Simultaneous Measurement of Curvature, Strain and Temperature Using a Twin-Core Photonic Crystal Fiber-Based Sensor.

Tongtong Zhao,Shuqin Lou,Xin Wang,Yulei Wang,Wan Zhang

doi:10.3390/s18072145

Abstract

A novel twin-core photonic crystal fiber-based sensor for simultaneous measurement of curvature, strain and temperature is proposed. The fiber sensor is constructed by splicing the homemade twin-core photonic crystal fiber between two segments of single mode fiber. Affected by the coupling between two cores, the transmission spectrum of the fiber sensor has different wavelength responses to curvature, strain, and temperature. The maximal sensitivities to curvature, strain and temperature are 10.89 nm/m−1, 1.24 pm/με and 73.9 pm/°C, respectively. Simultaneous measurement of curvature, strain and temperature can be achieved by monitoring the wavelength shifts of selected valleys in the transmission spectrum. Contrast experiment based on traditional twin-core fiber is carried out. Experimental results demonstrate that twin-core photonic crystal fiber-based sensor has higher sensitivity and better linearity than traditional twin-core fiber-based sensor.

Highlights

Optical fiber sensors, which have attracted particular attention in recent decades due to their specific advantages of flexibility, high sensitivity, compact size, low cost, and fast response, have been widely used in many sensing application fields [1,2]
Lots of optical fiber sensors including fiber Bragg gratings (FBGs) [3,4], long-period fiber gratings (LPGs) [5,6], twin-core fiber (TCF) [7,8,9,10], multimode fiber-based Mach-Zehnder interferometer (MZI) [11], tapered fiber-based MZI [12] and the interferometers based on photonic crystal fibers (PCFs) [13,14,15], have been proposed and demonstrated in actual measurement applications
To obtain obtain multi-parameter multi-parameter measurements, measurements, we we propose propose aa twin-core photonic crystal fiber (TC-PCF)-based

Summary

Introduction

Optical fiber sensors, which have attracted particular attention in recent decades due to their specific advantages of flexibility, high sensitivity, compact size, low cost, and fast response, have been widely used in many sensing application fields [1,2]. Fiber optic sensor obtains the measurement of strain, temperature, curvature, refractive index, and other quantities through measuring the change of intensity or wavelength shift. The TCF-based sensor is widely applied in optical fiber sensing due to its remarkable advantages, such as low cost, great flexibility, and stability. Compared with other fiber sensors, TCF-based sensors usually show cross-sensitivity to multi-parameters, such as temperature, pressure, strain, and curvature, which is a drawback for the development of optical fiber sensors [16]. In 2009, Kim et al [17]

Methods

Results

Conclusion