High Spatial Resolution, Range Gated, Underwater Imaging Method and Apparatus.
Patent Application, Filed 30 Jun 93,
DEPARTMENT OF THE NAVY WASHINGTON DC
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This patent application discloses a method and apparatus for imaging objects in turbid mediums, such as water then invention using a laser pulse, a detector of the reflected laser pulse, and a shutter on the detector. The shutter is kept closed except at the excepted return time of the laser pulse from the reflected object to be detected and identified at which time the shutter is opened to permit the detector to receive the reflected lase pulse. Typically, laser pulses with widths of about 100 to about 500 psecs are used. In addition, typical shutter times or gate width of about 100 to about 500 psecs are also used. Gate widths on the order of 120 psecs are preferred. The detector or GOI camera is shielded from spurious signals, most notably, scattered laser light from the turbid medium
- Optical Detection and Detectors