Optimization of a Microwave Polarimeter for Astronomy with Optical Correlation and Detection

Autor:	Francisco Javier Casas Reinares, Patricio Vielva, Guillermo Pascual Cisneros
Rok vydání:	2023
Předmět:	astronomy polarization microwave synthesized imaging Cosmic Microwave Background photonics direct imaging interferometry Electrical and Electronic Engineering Biochemistry Instrumentation Atomic and Molecular Physics and Optics Analytical Chemistry
Zdroj:	Sensors Volume 23 Issue 5 Pages: 2414
ISSN:	1424-8220
Popis:	Cosmic Microwave Background (CMB) B-modes detection is the main focus of future CMB experiments because of the valuable information it contains, particularly to probe the physics of the very early universe. For this reason, we have developed an optimized polarimeter demonstrator sensitive to the 10–20 GHz band in which the signal received by each antenna is modulated into a Near Infrared (NIR) laser by a Mach–Zehnder modulator. Then, these modulated signals are optically correlated and detected using photonic back-end modules consisting of voltage-controlled phase shifters, a 90-degree optical hybrid, a pair of lenses, and an NIR camera. During laboratory tests, a 1/f-like noise signal related to the low phase stability of the demonstrator has been found experimentally. To solve this issue, we have developed a calibration method that allows us to remove this noise in an actual experiment, until obtaining the required accuracy level in the measurement of polarization.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46e4d22be1033e1c05c4337d10d25317 https://doi.org/10.3390/s23052414 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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