Differential Shack-Hartmann curvature sensor: local principal curvature measurements

摘要: The concept of a differential Shack-Hartmann (DSH) curvature sensor was recently proposed, which yields wavefront curvatures by measuring slope differentials. As an important feature the DSH sensor, twist terms can be efficiently obtained from measurements, thus providing means to measure Monge-equivalent patch. Specifically, principal and directions, four key parameters in geometry, computed Laplacian terms. directions provide “complete” definition local shape. Given adequate sampling, these measurements useful quantifying mid-spatial-frequency errors, yielding complete characterization surface being measured.