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Method for improving detection precision of portable LIBS (laser-induced breakdown spectroscopy) equipment

A kind of equipment testing and portable technology, applied in the direction of material excitation analysis, thermal excitation analysis, etc., can solve the problems of clumsy and abrupt overall design of the instrument, inconvenient use, high cost of consumables, etc., achieve long continuous working time, easy to hold, and make up for the performance Falling effect

Pending Publication Date: 2022-04-12
HANGZHOU PUYU TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cost of consumables is high, it is inconvenient to use, and at the same time makes the overall design of the instrument clumsy and abrupt, such as Thermofisher products, 3kg mid-external gas cylinders, like a big tail

Method used

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  • Method for improving detection precision of portable LIBS (laser-induced breakdown spectroscopy) equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] figure 1 A flow chart of a method for improving the detection accuracy of a portable LIBS device in an embodiment of the present invention is schematically given, as figure 1 Shown, the method for described improving portable LIBS equipment detection accuracy is:

[0029] Use portable LIBS equipment to excite various types of standard samples, such as iron-based sample RE12, the magnetic field generated by the electromagnet confines the plasma generated on the standard sample, and obtain the spectra respectively;

[0030] Select the spectral peaks of multiple elements (elements to be detected in the same type of sample to be tested) in the spectrogram, select at least two spectral peaks for each element, and calculate the sum of the signal-to-noise ratios of the selected spectral peaks;

[0031] Adjust the current value of the electromagnet so that when the intensity of each spectral peak is less than the peak intensity threshold, the sum of the signal-to-noise ratio i...

Embodiment 2

[0050] An application example of the method for improving the detection accuracy of a portable LIBS device according to Embodiment 1 of the present invention.

[0051] In this application example, in the casing, the gas cylinder and the light source are arranged side by side, the spectrometer is disposed on the lower side of the light source and the gas cylinder, and the analysis unit is disposed on the rear side of the gas cylinder and the light source; the decompression module, the solenoid valve and the The flow sensors are set in sequence and are located between the light source and the gas cylinder; the outlets of the decompression module are respectively connected to two solenoid valves, and the outlets of each solenoid valve are connected to the flow sensor and the gas outlet in turn; the hollow handle is arranged obliquely on the housing On the lower side of the handle, the battery is arranged in the handle to supply power for the light source, the spectrometer, the ana...

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Abstract

The invention provides a method for improving the detection precision of portable LIBS (laser-induced breakdown spectroscopy) equipment, which specifically comprises the following steps: exciting various types of standard samples by using the portable LIBS equipment, constraining plasmas generated on the standard samples by a magnetic field generated by an electromagnet, and respectively obtaining spectrograms; spectral peaks of various elements in the spectrogram are selected, at least two spectral peaks are selected for each element, and the sum of signal-to-noise ratios of the selected spectral peaks is calculated; the current value of the electromagnet is adjusted, so that the sum of the signal-to-noise ratios is maximum under the condition that the intensity of each spectrum peak is smaller than a peak intensity threshold value, and a mapping relation between the type of the standard sample and the current value of the electromagnet corresponding to the standard sample is established and stored; obtaining the type of a to-be-tested sample, and obtaining a target current value of the electromagnet by using the mapping relation; the portable LIBS equipment is used for exciting the to-be-detected sample, the current of the electromagnet is adjusted to the target current value, and therefore the content of the elements in the to-be-detected sample is obtained. The method has the advantages of high detection precision and the like.

Description

technical field [0001] The invention relates to elemental analysis, in particular to a method for improving detection accuracy of portable LIBS equipment. Background technique [0002] At present, due to the influence of shape, volume, and weight, the portable LIBS equipment is inferior to the desktop LIBS equipment in terms of repeatability, detection limit, and accuracy, and needs to be further improved in terms of performance. [0003] The existing methods to improve the detection accuracy of portable LIBS equipment mainly include algorithmic processing of collected LIBS spectra, including budget methods such as baseline correction, filtering, and overlapping peak decomposition, and quantitative methods such as principal component analysis, support vector machines, and free calibration methods. Analysis algorithm, these methods can improve the detection accuracy to a certain extent, but the improvement effect is limited. When the spectral intensity is too low, this type o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
Inventor 鲁佳哲俞晓峰喻正宁王庆祥徐桔红陈春霖
Owner HANGZHOU PUYU TECH DEV CO LTD
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