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  • 1
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    Conically scanned lidar telescope using holographic optical elements (1992)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: Holographic optical elements (HOE) using volume phase holograms make possible a new class of lightweight scanning telescopes having advantages for lidar remote sensing instruments. So far, the only application of HOE's to lidar has been a non-scanning receiver for a laser range finder. We introduce a large aperture, narrow field of view (FOV) telescope used in a conical scanning configuration, having a much smaller rotating mass than in conventional designs. Typically, lidars employ a large aperture collector and require a narrow FOV to limit the amount of skylight background. Focal plane techniques are not good approaches to scanning because they require a large FOV within which to scan a smaller FOV mirror or detector array. Thus, scanning lidar systems have either used a large flat scanning mirror at which the receiver telescope is pointed, or the entire telescope is steered. We present a concept for a conically scanned lidar telescope in which the only moving part is the HOE which serves as the primary collecting optic. We also describe methods by which a multiplexed HOE can be used simultaneously as a dichroic beamsplitter.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Langley Research Center, 16th International Laser Radar Conference, Part 2; p 521-524
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Differential absorption lidars for remote sensing of atmospheric pressure and temperature profiles (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A near infrared differential absorption lidar technique is developed using atmospheric oxygen as a tracer for high resolution vertical profiles of pressure and temperature with high accuracy. Solid-state tunable lasers and high-resolution spectrum analyzers are developed to carry out ground-based and airborne measurement demonstrations and results of the measurements presented. Numerical error analysis of high-altitude airborne and spaceborne experiments is carried out, and system concepts developed for their implementation.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-104618 , NAS 1.15:104618 , REPT-95B00061 , NIPS-96-08347
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    NASA's program in lidar remote sensing (1991)
    In:  Other Sources
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    Publication Date: 2019-08-27
    Description: Several major NASA research efforts in lidar remote sensing are reviewed, with attention given to hardware and key sensor issues along with results and expectations. The discussion covers temperature and pressure measurements, measurements methods and instrumentation, pressure data, wind field measurements, atmospheric backscatter measurement, aerosol and cloud measurements, and water vapor measurement. Consideration is also given to the applicability of lidar measurements to problems of operational weather analysis and forecasting, climate studies, mesoscale and severe storm analysis and forecastig, and studies of atmosphere/surface interface.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: Earth and atmospheric remote sensing; Proceedings of the Meeting, Orlando, FL, Apr. 2-4, 1991 (A93-24176 08-42); p. 2-23.
    Format: text
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    NASA TECHNICAL REPORTS
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