A Fiber-Coupled Self-Mixing Laser Diode for the Measurement of Young's Modulus

Ke Lin; Yanguang Yu; Jiangtao Xi; Huijun Li; Qinghua Guo; Jun Tong; Lihong Su

doi:10.3390/s16060928

A Fiber-Coupled Self-Mixing Laser Diode for the Measurement of Young's Modulus

Sensors (Basel). 2016 Jun 22;16(6):928. doi: 10.3390/s16060928.

Authors

Ke Lin¹, Yanguang Yu², Jiangtao Xi³, Huijun Li⁴, Qinghua Guo⁵, Jun Tong⁶, Lihong Su⁷

Affiliations

¹ School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia. kl740@uowmail.edu.au.
² School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia. yanguang@uow.edu.au.
³ School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia. jiangtao@uow.edu.au.
⁴ School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong NSW 2522, Australia. huijun@uow.edu.au.
⁵ School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia. qguo@uow.edu.au.
⁶ School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia. jtong@uow.edu.au.
⁷ School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong NSW 2522, Australia. lihongsu@uow.edu.au.

Abstract

This paper presents the design of a fiber-coupled self-mixing laser diode (SMLD) for non-contact and non-destructive measurement of Young's modulus. By the presented measuring system, the Young's modulus of aluminum 6061 and brass are measured as 70.0 GPa and 116.7 GPa, respectively, showing a good agreement within the standards in the literature and yielding a much smaller deviation and a higher repeatability compared with traditional tensile testing. Its fiber-coupled characteristics make the system quite easy to be installed in many application cases.

Keywords: Young’s modulus; fiber-coupled; fundamental resonant frequency; self-mixing interferometry; self-mixing laser diode.