SWIR Hemispherical Air-Glow Plotting System SHAPS

John D. Gonglewski; Michael M. Myers; David C. Dayton; Gregory Fertig; Jeffrey Allen; Rudolph Nolasco; Franscisco Maia

doi:10.1117/12.869248

11 October 2010 SWIR Hemispherical Air-Glow Plotting System SHAPS

John D. Gonglewski, Michael M. Myers, David C. Dayton, Gregory Fertig, Jeffrey Allen, Rudolph Nolasco, Franscisco Maia

Proceedings Volume 7828, Optics in Atmospheric Propagation and Adaptive Systems XIII; 78280D (2010) https://doi.org/10.1117/12.869248
Event: SPIE Remote Sensing, 2010, Toulouse, France

Abstract

It is well known that luminance from photo-chemical reactions of hydroxyl ions in the upper atmosphere (~85 km altitude) produces a significant amount of night time radiation in the short wave infra-red (SWIR) band of wave length 0.9 to 1.7 μm. Numerous studies of these phenomena have demonstrated that the irradiance shows significant temporal and spatial variations in the night sky. Changes in weather patterns, seasons, sun angle, moonlight, etc have the propensity to alter the SWIR air glow irradiance pattern. By performing multiple SWIR measurements a mosaic representation of the celestial hemisphere was constructed and used to investigate these variations over time and space. The experimental setup consisted of two sensors, an InGaAs SWIR detector and a visible astronomical camera, co-located and bore sighted on an AZ-EL gimbal. This gimbal was programmed to view most of the sky using forty five discrete azimuth and elevation locations. The dwell time at each location was 30 seconds with a total cycle time of less than 30 minutes. The visible astronomical camera collected image data simultaneous with the SWIR camera in order to distinguish SWIR patterns from clouds. Data was reduced through batch processing producing polar representations of the sky irradiance as a function of azimuth, elevation, and time. These spatiotemporal variations in the irradiance, both short and long term, can be used to validate and calibrate physical models of atmospheric chemistry and turbulence. In this paper we describe our experimental setup and present some results of our measurements made over several months in a rural marine environment on the Island of Kauai Hawaii.

Citation Download Citation

John D. Gonglewski, Michael M. Myers, David C. Dayton, Gregory Fertig, Jeffrey Allen, Rudolph Nolasco, and Franscisco Maia "SWIR Hemispherical Air-Glow Plotting System SHAPS", Proc. SPIE 7828, Optics in Atmospheric Propagation and Adaptive Systems XIII, 78280D (11 October 2010); https://doi.org/10.1117/12.869248

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KEYWORDS

Short wave infrared radiation

Cameras

Sensors

Clouds

Astronomy

Atmospheric modeling

CCD cameras

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