Near-field reflection measurements of lightweight absorbers in the millimeter-wavelengths for space missions

Fumiya Miura; Hayato Takakura; Yutaro Sekimoto; Junji Inatani; Frederick Matsuda; Shugo Oguri; Miu Kashiwazaki; Shogo Nakamura; Tomonaga Ueno; Akira Ito; Motoi Kawamura; Osamu Kawasaki; Atsushi Sakai

doi:10.1117/12.3016033

16 August 2024 Near-field reflection measurements of lightweight absorbers in the millimeter-wavelengths for space missions

Fumiya Miura, Hayato Takakura, Yutaro Sekimoto, Junji Inatani, Frederick Matsuda, Shugo Oguri, Miu Kashiwazaki, Shogo Nakamura, Tomonaga Ueno, Akira Ito, Motoi Kawamura, Osamu Kawasaki, Atsushi Sakai

Author Affiliations +

Proceedings Volume 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII; 131021S (2024) https://doi.org/10.1117/12.3016033
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The development of millimeter-wave absorbers for astronomical instruments is an important area of research regarding stray light suppression. Millimeter-wave absorbers for space missions should be selected based not only on their broadband performance at oblique incidence but also on their polarization characteristics, weight, and radiation tolerance. LiteBIRD is a space telescope designed to test inflationary theories by observing the polarization of the cosmic microwave background (CMB). The Low-Frequency Telescope (LFT) on board LiteBIRD needs to know the far side lobes at the −56 dB level, so surrounding it with millimeter-wave absorbers suppresses stray light. Because even the smallest stray light reflection may cause non-negligible far side lobes in the millimeter-wave absorber inside the telescope, it is necessary to accurately measure the reflectance of the millimeter-wave absorber not only specular reflection but also diffuse reflection. We performed near-field reflection measurements of a new lightweight absorber for two polarizations with a 30 degree angle of incidence in the frequency range between 70 GHz and 110 GHz. Measurements showed a reflectance of -16 dB for TE and -19 dB for TM, lower than the industry standard Eccosorb AN-72. In addition, we evaluated radiation tolerance and confirmed that the difference in reflectance before and after exposure was within 3 dB.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Fumiya Miura, Hayato Takakura, Yutaro Sekimoto, Junji Inatani, Frederick Matsuda, Shugo Oguri, Miu Kashiwazaki, Shogo Nakamura, Tomonaga Ueno, Akira Ito, Motoi Kawamura, Osamu Kawasaki, and Atsushi Sakai "Near-field reflection measurements of lightweight absorbers in the millimeter-wavelengths for space missions", Proc. SPIE 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, 131021S (16 August 2024); https://doi.org/10.1117/12.3016033

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KEYWORDS

Reflectivity

Reflection

Aluminum

Polarization

Near field

Telescopes

Specular reflections

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