Measuring and testing – Liquid level or depth gauge
Patent
1982-01-04
1984-09-11
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
367108, 367908, G01F 2328, G01S 1508
Patent
active
044702990
ABSTRACT:
An ultrasonic echo-ranging system adopted to measure the level of liquid in an open channel or other liquid container. The system includes an ultrasonic transducer disposed at a fixed position directly above the liquid surface, the nature of the gaseous environment therebetween determining the velocity of ultrasonic energy propagated therethrough. The transducer is excited to emit periodic pulses which are directed along a center path toward the liquid surface and reflected to produce liquid echo pulses which return to the transducer and are detected thereby. A reference reflector at a predetermined position relative to the transducer intercepts energy from a side path in the radiation pattern of the transducer to return it to the transducer to produce reference echo pulses. Means are provided to determine the transit time of pulses along the center path, and also to determine the transit time along the side path. The ratio of the reference side path and center path transit times is computed to provide an output representing the level of liquid independent of changes in the gaseous environment.
REFERENCES:
patent: 3834233 (1974-09-01), Willis et al.
patent: 3996798 (1976-12-01), Vander Heyden
patent: 4130018 (1978-12-01), Adams et al.
patent: 4146869 (1979-03-01), Synder
patent: 4159646 (1979-07-01), Paulsen et al.
patent: 4170144 (1979-10-01), Scott
patent: 4210967 (1980-07-01), Massa
Ebert Michael
Fischer & Porter Company
Yasich Daniel M.
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