Article ID Journal Published Year Pages File Type
1784641 Infrared Physics & Technology 2013 5 Pages PDF
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
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