Infrared Astronomical Satellite (IRAS) analysis, introduction

Details Infrared Astronomical Satellite (IRAS) analysis, introduction Infrared Astronomical Satellite (IRAS) analysis, introduction

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978iras.reptq.....&link_type=abstract

In its Infrared Astron. Satellite (IRAS) Anal. 109 p (SEE N81-29964 20-74)

Physics

Optics

Analysis (Mathematics), Computer Programs, Diffraction Propagation, Infrared Astronomy Satellite, Light Transmission, Numerical Analysis, Transmittance, Geometrical Optics, Infrared Radiation, Infrared Telescopes, Light Scattering, Mathematical Models, Radiation Sources, Scatter Propagation, Subroutines

Scientific paper

Stray light transmittance analysis on a design of the Infrared Astronomical Satellite (IRAS) is presented. The system was evaluated for scattered radiation propagation with the use of the APART (Arizon's Paraxial Analysis of Radiation Transfer), and the propagation of diffracted energy with both PADE (Paraxial Analysis of Diffracted Energy) and the GUERAP II programs. The scattered radiation analysis was performed by using both a 5% diffuse black on the baffle and vane surfaces and by using a mathematical model of the Martin Black scattering characteristics. The sources of infrared radiation and of radiation in the visible wavelengths are identified. Diffraction effects are dominant only at the large off-axis angles, except for a few specific cases and smaller angles. At the longer wavelengths the diffraction contributions go up significantly. It is the comparative increase which determines which propagation process predominates. Combined transmittance values are presented.

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