Abstract
In precision optical radiometric and photometric measurements, one of the limiting factors is an accurate knowledge of the area of a beam limiting aperture. The world’s most accurate radiometric measurements are currently realized with a relative standard uncertainty of order 10−4. To achieve this level of accuracy it is essential to measure apertures with the same relative standard uncertainty. We present a computer controlled absolute aperture-area measurement system based on a confocal laser beam scanning technique. In this system, a precision aperture is scanned utilizing a tightly focused beam and precision translation stages.
© 2011 AOS
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