High-resolution slow-light fiber Bragg grating temperature sensor with phase-sensitive detection.
Opt Lett
; 43(14): 3337-3340, 2018 Jul 15.
Article
em En
| MEDLINE
| ID: mdl-30004500
ABSTRACT
This Letter reports a slow-light fiber Bragg grating (FBG) temperature sensor with a record temperature resolution of â¼0.3 m°C/âHz, a drift of only â¼1 m°C over the typical duration of a measurement (â¼30 s), and negligible self-heating. This sensor is particularly useful for applications requiring the detection of very small temperature changes, such as radiation-balanced lasers and the measurement of small absorptive losses using calorimetry. The sensor performance is demonstrated by measuring the heat generated in a pumped Yb-doped fiber. The sensor is also used to measure the slow-light FBG's very weak internal absorption loss (0.02 m-1), which is found to be only â¼2% of the total loss.
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MEDLINE
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En
Ano de publicação:
2018
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Article