23 November 2009 Fabrication and characterization of doubly cladding fiber optical temperature sensors
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Abstract
Fiber optical evanescent field sensors provide means of optical power sensitive to temperature. This paper proposed a novel and practicable fiber optical temperature sensor with doubly cladding structure. It worked on the basis of optical attenuation brought about by the outer cladding medium with a large thermooptic coefficient. As the external diameter of the sensing section was less than 1mm, the sensors were sensitive to the temperature of ambient air. The doubly cladding fiber optical sensors with different fabrication characteristics (basically length and the diameter of inner cladding of the sensing section) and external medium were studied experimentally. The sensor obtained by an outer cladding of Dow Corning OE-4110 showed a low insertion loss of -0.7dB, a peak value of power loss of -66dB at 51°C, and a linear dynamic range of -53dB for a temperature interval of 5°C at 1550nm. The sensor obtained by SILRES®Ren60 had the peak value of power loss at about 105°C and a temperature interval of 65°C in a linear dynamic range of -5 dB.
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Xiao-Kang Zhang, Xiao-Kang Zhang, Delin Yan, Delin Yan, } "Fabrication and characterization of doubly cladding fiber optical temperature sensors", Proc. SPIE 7508, 2009 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 750807 (23 November 2009); doi: 10.1117/12.837808; https://doi.org/10.1117/12.837808
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