Combined distributed Raman and Bragg fiber temperature sensing using incoherent optical frequency domain reflectometry
Optical temperature sensors offer unique features which make them indispensable for key industries such as the energy sector. However, commercially available systems are usually designed to perform either distributed or distinct hot spot temperature measurements since they are restricted to one...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-02-01
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| Series: | Journal of Sensors and Sensor Systems |
| Online Access: | https://www.j-sens-sens-syst.net/7/91/2018/jsss-7-91-2018.pdf |
| Summary: | Optical temperature sensors offer unique features which make them
indispensable for key industries such as the energy sector. However,
commercially available systems are usually designed to perform either
distributed or distinct hot spot temperature measurements since they are
restricted to one measurement principle. We have combined two concepts,
fiber Bragg grating (FBG) temperature sensors and Raman-based distributed
temperature sensing (DTS), to overcome these limitations. Using a technique
called incoherent optical frequency domain reflectometry (IOFDR), it is
possible to cascade several FBGs with the same Bragg wavelength in one fiber
and simultaneously perform truly distributed Raman temperature measurements.
In our lab we have achieved a standard deviation of 2.5 K or better at a
spatial resolution in the order of 1 m with the Raman DTS. We have also
carried out a field test in a high-voltage environment with strong magnetic
fields where we performed simultaneous Raman and FBG temperature
measurements using a single sensor fiber only. |
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| ISSN: | 2194-8771 2194-878X |