Arrangement for separating an optical signal from ambient light

Details Arrangement for separating an optical signal from ambient light Arrangement for separating an optical signal from ambient light

H - Electricity

04

B

325/1

H04B 10/158 (2006.01) G06K 7/10 (2006.01)

Patent

CA 1124798

ARRANGEMENT FOR SEPARATING AN OPTICAL SIGNAL FROM AMBIENT LIGHT Abstract An arrangement for separating ambient light from an optical data signal, comprising an interference filter having a passband which matches the wavelength of the op- tical data signal, and two photo diodes which are so arranged that one photo diode receives the light trans- mitted through the interference filter, and the other receives the light reflected from the filter. A variable aperture or an additional simple filter (5) is provided to adjust the transmitted and reflected portions of the ambi- ent light to one another. Output signals of the photo diodes are subtracted from each other in a compensation circuit. This results in compensation of the ambient light components so that an output signal from the com- pensation circuit only depends on the actual data signal. SZ9-78-003

339220

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