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Open AccessArticle

Ultra-Sensitive Fiber Refractive Index Sensor with Intensity Modulation and Self-Temperature Compensation

1
College of Electronics Engineering, Heilongjiang University, Harbin 150080, China
2
Key lab of Electronics Engineering, College of Heilongjiang Province, Heilongjiang University, Harbin 150080, China
*
Authors to whom correspondence should be addressed.
Sensors 2019, 19(18), 3820; https://doi.org/10.3390/s19183820
Received: 13 August 2019 / Revised: 31 August 2019 / Accepted: 2 September 2019 / Published: 4 September 2019
(This article belongs to the Special Issue Refractive Index Sensors)
In this paper, a novel in-line modal interferometer for refractive index (RI) sensing is proposed and experimentally fabricated by cascading single-taper and multimode-double- cladding-multimode (MDM) fiber structure. Owing to evanescent field in taper area, the ultra-sensitive and linear intensity-responses to the varied surrounding RI are gained in both single- and double-pass structures. Moreover, the crosstalk from temperature can be effectively discriminated and compensated by means of the RI-free nature of MDM. The experimental results show that the RI sensitivities in single- and double-pass structures, respectively, reach 516.02 and 965.46 dB/RIU (RIU: refractive index unit), both with the slight wavelength shift (~0.2 nm). The temperature responses with respect to wavelength and intensity are 68.9 pm°C−1/0.103 dB°C−1 (single-pass structure) and 103 pm°C−1/0.082 dB·°C−1 (double-pass structure). So the calculated cross-sensitivity of intensity is constrained within 8.49 × 10−5 RIU/°C. In addition, our sensor presents high measurement-stability (~0.99) and low repeatability error (<4.8‰). On account of the ~620 μm size of taper, this compact sensor is cost-efficient, easy to fabricate, and very promising for the applications of biochemistry and biomedicine. View Full-Text
Keywords: refractive index sensor; modal interferometer; intensity demodulation; temperature compensation refractive index sensor; modal interferometer; intensity demodulation; temperature compensation
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MDPI and ACS Style

Li, Z.; Hou, L.; Ran, L.; Kang, J.; Yang, J. Ultra-Sensitive Fiber Refractive Index Sensor with Intensity Modulation and Self-Temperature Compensation. Sensors 2019, 19, 3820.

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