acoustic grating

acoustic grating

[ə′küs·tik ′grāt·iŋ]
(acoustics)
A series of rods or other suitable objects of equal size placed in a row a fixed distance apart; causes sounds with different wavelengths to be diffracted in different directions.
References in periodicals archive ?
The stationary, but dynamic, acoustic grating scatters some of the probe light out of the beam and its transmission will be reduced, as sketched in Figure 6(a).
The signal on the Stokes side is reduced when the pump-probe frequency difference matches the Brillouin shift by scattering from the pump-induced SBS acoustic grating. The positive frequency gain (anti-Stokes) occurs due to scattering from already-excited phonons.
"How deep the notches should be comes from number theory." The result is an acoustic grating analogous to diffraction grating used to scatter light.