Diffraction-grating transducers

Diffraction grating transducers, like optical diffraction gratings, produce beams at different angles for different frequencies. They transmit and receive what would be considered the grating lobe for conventional array transducers. Diffraction-grating transducers were developed to produce multiple beams at known angles so that angle-independent Doppler measurements could be made. The theory of operation of first and higher-order diffraction-grating transducers is presented, including the parameters that affect beam resolution and operating distance. A method to fabricate these transducers like composite transducers is outlined, and experimental results presented.