About Engineering Metrology Toolbox

The NIST goal is to provide world-class engineering metrology resources to the U.S. manufacturers. This web site is one of an array of mechanisms they make available to our customers to help them achieve high-accuracy dimensional measurements traceable to national and international standards. Their goal is to assist you with improving your measurement capabilities.

Currently the web site has two computational tools. The first tool is for calculating the index of refraction of air, which is needed for interferometric length measurements. The second tool is for calculating the elastic compression of spheres and cylinders at point and line contact, which can enable the user, for example, to correct for elastic deformations when measuring a part with a contacting probe. The calculations are implemented for 16 different contact geometries.

http://emtoolbox.nist.gov/Main/Main.asp