A high frequency platinum resistance thermometer system for measuring turbulent atmospheric temperature fluctuations
Boston, Noel E. J.
Sipe, Edman L.
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A sensor and electronic system has been developed and used to measure high frequency, small scale atmospheric temperature fluctuations. The sensor consists of a platinum wire 0.25ym in diameter and 0.30mm in length. The wire has a time constant of less than lOysec in a 4 m/sec airflow. With a detection current of 50y amps its sensitivity is 0.063 mv/ C. The electronic system consists of an 80kHz multivibrator, bridge, bridge amplifier, synchronous detector and DC amplifier. The overall system frequency response is flat from DC to 4.5 kHz. The bridge has a noise level of 0.40uv rms and is capable of measuring temperature changes of 0.048 C. The overall system noise level varied from 0.18 mv at 10 Hz to 1.6 mv at 1 kHz. Methods are suggested for improving these figures.
NPS Report NumberNPS-58Bb75021
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