Image analysis – Applications – Target tracking or detecting
Patent
1995-05-24
1998-05-12
Johns, Andrew W.
Image analysis
Applications
Target tracking or detecting
356 285, 342 53, G06K 900
Patent
active
057518300
ABSTRACT:
A coherent camera system performs ranging, spectroscopy, and thermal imaging. Local oscillator radiation is combined with target scene radiation to enable heterodyne detection by the coherent camera's two-dimensional photodetector array. Versatility enables deployment of the system in either a passive mode (where no laser energy is actively transmitted toward the target scene) or an active mode (where a transmitting laser is used to actively illuminate the target scene). The two-dimensional photodetector array eliminates the need to mechanically scan the detector. Each element of the photodetector array produces an intermediate frequency signal that is amplified, filtered, and rectified by the coherent camera's integrated circuitry. By spectroscopic examination of the frequency components of each pixel of the detector array, a high-resolution, three-dimensional or holographic image of the target scene is produced for applications such as air pollution studies, atmospheric disturbance monitoring, and military weapons targeting.
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Johns Andrew W.
Lockheed Martin Energy Systems, Inc.
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