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Proceedings Paper

Temperature self-compensation refractometer based on cascaded SNS-FBG structure for multipoint measurement
Author(s): Liqing Wang; Dan Yang; Cheng Zhang; Changyun Miao
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Paper Abstract

A fiber optic refractive index (RI) sensor that consists of cascaded single mode fiber-no core fiber-single mode fiber (SNS) structure followed by a fiber Bragg grating (FBG) was proposed and demonstrated. Because the SNS structure and FBG have similar temperature characteristics and the FBG is not sensitivity to the RI, temperature self-compensation during the RI measurement can be realized by calculating the difference between the characteristic wavelengths of the SNS and FBG. Three SNS-FBG-based sensors with different lengths of the NCF and different Bragg wavelengths were cascaded to achieve wavelength division multiplexing (WDM) in the range of 1510nm-1590nm. Experimental results show that three-point independent RI measurement can be accomplished with the maximum sensitivity of 211.088, 243.429 and 242.511nm/RIU (RI unit) in the RI range from 1.333 to 1.405, respectively. The RI errors caused by temperature are only 4.548×10-5RIU/°C, 3.779×10-5RIU/°C and 4.458×10-5RIU/°C respectively. These sensors feature the advantages of good reproducibility, small size, low cost, high sensitivity and very low temperature cross-sensitivity, which have a good practical prospect in the simultaneous multi-point RI measurement application area.

Paper Details

Date Published: 23 October 2018
PDF: 9 pages
Proc. SPIE 10821, Advanced Sensor Systems and Applications VIII, 1082111 (23 October 2018); doi: 10.1117/12.2322125
Show Author Affiliations
Liqing Wang, Tianjin Key Lab. of Optoelectronic Detection Technology and Systems (China)
Tianjin Polytechnic Univ. (China)
Dan Yang, Tianjin Key Lab. of Optoelectronic Detection Technology and Systems (China)
Tianjin Polytechnic Univ. (China)
Cheng Zhang, Tianjin Key Lab. of Optoelectronic Detection Technology and Systems (China)
Tianjin Polytechnic Univ. (China)
Changyun Miao, Tianjin Key Lab. of Optoelectronic Detection Technology and Systems (China)
Tianjin Polytechnic Univ. (China)


Published in SPIE Proceedings Vol. 10821:
Advanced Sensor Systems and Applications VIII
Tiegen Liu; Shibin Jiang, Editor(s)

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