Design and fabrication of infrared filters for remote sounding instrumentation
Hawkins, G. J. and Hunneman, R. (1994) Design and fabrication of infrared filters for remote sounding instrumentation. In: Dewandre, T. M. , Schulte-in-den-Baeumen , J. J. and Sein, E. (eds.) Space Optics 1994: Space Instrumentation and Spacecraft Optics. SPIE Proceedings (2210). SPIE Press, Bellingham, WA, pp. 639-651. ISBN 9780819415141
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To link to this article DOI: 10.1117/12.188124
Cooled infrared filters have been used in pressure modulation and filter radiometry to measure the dynamics, temperature distribution and concentrations of atmospheric elements in various satellite radiometers. Invariably such instruments use precision infrared bandpass filters and coatings for spectral selction, often operating at cryogenic temperatures. More recent developments in the use of spectrally-selective cooled detectors in focal plane arrays have simplified the optical layout and reduced the component count of radiometers but have placed additional demands on both the spectral and physical performance requirements of the filters. This paper describes and contrasts the more traditional radiometers using discrete detectors with those which use focal plane detector array technology, with particular emphasis on the function of the filters and coatings in the two cases. Additionally we discuss the spectral techniques and materials used to fabricate infrared coatings and filters for use in space optics, and give examples of their application in the fabrication of some demanding long wavelength dichroics and filters. We also discuss the effects of the space environment on the stability and durability of high performance infrared filters and materials exposed to low Earth orbit for 69 months on the NASA Long Duration Exposure Facility (LDEF).