Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Correcting the Elastic-modulus Error of Quartz Glass Using Digital Speckle-pattern Interferometry

  • Ziyang Song (School of Instrumentation Science and Optoelectronic Engineering, Beijing Information Science and Technology University) ;
  • Weixian Li (School of Instrumentation Science and Optoelectronic Engineering, Beijing Information Science and Technology University) ;
  • Sijin Wu (School of Instrumentation Science and Optoelectronic Engineering, Beijing Information Science and Technology University) ;
  • Lianxiang Yang (Department of Mechanical Engineering, Oakland University)
  • Received : 2023.02.27
  • Accepted : 2023.06.02
  • Published : 2023.08.25
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Abstract

Three-point bending is the main method for measuring the elastic modulus of a thin plate. Although various displacement transducers may be used to measure the bending, these are single-point measurements, and it is difficult to eliminate the error caused by eccentric load and shear force. Error-correction models for the elastic modulus of quartz glass using digital speckle interferometry are proposed for eccentric load and shear force. First, the positional misalignment between maximum deflection and load is analyzed, and the error caused by eccentric load is corrected. Then, the additional displacement caused by shear force at different positions of the quartz glass plate is explored. The effect of shear deformation is also corrected, by measuring two points. Since digital speckle interferometry has the advantage of full-field measurement, it can simultaneously obtain deflection data for multiple points to realize error correction. Experimental results are presented to demonstrate that the proposed model can effectively correct the measurement error of the elastic modulus.

Keywords

Acknowledgement

National Natural Science Foundation of China (NSFC) (No. 52075044, 52075045); Natural Science Foundation of Beijing Municipality (No. 4212047).

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