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9 November 2010 Measurable refractive index range for a doubly cladding single mode fiber sensor and its application in temperature and humidity sensing
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Abstract
A new type of evanescent field sensors based on a doubly cladding single mode fiber is proposed. The theoretical analysis shows that the measurable refractive index (RI) ranges for the sensors are limited in the single mode in the fiber becoming leaky and the range is less than the RI difference between the core and the cladding of the fibers. Two temperature sensors and a humidity sensor were fabricated. One temperature sensor showed a good linear response in a range of 60°C, the modulation depth of 40 dB, and the insertion loss of -1.4 dB. The humidity sensors fabricated by agarose gel had a measurable moisture range of 16 ~ 100% of RH. Its optical power variation with humidity is 8.5 dB and insertion loss is 3.9 dB. We confirmed that the DC single mode fiber sensors became a new type of intensity sensors characterized in good linear response, low insertion loss, high modulation depth, and low cost in fabrication.
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Xiao-Kang Zhang, Lu Lan, Zhen Kong, Lihua Chen, and Zhiren Ye "Measurable refractive index range for a doubly cladding single mode fiber sensor and its application in temperature and humidity sensing", Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 78530H (9 November 2010); https://doi.org/10.1117/12.870121
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