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Proceedings Paper

Measurable refractive index range for a doubly cladding single mode fiber sensor and its application in temperature and humidity sensing
Author(s): Xiao-Kang Zhang; Lu Lan; Zhen Kong; Lihua Chen; Zhiren Ye
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Paper 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.

Paper Details

Date Published: 9 November 2010
PDF: 9 pages
Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 78530H (9 November 2010); doi: 10.1117/12.870121
Show Author Affiliations
Xiao-Kang Zhang, South China Univ. of Technology (China)
Lu Lan, South China Univ. of Technology (China)
Zhen Kong, South China Univ. of Technology (China)
Lihua Chen, South China Univ. of Technology (China)
Zhiren Ye, South China Univ. of Technology (China)


Published in SPIE Proceedings Vol. 7853:
Advanced Sensor Systems and Applications IV
Brian Culshaw; Yanbiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan; Lin Zhang, Editor(s)

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