期刊
INFRARED PHYSICS & TECHNOLOGY
卷 90, 期 -, 页码 59-65出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.infrared.2018.02.008
关键词
Far infrared and millimeter wavelengths; Polymer material; Optical features; Astronomy and astrophysics
资金
- ASI (Agenzia Spaziale Italiana)
- PNRA (Italian National Antarctic Research Program)
- Sapienza University of Rome research-startup funds
- OLIMPO
- Millimetron
The next generation of experiments for the measurement of the Cosmic Microwave Background (CMB) requires more and more the use of advanced materials, with specific physical and structural properties. An example is the material used for receiver's cryostat windows and internal lenses. The large throughput of current CMB experiments requires a large diameter (of the order of 0.5 m) of these parts, resulting in heavy structural and optical requirements on the material to be used. Ultra High Molecular Weight (UHMW) polyethylene (PE) features high resistance to traction and good transmissivity in the frequency range of interest. In this paper, we discuss the possibility of using UHMW PE for windows and lenses in experiments working at millimeter wavelengths, by measuring its optical properties: emissivity, transmission and refraction index. Our measurements show that the material is well suited to this purpose. (C) 2018 Elsevier B.V. All rights reserved.
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