Title:
APPARATUS AND METHOD FOR MEASURING THERMAL DIFFUSION COEFFICIENT
Document Type and Number:
Japanese Patent JP3849295
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To correctly obtain a thermal diffusion coefficient in a simple method, by measuring a movement of heat between two points separated from a heat source, not the transfer of heat from a point where the heat is applied to a measurement point.
SOLUTION: A sample stage 15 is formed of a material of poor thermal conductivity. A cloth is attached on the sample stage for the purpose of heat insulation. The sample stage is adjusted in position by a lift mechanism. A sample 11 to be measured is placed on the sample stage 15 which is brought in touch with thermocouples 12 and 13 by the lift mechanism. A wire of a small diameter is used for the thermocouples 12 and 13 to enhance heat responsivity. The thermocouples are spaced via a predetermined distance. Outputs of the thermocouples are inputted directly to a two-pen recorder. While a recording paper of the recorder is sent at a constant speed, a heater 14 is brought in touch with the sample 11 for only a moment and immediately separated. A position where the sample is brought in touch with the heater 14 is determined beforehand. As a result, two curves are plotted at the recorder. A time difference when output values of the curves become half a maximum value respectively is obtained, whereby a thermal diffusion coefficient is obtained according to a calculation formula.
Inventors:
Yoshimasa Ohki
Akira Taomoto
Tsuchiya Souji
Akira Taomoto
Tsuchiya Souji
Application Number:
JP12571198A
Publication Date:
November 22, 2006
Filing Date:
May 08, 1998
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G01N25/18; (IPC1-7): G01N25/18
Domestic Patent References:
| JP63241457A | ||||
| JP5119003A |
Other References:
藤代博之,低温における熱拡散率と熱伝導率の同一セッティング測定,低温工学,日本,社団法人 低温工学協会,1993年 9月25日,第28巻 第9号,p51~p57
F. Shen,Containerless Thermal Diffusivity Determination of High-Temperature Levitated Spherical Specimen by,JOURNAL OF HEAT TRANSFER,米国,1997年 3月,Vol. 119,210~219
F. Shen,Containerless Thermal Diffusivity Determination of High-Temperature Levitated Spherical Specimen by,JOURNAL OF HEAT TRANSFER,米国,1997年 3月,Vol. 119,210~219
Attorney, Agent or Firm:
Fumio Iwahashi
Hiroki Naito
Daisuke Nagano
Hiroki Naito
Daisuke Nagano