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A device and method for microwave-assisted excitation to suppress the self-absorption effect of laser-induced breakdown spectrum

A laser-induced breakdown and self-absorption effect technology, applied in the field of plasma emission spectroscopy, can solve the problems of OPO wavelength tunable lasers such as expensive, cumbersome operation, and difficult maintenance, so as to simplify the process of loading samples and avoid self-absorption , Improve the effect of accuracy and precision

Active Publication Date: 2020-02-14
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method eliminates the self-absorption effect from the intrinsic physical characteristics of the plasma compared to the traditional self-absorption effect correction method, however, this method has the following two deficiencies. One is that the method can only The self-absorption of one spectral line of one element is suppressed, and the efficiency is low; the second is that the OPO wavelength tunable laser used is expensive, large in size, cumbersome to operate, and requires constant temperature and humidity in the environment, resulting in difficult maintenance

Method used

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  • A device and method for microwave-assisted excitation to suppress the self-absorption effect of laser-induced breakdown spectrum
  • A device and method for microwave-assisted excitation to suppress the self-absorption effect of laser-induced breakdown spectrum
  • A device and method for microwave-assisted excitation to suppress the self-absorption effect of laser-induced breakdown spectrum

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Embodiment 1

[0045] In this embodiment, the method is described in detail by taking the detection of sodium element in a sodium chloride powder tablet sample as an example.

[0046] The laser 1 used in this experiment is Leibao Vlite-200Nd:YAG laser, the laser wavelength is 1064nm, the laser energy is 40mJ, and the laser repetition frequency is 1Hz. The integration time of the device 9 is 2ms, the delay time is 2us, and the average is 2 times; the power of the microwave generator 15 is 120W.

[0047] In the first step, the sodium chloride powder is made into a disc with a diameter of 40 mm and a thickness of 4 mm by a tablet machine under a pressure of 20 MPa. After placing the sample, adjust the optical path so that the focus position of the converging lens 4 is located at 4 mm below the sample;

[0048] In the second step, the microwave probe is positioned 2 mm above the sample surface, and a microwave probe with a double-needle structure is used. The distance between the double needles ...

Embodiment 2

[0053] In order to verify whether the present invention has the effect of simultaneously inhibiting the self-absorption of multiple elements, this embodiment takes the simultaneous detection of sodium and potassium in a potassium feldspar (GBW03116) tablet sample as an example to describe the method in detail.

[0054] The laser 1 used in this experiment is Leibao Vlite-200Nd:YAG laser, the laser wavelength is 1064nm, the laser energy is 40mJ, and the laser repetition frequency is 1Hz. The integration time of the device 9 is 2ms, the delay time is 2us, and the average is 2 times; the power of the microwave generator 15 is 100W.

[0055] In the first step, the potassium feldspar powder is made into a disc with a diameter of 40mm and a thickness of 4mm by a tablet machine under a pressure of 20MPa. After placing the sample, adjust the optical path so that the focal position of the converging lens 4 is located at 4mm below the sample, and then open the The pulse laser outputs a l...

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Abstract

The invention discloses a device and a method for restraining a self-absorption effect of a laser induced breakdown spectrometry by utilizing microwave-assisted stimulation. The device comprises a pulse laser, a convergent lens, a spectrograph, a photoelectric detector, a computer, a three-dimensional displacement platform, a microwave probe and a microwave generator. The invention utilizes the excellent penetrability of the microwave-assisted stimulation to simultaneously stimulate the base particles of almost all the elements in plasma, avoid the self-absorption for central similar emission spectra, restrain and eliminate the self-absorption effect of the plasma from the source, so as to promote the accuracy and precision of laser induced breakdown spectrometry quantitative analysis. According to the invention, microwave is adopted for assisting the laser induced breakdown spectrometry, the microwave energy is radiated to laser plasma through a probe near field, no sealing chamber is required, a sample loading process is simple and the advantages of quick, in situ, real-time, multi-element and remote analysis of the laser induced breakdown spectrometry under atmospheric environment are remained.

Description

technical field [0001] The invention relates to the field of plasma emission spectrum analysis, in particular to a device and method for microwave-assisted excitation to suppress the self-absorption effect of laser-induced breakdown spectrum. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS for short) is a kind of element spectrum detection and analysis technology. The basic principle is to use a beam of high-energy pulsed laser to focus on the surface of the sample to be tested, ablate to generate laser plasma, and obtain the element types and concentrations of the sample to be tested according to the wavelength and intensity of the plasma emission spectrum. Compared with traditional analytical techniques, laser-induced breakdown spectroscopy has many inherent advantages, such as a wide range of elemental analysis samples, simple sample pretreatment, in-situ real-time, remote detection, etc. Therefore, laser-induced breakdown spectroscopy has become...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/71
CPCG01N21/718
Inventor 郭连波唐云李嘉铭杨新艳李祥友曾晓雁陆永枫段军
Owner HUAZHONG UNIV OF SCI & TECH
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