Apparatus for the measurement of thermal diffusivity featuring a low-frequency sine-wave generator and a digital phase meter
- 1 September 1978
- journal article
- Published by IOP Publishing in Journal of Physics E: Scientific Instruments
- Vol. 11 (9) , 941-947
- https://doi.org/10.1088/0022-3735/11/9/019
Abstract
The apparatus enables the thermal diffusivity of a wide range of solids to be measured to an accuracy of +or-2% using the Angstrom method. It features a low-frequency sine-wave generator which produces stable sinusoidal temperature conditions at the heater, and a digital phase meter which measures phase directly in degrees with a resolution of 0.1 degrees . A low-noise amplifier and an active bandpass filter are used to improve the signal-to-noise ratio whenever conditions are such that the signals from thermocouples or probes are weak. Results are reported of the thermal conductivity of samples of single-crystal silicon and germanium in the temperature range 300-700K.Keywords
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