Ultrasonic streaming current detector

Details Ultrasonic streaming current detector Ultrasonic streaming current detector

1987-07-09

1989-04-25

Eisenzopf, Reinhard J.

Electricity: measuring and testing

A material property using electrostatic phenomenon

In a liquid

324 711, 324447, 134 1, G01N 2760

Patent

active

048251690

ABSTRACT:
A streaming current detector includes an optical shutter rotated by the shaft of the motor which reciprocates a piston between electrodes in a bore containing sample fluid. An electronic synchronous detector is controlled by the output of a light detector whose source is interrupted by the optical shutter. The alternating current signals from the electrodes are connected to an operational amplifier having its inverting input connected to its output solely by a capacitor so that the output voltage is proportional to the charge of the fluid.

REFERENCES:
patent: 3368144 (1968-02-01), Gerdes
patent: 3368145 (1968-02-01), Gerdes
patent: 3369984 (1968-02-01), Gerdes et al.
patent: 3399133 (1968-08-01), Gerdes et al.
patent: 3746988 (1973-07-01), Ford et al.
patent: 4297640 (1981-10-01), Moore
patent: 4446435 (1984-04-01), Canzoneri

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