Design And Performance Of The Cryogenic Focal Plane Optics Assembly For The Infrared Astronomical Satellite (IRAS)

J. A. Bamberg; N. H. Zaun

doi:10.1117/12.944982

1 February 1985 Design And Performance Of The Cryogenic Focal Plane Optics Assembly For The Infrared Astronomical Satellite (IRAS)

J. A. Bamberg, N. H. Zaun

Author Affiliations +

Proceedings Volume 0509, Cryogenic Optical Systems and Instruments I; (1985) https://doi.org/10.1117/12.944982
Event: 28th Annual Technical Symposium, 1984, San Diego, United States

Abstract

The Infrared Astronomical Satellite (IRAS) has successfully completed its mission of providing an unbiased all-sky survey of astronomical objects in the 8 to 120 micrometer wavelength region. The design and performance of the Focal Plane Optics Assembly (FPOA) for the IRAS instrument is described in this paper. The FPOA consists of 62 survey field stops, 62 individual small field lenses, 124 small spectral filters, and a precision multi-part aluminum housing. The FPOA is capable of repeated thermal cycling from ambient temperature to 2 Kelvin. The spectral filters, along with the detector spectral responses, provide infrared bandpasses of 8-15, 18-30, 46-78, and 85-117 micrometers. The combination of very long wavelengths, liquid helium temperatures, and small size provided a significant design challenge. Spectral filter and field lens designs for the four spectral bands are described. Also, discussed are techniques which were developed for mechanical mounting of the small lenses and spectral filters, and to assure their optical alignment.

Citation Download Citation

J. A. Bamberg and N. H. Zaun "Design And Performance Of The Cryogenic Focal Plane Optics Assembly For The Infrared Astronomical Satellite (IRAS)", Proc. SPIE 0509, Cryogenic Optical Systems and Instruments I, (1 February 1985); https://doi.org/10.1117/12.944982

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