Sightless bubble detector

Details Sightless bubble detector Sightless bubble detector

1977-08-22

1979-02-13

Goldstein, Herbert

Measuring and testing

Gas content of a liquid or a solid

By vibration

73 61R, G01N 2902

Patent

active

041388798

ABSTRACT:
A detector comprises a pair of electromechanical transducers for disposition on a fluid-filled conduit in an acoustically coupled relationship, an adjustable gain driving amplifier responsive to the electrical output of one transducer for driving the other transducer, an automatic gain control circuit for automatically adjusting the gain of the driving amplifier maintaining the system on the margin of oscillation, and an indicating circuit for detecting modulation of the driving signal. Bubbles passing through the conduit increase the gain required to maintain the system on the margin of oscillation, and are detected as modulations of the driving signal. In a preferred embodiment, this bubble detector is utilized as a refrigerating system test instrument.

REFERENCES:
patent: 2573390 (1951-10-01), Blanchard
patent: 3974681 (1976-08-01), Namery
patent: 4015464 (1977-04-01), Miller et al.

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