Laser Self-Mixing Fiber Bragg Grating Sensor for Acoustic Emission Measurement

Bin Liu; Yuxi Ruan; Yanguang Yu; Jiangtao Xi; Qinghua Guo; Jun Tong; Ginu Rajan

doi:10.3390/s18061956

Laser Self-Mixing Fiber Bragg Grating Sensor for Acoustic Emission Measurement

Sensors (Basel). 2018 Jun 16;18(6):1956. doi: 10.3390/s18061956.

Authors

Bin Liu¹, Yuxi Ruan², Yanguang Yu³, Jiangtao Xi⁴, Qinghua Guo⁵, Jun Tong⁶, Ginu Rajan⁷

Affiliations

¹ School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia. bl987@uowmail.edu.au.
² School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia. yr776@uowmail.edu.au.
³ School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia. yanguang@uow.edu.au.
⁴ School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia. jiangtao@uow.edu.au.
⁵ School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia. qguo@uow.edu.au.
⁶ School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia. jtong@uow.edu.au.
⁷ School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia. ginu@uow.edu.au.

Abstract

Fiber Bragg grating (FBG) is considered a good candidate for acoustic emission (AE) measurement. The sensing and measurement in traditional FBG-based AE systems are based on the variation in laser intensity induced by the Bragg wavelength shift. This paper presents a sensing system by combining self-mixing interference (SMI) in a laser diode and FBG for AE measurement, aiming to form a new compact and cost-effective sensing system. The measurement model of the overall system was derived. The performance of the presented system was investigated from both aspects of theory and experiment. The results show that the proposed system is able to measure AE events with high resolution and over a wide dynamic frequency range.

Keywords: acoustic emission measurement; fiber Bragg grating; laser diode; self-mixing interferometry.