Detecting method and apparatus using heat sensitive devices

Details Detecting method and apparatus using heat sensitive devices Detecting method and apparatus using heat sensitive devices

1986-10-17

1988-07-12

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Responsive to change in rate of pump fluid flow

417 45, 73204, 128719, F04B 4900, G01F 168, A61B 508

Patent

active

047566701

ABSTRACT:
This invention relates generally to the sensing of phenomena using heat sensitive devices. More particularly, the invention relates to an improved method and system wherein the ratio of the dissipation coefficients of a pair of electrically heated matched temperature sensitive devices is detected, which method and system are insensitive to variation in ambient temperature.

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Robert A. Rasmussen; Application of Thermistors to Measurements in Moving Fluids; vol. 33, No. 1; Jan. 1962, pp. 38-42.
M. T. Pigott and R. C. Strum; Observed Behavior of a Thermistor Bed Flow Meter; vol. 38, No. 6; Jun. 1967, pp. 743-744.
Helmut Forstner and Klaus Rutzler; Two Temperature-Compensated Thermistor Current Meters for Use in Marine Ecology; vol. 27, No. 2; Mar. 1969, pp. 263-271.

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