Point Micrometer
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How measure thickness (1mm) of a clear plastic piece accurate to the micron; the measure points are recessed?
The measurement points are recessed, but flat. In other words, super-accurate calipers (if they existed) wouldn't work because they wouldn't be able to touch the recesses on each side of the piece. A micrometer gage may work but it's pushing the limit. There are some optical systems out there, but I'm concerned about the light refraction (index of refraction) resulting in lots of math.
There are other simple thickness measurements based on the material itself.
you could use infra-red absorption. check to see if the plastic has an absorption spectrum. then, using the correct IR wavelength, the thickness is inversly proportional to the transmitted light.
this works for UV measurements as well.
IR Laser metrology is possible.
If this is done on a moving film, the recessed points will produce a digital signal. Thickness and quality limits could be established pretty easily.
CNC Ring Coiler/Continuous Kine-Coiler Four Slide
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