Illuminant discrimination apparatus and method

Details Illuminant discrimination apparatus and method Illuminant discrimination apparatus and method

1978-10-25

1980-09-02

Hille, Rolf G.

Optics: measuring and testing

Photometers

Photoelectric

356226, 354 60L, 250226, G01J 334, G01J 142, G03B 700

Patent

active

042204127

ABSTRACT:
A method and apparatus for discriminating among various types of illuminants, such as fluorescent light, incandescent light and natural daylight. Such apparatus includes a photoelectric circuit for producing a signal having an amplitude which varies with intensity variations of the illuminant, a bandpass filter circuit having a bandpass centered at the fundamental frequency of the intensity variations of an illuminant energized by an alternating current source, a high-pass filter circuit that passes frequencies higher than such fundamental frequency, a pair of peak detectors for detecting the peak value of signals passed by the first and second filter circuits, and logic circuitry responsive to the outputs of the peak detectors for providing logic outputs indicative of the type of illuminant.

REFERENCES:
patent: 3672268 (1972-06-01), Scheibel et al.
patent: 3904872 (1975-09-01), Ebukuo et al.
patent: 4041308 (1977-08-01), Fujita
patent: 4079388 (1978-03-01), Takahama et al.

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