Title:
METHOD AND INSTRUMENT FOR MEASURING GAS TEMPERATURE BY HETERODYNE INTERFERENCE METHOD
Document Type and Number:
Japanese Patent JP3871860
Kind Code:
B
Abstract:
PROBLEM TO BE SOLVED: To provide a method and instrument for measuring gas temperature by heterodyne interference method capable of contactlessly measuring variation of a gas temperature with high responsiveness and high precision.
SOLUTION: Refractive index change of gas is calculated based on phase change of a beat frequency in a measuring part 20 using heterodyne interference method in which an acoustic optical element 12 for heterodyne is utilized to measure the gas temperature, a Gladstone-Dale constant is found based on a gas composition, and the gas temperature is measured based on a state equation of gas using pressure value of the gas.
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Inventors:
Tomita, Eiji
Kawahara, Nobuyuki
Kawahara, Nobuyuki
Application Number:
JP2000000219968
Publication Date:
October 27, 2006
Filing Date:
July 21, 2000
Export Citation:
Assignee:
JAPAN SCIENCE & TECHNOLOGY CORP
International Classes:
G01K5/28; G01K13/02; G01N21/45; G01K5/00; G01K13/00; G01N21/41; (IPC1-7): G01K5/28; //G01N21/45