To obtain good interference fringes, for the control of optical surfaces, through the so-called "test plate", It is necessary to have a 'apparatus allowing to uniformly illuminate, with a monochromatic light, the two glasses under test and redirect the resulting image at the device or towards the observer. The device itself is
Support for the mirror, necessary for the proper positioning of the same during another test is not that any device able to keep it in a safe and in a vertical position. The support can be seen as the assembly of 5 distinct elements: Panel or carrier rear structure lower supports for the support of the
A Foucault Tester, with fixed light source fixing to be carried out with devices which commonly have at home (webcam and a pen / USB stick ) screwdriver , hacksaw and simple components purchased from Brico with little expense. below of the components you found the exploded, assembly instructions, list of materials and some support attachments.
Ronchi pattern
One of the tools needed to run the Ronchi test is the namesake grating. This is a series of opaque parallel lines spaced equally so you have a spatial frequency that can go from 4 all 8 per millimeter. A pattern with a lower frequency can be used if it is necessary to test
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