Two step demodulation synchronous detector

Details Two step demodulation synchronous detector Two step demodulation synchronous detector

1992-02-25

1994-04-19

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

329345, G01C 1972

Patent

active

053050860

ABSTRACT:
In a synchronous detector a first local signal from a first local signal generator is frequency divided by a frequency divider to obtain a second local signal. The polarity of the first local signal is inverted by a polarity inverter in synchronization with the second local signal, and the output of the polarity inverter is used to synchronously detect the output of an AC amplifier by a first synchronous detector. The synchronous detected output is synchronously detected by the second local signal in a second synchronous detector, the detected output of which is averaged by a filter.

REFERENCES:
patent: 4591269 (1986-05-01), Mohr
patent: 5009480 (1991-04-01), Okada et al.
patent: 5148236 (1992-09-01), Blake et al.

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