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Refractive index and temperature optical fiber sensor based on thin core S-taper and spherical structure

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Abstract

A Mach-Zehnder interferometer (MZI) for simultaneously measuring refractive index (RI) and temperature is proposed and verified in this paper. The sensor head is composed of thin core fiber (TCF) S-taper structure and spherical structure. By monitoring two interference dips, experimental results show that the RI sensitivities are −70.392 nm/RIU and −60.08 nm/RIU in the RI range of 1.338 4–1.350 0, respectively. And the temperature sensitivities are 0.050 72 nm/°C and 0.071 7 nm/°C in the temperature range of 30–70 °C, respectively. The simultaneous measurement of the temperature and external RI is demonstrated based on the sensitive matrix. The sensor also has the advantages of low cost, simple structure and high sensitivity.

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References

  1. WU Q, SEMENOVA Y, WANG P, et al. High sensitivity SMS fiber structure based refractometer-analysis and experiment[J]. Optics express, 2011, 19(9): 7937–7944.

    Article  ADS  Google Scholar 

  2. CAO Y, LIU H, TONG Z R, et al. Simultaneous measurement of temperature and refractive index based on a core-offset Mach-Zehnder interferometer cascaded with a long-period fiber grating[J]. Optoelectronics letters, 2015, 11(1): 69–72.

    Article  ADS  Google Scholar 

  3. GAO S C, ZHANG W G, GENG P C, et al. Highly sensitive in-fiber refractive index sensor based on down-bitaper seeded up-bitaper pair[J]. IEEE photonics technology letters, 2012, 24(20): 1878–1881.

    Article  ADS  Google Scholar 

  4. MA G M, JIANG J, MU R D, et al. High sensitive FBG sensor for equivalent salt deposit density measurement[J]. IEEE photonics technology letters, 2014, 27(2): 177–180.

    Article  ADS  Google Scholar 

  5. LIU Q, WANG S W, FU X H, et al. Refractive index insensitive temperature sensor based on waist-enlarged few mode fiber bitapers[J]. Optoelectronics letters, 2017, 13(1): 25–28.

    Article  ADS  Google Scholar 

  6. WANG Y Q, SHEN C Y, LOU W M, et al. Fiber optic relative humidity sensor based on the tilted fiber Bragg grating coated with graphene oxide[J]. Applied physics letters, 2016, 109(3): 031107.

    Article  ADS  Google Scholar 

  7. TIAN K, ZHANG M, FARRELL G, et al. Highly sensitive strain sensor based on composite interference established within S-tapered multimode fiber structure[J]. Optics express, 2018, 26(26): 33982–33992.

    Article  ADS  Google Scholar 

  8. WU W W, CAO Y, ZHANG H, et al. Compact magnetic field sensor based on a magnetic-fluid-integrated fiber interferometer[J]. IEEE magnetics letters, 2019, 10: 1–5.

    Article  ADS  Google Scholar 

  9. ZHONG Y M, TONG Z R, SONG D Y, et al. Refractive index and temperature sensor based on cleaved taper and spherical structure[J]. Optoelectronics letters, 2020, 16(3): 171–175.

    Article  ADS  Google Scholar 

  10. LIU H F, MIAO Y P, LIU B, et al. Relative humidity sensor based on S-taper fiber coated with SiO2 nanoparticles[J]. IEEE sensors journal, 2015, 15(6): 3424–3428.

    Article  ADS  Google Scholar 

  11. CHEN C, YANG R, ZHANG X Y, et al. Compact refractive index sensor based on an S-tapered fiber probe[J]. Optical materials express, 2018, 8(4): 919–925.

    Article  ADS  Google Scholar 

  12. ZHAO J F, NIU P P, ZHANG C, et al. Temperature-compensated fiber laser refractometer based on compact hybrid S-taper/FBG structure[J]. Optical fiber technology, 2018, 45: 300–305.

    Article  ADS  Google Scholar 

  13. LI M Q, CAO Y, ZHANG H, et al. Strain and temperature sensor based on S-taper embedded in long-period grating[J]. Optical engineering, 2020, 59(9): 097105.

    Article  ADS  Google Scholar 

  14. YIN X L, ZHOU R X. Compact vector fiber-optic displacement sensor using an asymmetric Mach-Zehnder interferometer[J]. Optics communications, 2017, 400: 74–78.

    Article  ADS  Google Scholar 

  15. DONG X R, DU H F, LUO Z, et al. Highly sensitive strain sensor based on a novel Mach-Zehnder interferometer with TCF-PCF structure[J]. Sensors, 2018, 18(1): 278.

    Article  ADS  Google Scholar 

  16. LI J L, ZHANG W G, GAO S C, et al. Long-period fiber grating cascaded to an S fiber taper for simultaneous measurement of temperature and refractive index[J]. IEEE photonics technology letters, 2013, 25(9): 888–891.

    Article  ADS  Google Scholar 

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Authors and Affiliations

  1. School of Electronic and Information, Qingdao University, Qingdao, 266071, China

    Fan Yang, Ye Cao, Meiqi Li & Hui Ju

  2. College of Electronic Information Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Lijun Li

Authors
  1. Fan Yang
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  2. Ye Cao
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  3. Meiqi Li
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  4. Hui Ju
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  5. Lijun Li
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Corresponding author

Correspondence to Ye Cao.

Additional information

This work has been supported by the National High Technology Research and Development Program of China (No.2013AA014200), the National Natural Science Foundation of China (No.11444001), and the Municipal Natural Science Foundation of Tianjin (No.14JCYBJC16500).

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The authors declare that there are no conflicts of interest related to this article.

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Yang, F., Cao, Y., Li, M. et al. Refractive index and temperature optical fiber sensor based on thin core S-taper and spherical structure. Optoelectron. Lett. 18, 321–325 (2022). https://doi.org/10.1007/s11801-022-1153-3

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  • DOI: https://doi.org/10.1007/s11801-022-1153-3

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