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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 16 — Jun. 1, 2010
  • pp: 3082–3091

In-flight spectral performance monitoring of the Airborne Prism Experiment

Petra D’Odorico, Edoardo Alberti, and Michael E. Schaepman  »View Author Affiliations


Applied Optics, Vol. 49, Issue 16, pp. 3082-3091 (2010)
http://dx.doi.org/10.1364/AO.49.003082


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Abstract

Spectral performance of an airborne dispersive pushbroom imaging spectrometer cannot be assumed to be stable over a whole flight season given the environmental stresses present during flight. Spectral performance monitoring during flight is commonly accomplished by looking at selected absorption features present in the Sun, atmosphere, or ground, and their stability. The assessment of instrument performance in two different environments, e.g., laboratory and airborne, using precisely the same calibration reference, has not been possible so far. The Airborne Prism Experiment (APEX), an airborne dispersive pushbroom imaging spectrometer, uses an onboard in-flight characterization (IFC) facility, which makes it possible to monitor the sensor’s performance in terms of spectral, radiometric, and geometric stability in flight and in the laboratory. We discuss in detail a new method for the monitoring of spectral instrument performance. The method relies on the monitoring of spectral shifts by comparing instrument-induced movements of absorption features on ground and in flight. Absorption lines originate from spectral filters, which intercept the full field of view (FOV) illuminated using an internal light source. A feature-fitting algorithm is used for the shift estimation based on Pearson’s correlation co efficient. Environmental parameter monitoring, coregistered on board with the image and calibration data, revealed that differential pressure and temperature in the baffle compartment are the main driving parameters explaining the trend in spectral performance deviations in the time and the space (across-track) domains, respectively. The results presented in this paper show that the system in its current setup needs further improvements to reach a stable performance. Findings provided useful guidelines for the instrument revision currently under way. The main aim of the revision is the stabilization of the instrument for a range of temperature and pressure conditions to be encountered during operation.

© 2010 Optical Society of America

OCIS Codes
(110.0110) Imaging systems : Imaging systems
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(300.0300) Spectroscopy : Spectroscopy

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: February 22, 2010
Revised Manuscript: April 23, 2010
Manuscript Accepted: April 23, 2010
Published: May 26, 2010

Citation
Petra D’Odorico, Edoardo Alberti, and Michael E. Schaepman, "In-flight spectral performance monitoring of the Airborne Prism Experiment," Appl. Opt. 49, 3082-3091 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-16-3082

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