Characterization of an Ultra-Sensitive Transition-Edge Sensor for Space-Borne Far-IR/Sub-mm Spectroscopy
We measured the noise equivalent power (NEP) of an ultra-sensitive membrane-isolated transition-edge sensor (TES) designed for the SpicA FAR Infrared instrument (SAFARI) along with several Johnson noise Thermometry Devices (JTDs) simultaneously in a "dark" experimental setup. Our goal was...
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Veröffentlicht in: | IEEE transactions on applied superconductivity 2011-06, Vol.21 (3), p.199-202 |
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Sprache: | eng |
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Zusammenfassung: | We measured the noise equivalent power (NEP) of an ultra-sensitive membrane-isolated transition-edge sensor (TES) designed for the SpicA FAR Infrared instrument (SAFARI) along with several Johnson noise Thermometry Devices (JTDs) simultaneously in a "dark" experimental setup. Our goal was to characterize the dark power P D present in our experimental setup and its effect on the measured NEP. By employing resistive attenuators, filters, lossy coaxial connections, and a light-tight box, we reduced P D to 0.25 fW in our setup. For the TES, G was measured to be (325±25) fW/K at T C =78 mK giving an upper-limit expected NEP of (3.5±0.25)×10 -19 W/Hz 1/2 . We measured an actual NEP on the TES equal to (6.5±1.5)×10 -19 W/Hz 1/2 , which is approximately double the expected value and likely due to residual electrical dark power in our setup. |
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ISSN: | 1051-8223 1558-2515 |
DOI: | 10.1109/TASC.2010.2083612 |