Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1992-01-03
1993-08-03
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
128634, 2504581, 356 41, A61B 514
Patent
active
052331946
ABSTRACT:
A gas sensor using optical fiber technology to measure gas concentration in a test volume. In one embodiment, the sensor incorporates a gas enriching polymer which absorbs and concentrates carbon dioxide (CO.sub.2) from the test volume surrounding the sensor. The polymer is wrapped around the core of an optical fiber which guides radiation with first selected wavelengths to the polymer. The radiation propagates into the polymer and reacts with the carbon dioxide in the polymer. Determination of CO.sub.2 concentration in the test volume is made by measuring the amount of attenuation of the radiation after reacting with the carbon dioxide in the polymer. In another embodiment, the polymer is capable of absorbing oxygen from the test volume and oxygen concentration is measured using fluorescence quenching. Being added to the polymer, a special dye reacts to radiation having selected wavelengths and produces a second radiation with wavelengths which are different from the selected wavelengths and which are absorbed by oxygen. Determination of oxygen concentration in the test volume is made by measuring the degree of attenuation of the second radiation after reacting with the oxygen in the polymer.
REFERENCES:
patent: 4201222 (1980-05-01), Haase
patent: 4785814 (1988-11-01), Kane
patent: 4800886 (1989-01-01), Nestor
patent: 5142155 (1992-08-01), Mauze et al.
Gray Damien F.
Mauze Ganapati R.
Hannaher Constantine
Hewlett--Packard Company
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