The Lumenarium: The official blog of Lumetrics, Inc.

Materials Cross-Section Using a Low-Coherence Interferometer

Posted July 18, 2017 by Kristin
Abstract — Optical thickness metrology techniques rely on illuminating the sample of interest with light and analyzing the reflections. These techniques work best on objects with smooth surfaces: glass lenses, windows, plastic webs, etc. However, measurement capabilities of such instruments deteriorate in situations where the reflected light is affected by imperfect surfaces, due to optical scattering or absorption. This application note describes a method of obtaining thickness information for such imperfect samples using its optical cross-sectional view acquired in a non-destructive way. The method employs the commercially available instrument, OptiGauge II, which is based on time-domain low-coherence interferometry.
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Tags: Non contact thickness measurement, optical thickness measurement, optical metrology