Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (8): 1065-1069.DOI: 10.12068/j.issn.1005-3026.2018.08.001

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Fiber Bragg Grating Multi-level Strain Sensor Based on the Structure of Extendable Rod

ZHAO Yong, HE Wen-zheng, TANG Yong-chao   

  1. School of Information Science & Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2017-03-27 Revised:2017-03-27 Online:2018-08-15 Published:2018-09-12
  • Contact: ZHAO Yong
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Abstract: In order to expand the measurement range of optical fiber grating load cell and improve the measurement accuracy of the sensor, a novel multi-level load cell was designed theoretically and simulated by Matlab. Simulation result showed that the single sensor had good linearity when the fluctuation of wavelength is below 0.2nm. In this system, the dual-optical fiber gratings were connected in series with the upper and lower sides of the equal-strength beam. And the output signal of the optical fiber grating was demodulated by the method of light intensity demodulation. By the extendable rod structure, the sensor becomes multi-level sensing, then the measurement range was broadened unchanging its measurement resolution. The feasibility of the proposed sensor was verified by experimental results.

Key words: fiber Bragg grating, load sensor, multi-level sensing, measurement accuracy, light intensity demodulation

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