Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1784641 | Infrared Physics & Technology | 2013 | 5 Pages |
Abstract
We have measured, using a custom setup, the emissivity of metallic wire-grids, suitable for polarimeters and interferometers at mm and far infrared wavelengths. We find that the effective emissivity of these devices is of the order of a few %, depending on fabrication technology and aging. We discuss their use in astronomical instruments, with special attention to Martin–Puplett Interferometers in low-background applications, like astronomical observations of the Cosmic Microwave Background.
► We measured the emissivity of metal wire-grids at 150 GHz using a custom setup. ► This is a few %, larger than the emissivity of typical mirrors at 150 GHz. ► This dominates the background in room-temperature interferometers and polarimeters.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Atomic and Molecular Physics, and Optics
Authors
A. Schillaci, E. Battistelli, G. D’ Alessandro, P. de Bernardis, S. Masi,