Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 295, Issue -, Pages 31-36Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2019.05.024
Keywords
Long-Period grating; Multimode fiber; Bending sensor; Miniature sensor
Funding
- National Nature Science Foundation of China [11704086, 11603008, U1831115, U1631239]
- Chinese Academy of Sciences (CAS) [U1831115, U1631239]
- Aeronautical Science Foundation of China [201608P6003]
- Fundamental Research Funds for Harbin Engineering University of China
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A miniature bending sensor is designed using multimode fiber (MMF) and single mode fiber (SMF). Two kinds of optical fibers are periodically spliced and arranged. MMF provides a strong refractive index modulation with a short length, and a significant resonance peak forms in only 5 periods. The final length of the sensor is only 3 mm. The evolution process and spectrum characteristics of the SMS-LPG are demonstrated through a simulation and experiment. The bending sensitivity is 31.47 nm/m(-1) with a bending range of 0-2.44 m(-1). The experiment results reveal that the proposed sensor has an insensitive temperature response (0.0106 nm/degrees C). (C) 2019 Elsevier B.V. All rights reserved.
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