Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Optical-fiber Electronic Speckle Pattern Interferometry for Quantitative Measurement of Defects on Aluminum Liners in Composite Pressure Vessels

  • Kim, Seong Jong (Department of Mechanical Engineering, Chonbuk National University) ;
  • Kang, Young June (Department of Mechanical Engineering, Chonbuk National University) ;
  • Choi, Nak-Jung (Department of Mechanical Engineering, Chonbuk National University)
  • Received : 2012.10.19
  • Accepted : 2012.12.28
  • Published : 2013.02.25
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Abstract

Optical-fiber electronic speckle pattern interferometry (ESPI) is a non-contact, non-destructive examination technique with the advantages of rapid measurement, high accuracy, and full-field measurement. The optical-fiber ESPI system used in this study was compact and portable with the advantages of easy set-up and signal acquisition. By suitably configuring the optical-fiber ESPI system, producing an image signal in a charge-coupled device camera, and periodically modulating beam phases, we obtained phase information from the speckle pattern using a four-step phase shifting algorithm. Moreover, we compared the actual defect size with that of interference fringes which appeared on a screen after calculating the pixel value according to the distance between the object and the CCD camera. Conventional methods of measuring defects are time-consuming and resource-intensive because the estimated values are relative. However, our simple method could quantitatively estimate the defect length by carrying out numerical analysis for obtaining values on the X-axis in a line profile. The results showed reliable values for average error rates and a decrease in the error rate with increasing defect length or pressure.

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References

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