| 摘要 |
A system for converting an acoustic wave field to a light wave field including an acoustically transmissive medium, a solid elastic or liquid reflective interface at a boundary of the medium, means for generating an acoustic wave field in the medium, means for optically detecting the acoustic wave field incident at the reflective interface, and a grating or grid immersed in the acoustic medium adjacent to but spaced from the reflective interface. The grating is formed of a material having an acoustic impedance different from the medium thereby to superimpose the acoustic wave field on a spatial frequency carrier.
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