Fringe-pattern analysis using a spatial phase-stepping method with automatic phase unwrapping

Autor:	Steve Carl Jamieson Parker, P H Chan, P J Bryanston-Cross
Rok vydání:	1995
Předmět:	Flow visualization Field (physics) Applied Mathematics Phase (waves) Image processing Minimum spanning tree Holographic interferometry symbols.namesake Fourier transform symbols Instrumentation Engineering (miscellaneous) Algorithm Transonic Mathematics
Zdroj:	Measurement Science and Technology. 6:1250-1259
ISSN:	1361-6501 0957-0233
DOI:	10.1088/0957-0233/6/9/004
Popis:	Presents a new method of fringe-pattern analysis by spatial phase stepping (SPS). The SPS method combines the computational simplicity of phase stepping with the single-image analysis capability of the Fourier transform method. The technique works by subdividing a linearized fringe pattern into three component images, from which the phase is calculated by a three-phase step algorithm. A computer simulation has been undertaken to demonstrate the theory and to enable an analysis of systematic errors. In addition, an experimental transonic flow field is solved by SPS and a comparison is made with results derived using the Fourier transform method. The experiment also demonstrates the use of the minimum spanning tree phase-unwrapping strategy to create a continuous map of the whole transonic flow field.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3bca8021e78d8b114c810f99bcbc260e https://doi.org/10.1088/0957-0233/6/9/004 Zobrazit plný text záznamu