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Foucault / Couder-mask reduction for telescope mirrors

Mirror

Zones & knife-edge readings

#InnerOuterEff. radius ReadingIdealSurf err (nm)

Enter zone boundaries (inner/outer) or just the effective radius. Reading = averaged knife-edge position per zone, in the chosen units.

Results

Wavefront error across the aperture

Offset from best‑fit ROC 0.0000

Millies-Lacroix Analysis

Percentage of desired correction (each zone vs. the one inside it)
M-L tornado — zonal aberration vs. the resolution-disk tolerance tube

Drop a .fig file

Load a sample mirror

Couder mask designer

Equal-area annular zones with paired radial slots, sized to your mirror. Download a 1:1 PostScript file to print and cut.

#InnerOuterEff. radius