DocumentCode :
976528
Title :
A Constant-Temperature-Operation Hot-Wire Anemometer
Author :
Janssen, J.M.L. ; Ensing, L. ; Van Erp, J.B.
Author_Institution :
Royal Dutch/Shell Lab., Delft, of N. V. de Bataafsche Petroleum Maatschappij, The Hague, Holland
Volume :
47
Issue :
4
fYear :
1959
fDate :
4/1/1959 12:00:00 AM
Firstpage :
555
Lastpage :
567
Abstract :
The behavior of a hot-wire anemometer is analyzed using signal flow diagrams, especially for the case of a constant-temperature-operation anemometer, comprising a dc bridge and a dc differential amplifier. The influence of static bridge unbalance and of the amplifier´s gain for in-phase input signals on the over-all dynamic characteristics is analyzed, and requirements for the amplifier are derived. A chopper-stabilized amplifier is employed, which automatically maintains static bridge balance under all operating conditions. The signal-to-noise ratio for comparable instruments having constant-current operation and constant-temperature operation is shown to be equal. Results of measurements are reported; they are in fair agreement with the developed theory. A nonlinear circuit is described, which delivers a voltage directly proportional to the instantaneous air velocity.
Keywords :
Bridge circuits; Current supplies; Electric resistance; Fluid flow measurement; Instruments; Resistance heating; Signal analysis; Temperature; Voltage; Wire;
fLanguage :
English
Journal_Title :
Proceedings of the IRE
Publisher :
ieee
ISSN :
0096-8390
Type :
jour
DOI :
10.1109/JRPROC.1959.287338
Filename :
4065711
Link To Document :
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