Simultaneous measurement of temperature and strain based on a hollow core Bragg fiber

Yu Wang, Yan Zhou, Xinyu Wang, Daru Chen, Zhenggang Lian, Chao Lu, Hwa Yaw Tam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)


A novel, to the best of our knowledge, reflective sensor fabricated by simply sandwiching a homemade hollow core Bragg fiber (HCBF) between two single-mode fibers is proposed and demonstrated for the simultaneous measurement of the temperature and the strain. Different from traditional Fabry–Perot interferometer (FPI) sensors that can achieve only one-parameter sensing with inevitable cross-correspondence to other parameters, the proposed sensor based on the HCBF, which functions as an FPI-inducing FPI spectrum pattern and a weak waveguide confining light-inducing periodic envelope in reflection spectrum, ensures double-parameter sensing. For the HCBF-based reflective sensor, different sensing mechanisms lead to the various sensitivity values of temperature and strain (2.98 pm/C, 19.4 pm/C, 2.02 pm/µε, −0.36 pm/µε), resulting in a different shift of the confining spectrum envelope and the FPI spectrum fringe. Experimental results indicate that our proposed sensor can measure temperature and strain simultaneously by utilizing a 2 × 2 matrix. Taking advantage of the compact size, easy fabrication, and low cost, this sensor has an applicable value in harsh environment for simultaneous strain and temperature sensing.

Original languageEnglish
Pages (from-to)6122-6125
Number of pages4
JournalOptics Letters
Issue number22
Publication statusPublished - 15 Nov 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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