Accession Number : ADD008062

Title :   Imagery with Constant Range Lines.

Descriptive Note : Patent,


Personal Author(s) : Green,Leland D

Report Date : 23 Dec 1980

Pagination or Media Count : 7

Abstract : Method and apparatus for showing the relative range from an active line scan sensor to a target, the changes in range being shown on a recording medium as an alternate series of bright and dark lines. In particular, a modulated laser beam having high frequency components is utilized to illuminate the target, the reflected energy received at the sensor having the same modulation frequency but phase modified by the transit time required to make the roundtrip from the sensor to the target and return. The phase difference between the received energy and the transmitted, or reference, energy is detected by a phase demodulator, the detected phase difference corresponding to range contour lines. A reflectivity signal corresponding to the reflectance of the target is also provided. The range contour and reflectivity signals can be simultaneously recorded on a recording medium. Alternately, the reflectivity signal may be gated by the range contour signal producing a composite image on the medium. (Author)

Descriptors :   *Patents, *Optical detection, *Range finding, Line scanning, Laser beams, Circuit analysis, Limiters, Demodulators, Composite images, Image processing, Contours, Mode locked lasers, Gates(Circuits)

Subject Categories : Lasers and Masers
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE