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Method and device for detection of femtosecond plasma breakdown ionization spectrum

A plasma and spectral detection technology, which is applied in the field of element detection, can solve the problem of no strong background spectrum, etc., and achieve the effect of overcoming adverse effects, improving sensitivity, and improving sensitivity

Active Publication Date: 2019-07-26
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

[0006] In addition, the traditional nanosecond laser-induced breakdown spectrum has a strong continuous background fluorescence spectrum caused by inverse bremsstrahlung, which will cover the target signal spectrum. Compared with this, femtosecond filament or plasma grating excited plasma has no strong The background spectrum has a higher free electron density, which plays a great role in improving the excitation test signal of the spectrum and overcoming the matrix effect.

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  • Method and device for detection of femtosecond plasma breakdown ionization spectrum
  • Method and device for detection of femtosecond plasma breakdown ionization spectrum
  • Method and device for detection of femtosecond plasma breakdown ionization spectrum

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Embodiment 1

[0038] Such as figure 1 As shown, a device for spectral detection of femtosecond plasma breakdown ionization includes a graphite heating device 5, a sample cavity 6 and a detection module. The detection module includes a laser emission module 1, a focusing The module 4 and the spectrum collection and detection module 7, the graphite heating device 5, the focusing module 4 and the spectrum collection and detection module 7 are connected to the sample chamber 6 respectively. A beam splitting module 2 and a time domain synchronization module 3 are arranged in sequence between the laser emitting module 1 and the focusing module 4 along the laser emitting path.

[0039] The outgoing light of the laser emitting module 1 is divided into two laser beams with an energy ratio of 1:1 by the beam splitting module 2. After passing through the optical path synchronization module 3, it is focused into filaments by the focusing module 4, and the two laser beams are adjusted to intersect in sp...

Embodiment 2

[0042] A method for spectral detection of femtosecond plasma breakdown ionization, adjusting the temperature of the graphite heating device 5 to 2000°C, placing the soil sample to be tested in it, and after ashing and atomization, the soil atomization gas is formed and injected into the In the sample cavity 6; split the femtosecond laser pulse with a single pulse energy of 1.6mJ and a repetition rate of 1kHz through a 1:1 beam splitter, and then adjust the optical path synchronization of the two pulses to form an optical filament through the same focusing lens. Adjust the spatial intersection to form a plasma grating, apply the grating to the sample cavity for excitation, and use a high-resolution spectrometer to collect lateral fluorescence. The test spectrum is as follows: image 3 As shown, the detection characteristic lines of several typical metal elements can be clearly seen, such as magnesium element 285.2nm, calcium element 422.7nm, sodium element 589.0nm, potassium ele...

Embodiment 3

[0044] Adjust the temperature of the graphite heating device to 3000°C, place the soil sample to be tested in it, and after ashing and atomization, the atomized soil gas is formed and injected into the sample chamber; the femtosecond The laser pulse is split by a beam splitter of 1:1, and then the optical path of the two pulses is adjusted to be synchronized to form a filament through the same focusing lens, and the spatial intersection is adjusted to form a plasma grating, and the grating acts on the sample cavity for excitation. At the same time, a high-resolution spectrometer is used for lateral fluorescence collection, and the test spectrum is as follows: Figure 4 As shown, the detection characteristic lines of several typical metal elements can be clearly seen, such as magnesium element 285.2nm, calcium element 422.7nm, sodium element 589.0nm, potassium element 769.9nm, silicon element 288.2nm, etc., which have very good SNR.

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Abstract

The invention relates to the technical field of element detection, in particular to a method and device for detection of a femtosecond plasma breakdown ionization spectrum. The method for the detection of the femtosecond plasma breakdown ionization spectrum comprises the following steps: (1) putting a to-be-detected sample into a graphite heating device, introducing a current to produce high temperature for enabling the to-be-detected sample to be particlized, and injecting a particlized to-be-detected sample gas into a sample chamber; (2) focusing transmitted femtosecond pulse lasers into plasma, and enabling the plasma to act on the to-be-detected sample gas in the sample chamber and performing excitation, thus a plasma fluorescence spectrum is formed; and (3) acquiring the plasma fluorescence spectrum and performing detection by adopting a spectrum collection detection module. The method provided by the invention performs simple treatment on substances by adopting the graphite heating device, thus particlization efficiency is high; temperature of the substances is high after being subjected to pretreatment, thereby being more beneficial to follow-up excitation detection, and matrix effect is greatly overcome; and the problem that a background signal is high when the traditional nanosecond LIBS system detects an initial stage of plasma evolution is solved.

Description

technical field [0001] The invention relates to the technical field of element detection, in particular to a method and device for spectral detection of femtosecond plasma breakdown ionization. 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 control heavy metal pollution, and the detection of various elements in organic matter such as vegetables and tea to evaluate their impact on The effects of ingestion on the human body are good and bad. [0003] Traditional material analysis and detection usually adopts the method of sampling and processing with laboratory chemical reagents and analyzing with spectroscopic instruments. Although these methods have high detection accuracy, the traditional methods have a long detection cycle and cannot perform rapid and real-time detection, and chemical reagents are prone to secondar...

Claims

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Application Information

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IPC IPC(8): G01N21/64G01N21/73
CPCG01N21/6402G01N21/73
Inventor 曾和平牛盛
Owner GUANGDONG ROI OPTOELECTRONICS TECH CO LTD
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