Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1989-11-02
1991-12-03
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250339, 250351, G01N 2135
Patent
active
050702459
ABSTRACT:
An apparatus and method for the identification of one or more anesthetic or other gases included in the respiratory air of a patient, said identification being effected within the infrared range 3-4 .mu.m. The appratus comprises a radiation source (4), a chamber (1) for receiving therein a gas or gases to be examined, an optical filter (7) for passing the radiation exiting the chamber therethrough, an optical focusing device (12) through or via which the incoming radiation travels, a radiation detector (10) and a measuring processor (19) which performs the measuring and identification. The transmission band of the optical filter (7) or a combination of successive filters is within a range of 1.5%-0.4% of the mean transmission wavelength and the ray arriving at filter (7) has an angle of incidence between 10.degree.-60.degree., the measuring effected within this range being performed at more than two angles. A measured spectrum is compared with a prior known spectrum by means of correlation algorithm to carry out the ientification. In a monitor for anesthetic gases, the content of gases is measured by means of a rapid-response sensor breath by breath. The quality or mixing ratio of an anesthetic gas is, in turn, measured by means of a slower sensor of the type described above.
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Aidan E. Roche and Alan M. Title, "Tilt Tunable Ultra Narrow-Band Filters for High Resolution Infrared Photometry." Applied Optics, vol. 14, No. 3 (Mar. 1975), pp. 765-770.
Rantala Borje T.
Weckstrom Kurt P.
Hannaher Constantine
Instrumentarium Corporation
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