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Measuring method for simultaneously obtaining temperature-variable thermal conductivity coefficient and absorption coefficient of semi-transparent material

A technology of translucent material and thermal conductivity, applied in the direction of material thermal development, color/spectral property measurement, etc., can solve the problems of radiant thermal physical property result error, measurement error and other problems, and achieve the effect of simple model, high efficiency and sensitivity, and easy theoretical solution.

Active Publication Date: 2016-02-10
HARBIN INST OF TECH
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  • Summary
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  • Application Information

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Problems solved by technology

[0004] In the actual measurement process, there are certain measurement errors in the experimental equipment. In some cases, the measurement of radiant thermal properties cannot be completed by using light or thermal information alone, or the results obtained have large errors, and the inversion of temperature-related thermal properties requires more research. much measurement information

Method used

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  • Measuring method for simultaneously obtaining temperature-variable thermal conductivity coefficient and absorption coefficient of semi-transparent material
  • Measuring method for simultaneously obtaining temperature-variable thermal conductivity coefficient and absorption coefficient of semi-transparent material
  • Measuring method for simultaneously obtaining temperature-variable thermal conductivity coefficient and absorption coefficient of semi-transparent material

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specific Embodiment approach 1

[0026] Specific implementation mode 1. Combination figure 1 Describe this specific embodiment, obtain the measuring method of translucent material temperature change thermal conductivity and absorption coefficient at the same time, the specific operation steps of this method are:

[0027] Step 1, making a sample to be tested with a thickness of L;

[0028] Step two, such as figure 1 As shown, a continuous laser with a wavelength of λ is incident on the left surface of the sample to be tested along the direction perpendicular to the surface of the sample with a thickness of L, and the duration is t seconds; Time-varying temperature T w (t) and radiation intensity R(t);

[0029] Step 3. Use the idea of ​​solving the inverse problem to assume that the absorption coefficient κ of the corresponding wavelength of the sample to be tested varies with temperature a (T)=a 1 +a 2 ·Tmm -1 And the thermal conductivity λ(T)=b that varies with temperature 1 +b 2 TW / (m K); Then, by s...

specific Embodiment approach 2

[0043] Specific embodiment 2. This embodiment is a further description of the method for simultaneously obtaining the temperature-related thermal conductivity and absorption coefficient of a translucent medium described in specific embodiment 1. The method for obtaining the temperature field in the calculation domain in step 3 is:

[0044] Using the heat conduction differential equation:

[0045] ρc p ∂ T ∂ t = λ ( T ) ∂ 2 T ∂ z 2 - ∂ q r ∂ z - - - (...

specific Embodiment approach 3

[0050] Specific embodiment three. This embodiment is a further description of the method for simultaneously obtaining the temperature-related thermal conductivity and absorption coefficient of a translucent medium described in specific embodiment one. The method for obtaining the radiation field strength in the calculation domain in step three is:

[0051] Using the radiative transfer equation:

[0052] d I ( z , θ ) d z = - κ a I ( z ) + κ a I b ( z ) - - - ( 8 ) ...

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Abstract

The invention discloses a measuring method for simultaneously obtaining the temperature-variable thermal conductivity coefficient and absorption coefficient of a semi-transparent material and relates to a technology for simultaneously obtaining the temperature-relevant thermal conductivity coefficient and absorption coefficient of a semi-transparent medium. The measuring method comprises the steps of irradiating a sample to be measured by using continuous laser with a certain wavelength in the measuring process; measuring the time-variable temperature response and transmission radiation intensity of the sample to be measured by virtue of a detector; and finally, indirectly obtaining the temperature-variable thermal conductivity coefficient and absorption coefficient of the sample to be measured by using an inverse problem solving technology. Through establishing positive and reverse problem models of coupled heat conduction and radiation heat transfer of the semi-transparent medium of which the thermal conductivity coefficient and the absorption coefficient are changed along with temperature, the method for obtaining temperature-relevant thermal conductivity coefficient and absorption coefficient of the semi-transparent medium through simultaneous inversion realized by using a particle swarm optimization algorithm is proposed on the premise that other parameters of the medium are known. The measuring method is suitable for spaceflight, national defense and civil industry.

Description

technical field [0001] The invention relates to the technology of simultaneously obtaining the temperature-related thermal conductivity and absorption coefficient of a translucent medium, and belongs to the technical field of translucent medium physical property measurement. Background technique [0002] Radiation and thermal properties of translucent media are important parameters for analysis, design and optimization of translucent media during their application. In recent years, with the rapid development of modern high-tech such as aerospace, infrared detection, infrared characteristics of targets and environments, lasers, electronic devices, and biomedicine, the physical parameters of translucent media change with temperature under high temperature and multi-dimensional conditions. is particularly important. Research on the physical properties of participatory medium thermal radiation and related subjects is of great significance to both military and civilian fields. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N25/20
Inventor 任亚涛齐宏阮世庭阮立明谈和平陈澄肖昊苏
Owner HARBIN INST OF TECH
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