Apparatus and a method for indicating variations in acoustic pro

Details Apparatus and a method for indicating variations in acoustic pro Apparatus and a method for indicating variations in acoustic pro

1981-10-13

1983-11-15

Birmiel, Howard A.

Measuring and testing

Liquid level or depth gauge

73599, G01F 2300, G01F 2328, G01N 2900

Patent

active

044148496

ABSTRACT:
The apparatus provides for detection of variation in acoustic properties at a metal to air interface (18) such as may be caused by arrival of drops of leaking liquid. Ultrasonic signal pulses from transducer (14) are reflected many times back and forth across rod (11) between the transducer and the interface (18). Change in diminution of amplitude with successive reflection can be detected over a multiplicity (e.g. 10) of reflections and indicates change in the acoustic properties of the interface. Comparison is made between a selected early reflected signal pulse and a selected later reflection. Response is inhibited in respect of intermediate reflections.

REFERENCES:
patent: 3427867 (1969-02-01), Nute et al.
patent: 3603149 (1971-09-01), McKown
patent: 4144517 (1979-03-01), Baumoel
patent: 4203324 (1980-05-01), Baumoel
patent: 4232544 (1980-11-01), Stapsfield
patent: 4316183 (1982-02-01), Palmer et al.
patent: 4320659 (1982-03-01), Lynnworth et al.

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