Temperature-insensitive optical tilt sensor based on a single eccentric-core fiber Bragg grating

Abstract

This paper presents a novel and simple temperatureinsensitive optical tilt sensor based on a single eccentriccore fiber Bragg grating (ECFBG). By partly inserting an ECFBG into a ceramic ferrule, the reflection spectrum of the ECFBG splits into two peaks as a result of the applied tilt angle. The magnitude and direction of inclination in one-dimension can be determined by monitoring the wavelength separation between both peaks, which is inherently insensitive to temperature. The proposed tilt sensor has a good linear response within a wide dynamic range of ±45°, with a sensitivity of 0.012 nm/°, resolution of 0.83° and accuracy of 0.41°. Being free from any inherent mechanical joint/ friction, along with the advantages of a compact structure, good repeatability and low cost, the proposed sensor is highly suitable for practical engineering applications.

Recent Advancement of Anti-Resonant Hollow-Core Fibers for Sensing Applications

“…Similar to the Bragg wavelength for fiber Bragg grating (FBG) [46][47][48] and loss peak for long period grating (LPG) [49,50], the resonant wavelength is a remarkable characterization for AR-HCFs. Accordingly, AR-HCFs can be also regarded as one of the functional fiber sensing devices.…”

Liquid‐Based Digital Readable Tilt Sensor

“…A temperature‐independent tilt sensor using a solid material was reported previously. [ 30 ] The sensor had a measurement error of ≈0.4° in the temperature range of 27–65 °C and a high resolution of 0.83°. However, the observation system was very complicated because an optical system was used for measurement and the 2D inclination direction could not be detected.…”

Effects of bonding on the performance of optical fiber strain sensors

“…However, in recent years, there has been an impressive development of optical fiber sensors (OFSs) by reason of their advantages over traditional sensors, such as immunity to electromagnetic interference, flexibility, lightweight, high sensitivity and accuracy, intrinsic safety, multiplexing capabilities, resistance to radiation and corrosion, 17–19 and high‐speed data acquisition 20 . These innovative sensors have been applied to sense a number of different measurands, such as strain, 21 stress, 22 temperature, 23,24 moisture, vibration, slope, 25 chemicals, 26 and even curvature 27–30 and shape 31–35 . Nevertheless, strain and temperature sensors are the most widely employed technologies for SHM applications 36,37 …”