Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1975-02-06
1976-10-19
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250351, 250510, 356 51, G21F 302, G21K 300, G01N 2134
Patent
active
039873030
ABSTRACT:
A gas analyzer is provided which is particularly suited for making transcutaneous measurement of the CO.sub.2 concentration in the blood.
In accordance with one embodiment of the invention, sample gases from the body are circulated in a cavity of the device. A rotating wheel in the cavity includes two reference cells and a sample cell which are sequentially rotated into the optical path between a source and a detector. Three signals are thereby provided which may be combined to give an output indication of the CO.sub.2 concentration in the body fluids. In a preferred embodiment, the sample cell is an "inverted cell" being in open communication with the sample gas circulating in the device so that the gas in the sample cell is a portion of the circulating gas which also surrounds the two reference cells. An output indication is thereby obtained which is insensitive to contaminants in the sample.
In accordance with another embodiment, the sample cell is isolated from the region surrounding the wheel and positioned so as to be presented in series with the reference cells in the optical detection path.
In preferred embodiments, the rotating wheel contains a number of permanent magnets which interact with a number of electromagnets driven in sequence to provide rotation of the wheel.
REFERENCES:
patent: 3793525 (1974-02-01), Burch et al.
patent: 3811776 (1974-05-01), Blau
patent: 3878107 (1975-04-01), Pembrook et al.
Bridgham John A.
Chaney Robert L.
Fostick Moshe A.
Hill Charles M.
Lazier John K. D.
Grigsby T. N.
Grubman Ronald E.
Hewlett--Packard Company
Smith Alfred E.
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