You need to adjust the Bath so you have few interference lines showing. If you have a perfect sphere then you'll get perfectly straight interference lines. If you have an aspherical surface the lines will have a curvy pattern to them and this were you need to take an image of them and use software to tell what is going one. It looks like your close a sphere but the rings are slightly wider in the middle also the pattern is not perfectly round which indicates some astigmastism. It could be coming from the Bath depending how far apart your reference and return beams are.
Previous
Index
Next
Flat
Re: Foucault tester questions
Edit
Reply
Quote
