Apparatus and method for measuring the ratio of two signals

Details Apparatus and method for measuring the ratio of two signals Apparatus and method for measuring the ratio of two signals

1979-08-28

1981-06-09

Corbin, John K.

Optics: measuring and testing

For light transmission or absorption

By comparison

364850, G01N 2159

Patent

active

042721970

ABSTRACT:
The ratio of the intensity of two light beams is determined by an apparatus which includes a chopper wheel for chopping one of the light beams, a photodetector for detecting the intensity of both light beams applied simultaneously thereto, and a logarithmic amplifier for amplifying the current produced by the photodetector. The AC component of the logarithmically amplified current represents the ratio of the intensity of the two light beams.

REFERENCES:
patent: 3455636 (1969-07-01), Haswell
patent: 3497302 (1970-02-01), Tipotsch
patent: 3669547 (1972-06-01), Sell
patent: 3756721 (1973-09-01), Williams
patent: 3787121 (1974-01-01), Lowy et al.
patent: 3793579 (1974-02-01), Cason et al.
patent: 3918815 (1975-11-01), Gadbois

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