Transient deformation measurement using dual-pulse addition ESPI

David I. Farrant; Guillermo H. Kaufmann; Jon N. Petzing; John Raymond Tyrer; Bozenko F. Oreb; David Kerr

doi:10.1117/12.294507

12 December 1997 Transient deformation measurement using dual-pulse addition ESPI

David I. Farrant, Guillermo H. Kaufmann, Jon N. Petzing, John Raymond Tyrer, Bozenko F. Oreb, David Kerr

Proceedings Volume 3173, Ultrahigh- and High-Speed Photography and Image-based Motion Measurement; (1997) https://doi.org/10.1117/12.294507
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

An electronic speckle pattern interferometry system based on a frequency-doubled twin Nd:YAG laser emitting dual pulses at a TV camera field rate (50 Hz) was developed to analyze addition fringes generated by transient deformation of a test object. The main advance has been the automatic, quantitative analysis of dual-pulsed addition ESPI data by the introduction of carrier fringes and the application of Fourier methods. The carrier fringes are introduced between dual pulses by tilting the reference beam with a mirror driven by a galvanometer. The resulting deformation-modulated addition fringes are enhanced with a variance filter before evaluation of the phase distribution using a Fourier transform method with bandpass filtering. From the wrapped phase distribution, a continuous phase map is reconstructed using an iterative weighted least- squares unwrapper. The linear phase distribution associated with the carrier fringes is removed by evaluating it with a least-squares fitting algorithm. Preliminary results obtained for a thin plate submitted to an acoustic shock show the suitability of the system for the quantitative evaluation of transient deformation fields.

Citation Download Citation

David I. Farrant, Guillermo H. Kaufmann, Jon N. Petzing, John Raymond Tyrer, Bozenko F. Oreb, and David Kerr "Transient deformation measurement using dual-pulse addition ESPI", Proc. SPIE 3173, Ultrahigh- and High-Speed Photography and Image-based Motion Measurement, (12 December 1997); https://doi.org/10.1117/12.294507

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