Pictures
Fourier
N-slit diffraction grating intensity pattern (Ronchi)
Setup of spatial filter (2 double convex lenses and a 50 micron aperture)
Unfiltered light/ Airy pattern through aperture/ Pattern after light exits second lens
Principal maximum of Airy pattern (used iris to get rid of outer rings)/The same beam about 2 meters away, still collimated
N-Slit grating in front of beam/ The image created of the grating using a third lens (simple optics)
I straightened out my setup: everything is parallel
Optimized Airy Disk pattern (50 micron aperture)
Main 4f Setup
Object for high-pass filtering/ Mask for high-pass filtering
Unfiltered image of the object/ Filtered images of the object (high-pass)
Unfiltered image of an edge/ Filtered (edge highlighted) image (high-pass)
Unfiltered image of the crossing of 2 gratings/ Filtered image with one slit in Fourier plane/ Filtered image with a grating in Fourier plane
Orientation filtering-- slit in Fourier plane oriented perpendicular to the pattern to be filtered (in this case the horizontal pattern in the object)
Unfiltered image/Image with iris in Fourier plane half-way closed (low-pass filtering)/ Image with iris blocking almost all of the frequencies higher than the 0th order
Setup and Apparatus for Data Collection
Full setup for low-pass spatial filtering (with CCD camera)/Iris used for low-pass filter/Ronchi used in setup
High-pass filter/ Object used for high-pass filtering
| Lidiya Mishchenko June 2004 |
My
Webpage Laser Teaching Center |