white-light scanner (WLS)

A device for measuring the physical geometrical characteristics of an object using whitelight interferometry. WLS systems capture intensity data at a series of positions along the vertical axis, determining where the surface is located by using the shape of the white-light interferogram, the localized phase of the interferogram, or a combination of both shape and phase. The whitelight interferogram consists of the superposition of fringes generated by multiple wavelengths, obtaining peak fringe contrast as a function of scan position; the red portion of the object beam interferes with the red portion of the reference beam; the blue interferes with the blue, and so forth. A prodigious amount of data is available in a white-light interferogram.

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