Wide-band coherent receiver development for enhanced surveillance

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Oak Ridge National Laboratory (ORNL) has been developing advanced coherent IR heterodyne receivers for plasma diagnostics in fusion reactors for over 20 years. Recent progress in wide band IR detectors and high speed electronics has significantly enhanced the measurement capabilities of coherent receivers. In addition, developments in new HgCdTe and quantum well IR photodetector (QWIP) focal plane arrays are providing the possibility of both active and passive coherent imaging. In this paper the authors discuss the implications of these new enabling technologies to the IR remote sensing community for enhanced surveillance. Coherent receivers, as opposed to direct or thermal detection, ... continued below

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10 p.

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Simpson, M.L.; Richards, R.K. & Hutchinson, D.P. March 1, 1998.

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Oak Ridge National Laboratory (ORNL) has been developing advanced coherent IR heterodyne receivers for plasma diagnostics in fusion reactors for over 20 years. Recent progress in wide band IR detectors and high speed electronics has significantly enhanced the measurement capabilities of coherent receivers. In addition, developments in new HgCdTe and quantum well IR photodetector (QWIP) focal plane arrays are providing the possibility of both active and passive coherent imaging. In this paper the authors discuss the implications of these new enabling technologies to the IR remote sensing community for enhanced surveillance. Coherent receivers, as opposed to direct or thermal detection, provide multiple dimensions of information about a scene or target in a single detector system. Combinations of range, velocity, temperature, and chemical species information are all available from a coherent heterodyne receiver. They present laboratory data showing measured noise equivalent power (NEP) of new QWIP detectors with heterodyne bandwidths greater than 7 GHz. For absorption measurements, a wide band coherent receiver provides the capability of looking between CO{sub 2} lines at off-resonance peaks and thus the measurement of lines normally inaccessible with conventional heterodyne or direct detection systems. Also described are differential absorption lidar (DIAL) and Doppler laboratory measurements using an 8 x 8 HgCdTe focal plane array demonstrating the snapshot capability of coherent receiver detector arrays for enhanced chemical plume and moving hardbody capture. Finally they discuss a variety of coherent receiver configurations that can suppress (or enhance) sensitivity of present active remote sensing systems to speckle, glint, and other measurement anomalies.

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10 p.

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INIS; OSTI as DE98003390

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  • IRIS specialty meeting on active systems, Albuquerque, NM (United States), 4-6 Mar 1998

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  • Other: DE98003390
  • Report No.: ORNL/CP--96965
  • Report No.: CONF-980347--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 650303
  • Archival Resource Key: ark:/67531/metadc703011

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Office of Scientific & Technical Information Technical Reports

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  • March 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 3, 2016, 6:55 p.m.

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Simpson, M.L.; Richards, R.K. & Hutchinson, D.P. Wide-band coherent receiver development for enhanced surveillance, article, March 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc703011/: accessed June 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.