Gas flow measuring apparatus

Details Gas flow measuring apparatus Gas flow measuring apparatus

1979-11-27

1981-06-30

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

042755905

ABSTRACT:
Voltages at the diagonal points of a bridge circuit are amplified in an AC differential manner and half-wave rectified, which bridge circuit is formed of reference resistors and temperature dependent resistors located in front and rear of an electric heater in a duct through which air to be measured flows. The half-wave rectified voltage is sampled and held in synchronism with a control pulse signal from an oscillation circuit so that the sampling and holding operation is performed substantially at the center of the period during which the half-wave rectified voltage is produced. The held voltage and a constant reference voltage are amplified in a DC differential manner and then applied to a power amplifier circuit which controls a supply voltage to the electric heater. The voltage to be applied to the bridge circuit is an intermittent voltage which is produced by a chopper circuit.

REFERENCES:
patent: 3975951 (1976-08-01), Kohama et al.
patent: 4067233 (1978-01-01), Obayashi et al.
patent: 4089214 (1978-05-01), Egami et al.

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