Title :
A cross correlation noise thermometer for thermodynamic temperature measurement at low temperatures
Author_Institution :
Metrology Inst. of Japan, AIST, Tsukuba, Japan
Abstract :
A cross-correlation noise thermometer is designed and developed for practical and thermodynamic temperature measurements at low temperatures using the digital techniques. The basic characteristics of the noise thermometer are investigated at both room and liquid nitrogen temperatures. The thermal noise spectrum across a resistance sensor is analyzed by the FFT method. As preliminary results, the mean square of the noise voltage, which is proportional to thermodynamic temperature, is compared with the international temperature scale of 1990 at about 84 K.
Keywords :
correlation methods; fast Fourier transforms; nitrogen; noise measurement; temperature measurement; thermal noise; thermodynamics; thermometers; 84 K; FFT method; cross correlation noise thermometer; liquid nitrogen temperatures; low temperatures; thermal noise spectrum; thermodynamic temperature measurement;
Conference_Titel :
SICE 2003 Annual Conference
Conference_Location :
Fukui, Japan
Print_ISBN :
0-7803-8352-4
