black and white grid filter

Double contrast Grid Filter.

Principle:

- The Fourier filtering allows modifying certain unwanted frequencies of an object by inserting a mask adapted in the Fourier plane (or focal plane of the initial image).

- Thus, the image (or the different spatial frequencies which constitute it), is interpreted as a diffraction pattern.

These measurements thus require a collimated light source, but mostly purified: this is why the Ovio Laser Torch (ref. 204 080), ready to use and pre-set, is perfect for this type of techniques.

Results:

Influence of the slit opening (reading on the micrometers screw) on the jamming of spaced gratings of different frequencies