Abstract
We present a simple method for increasing the number of data points
obtained during performance of profilometric measurements with the
Ronchi test. The method is based on multiple ronchigram
acquisitions that are superimposed after a few very simple
data-processing operations. The measurement method, experimental
setup, and data processing are described in detail from the ronchigram
to the measured profile, and experimental results for a concave surface
of an spherical ophthalmic lens are provided. The radius of
curvature values measured for that surface are compared with the ones
obtained with a high-precision radioscope, showing very good agreement
and demonstrating the capability of the technique to measure
topographic profiles of reflective samples.
© 2000 Optical Society of America
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