DocumentCode :
2749446
Title :
Fiber-coupled electrical-substitution picowatt cryogenic radiometer
Author :
Tomlin, N.A. ; Lehman, J.H. ; Nam, S.
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
fYear :
2012
fDate :
1-6 July 2012
Firstpage :
452
Lastpage :
453
Abstract :
We describe a picowatt cryogenic radiometer (PCR) fabricated lithographically for electrical-substitution optical fiber power measurements. The absorber, electrical heater, and thermometer are all on a micro-machined membrane less than 1mm on a side. The PCR is sensitive to input powers from 50fW to 65pW, has a noise equivalent power of 2 × 10-15W/√Hz, and an effective time constant below 100 ms. A comparison of the response to electrical and optical input powers yields a response standard deviation below ·0.3% (k = 2) for input optical powers of 12pW to 65pW.
Keywords :
cryogenics; fibre optic sensors; optical variables measurement; photolithography; power measurement; radiometers; PCR; absorber; electrical heater; electrical input powers; electrical-substitution optical fiber power measurements; fiber-coupled electrical-substitution picowatt cryogenic radiometer; micromachined membrane; optical input powers; power 12 pW to 65 pW; power 50 fW; response standard deviation; thermometer; Cryogenics; Optical attenuators; Optical fiber sensors; Optical fibers; Optical variables measurement; Radiometry; TES; cryogenic radiometer; electrical substitution; pW; picowatt; radiometer; transition-edge sensor;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2012 Conference on
Conference_Location :
Washington, DC
ISSN :
0589-1485
Print_ISBN :
978-1-4673-0439-9
Type :
conf
DOI :
10.1109/CPEM.2012.6250998
Filename :
6250998
Link To Document :
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