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[ATM] mirror testers
Hi List,
Those considering a robo-tester might be interested in the Size 11 Linear Actuator at hsimotors.com. These have resolutions of 0.000125" over a distance of 1.1", according to the webpage. The Size 14 can be micro-stepped for even more resolution if doing the LWT, according to itz page (or else use the Size 11 with a lever). Funny how I didn't see prices mentioned, maybe they're expensive?
http://hsimotors.com/hybrid/size11-hybrid-linear-actuator_external.htm
Hey, does anyone remember this conversation from a while back?
Start with a pinhole at the focal point of a mirror under test. If itz a parabola, all the rays leaving the mirror will be parallel. So run a detector across the aperture on a rail, perpendicular to the optical axis. A pinhole admits a ray of light, which falls somewhere on a ccd chip. You can detect how parallel each beam of light is from each little zone on the mirror, then calculate how good the mirror is. So this should work even with other shapes than parabolas. Cool, eh? Sounds like you are actually measuring the slope, like in the Hartmann test. I forget who was talking about this before. But I have found out that it is not a new idea, it bears USA patent number 1,457,918. Search for it at http://www.uspto.gov
Enjoy,
John
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