Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1992-12-02
1994-03-22
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250343, 250345, 128719, G01J 52
Patent
active
052967069
ABSTRACT:
An anesthetic agent analyzer having six or more independent analytical channels, where each channel comprises a first thermopile which receives incident infrared radiation and a second thermopile behind the first thermopile which is blocked from the incident infrared radiation and thus serves as a reference for detecting ambient temperature variations. The first and second thermopiles are connected in a "parallel opposed" fashion so that the effects of ambient temperature variations automatically cancel and the detectors may be readily configured in a detector package. The anesthetic agent analyzer of the invention is designed for use with a wideband infrared radiation source so that anesthetic agents having characteristic absorption bands in the far infrared wavelength range (6-15 microns) may be more readily detected and discriminated. When implemented in a mainstream configuration, a disposable airway adapter with windows formed of polypropylene or some other suitable window material which minimally attenuates the infrared energy at the wavelengths of interest is also used. The concentrations of the discriminated anesthetic agent gases are then calculated using a second order polynomial equation having cross product terms. By connecting the first and second thermopiles in a back to back configuration, the detector device of the invention permits twice as many independent analytical channels to be provided in the same substrate area, with the resultant reduction in ambient temperature gradients.
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Braig James R.
Goldberger Daniel S.
Herrera Roger O.
Yelderman Mark L.
Critikon Inc.
Dunn Drew A.
Fields Carolyn E.
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