Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate
2005-04-05
2005-04-05
Healy, Brian (Department: 2883)
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
C250S340000, C250S341700, C250S341800
Reexamination Certificate
active
06875985
ABSTRACT:
An infrared absorption gauge includes a detector circuit including a detector for detecting electromagnetic radiation from a sample and for generating a signal representing the radiation received, and means for stabilizing a response characteristic of the detector to the radiation detected thereby, said stabilizing means having a GaAs diode for directing radiation at the detector and means for controlling the radiation source in dependence upon the signal generated by the detector. The stabilizing means thus acts as a negative feedback loop and seeks to maintain the overall illumination irradiating the detector (i.e. the combined illumination that is reflected back from the sample and that is emitted by the GaAs diode), at a substantially constant predetermined level, which tends to linearize and extend the frequency response of the detector to the radiation detected.
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Kalivoda Christopher M.
Katten Muchin Zavis & Rosenman
NDC Infrared Engineering Limited
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