System for processing and measuring signals delivered by each detector in a modulation spectrometer

摘要

This system comprises, for each detector, a chain of amplification of the signals delivered by this detector, measuring means (10) connected at the output of the amplification chain, each chain comprising at least one selective amplifier (29), tuned to the modulation frequency of the beams, followed by a bialternating detector (33). It is characterised in that each amplification chain further comprises an active electrical filter (40) rejecting the residual wave of frequency double that of modulation, this filter is connected between an output of the bialternating detector (33) and an input of the measuring means (10). Application to light beam modulation spectrometers. IMAGE