Low Temperature Thermometry: Interim Report
G. Cataland · Harmon H. Plumb
Jan 1973 · U.S. National Bureau of Standards
Ebook
18
Pages
About this ebook
Earlier acoustical thermometer 'speed of sound' isotherms are compared with recent measurements. Where systematic deviations had appeared in "smoothing" through acoustically derived temperatures via germanium thermometers, a possible solution has emerged; more precise temperature control of the acoustical thermometer is desirable and has been realized. A cursory examination of the applicability of the Helmholtz-Kirchhoff equation was made with a modified sonic chamber. Measurements with the modified instrument have shown no changes in the experimental results. The maintenance of the NBS P2-20 (1965) scale is described. A new calibration apparatus was constructed to accommodate more germanium thermometers thus reducing the calibration cost per thermometer during a calibration run.
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