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Radial Shear Interferometer
Excerpt from Field Guide to Interferometric Optical Testing
A radial shear interferometer introduces radially symmetric shear by interfering the wavefront with an expanded copy of itself. A large shear gives similar results to a Twyman-Green interferometer, while small shear is a low sensitivity, high-dynamic-range test.
The resulting interferogram is the same as a Twyman-Green if each aberration coefficient is divided by 
, where n is the radial power of each particular aberration.
Citation:
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E. P. Goodwin and J. C. Wyant, Field Guide to Interferometric Optical Testing, SPIE Press, Bellingham, WA (2006).
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