Abstract
Based on the principle of intensity interrogation, the sensitivity of the fiber Bragg grating Fabry-Perot interferometer (FBG-FPI) strain sensor is analyzed and the influences of the grating length, the effective refractive index change and the cavity length of FBG-FPI resonator on the maximum strain sensitivity are also discussed. The strain sensitivities of two structures which FBG-FPI fibers are affixed to the transducer by different ways are also considered. The comparison between FBG-FPI and single fiber Bragg grating as well as traditional fiber Fabry-Perot interferometer with intensity interrogation is also presented. It is shown that the minimum theoretically detectable strain of the FBG-FPI strain sensors with intensity interrogation should be on the order of 10-12. The corresponding experiments, in which a periodic strain stimulated by a piezoelectric (PZT) affixed to the FBG-FPI, show that such a FBG-FPI strain sensor can be used to detect weak alternating strain signal and it has good linear character after the non-linear correction.
Original language | English |
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Pages (from-to) | 1525-1531 |
Number of pages | 7 |
Journal | Zhongguo Jiguang/Chinese Journal of Lasers |
Volume | 37 |
Issue number | 6 |
DOIs | |
State | Published - Jun 2010 |
Keywords
- Fabry-Pérot interferometer
- Fiber Bragg grating
- Fiber sensor
- Sensors
- Strain sensitivity