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Non-standard-sample calibration method adopting femtosecond plasma channel breakdown spectroscopy

A technology of plasma and breakdown spectroscopy, applied in the field of element detection, can solve the problems of matrix effect, low detection sensitivity, difficult calibration, etc., and achieve the effect of small pulse width, overcoming mutual interference, and enhancing spectral signal.

Inactive Publication Date: 2019-06-14
GUANGDONG ROI OPTOELECTRONICS TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is used for sample monitoring and can be used for laser-induced breakdown spectroscopy analysis with simple or no processing of the sample, but there are problems of low detection sensitivity and obvious influence of matrix effect, which lead to difficult calibration

Method used

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  • Non-standard-sample calibration method adopting femtosecond plasma channel breakdown spectroscopy
  • Non-standard-sample calibration method adopting femtosecond plasma channel breakdown spectroscopy
  • Non-standard-sample calibration method adopting femtosecond plasma channel breakdown spectroscopy

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Experimental program
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Effect test

Embodiment 1

[0060] figure 1 It is the schematic diagram of the breakdown spectrum induced by femtosecond optical fiber or femtosecond plasma grating. The principle of the method is as follows figure 1 As shown, a beam of femtosecond pulsed laser is directly focused to form a filament-like plasma channel, or two beams of filaments formed after beam splitting, time-domain synchronization, and focusing interact with each other to form a plasma grating with spatial period modulation The structure acts on the sample to be tested, excites the sample to be tested, and obtains the plasma breakdown fluorescence transition spectrum, thereby realizing the detection of the elements in the sample.

[0061] figure 2 Schematic diagram of the breakdown spectrum structure of the femtosecond plasma grating. The structure of the detection device includes a laser 1, a beam splitting module 2, a time domain synchronization module 3, a focusing module 4, an object carrying module 5, and a spectrum collection mod...

Embodiment 2

[0063] Weigh 0.2 g of several soils with different chromium element concentrations and press them with a hydraulic press at a pressure of 4 MPa for 1 minute to obtain soil compacts with a diameter of 13 mm for testing. A single-pulse energy of 60mJ and a nanosecond laser pulse with a repetition frequency of 5Hz was focused on the surface of the soil sample tablet to test the spectral signal intensity of chromium in the soil.

[0064] image 3 The relationship between the signal intensity of 427.4nm spectral line of chromium and the concentration of chromium in different soils tested. It can be seen that the traditional method of direct compression and nanosecond laser testing of the element signal intensity and concentration relationship of different soils is basically inconsistent, indicating that there is an obvious matrix effect in the test at this time, which will make it impossible to determine the soil elements. Cannot be quantitatively tested.

Embodiment 3

[0066] Weigh 0.2 g of several soils with different chromium element concentrations and press them with a hydraulic press at a pressure of 4 MPa for 1 minute to obtain soil compacts with a diameter of 13 mm for testing. The femtosecond laser pulse with a single pulse energy of 0.3 mJ and a repetition frequency of 1 kHz was focused on the surface of the soil sample tablet to test the spectral signal intensity of chromium in the soil.

[0067] Figure 4 The relationship between the signal intensity of 427.4nm spectral line of chromium and the concentration of chromium in different soils tested. It can be seen that although the relationship between the signal intensity and concentration of the element signal in different soils is not consistent enough with the femtosecond laser to directly press the tablet, it has shown a certain linear correlation, indicating that the femtosecond laser at this time has already begun to weaken the suppression matrix effect. Effective.

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Abstract

The invention relates to the technical field of element detecting, in particular to a non-standard-sample calibration method adopting a femtosecond plasma channel breakdown spectroscopy. The calculation method includes the following steps that A1, a femtosecond pulse laser transmitted by a laser transmitting module passes a focusing module to form multi-beam femtosecond chevilled silks; A2, an X element with known concentration is added on a sample selected from to-be-tested samples, the femtosecond chevilled silks are used for acting on the sample added with the X element, and relation of spectral line signal strength and concentration of the X element in the to-be-tested sample is obtained; and A3, tested spectral line signal strength of the X element and concentration of the X element in a characteristic spectral line signal of the to-be-tested samples are combined, thus universal relation of spectral line signal strength and concentration of the X element in the to-be-tested samplecan be obtained, and non-standard-sample calibrating is realized, wherein the characteristic spectral line signal of the sample in the step A2 does not contain a characteristic signal of the X element. According to the non-standard-sample calibration method adopting the femtosecond plasma channel breakdown spectroscopy, the matrix effect can be overcome, and non-standard-sample concentration calibrating for testing elements is realized.

Description

Technical field [0001] The invention relates to the technical field of element detection, in particular to a calibration method for femtosecond plasma channel breakdown spectra without a standard sample. Background technique [0002] In recent years, there has been an increasing demand for the detection of common sample elements, such as the detection of heavy metal elements in water and soil to monitor and treat heavy metal pollution, and the detection of various elements in organic matter such as vegetables and tea to evaluate their effects. The effects of ingestion are good or bad. [0003] Taking the most common and most serious soil as an example, soil heavy metal pollution refers to the phenomenon that human activities bring heavy metals into the soil, causing the content of heavy metals in the soil to be significantly higher than its natural background value, and causing ecological damage and deterioration of environmental quality. Heavy metal pollutants mainly refer to ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/74G01N21/71
Inventor 曾和平牛盛
Owner GUANGDONG ROI OPTOELECTRONICS TECH CO LTD
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