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A Fiber-Coupled Self-Mixing Laser Diode for the Measurement of Young's Modulus
Ke Lin1, Yanguang Yu2, Jiangtao Xi3
1School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Ave, Wollongong NSW 2522, Australia. kl740@uowmail.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.
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