ACOUSTIC-OPTICAL DEVICE FOR DETECTION OF FREQUENCY OF RADIO SIGNAL Russian patent published in 1996 - IPC

FIELD: optical electronics. SUBSTANCE: device has amplitude diffraction grid, acoustic-to-optical transducer, converging lens, photodetector. Distance between amplitude grid and acoustic-to-optical transducer conforms to approximate equation N•d•α/λ, where z is distance between amplitude diffraction grid and acoustic-to-optical transducer, d is period of amplitude diffraction grid, L is length of sound wave in acoustic-to-optical transducer, l is length of light wave, N is positive integer. Device may be used in systems of acoustic-optical signal processing and devices for interface between radio signal processing systems and optical signal processing systems. EFFECT: frequency detection through heavy noise with large number of spectral constituents. 1 dwg, 1 tbl