APPARATUS FOR SELECTING SIGNALS ACCORDING TO FREQUENCY Russian patent published in 2013 - IPC G08C23/02 G02F1/33 

FIELD: radio engineering, communication.

SUBSTANCE: device for selecting signals includes optically series-connected laser, collimator, first acousto-optical modulator (AOM), the electrical input of which is the input of the device, a first lens of a projecting optical system, a first spatial filter, a series-connected second lens of the projecting optical system, a second AOM optically connected to an integrating lens through a second diffraction order, a second spatial filter and a photodetector in form of a line of photodiodes. Electrical inputs of the first and second AOM are combined, and the propagation speed of the acoustic wave in the second AOM is selected twice higher than the propagation speed of the acoustic wave in the first AOM.

EFFECT: high output signal level, designing a signal selection device independent of the time of arrival of the signal.

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