Device for detecting inhomogeneities such as gas bubbles
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United States of America Patent
Stats
-
Nov 25, 1980
Issued Date -
N/A
app pub date -
Sep 1, 1978
filing date -
Sep 1, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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