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5 April 1989 Near Specular Scatter Measurement Techniques For Curved Samples
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Abstract
Measurement of near specular scatter requires the specular beam to be tightly focused at the detector plane. The instrument signature is compared to the sample data and the separation point found to determine the minimum measurable scatter angle. Problems arise with this technique when curved samples are measured because the sample changes the beam focus location and requires adjustments to the instrument optics. The result is a focused spot of different diameter. This causes problems when comparing to the instrument signature. This issue, and its correction, are discussed in the paper. Converging samples can be measured closer to specular than flats of similar quality, while diverging samples reduce the ability to measure near specular. Data is presented to illustrate this effect.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kyle A. Klicker, John C. Stover, and Dan J. Wilson "Near Specular Scatter Measurement Techniques For Curved Samples", Proc. SPIE 0967, Stray Light and Contamination in Optical Systems, (5 April 1989); https://doi.org/10.1117/12.948110
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