Acta Optica Sinica, Volume. 39, Issue 4, 0428001(2019)
Sensitivity Improvement of Fabry-Perot Sensor Based on Vernier Effect
A separation type fiber sensor structure is designed to improve sensitivity, in which double Fabry-Perot (F-P) cavities with similar cavity lengths are connected in parallel. The sensitization principle of this structure is theoretically analyzed and two groups of sensitizing structures are prepared. The experimental results show that the pressure sensitivity of the sensitizing structure is increased to 43.95 nm/MPa from 4.85 nm/MPa of the single F-P structure. The temperature sensitivity is increased to 0.40364 nm/℃ from 0.0675 nm/℃ of the single F-P cavity. At the same temperature, the use of double cavity structure can eliminate the effect of temperature cross-sensitivity on measurement results. The structure overcomes the defects of integrated sensitization structure, and increases the sensitivity without affecting the original sensor structure. The sensitivity can be adjusted by replacing the auxiliary cavity. This structure has the advantages of good portability and small cross-sensitivity, etc.
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Yanyan Liu, Lei Liu, Xueqiang Liu, Yantao Wang, Xin Zhang, Mingjun Wang, Yuefeng Qi. Sensitivity Improvement of Fabry-Perot Sensor Based on Vernier Effect[J]. Acta Optica Sinica, 2019, 39(4): 0428001
Category: Remote Sensing and Sensors
Received: Oct. 14, 2018
Accepted: Dec. 12, 2018
Published Online: May. 10, 2019
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