Estimation of Thermal Conductivity and Thermal Diffusivity of Biological Materials using Thermographic Camera

2014 ◽  
Author(s):  
Navaphattra Nunak ◽  
Eakasit Sritham ◽  
Maethinee Songthai ◽  
Taweepol Suesut
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Biological Materials ◽  
Thermographic Camera

Feasibility Study of Noninvasive Measurement of Thermal Conductivity and Thermal Diffusivity for Biological Materials

2007 ◽  
Author(s):  
Keisuke Yoshida ◽  
Satoru Uchida ◽  
Hiroshi Takamatsu ◽  
Motoo Fujii
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Laser Irradiation ◽  
Temperature Fluctuation ◽  
Irradiation Time ◽  
Temperature Response ◽  
Biological Materials ◽  
Material Surface ◽  
Accuracy Of Measurement

A noninvasive technique was developed to measure the thermophysical properties of biological materials. In this technique the temperature response of a material surface heated by CO2 laser irradiation is measured with an infrared thermometry and compared with the theoretical response. The thermal conductivity and the thermal diffusivity are determined as the both values which yield the smallest deviation between the measured and analyzed temperature responses. The objective of the present study is to establish this technique by investigating the uncertainty of the method. An appropriate model of heat transfer is discussed first by taking into account of the effect of the laser absorption within the material and a heat loss from the material surface to the ambient. Then the accuracy of measurement is examined by using virtual experimental data with temperature fluctuation expected in an actual experiment. The virtual experimental data are generated by adding artificial fluctuation to a theoretical temperature response. The accuracy of measurement is estimated as a function of the standard deviation (S.D.) of the temperature fluctuation and the laser irradiation time. The effect of uncertainty in the absorption coefficient of the target material is also examined.

Non-invasive Measurement of Thermal Conductivity and Thermal Diffusivity of Biological Materials : Measurement of Agar Gels

2004 ◽  
Vol 2004 (0) ◽  
pp. 389-390
Author(s):  
Tsurumi Takamiya ◽  
Hiroshi Takamatsu ◽  
Satoru Uchida ◽  
Xing Zhang ◽  
Motoo Fujii
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Biological Materials ◽  
Non Invasive ◽  
Agar Gels ◽  
Invasive Measurement
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