Synchronous detection system for multichannel infrared spectroscopy
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United States of America Patent
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Jun 27, 2000
Grant Date -
N/A
app pub date -
Dec 21, 1998
filing date -
Feb 23, 1996
priority date (Note) -
Expired
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Abstract
Disclosed is a radiation detector which includes at least one photoconductive detector and a modulator, which modulates in an on-off manner radiation passing to the photoconductive detector from a radiation source. A bias source is connected to one terminal of the photoconductive detector. A first amplifier is connected to the other terminal of the photoconductive detector, and a second amplifier receives an output of the first amplifier. A first phase detector detects the phase of modulation of the radiation source by the modulator and generates a reference signal relating thereto. A switch in the second amplifier changes, in response to the reference signal generated by the first phase detector, the second amplifier between an inverting state and a non-inverting state as the modulator changes the phase of modulation of the radiation.
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