Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1997-08-12
1999-10-12
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
25033913, G01N 2135
Patent
active
059658878
ABSTRACT:
A gas spectrometer is provided for the monitoring of the maintenance of desired calibration conditions. The inventive method and apparatus is particularly apt for use in respiratory gas spectrometers. Monitoring may be achieved by first establishing calibration condition values obtained by passing radiation beams through a reference gas chamber and purged, sample gas chambers upon initial calibration. Subsequently, e.g. after the spectrometer has been utilized in the field, corresponding test condition values are obtained by passing radiation beams through the same reference gas chamber and purged, sample gas chambers. Comparisons utilizing the calibrated condition values and test condition values can be made to monitor calibration variances (e.g. variances, in optical pathway conditions and depletion of the radiation source(s) utilized in the gas spectrometer).
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Datex-Ohmeda Inc.
Hannaher Constantine
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