Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1983-04-04
1984-12-18
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
361152, G01F 160
Patent
active
044884389
ABSTRACT:
A square-wave current generator with a power supply section, control elements connected in series across the power supply section, an exciting current detecting resistor connected in series with an excitation coil through which an exciting current flows between center terminals of the power supply section and the control elements, a reference signal generator for delivering a square-wave voltage signal varying with a given period and equal amplitudes on both positive and negative sides, and an operational amplifier supplied with the square-wave voltage signal and a voltage drop caused at the detecting resistor by the exciting current to produce an output signal for controlling the control elements, thereby causing an exciting current corresponding to the square-wave voltage signal in period, amplitude and polarity to flow through the excitation coil.
REFERENCES:
patent: 3351822 (1967-11-01), Imahashi
patent: 3955413 (1976-05-01), Steele et al.
patent: 4144751 (1979-03-01), Yokoyama
patent: 4325261 (1982-04-01), Freund, Jr. et al.
patent: 4373400 (1983-02-01), Sekiguchi
patent: 4409846 (1983-10-01), Ueno
Ruehl Charles A.
Tokyo Shibaura Denki Kabushiki Kaisha
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