A high frequency platinum resistance thermometer system for measuring turbulent atmospheric temperature fluctuations
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Authors
Boston, Noel E. J.
Sipe, Edman L.
Subjects
turbulence, atmospheric temperature fluctuations,
platinum resistance thermometer
Advisors
Date of Issue
1975-02
Date
1 July 74-1 February 75
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
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.
Type
Technical Report
Description
Series/Report No
Department
Oceanography
Identifiers
NPS Report Number
NPS-58Bb75021
Sponsors
supported by the Chief of Naval Research
Funder
61153N: RR131-03-01:
NR 083-275: WR-5-0020
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.