Measuring and testing – Volume or rate of flow – Thermal type
Patent
1990-05-10
1991-12-03
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
7320418, G01F 168, G01P 510
Patent
active
050690663
ABSTRACT:
A constant temperature anemometer having a single self-heated non-zero temperature coefficient resistive anemometer sensing element operated as one arm of a four-arm Wheatstone bridge whose opposing or reference arm contains a temperature sensor, with the four-arm bridge operated as a single arm of a second Wheatstone bridge whose reference arm contains a second temperature sensor, the second bridge operated as the controlled bridge in a constant temperature (constant resistance) anemometer configuration resulting in feedback controlled constant resistance operation of the bridge within a bridge. The sub-bridge output is determined by a differential amplifier, thereby removing the need for a d-c offset or reference signal to remove or suppress the mean heating term obtained electrically across the single heated anemometer sensing element. In effect, differential operation is provided for a single element anemometer transducer. Alternative single element differential operation without temperature sensing is described. Use of different curvature temperature characteristics for the anemometer sensing element and the temperature sensor is disclosed.
REFERENCES:
patent: 3220255 (1965-11-01), Scranton et al.
patent: 3352154 (1967-11-01), Djorup
patent: 3363462 (1968-01-01), Sabin
patent: 3900819 (1975-08-01), Djorup
patent: 3991624 (1976-11-01), Davies
patent: 4024761 (1977-05-01), Djorup
patent: 4279147 (1981-07-01), Djorup
patent: 4373387 (1983-02-01), Nishimura et al.
patent: 4503706 (1985-03-01), Kolodjski
patent: 4523462 (1986-01-01), Kolodjski
patent: 4739657 (1988-04-01), Higashi et al.
patent: 4794794 (1989-01-01), Djorup
patent: 4794795 (1989-01-01), Djorup
Perry, A. E., "Hot-Wire Anemometry", Oxford University Press, New York, ISBN 0-19-856327-2 (1982).
Goldstein, Richard J., ed., "Fluid Mechanics Measurements", Hemisphere Publishing Corporation, New York, ISBN 0-89116-244-5 (1983).
LandOfFree
Constant temperature anemometer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Constant temperature anemometer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constant temperature anemometer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1691069