Method and apparatus for coherent imaging of infrared energy

Patent · Tue May 12 04:00:00 EDT 1998

OSTI ID:644410

Hutchinson, D P

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. 8 figs.

• Research Organization: Lockheed Martin Energy Syst Inc
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• Assignee: Lockheed Martin Energy Systems, Inc., Oak Ridge, TN (United States)
• Patent Number(s): US 5,751,830/A/
• Application Number: PAN: 8-449,715
• OSTI ID: 644410
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION MONITORS
CAMERAS
DESIGN
IMAGES
INFRARED RADIATION
LASER RADIATION
MILITARY EQUIPMENT
RANGE FINDERS
THERMAL RADIATION
THERMOGRAPHY