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Method and device for detecting femtosecond plasma raster induced breakdown spectra

A plasma and induced breakdown technology, applied in material excitation analysis, thermal excitation analysis, etc., can solve the problems of weakening the target signal spectrum, limiting the detection sensitivity, masking the target signal spectrum, etc., to achieve a wide detection range and improve detection sensitivity. , the effect of spectral signal enhancement

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

AI Technical Summary

Problems solved by technology

There is strong inverse bremsstrahlung in the early stage of plasma evolution generated by nanosecond pulse laser excitation, which leads to strong continuous background noise in the fluorescence spectrum, which will cover the target signal spectrum; delaying the acquisition of signals can solve the influence of the strong continuum, but also It will lead to the weakening of the target signal spectrum and reduce the final detection sensitivity; femtosecond pulsed laser excitation has no strong background spectrum, but the balance between the Kerr self-focusing effect and the plasma self-defocusing effect in the pulse laser drawing process, the formation of filaments will There is a certain clamping power, focusing on the sample surface cannot effectively increase the density of excited free electrons, resulting in that the signal spectral intensity cannot be effectively increased with the increase of laser intensity, thus limiting the improvement of detection sensitivity

Method used

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  • Method and device for detecting femtosecond plasma raster induced breakdown spectra
  • Method and device for detecting femtosecond plasma raster induced breakdown spectra
  • Method and device for detecting femtosecond plasma raster induced breakdown spectra

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The femtosecond laser pulse with a single pulse energy of 1.6mJ and a repetition rate of 1kHz is split through a 1:1 beam splitter, and then the two pulses are adjusted to synchronize the optical path and pass through the same focusing lens to form a filament, and the spatial intersection is adjusted to form a plasma Volume grating, the grating is applied to the surface of the soil sample, and argon is blown in the action area for testing, and the air environment is also tested for comparison; at the same time, the light pulses under the same conditions are not subjected to beam splitting interference, and a single beam is directly formed into a filament in the air. The effect of the environment is tested as a comparison.

[0042] image 3 For the detection results that the present invention is used in the above several situations, the same femtosecond pulse as shown in the figure, the signal strength of the excitation test after the beam splitting and synchronous inter...

Embodiment 2

[0044] The femtosecond laser pulse with a single pulse energy of 2.3mJ and a repetition rate of 1kHz is split by a 1:1 beam splitter, and then the two beams are adjusted to synchronize the optical path and pass through the same focusing lens to form a filament, and the space is adjusted to form a plasma. Volume grating, the grating is applied to the surface of the soil sample, and neon gas is blown in the action area for testing, and the air environment is also tested for comparison; at the same time, the light pulses under the same conditions are not subjected to beam splitting interference, and a single beam is directly formed into a filament in the air. The effect of the environment is tested as a comparison.

[0045] Figure 4 For the detection results that the present invention is used in the above several situations, the same femtosecond pulse as shown in the figure, the signal strength of the excitation test after the beam splitting and synchronous interference is much ...

Embodiment 3

[0047] Such as figure 2 Said, a femtosecond plasma grating induced breakdown spectrum detection device structure includes a laser emitting module 1, a beam splitting module 2, a time domain synchronization module 3, a focusing module 4, an object module 5, an auxiliary gas module 6, and a spectrum collection module Module 7, 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, and then focused into filaments by the focusing module 4 after passing through the optical path synchronization module 3 to adjust the space between the two laser beams Intersect, by adjusting the optical path synchronization module 3 to adjust the optical path of the two laser beams to be the same and then interfere to form a plasma grating, the plasma grating acts on the surface of the sample 8 placed on the loading module 5, and the effect is given by the auxiliary gas module 6 The area provides different types o...

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Abstract

The invention relates to the technical field of element detection, in particular to a method and device for detecting femtosecond plasma raster induced breakdown spectra. A space periodically modulated plasma raster is formed after femtosecond pulses are separated, synchronized in time domain and focused, and the plasma raster induced breakdown spectra are used for detecting samples to be detected. According to the method, the plasma raster in ultrafast optics is combined with laser-induced breakdown spectroscopy (LIBS), so that the incomparable advantages of the LIBS technology such as real-time, fast, micro-damage and all-element analysis are retained, the limitation of a single-beam femtosecond filament clamping power is overcome to a certain extent, the free electron density is improved, and thus the signal intensity of elements and the detection sensitivity are improved.

Description

technical field [0001] The invention relates to the technical field of element detection, in particular to a method and device for detection of femtosecond plasma grating-induced breakdown spectroscopy. 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...

Claims

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Application Information

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IPC IPC(8): G01N21/73G01N21/71
CPCG01N21/718
Inventor 曾和平牛盛
Owner GUANGDONG ROI OPTOELECTRONICS TECH CO LTD
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