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Details of a circuit and application of a new simple cold-wire thermometer employing a DC bridge are described. Very high stability and low noise level are special features of the present design. The test current injection method has been improved to obtain more robust operation under strong 60 Hz line noise. The 29.5 kHz bandwidth of the circuit makes it possible to measure temperature fluctuations up to 13.5 kHz, which is the highest frequency obtainable with the smallest cold-wire currently available without signal distortion. The static and dynamic characteristics of the thermometer have been verified in the axisymmetric heated jet experiment.
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Cho et al. (1993) studied this question.
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