Abstract
A compact highly sensitive microfiber coupler based reflective micro-force sensor is presented. The device is fabricated by fusing two twisted optical fibers and then connecting two of the pigtails to form a Sagnac loop. The sensor has a high force sensitivity of ~3754 nm/N which is three orders of magnitude larger than traditional optical fiber force sensors, and a low detection limit of ~1.6 µN. The good repeatability is also shown in this paper.
Highlights
Force sensing is of great importance in many applications such as structure inspection of aircraft, civil infrastructure and earthquake monitoring
Different types of force sensors based on highly birefringent (Hi-Bi) fibers, Mach-Zehnder (M-Z) interferometers, fiber Bragg gratings (FBGs), etc. have been demonstrated
The fabricated device has the advantages of low cost, simple structure, compact size, fabricating as well as high sensitivity (~3754 nm/N) and low detection limit (< 1.6 μN)
Summary
Force sensing is of great importance in many applications such as structure inspection of aircraft, civil infrastructure and earthquake monitoring. In many practical applications, micro-force measurements, the force sensor should be low-cost, compact, structured, fabricated as well as highly sensitive and have a low detection limit. A microfiber FBG based force sensor was demonstrated by Luo et al [11] with a sensitivity of ~3146 nm/N. In reference [15], Ding et al demonstrated a compact thermometer based on a MFC tip for high temperature sensing. A low loss miniature highly sensitive force sensor based on a MFC is presented. The fabricated device has the advantages of low cost (made by commercial single-mode fibers), simple structure (fused optical fiber coupler), compact size (microfiber based device), fabricating (flame-brushing method) as well as high sensitivity (~3754 nm/N) and low detection limit (< 1.6 μN)
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