Ultrasonic streaming current detector
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United States of America Patent
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Apr 25, 1989
Grant Date -
N/A
app pub date -
Jul 9, 1987
filing date -
Jul 9, 1987
priority date (Note) -
Expired
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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.
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