Accession Number : ADD015882

Title :   High Spatial Resolution, Range Gated, Underwater Imaging Method and Apparatus.

Descriptive Note : Patent Application, Filed 30 Jun 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : McLean, Edgar A

Report Date : 30 Jun 1993

Pagination or Media Count : 22

Abstract : 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

Descriptors :   *CAMERA SHUTTERS, *OPTICAL DETECTION, *OPTICAL IMAGES, *LIGHT SCATTERING, *PATENT APPLICATIONS, *UNDERWATER OBJECTS, UNDERWATER TRACKING, SUSPENDED SEDIMENTS, VISIBILITY, PULSED LASERS, TURBIDITY, REFLECTION, HIGH RESOLUTION, BACKSCATTERING, PHOTODIODES, MIRRORS, CHARGE COUPLED DEVICES

Subject Categories : Optical Detection and Detectors
      Photography

Distribution Statement : APPROVED FOR PUBLIC RELEASE