Automatic ordering of isochromatic fringes ‐ a new methodology

Abstract

Abstract The intensity variations in the isochromatic fringe field are significant and even minute variations can be recorded using the modern day CCD cameras. The sodium vapour source (589. 3 nm) used in general has upto 4% of another wavelength of 589. 6 nm. In view of this, the minimum intensity forming a fringe is affected and is significant at high density fringe zones. This aspect is used to identify sources and sinks in the fringe field and a new methodology for fringe ordering is proposed. It requires only one image to be processed and hence is equally applicable for static and dynamic problems.