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Underwater inspection apparatus and method

  • US 5,184,230 A
  • Filed: 12/31/1990
  • Issued: 02/02/1993
  • Est. Priority Date: 07/01/1988
  • Status: Expired due to Fees
First Claim
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1. A holographic recording and reproducing system comprising:

  • means for using a beam of radiation from a source for recording holographic images of an object positioned in a first medium and replaying said images in a second medium;

    means selectively responsive to the polarization of radiation reflected from said source; and

    gating means for selectively limiting an extent, in a direction of propagation of said radiation, of the region from which images are recorded substantially to reduce the effect on a photosensitive medium of radiation other than radiation capable of producing said holographic images, wherein said gating means includes coherence gating means selectively to receive radiation from a predetermined target region.

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