Deflectometry Encoding the Measured Angle in a Time-Dependent Intensity Signal.

Pablo Pedreira,Josep Nicolas,Igors Sics,Dominique Heinis, Abel Fontsere,Alejandro Crisol,Juan Campos

Review of Scientific Instruments（2019）SCI 4区

ALBA Synchrotron Light Source | Univ Autonoma Barcelona

Cited 4|Views29

Abstract

We propose a new concept of a deflectometer, aimed to provide high accuracy measurements with high sampling rate and low noise, as required by state-of-the-art slope-measuring profilometers, like Long Trace Profilometers or Nanometer Optics Measuring instruments. For this purpose, we introduce certain modifications to the usual working principle of autocollimators so that the measured angle is not given by the displacement of the pattern captured by a CCD, but by the harmonic contents of the time-modulated intensity signal acquired by a photodiode. By doing this, the signal can be sampled not by just a few thousand pixels but by millions of samples/s.

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