Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1974-07-15
1976-08-03
Queisser, Richard C.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
330 21, 330 32, G01N 2904
Patent
active
039722287
ABSTRACT:
Apparatus is described including means for generating short driving pulses for an ultrasonic transducer which are of selectable PRF and highly stable. A multi-stage amplifier for received signals comprises emitter-follower transistors of approximately unity gain coupled by step-up transformers. Expanded sweeps for a cathode-ray tube (CRT) display are produced from initial ramps synchronized with the driving pulses, and supplied through a variable attenuator to a limiter. Signal gates of adjustable position and width are produced from the sweeps and maintain their relative positions with respect to the sweeps during expansion. A threshold control circuit is gated to yield output signals for an alarm, etc. when received signals within the gate exceed an adjustable threshold level, and also produces a display signal gate for the CRT which accurately indicates the displayed echo amplitude required to actuate the threshold circuit. The received signals and display gate are supplied to the CRT on alternate sweeps and have coinciding baselines. Marker pulses are applied to both sets of sweeps on the same baseline.
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Crawford, Science and Electronics, June-July 1970, pp. 33-35.
Carlin, Ultrasonics, pp. 222-225, 234-235, 260, McGraw-Hill Book Co., 1960.
Kreitman Stephen A.
Magnetic Analysis Corporation
Queisser Richard C.
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