Model 2GRP Grazing Incidence Interferometer

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The Model 2GRP LAZER GRAZER is a non-contacting Grazing Incidence Interferometer. . . the first modestly priced Interferometer for measuring flatness of semi-matte or matte-finished surfaces.
Principle of Operation
When a rough surface is examined at a low grazing angle, it appears to be highly reflective
The LAZER GRAZER utilizes this principle to produce high contrast interferograms of unpolished surfaces. A grazing angle of 14.48 degrees was selected since at that angle, each interference fringe equals one wavelength. With a normal incidence Fizeau Interferometer, each fringe equals one half wavelength

Article from GRAHAM OPTICAL SYSTEMS,

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