Hi all,
I have just acquired (at the right price) a 3 inch optical flat about 1/2 inch thick.
I remember from university physics laboratory days using a sodium light (I think) to check the flatness of a surface by observing interference fringes.
Is this approach workable for a granite surface plate ?
If it is, what is the work method and suggestions on a source of a suitable monochromatic light source?
So far, all I have tried was a squirt of WD40, the optical flat floats effortlessly across the surface.
Getting into totally unknown territory is fun !
John.
I have just acquired (at the right price) a 3 inch optical flat about 1/2 inch thick.
I remember from university physics laboratory days using a sodium light (I think) to check the flatness of a surface by observing interference fringes.
Is this approach workable for a granite surface plate ?
If it is, what is the work method and suggestions on a source of a suitable monochromatic light source?
So far, all I have tried was a squirt of WD40, the optical flat floats effortlessly across the surface.
Getting into totally unknown territory is fun !
John.
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