Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (12): 1688-1691.DOI: 10.12068/j.issn.1005-3026.2016.12.004

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Optic-Fiber Sagnac Strain Sensor Based on Alcohol Selectively-Filling Photonic Crystal Fiber

HU Hai-feng, LI Xue-gang, ZHOU Xue, ZHAO Yong   

  1. School of Information Science & Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2016-05-24 Revised:2016-05-24 Online:2016-12-15 Published:2016-12-23
  • Contact: ZHAO Yong
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Abstract: A new optic-fiber Sagnac strain sensor based on alcohol filling photonic crystal fiber was proposed and demonstrated, by which measuring the minute strain could be achieved. The birefringence of the photonic crystal fiber (PCF) was produced by alcohol selectively-filling the air holes of the PCF. And then the alcohol selectively-filling photonic crystal fiber was embedded in the Sagnac loop and the Sagnac interference effect was achieved. Then the peak wavelength of the Sagnac interference spectrum could be changed by strain because the peak wavelength shift was directly proportion to strain change. The micro strain sensitivity is measured to be 3.66pm in a micro strain range from 0 to 3958.

Key words: photonic crystal fiber; Sagnac strain sensor, strain; alcohol selectively-filling; sensor

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