“…With a Fresnel lens (Fig. 3.11 and [1498,1499]) the transit-time differences arise from different velocities in the lens material compared with air and by the varying thickness of different sections of the lens. With a zone lens (Fig.…”
Section: Zone Construction Of a Sound Field According To Fresnelmentioning
“…With a Fresnel lens (Fig. 3.11 and [1498,1499]) the transit-time differences arise from different velocities in the lens material compared with air and by the varying thickness of different sections of the lens. With a zone lens (Fig.…”
Section: Zone Construction Of a Sound Field According To Fresnelmentioning
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