Measuring and testing – Simulating operating condition – Marine
Patent
1981-09-11
1983-07-05
Kazenske, E. R.
Measuring and testing
Simulating operating condition
Marine
73204, G01F 168, G01M 1500
Patent
active
043911323
ABSTRACT:
A gas flow measuring apparatus includes first and second temperature dependent resistors located in a gas tube respectively downstream and upstream of an electric heater which is also located in the gas tube. The first and second temperature dependent resistors are connected to form a bridge circuit together with first and second reference resistors. Between a pair of diagonal junctions of the bridge circuit, a potential difference is produced depending on the flow rate of the gas and the power supplied to the electric heater, and a measuring circuit controls the power supplied to the electric heater so that the potential difference is maintained at a predetermined value irrespective of a change in flow rate of the gas. The measuring circuit includes a chopper circuit to convert the potential difference into a square wave having a peak-to-peak value substantially equal to the potential difference and having a center reference level of the square wave corresponding to a voltage level determined by a reference voltage generator and an adder circuit. The square wave from the chopper circuit is then amplified and half rectified and applied to a sample-hold circuit to produce a voltage signal representative of the potential difference. A differential amplifier having two inputs of the voltage signal from the sample-hold circuit and a predetermined voltage produces an output signal which is used to control the power supplied to the electric heater. A current flowing into the electric heater is used to determine the flow rate of the gas.
REFERENCES:
patent: 4067233 (1978-01-01), Obayashi et al.
patent: 4089214 (1978-05-01), Egami et al.
patent: 4275590 (1981-06-01), Kawai et al.
patent: 4304129 (1981-12-01), Kawai et al.
Egami Tsuneyuki
Kawai Hisasi
Kohama Tokio
Obayashi Hideki
Kazenske E. R.
Nippon Soken Inc.
Schuster David R.
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