Method and apparatus for determining a measurable variable

Details Method and apparatus for determining a measurable variable Method and apparatus for determining a measurable variable

1987-11-02

1989-04-18

Orsino, Joseph A.

Measuring and testing

Volume or rate of flow

Thermal type

340606, 340608, G08B 2100, G01F 168

Patent

active

048215686

ABSTRACT:
A method for determining a measurable variable of a flowing medium, in particular the flow velocity and/or the material properties, in which the temperature variation of a heated sensor is evaluated in an electronic measuring circuit for the determination of the variable. The measurement accuracy is improved in particular in the range of low flow velocities by heating the sensor with a heating pulse within at least one measurement period, and determining as a measured variable the time after which the sensor is cooled to at least a given temperature.

REFERENCES:
patent: 3498128 (1970-03-01), Calvet
patent: 3587318 (1971-06-01), Belugou
patent: 3719083 (1973-03-01), Morris et al.
patent: 3905230 (1975-09-01), Calvet et al.
patent: 4068526 (1978-01-01), Goldstein
patent: 4476714 (1984-10-01), Barry et al.
patent: 4501145 (1985-02-01), Boegli et al.
patent: 4770037 (1988-09-01), Noir et al.

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