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Method and system for in-situ testing of metal combustion sensitivity characteristics

An in-situ testing and sensitivity technology, applied in the field of spectral detection, can solve the problems of inability to reflect material structure changes, low resolution, poor Raman spectral analysis accuracy, etc., to achieve accurate and reliable Raman spectral line information and improve accuracy. Effect

Active Publication Date: 2021-11-26
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, although the use of photoionization efficiency spectroscopy and infrared spectroscopy can observe the combustion process in situ, it can also reflect the mutation process of ionization energy, but due to the low resolution, it cannot reflect the structural changes of substances; while Raman spectroscopy is a kind of fingerprint Spectrum, which can reflect changes in material structure, but the accuracy of Raman spectrum analysis under high temperature conditions is poor, and the Raman signal at the moment of ignition cannot be accurately obtained, and thus the sensitivity characteristics of metal combustion cannot be analyzed

Method used

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  • Method and system for in-situ testing of metal combustion sensitivity characteristics
  • Method and system for in-situ testing of metal combustion sensitivity characteristics
  • Method and system for in-situ testing of metal combustion sensitivity characteristics

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Embodiment 1

[0067] The system used includes: sample stage, high-temperature plasma spray gun, dual colorimetric infrared thermometer, short-wavelength pulsed laser light source, Raman probe, Raman signal processing device, digital time-delay signal generator, and high-speed infrared photography device.

[0068] A method for in situ testing of metal combustion susceptibility characteristics includes the following steps.

[0069] The metal sample of pure titanium is fixed on the sample stage and placed in air with a pressure of 0.10 MPa. A short-wavelength pulsed laser light source is used to emit short-wavelength pulsed laser light on the surface of the metal sample, and a dual-colorimetric infrared thermometer and a Raman probe are used to calibrate the pure titanium of the metal sample, so that the dual-colorimetric infrared thermometer The position of temperature measurement, the position of short-wavelength pulse laser irradiation and the position of Raman signal acquisition are the sa...

Embodiment 2-15

[0075] With reference to the device and method of Example 1, the metal sample, gas type, pressure, heating method, maximum heating temperature, heating rate, pulse time and spectrum sampling frequency test conditions in Table 1 were used to test the metal combustion sensitivity characteristics in situ. Among them, the metal samples of Examples 13-15 are placed in a closed cabin with an observation window, and after the vacuum is exhausted, 0.09MPa, 0.17MPa, and 0.17MPa of pure oxygen are respectively filled to make the metal samples burn under pure oxygen conditions; The metal samples of other embodiments were placed in air with a pressure of 0.10 MPa for combustion.

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Abstract

The invention relates to the technical field of spectrum detection, and provides a method and system for in-situ testing of metal combustion sensitivity characteristics, and the method comprises the following steps: heating a metal sample until combustion; monitoring the surface temperature of the metal sample in the process from heating to combustion ending in real time; irradiating the surface of the metal sample by adopting short-wavelength pulse laser to generate a Raman signal; collecting and processing raman signals of the metal sample in the process from heating to combustion ending, and obtaining a Raman spectrum, wherein the pulse of the short-wavelength pulse laser and the collection of the Raman signal are carried out in a time sequence synchronization mode; and analyzing the surface temperature and the Raman spectrum of the metal sample to obtain the phase change information at the ignition moment, thereby obtaining the metal combustion sensitivity characteristic. According to the method provided by the invention, the influence of the blackbody radiation signal generated by the to-be-detected metal in a high-temperature state on the Raman signal can be effectively removed, the Raman spectrum analysis precision is improved, the Raman signal at the ignition moment is accurately obtained, and then the metal combustion sensitivity characteristic is obtained through analysis.

Description

technical field [0001] The present application relates to the technical field of spectral detection, in particular to a method and system for in-situ testing of metal combustion sensitivity characteristics. Background technique [0002] Metal combustion often occurs under extreme conditions such as high temperature, high pressure, oxygen enrichment, high-speed impact, and high-speed friction. It is different from general oxidation. The moment of ignition is often accompanied by typical sudden changes in temperature, size reduction, and visible light. The essential mechanism of the ignition moment is still unclear, and the ignition mechanism has always been the focus of research. [0003] At present, the methods for studying the combustion process of metals mainly use photoionization efficiency spectroscopy, infrared spectroscopy and Raman spectroscopy. Among them, although the use of photoionization efficiency spectroscopy and infrared spectroscopy can observe the combustio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/12G01N21/01G01N21/65
CPCG01N31/12G01N21/01G01N21/65
Inventor 张诚何康黄进峰王凤平汪从珍李志斌
Owner UNIV OF SCI & TECH BEIJING