Imagery with Constant Range Lines.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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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
- Lasers and Masers
- Optical Detection and Detectors