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Hamamatsu Corp. - Mid-Infrared LED 11/24 LB
Photonics Dictionary

Debye-Sears ultrasonic cell

A device used in ultrasonic imaging to measure the velocity and attenuation of compressional waves in a transparent liquid by virtue of acoustic waves set up in the liquid. The wavefronts serve as a plane light diffraction grating to diffract a light beam striking the liquid on either side of the zero-order spot.
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