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US 5,184,230 AGranted
Underwater inspection apparatus and method
AssigneeBritish Technology Group Limited
InventorJohn Watson
Life of this patent
Estimating the term…
Abstract
A holographic recording and reproducing system for recording holographic images of an object positioned in a first medium and replaying said images in a second medium incorporates means for enhancing the relative sensitivity of the system to radiation capable of producing said holographic images.
Claims5
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.
1 more element
A holographic recording and reproducing system as claimed in any one of the preceding claims further comprising narrowband filter means selectively to pass radiation from said source to said recording means.
Dependencies are inferred from the claim text.