Direction-independent fiber inclinometer based on simplified hollow core photonic crystal fiber

Abstract

A fiber optical inclinometer based on modal interferometer is demonstrated for bend angle sensing. The device consists of a piece of simplified hollow core photonic crystal fiber sandwiched between single mode fibers with lateral offset. The measurement of bend angles up to 45° is demonstrated, and the spectrum exhibits a blueshift of over 50 nm. The sensitivity is found to increase with the applied bend angles and reaches 2.4 nm/deg at 45°, and the response is independent of the direction of bending. A low temperature sensitivity of 0.5 pm/°C is observed between room temperature and 1000°C. Due to its capacity for withstanding high temperature, the device can work as a direction-independent inclinometer in high-temperature environments.

Multi-Components Interferometer Based on Partially Filled Dual-Core Photonic Crystal Fiber for Temperature and Strain Sensing

“…Many kinds of sensors based on PCFs have been thoroughly investigated in monitoring various physical parameters including bend [1], strain [2], humidity [3], displacement [4], magnetic field [5], pressure [6], [7], refractive index (RI) [8] and temperature [9], etc. Nowadays, PCFs with selectively filled liquids have been a prominent research focus in the field of fiber optic sensing since the selectively infiltrated PCFs exhibited excellent properties of high spectral sensitivity [10]- [12], optical tunability [13] and flexible operation capability [14], [15].…”

Microfiber Bragg grating for temperature and strain sensing applications

“…These distinctive features have been exploited in a wealth of applications ranging from telecommunication devices to sensors [2,3], and from optical manipulation to high Q resonators. Fiber sensors, based on the various fiber components, have been developed in many forms [4][5][6][7][8][9], and are exhibiting outstanding performances in the field of physical and bio-chemical sensing. Fiber Bragg grating (FBG) is among the most important optical components which has a wide variation of applications [10][11][12][13].…”

Bend and refractive index sensing based on the tuning fork fiber

“…Liu et al [2] proposed a bend sensor based on Er 3+ -doped distributed Bragg reflective fiber laser. A bend sensor based on simplified hollow core photonic crystal fiber was reported by Liu et al [3]. Li et al [4] studied a RI sensor based on the long-period grating (LPG) cascaded to an S fiber taper.…”