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Old Today, 08:45 AM   #4811
simon7000 is offline simon7000  United States
diyAudio Member
Join Date: Nov 2008
Location: Oakmont PA
To make a ruler all you need to do is make an interference pattern. It is not an IC mask which has details. Even if you were using a long wavelength source off say 600 nm (orange) getting the interference pattern at every 600 nm you could place the resulting lines with a position seperation resolution of at least 10 nm.

A line spacing of 2400 nm would still be too small to be useful. The useful limit would be about five times that.

It is actually in the realm of practical to measure distances of less than 10 nm with optical equipment. Completely not the same issues as IC masks.

That method uses a phase locking loop and with even a red light source resolution of 5 nm should not be hard.

Last edited by simon7000; Today at 08:50 AM.
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