inability to meet industry requirements, and achieve the effect of low detection limit and enhanced spectral line signal.
Active Publication Date: 2020-12-25
SHANXI UNIV
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Problems solved by technology
Although the application of double pulse can reduce the detection limit of elements by 2~14 times compared with the case of single pulse, it still cannot meet the requirements of some industries
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[0013] Such as figure 1 As shown, under the control of the digital delay pulse generator 1, the first laser 2 and the second laser 3 respectively output the same frequency laser light at intervals of -10~10 microseconds. Among them, the laser output by the laser 2 is vertically focused on the surface of the sample 9 through the reflector 5 and the first concentrating system 6, and the sample is ablated to generate plasma, which is called ablation laser; the laser pulse output by the laser 3 passes through the second concentrating system 4 Inject into the concentric multipath cavity 8 perpendicular to the convergence direction of the ablation laser, and focus at 0-2.5mm above the laser ablation point, the specific height depends on the size of the plasma generated by the ablation laser, the concentric multipath cavity The center height corresponds to this. The micro-negative pressure dust suppression device may or may not be used, and its essence is a vacuum aspirator.
[001...
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The invention belongs to the field of the laser spectrum technology application. A high-sensitivity trace-element detection device of the laser-induced breakdown spectrum comprises a first laser (2) and a second laser (3) connected with a digital delay pulse generator (1), a laser pulse reflector (5) located at a laser emission direction of the first laser (2), a first light condensation device (6), a second light condensation device (4), a homocentric multipath cavity (8), an optical fiber and a spectrograph (10). The invention further relates to a high-sensitivity trace-element detection method of the laser-induced breakdown spectrum. The homocentric multipath cavity is coupled to a laser path parallel to a sample, the beam of laser is repeatedly reflected and converged nearby a sample ablation point, and the residual laser energy in the orthogonal dual-pulse breakdown process is recycled so as to effectively enhance a spectrum line signal and reaching lower detection limit.
Description
technical field [0001] The invention belongs to the application field of laser spectrum technology, and in particular relates to a concentric multipath cavity enhanced laser-induced breakdown spectrum high-sensitivity detection device and detection method. Background technique [0002] Statistics show that as of 2017, my country's strategic crude oil reserves can only last for 32 days, far below the 90-day safety standard set by the International Energy Agency. my country is rich in coal resources, and using coal to supplement the gap in crude oil reserves has become an urgently needed technology for my country's strategy. At present, my country has made major breakthroughs in coal chemical technology such as coal-to-oil and coal-to-olefins. In the specific process, it is necessary to conduct a rapid analysis of all elements of raw coal, such as detecting trace elements such as As and Na in coal to prevent reaction catalysts. Poisoning and inactivation, the existing coal qua...
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IPC IPC(8): G01N21/71
CPCG01N21/718
Inventor 白禹张雷尹王保肖连团贾锁堂
Owner SHANXI UNIV