Method for measuring thermophysical parameters of translucent material with transient photothermal signals generated by heating pulse lasers

A technology of translucent materials and thermophysical parameters, which is applied in the direction of material thermal development, color/spectral characteristic measurement, scattering characteristic measurement, etc., and can solve the problems of complex measurement system and low measurement accuracy

Active Publication Date: 2014-01-22
HARBIN INST OF TECH
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Problems solved by technology

[0004] In order to solve the problems of complex measurement system and low measurement accuracy in the existing methods for measuring the absorption coefficient, scattering coefficient and thermal conductivity

Method used

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  • Method for measuring thermophysical parameters of translucent material with transient photothermal signals generated by heating pulse lasers
  • Method for measuring thermophysical parameters of translucent material with transient photothermal signals generated by heating pulse lasers
  • Method for measuring thermophysical parameters of translucent material with transient photothermal signals generated by heating pulse lasers

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specific Embodiment approach 1

[0024] Specific Embodiments 1. A method for measuring the absorption coefficient, scattering coefficient and thermal conductivity of translucent materials using transient photothermal signals generated by pulsed laser heating described in this embodiment. The specific operation steps of the method are:

[0025] Step 1. Make the translucent material to be tested into a flat specimen with a thickness of δ, aim the laser at the center of the left side of the specimen, and make the laser direction perpendicular to the surface of the specimen, and connect two thermocouples to measure the temperature The thermocouple probe on the instrument is fixed on the left and right sides of the specimen;

[0026] Step 2. Turn on the pulse laser to heat the left surface of the specimen with a pulse. At the same time, use a thermocouple thermometer to measure synchronously to obtain the temperature change of the incident surface of the laser on the left side with time as T w1 (t), the change of ...

specific Embodiment approach 2

[0036] Specific embodiment 2. This embodiment is a further description of the method for measuring the absorption coefficient, scattering coefficient and thermal conductivity of translucent materials by using transient photothermal signals generated by pulsed laser heating described in specific embodiment 1. For semi-transparent For transparent materials, the time scale of the heat conduction process is much larger in magnitude than the radiation relaxation time scale, so the calculation of the temperature response of the measured material wall and the hemispherical reflected radiation signal and hemispherically transmitted radiation signal in step 3 is essentially a transient state A coupled solution problem for the heat conduction differential equation and a steady-state radiative transfer equation. Other steps are the same as the specific implementation of Trial 1.

specific Embodiment approach 3

[0037] Specific Embodiment 3. This embodiment is a further description of the method for measuring the absorption coefficient, scattering coefficient and thermal conductivity of translucent materials using transient photothermal signals generated by pulsed laser heating described in Embodiment 1. Step 3 The algorithm for the inverse problem described in is implemented by the improved simulated annealing-stochastic particle swarm optimization algorithm (SA-SPSO). Other steps are the same as the specific implementation of trial one or two.

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Abstract

The invention relates to a method for measuring thermophysical parameters of a translucent material, in particular to a method for measuring thermophysical parameters of a translucent material with transient photothermal signals generated by heating pulse lasers. The method comprises the steps that the surface of one side of the translucent material is irradiated by the lasers, a thermocouple thermodetector is used for measuring and recording the changes of the temperature of the two surfaces of the material along with time, and a laser power meter is synchronously used for respectively measuring the hemispherical reflecting radiation signals of the laser incidence side of a test-piece and the hemispherical transmission radiation signals of the laser emitting side of the test-piece. According to the laser transmission radiation signals, the reflecting radiation signals and the temperature, changed along with the time, of the two surfaces, the absorption coefficient, the scattering coefficient and the heat conduction coefficient of the translucent material are obtained on the basis of an inverse problem solving technology. A direct problem model and an inverse problem model for measuring the absorption coefficient, the scattering coefficient and the heat conduction coefficient of the translucent material are built, and the absorption coefficient, the scattering coefficient and the heat conduction coefficient of the translucent material can be simultaneously measured simply, fast and accurately through the inverse problem solving technology.

Description

technical field [0001] The invention relates to a method for measuring the absorption coefficient, scattering coefficient and thermal conductivity of translucent materials by using transient photothermal signals generated by pulsed laser heating, and belongs to the technical field of thermophysical parameter measurement of translucent materials. Background technique [0002] Translucent materials refer to materials whose spectral optical thickness is limited in one or several wavelength ranges. It involves many fields such as aerospace, military, energy, chemical industry and biomedicine. It is used in the optimal design of the optical window of aerospace vehicles, the manufacture of aero-engine ceramic parts, the growth of optical crystals, the manufacture of optical fibers and optical components, the melting and solidification of phase change materials in high-temperature thermal energy storage systems, and the research on the inverse problem of radiation transfer in biolo...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/49G01N25/20
Inventor 齐宏牛春洋姚禹辰阮立明
Owner HARBIN INST OF TECH
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