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Table 1 Parameters of the round robin specimens

From: Round robin comparison study on the form measurement of optical freeform surfaces

PropertyTwo-radiiConvex toroidConcave toroid
MaterialSuper Invar ®Super Invar ®Super Invar ®
Diameter40 mm50 mm100 mm
Markersnone4 Gaussian peaks; different depthsnone
Radius of curvaturer1=39.5 mmrv=40 mmrv=400 mm
 r2=40 mmrh=42 mmrh=450 mm
Designed byPTBPTBPTB
ManufacturerIPPIPPIPP