• Trusiak, Maciej
• Patorski, Krzysztof

Abstract

Optical whole-field measurement methods with simultaneous acquisition and parallel processing of experimental data are well suited to evaluate mechanical properties of macro and microscale objects in static and dynamic regimes. They enable non-invasive, contact- less, fast, automatic and very accurate investigations of, e.g., in-plane displacements/strain fields, vibration testing and 3D shape evaluation. The measurand is encoded in the output fringe pattern phase (fringe period and orientation) or amplitude distribution (fringe contrast). Quantitative analysis is performed using computer-aided automatic fringe pattern analysis (AFPA) methods [1,2]. The accuracy and calculation speed of the most attractive, from the experimental point of view, single shot techniques depend mainly on the algorithmic solutions applied. In this contribution we advocate several novel algorithms developed by us for efficient fringe filtering and phase/amplitude demodulation based on the notion of the Hilbert-Huang transform (HHT). Their robustness and effectiveness is exemplified by processing fringe patterns obtained using two powerful experimental mechanics techniques, i.e., time-average interferometry and 2D grating (moiré) interferometry.

Topics

• impedance spectroscopy
• phase
• laser emission spectroscopy
• quantitative determination method
• interferometry