Method and apparatus for measuring light by frequency modulation

Details Method and apparatus for measuring light by frequency modulation Method and apparatus for measuring light by frequency modulation

1986-11-18

1989-02-28

Wan, Gene

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

356325, G01J 342

Patent

active

048079936

ABSTRACT:
Method and apparatus for measuring light by frequency-modulating a light signal from a sample being measured and demodulating the modulated signal in synchronism with the modulating operation, wherein there is provided a delay circuit which produces a series of pulses for synchronous rectification of the modulated signal in response to and with a predetermined time delay after the modulating operation, so that before measurement of a specific sample the delay time is changed so as to determine the phase of the synchronous rectification pulses most suitable for measurement of the specific sample.

REFERENCES:
patent: 3345907 (1967-10-01), Wada
patent: 3993901 (1976-11-01), Widmer
patent: 4171913 (1979-10-01), Wildy et al.
patent: 4248536 (1981-02-01), Hijikata
patent: 4577106 (1986-03-01), Fukasawa et al.
patent: 4583853 (1986-04-01), Maeda et al.

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