title: Highly sensitive curvature sensor based on a multicladding fiber sandwiched dual no-core fibers structure.
abstract: In this paper, we present a simple, compact, and highly sensitive optical fiber curvature sensor. It consists of dual no-core fibers for coupling energy from the lead-in single-mode fiber (SMF), and recoupling the energy into the lead-out SMF. The sensing section is constituted by multicladding fiber with a length of 5 cm. In the experiment, the spectrum shows a blueshift, and the energy corresponding to the resonant wavelength shows a cosine series with a bending of the sensing segment. The curvature sensitivity around the wavelength of 1550 nm shows -39.02 nm/m(-1) within the curvature range from 0.3 to 2.14 m(-1). The temperature sensitivity is 78.2 pm/°C in the temperature range of 10 °C-60 °C. It implies the possibility of temperature measurement.
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Qi
authors.forename: Lin
authors.initials: L
authors.lastname: Ma
authors.forename: Zexin
authors.initials: Z
authors.lastname: Kang
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Bai
authors.forename: Bin
authors.initials: B
authors.lastname: Yin
authors.forename: Shuisheng
authors.initials: S
authors.lastname: Jian
mesh_terms: D055119:Elastic Modulus; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007368:Interferometry / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D013696:Temperature; D013817:Thermography / Q000295:instrumentation*; D014159:Transducers