Title :
Absorbing coatings and diffuse reflectors for the Herschel platform sub-millimeter spectrometers HIFI and PACS
Author :
Klaassen, Tjeerd O. ; Blok, John H. ; Hovenier, J. Niels ; Jakob, Gerd ; Rosenthal, Dirk ; Wildeman, Klaas J.
Author_Institution :
Dept. of Imaging Sci. & Technol., Delft Univ. of Technol., Netherlands
Abstract :
Absorbing coatings for the HIFI and PACS spectrometers aboard the Herschel platform have been developed and optically characterized. Using radiation from an optically pumped far-infrared laser at wavelengths in the 90-900 μm range, the specular as well as the diffuse reflection - described by the bi-directional reflection distribution function - have been determined. The influence of polarization has been addressed too. Moreover, the absorption of non-absorbing diffusely reflecting surfaces, to be used for integrating spheres, has been determined using a calorimetric method.
Keywords :
aerospace instrumentation; coatings; electromagnetic wave absorption; electromagnetic wave reflection; rough surfaces; submillimetre wave spectroscopy; HIM; Herschel platform; PACS; absorbing coatings; bi-directional reflection distribution function; calorimetric method; diffuse reflectors; far-infrared laser; integrating spheres; nonabsorbing diffusely reflecting surfaces; optically pumped FIR laser; polarization; submillimeter spectrometers; Bidirectional control; Coatings; Distribution functions; Laser excitation; Optical polarization; Optical pumping; Optical reflection; Picture archiving and communication systems; Pump lasers; Spectroscopy;
Conference_Titel :
Terahertz Electronics Proceedings, 2002. IEEE Tenth International Conference on
Print_ISBN :
0-7803-7630-7
DOI :
10.1109/THZ.2002.1037582
