Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1980-10-29
1983-02-01
Nelms, David C.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250573, 356410, A61M 516
Patent
active
043717861
ABSTRACT:
A method and apparatus for sensing the presence of bubbles in a liquid wherein radiation is directed through said liquid toward a radiation responsive sensor and the differential between the response of the sensor when a bubble is not present in the radiation path and the response thereof when a bubble is present in the radiation path is markedly increased by limitation of the radiation which can reach said sensor to wavelengths strongly absorbed by said liquid.
REFERENCES:
patent: 3909136 (1975-09-01), Thomas
patent: 3910701 (1975-10-01), Henderson et al.
patent: 4312341 (1982-01-01), Zissimopoulos et al.
Hostetter Darwin R.
Miles Laboratories Inc.
Nelms David C.
Schwalbach Joseph C.
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