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La0.7Sr0.3MnO3 (LSMO) suspended bolometers of various geometries have been fabricated using silicon micromachining techniques. Thanks to adequate geometry design and to the operating conditions (temperature and bias current), these uncooled bolometers could be limited by phonon noise and achieve NEP values below 1 pW Hz−1/2 around 300 K.
Sensitivity, one of the most important parameter of a radio telescope, is highly depended on the dish optical design for a dish-type telescope. This paper presents several ways to improve the sensitivity, i.e., higher aperture efficiency and lower noise temperature in dish optical design, for example, dish optical configuration selection, beam shaping, and reflector extension.
Temperature and strain sensitivities of fiber Bragg grating inscribed in silica-germanate fiber are experimentally investigated. Thanks to the different sensitivities of individual resonance peaks, the configuration has the potential to measure these two parameters simultaneously.
We report our results on uncooled La0.7Sr0.3MnO3 (LSMO) suspended bolometers fabricated using silicon micromachining techniques. Suspended LSMO bridges showed very low effective thermal conductance (~10-7 W K-1) and very low NEP value (~ 1 pW Hz-1/2) at 300K.
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