Chaudhuri, Sandipan S.

NASA NTRS1998

Operation of the Prototype Holographic Atmospheric Scanner for Environmental Remote Sensing (PHASERS)

This study represents the first successful employment of the Holographic Optical Telescope and Scanner (HOTS) technology to make atmospheric backscattering measurements in a scanning mode. In several independent attempts the system successfully detected the return signal from atmospheric structures as they moved across the field-of-view (FOV) of the rotating Holographic Optical Element (HOE). Future plans include the addition of a narrow band filter and the necessary optics for day-time measurements, along with additional automation of the system and its data handling. In part, due to the success of this demonstration of the HOTS technology a new class of light weight scanning telescopes for lidar remote sensing from air and space craft platforms are under development and being tested for additional applications.

Guerra, David V.↗

NASA NTRS1995

Prototype Holographic Atmospheric Scanner for Environmental Remote Sensing (PHASERS)

A ground-based atmospheric lidar system that utilizes a Holographic Optical Telescope and Scanner has been developed and successfully operated to obtain atmospheric backscatter profiles. The Prototype Holographic Atmospheric Scanner for Environmental Remote Sensing is built around a volume phase reflection Holographic Optical Element. This single optical element both directs and collimates the outgoing laser beam as well as collects, focuses, and filters the atmospheric laser backscatter, while offering significant weight savings over existing telescope mirror technology. Conical scanning is accomplished as the HOE rotates on a turntable sweeping the 1.2 mrad field of view around a 42deg cone. During this technology demonstration, atmospheric aerosol and cloud return signals have been received in both stationary and scanning modes. The success of this program has led to the further development of this technology for integration into airborne and eventually satellite earth observing scanning lidar telescopes.

Guerra, David V.↗