Linear FBG Temperature Sensor Interrogation with Fabry-Perot ITU Multi-wavelength Reference

Abstract

The equidistantly spaced multi-passbands of a Fabry-Perot ITU filter are used as an efficient multi-wavelength reference for fiber Bragg grating sensor demodulation. To compensate for the nonlinear wavelength tuning effect in the FBG sensor demodulator, a polynomial fitting algorithm was applied to the temporal peaks of the wavelength-scanned ITU filter. The fitted wavelength values are assigned to the peak locations of the FBG sensor reflections, obtaining constant accuracy, regardless of the wavelength scan range and frequency. A linearity error of about 0.18% against a reference thermocouple thermometer was obtained with the suggested method.

Operation of slope-assisted Brillouin optical correlation-domain reflectometry: comparison of system output with actual frequency shift distribution

“…Due to increasing demand for structural health monitoring of civil infrastructure, a variety of fiber-optic sensors have been extensively studied [1][2][3]. In particular, distributed optical fiber sensors based on Brillouin scattering [4] have been receiving considerable attention due to their measurement capabilities for strain and temperature change.…”

Plantar Pressure Detection with Fiber Bragg Gratings Sensing System

“…It can be used in a variety of harsh environments and under high electric field strength to do environmental monitoring. Several fiber sensor designs based on fiber Bragg gratings (FBGs) for various applications have been reported, such as biomedical measurements [19,27], pressure [28,29,30], displacement [31,32], temperature [33,34,35], tilt [36,37] and ground vibration [38]. In this paper, we propose a fiber-optic sensor based on FBGs to detect plantar pressure.…”

An Improved Negative Pressure Wave Method for Natural Gas Pipeline Leak Location Using FBG Based Strain Sensor and Wavelet Transform

“…Fiber Bragg grating (FBG) sensor offers a number of advantages over traditional sensor, including immunity to electromagnetic interference, being light weight and durable, having small size, incorporating multiplexing capabilities, and is easy to install [8][9][10][11][12][13][14]. Due to the above attractive application features, FBG sensors have been playing an increasingly important role in the sensing community and have been widely used in structural health monitoring, damage detection, aviation, and other fields [15][16][17][18][19][20][21]. However, FBGs have not been extensively adopted in natural gas pipeline leakage location.…”