Visualization of additive-type moire and time-average fringe patterns using the continuous wavelet transform

ArticleinApplied Optics 49(19):3640-51 · July 2010with17 Reads
Impact Factor: 1.78 · DOI: 10.1364/AO.49.003640 · Source: PubMed

An application of the continuous wavelet transform to modulation extraction of additive moiré fringes and time-average patterns is proposed. We present numerical studies of the influence of various parameters of the wavelet transformation itself and a fringe pattern under study on the demodulation results. To facilitate the task of demodulating a signal with zero crossing values, a two-frame approach for wavelet ridge extraction is proposed. Experimental studies of vibration mode patterns by time-average interferometry provide excellent verification of numerical findings. They compare very well with the results of our previous investigations using the temporal phase-shifting method widely considered as the most accurate one. No need of performing phase shifting represents significant simplification of the experimental procedure.