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Laboratory detection device and evaluation method for catalytic coefficient of material surface based on LIF detection

A technology of catalytic coefficient and evaluation method, applied in the direction of material excitation analysis, fluorescence/phosphorescence, etc., can solve problems such as the inability to realize independent and precise control of environmental parameters, and a large number of principled experimental researches on the catalytic coefficient of unsuitable materials.

Active Publication Date: 2018-01-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inductively coupled plasma torch device is a high-enthalpy device, which cannot achieve independent and precise control of environmental parameters.
Therefore, the above-mentioned existing experimental devices or methods are not suitable for a large number of principled experimental studies on the catalytic coefficient of materials.

Method used

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  • Laboratory detection device and evaluation method for catalytic coefficient of material surface based on LIF detection
  • Laboratory detection device and evaluation method for catalytic coefficient of material surface based on LIF detection
  • Laboratory detection device and evaluation method for catalytic coefficient of material surface based on LIF detection

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0046] Specific implementation mode 1: This implementation mode provides a laboratory detection device based on laser-induced fluorescence detection of oxygen atoms, such as figure 1 As shown, the detection device includes a laser induction source and a laser incident adjustment optical path 1, a hollow water-cooled stainless steel cavity 2, a high-power fiber-coupled laser 3, an energy meter 5, a radio frequency power supply 6, a fluorescence imaging optical path and an acquisition device 7, a dual ratio Color pyrometer 8 and synchronous triggering device 9, wherein:

[0047] The laser induction source and the laser incident adjustment optical path 1 can emit a laser with a wavelength of 225.6nm and realize the spatial high-precision movement of the incident laser beam;

[0048] The hollow water-cooled stainless steel cavity 2 is an environmental cavity where the catalytic reaction occurs, and the cavity is connected with devices such as a vacuum pump, a flow meter, and a va...

specific Embodiment approach 2

[0056] Embodiment 2: Two-photon laser-induced fluorescence (TALIF) is used to measure the catalytic coefficient of oxygen atoms on the surface of materials, which is based on TALIF to characterize the temperature and relative concentration of oxygen atoms. For the measurement of oxygen atom temperature and concentration, the excitation laser is scanned in a narrow wavelength range (about 20pm). The translational temperature of the oxygen atom is:

[0057]

[0058] Among them, T O is the translational temperature of the oxygen atom, M O is the relative atomic mass of oxygen atom, c is the speed of light in vacuum, k B is the Boltzmann constant, n A is Avogadro's constant, λ 0 is the central wavelength of the Gaussian curve obtained by wavelength scanning, Δλ T,ICP is the full width at half maximum of the Gaussian curve, Δλ L Instrument broadening for lasers. After measurement, the instrument broadening of the laser involved in the present invention is Δλ L = 2.26pm. ...

Embodiment 1

[0095] The plasma discharge power is 1000W, the ambient pressure of the chamber is 10Pa, the oxygen flow rate is 20sccm, the test material is copper (Cu), the sample size is φ12mm×2mm, and the sample is water-cooled to prevent the plasma environment from heating the surface of the material. oxidation. First determine the surface position, and then start from the position with a relative distance of 3.6 mm, and move the laser beam to the sample surface with a displacement of 0.1 mm. The incident wavelength is scanned at each space point to obtain the intensity distribution curve of the oxygen atom fluorescence signal as a function of the wavelength, and then the relative oxygen atom concentration and oxygen atom temperature are obtained. Each space point was tested 5 times and the average value was taken. Finally, according to the atomic mole fraction gradient theory, the surface catalytic reaction rate and catalytic coefficient of Cu material at room temperature are determine...

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Abstract

The invention discloses a laboratory detection device and evaluation method for the catalytic coefficient of a material surface based on LIF detection. The detection device comprises a laser inductionsource, a laser incidence regulating optical path, a hollow water-cooled stainless steel cavity, a high-power fiber-coupled laser, an energy meter, a radio frequency power, a fluorescence imaging optical path, an acquisition device, a dual-colorimetric pyrometer and a synchronous trigger device. According to the invention, in radio frequency inductively coupled plasma, a laser-induced fluorescence spectral diagnosis method is used for non-contact high-precision synchronous in-situ measurement of oxygen atom concentrations, temperature and other information of the material surface, and the catalytic coefficient of oxygen atoms on the material surface is directly obtained through cooperative usage of the atomic molar fraction gradient theory, thereby realizing non-contact accurate in-situ characterization and evaluation of the catalytic coefficient of the material surface under the conditions of different environmental parameters.

Description

technical field [0001] The invention relates to a laboratory detection device and evaluation method for the catalytic coefficient of a material surface based on laser-induced fluorescence (LIF) detection, in particular to a non-contact method for testing and evaluating the surface catalytic properties of high-temperature materials by using laser-induced fluorescence spectrum diagnosis Detection device and method. Background technique [0002] The thermal load that a hypersonic vehicle is subjected to during its service has an important impact on its thermal protection system, and may even become a huge hidden danger to flight safety. When the aircraft enters the dense atmosphere of the earth, the shock wave generated at the front of the aircraft will generate high enthalpy heat flow on the surface of the heat-resistant material, causing the surface temperature of the aircraft to rise sharply, especially for parts such as the nose cone or wing leading edge, the local temperat...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 金华曾庆轩孟松鹤王刘伟许承海
Owner HARBIN INST OF TECH
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