Patent ID: 7307706
Filing Date: 2007-12-11
Classification: G01J,G01M

Abstract:
1. A method of estimating one or more optical characteristics of a Device-Under-Test (DUT), including the steps of: directing an optical wavefront, generated by a source, towards a test location; generating at least one ray from the wavefront at the test location; for each ray: for each measurement plane estimating from the determined transverse aberrations the coefficients of a general transverse aberration equation, the coefficients of which are the product of a combination of optical characteristics and the optical distance between the measurement plane and the appropriate principal plane of the DUT; calculating the one or more optical characteristics from the estimates of the coefficients for each measurement plane and the optical distances between respective measurement planes; and one of the steps selected from the group consisting of: plotting the calculated optical characteristics as a map, aligning the DUT and an incident optical wavefront, and adjusting one of the optical characteristics of the DUT.