Bubble detector circuit with variable reference level

Details Bubble detector circuit with variable reference level Bubble detector circuit with variable reference level

1983-06-20

1984-12-11

Coven, Edward M.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604 67, 128DIG13, A61M 514

Patent

active

044876017

ABSTRACT:
A bubble detector system is provided which dynamically responds to changes in energy transmission efficiency. The output of a detector is coupled to a dynamic reference level circuit, which develops a reference level that changes slowly in a time-varying manner with changes in the energy level received by the detector. The output of the detector is also coupled to a bubble detector circuit which produces a detection signal that changes rapidly when gas is present between an energy source and the detector. The detection and reference levels are compared to detect the presence of gas in the flow of fluid between the energy source and the detector.

REFERENCES:
patent: 2835252 (1958-05-01), Mauchel
patent: 3935876 (1976-02-01), Massie et al.
patent: 4014206 (1977-03-01), Taylor
patent: 4137913 (1979-02-01), Georgi
patent: 4280495 (1981-07-01), Lampert
patent: 4344429 (1982-08-01), Gupton et al.
patent: 4354502 (1982-10-01), Lolloy et al.
patent: 4367736 (1983-01-01), Gupton
patent: 4383252 (1983-05-01), Purcell et al.

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