Determination of parameters of the lens like the focal length, radius of curvature and refractive index are important from its application point of view. Many interferometric as well as non interferometric methods exist for this. But most of these methods require a visual inspection of the resulting interference pattern. Confocal imaging has very high axial resolution and it permits three-dimensional observation of object. This same property also enables one to determine the axial position of a specularly reflecting object. Here this capability has been applied, in reflection case, to the determination of lens parameters. This method is explained with simulation using diffraction theory and experimental results.

Date Published: 17 June 2009
PDF: 8 pages
Proc. SPIE 7389, Optical Measurement Systems for Industrial Inspection VI, 738911 (17 June 2009); doi: 10.1117/12.827470

Published in SPIE Proceedings Vol. 7389:
Optical Measurement Systems for Industrial Inspection VI
Peter H. Lehmann, Editor(s)