Take a sneak peek at the new NIST.gov and let us know what you think!
(Please note: some content may not be complete on the beta site.).
NIST Authors in Bold
|Author(s):||J B. Fowler; Maritoni A. Litorja;|
|Title:||Geometric Area Measurements of Circular Apertures for Radiometry at NIST|
|Published:||February 01, 2003|
|Abstract:||NIST has established a geometric aperture-area measurement facility for circular apertures. The instrument consists of an interferometrically controlled XY translation stage for high-accuracy positioning and a video microscope for detection fo the aperture edge. Least-squares fitting of the edge points located along the aperture's inner circumference to the equation of a circle is used to determine the geometric area. In this paper we describe the measurement method, based on the work started and described by Fowler, Durvasula and Parr . Analysis and estimation of various contributions to the overall measurement uncertainty, including the effects of diffraction and partial coherence of light on the edge location are also discussed.|
|PDF version:||Click here to retrieve PDF version of paper (72KB)|