3D reconstruction CMP GD&amp History of engineering & technology Monte Carlo method T Technology: general issues a priori planning absolute angle measurement absolute distance measurement actual laser imaging waveform aeroengine blade angle measurement automated optical inspection blade tip timing blade twist centroid difference chromatic confocal probe circular contour circulating cooling water circumferential Fourier fit compressed sensing confocal sensing confocal sensor coordinate measuring machine cutting edge radius defect detection depth detection diamond roller differential Fabry-Pérot interferometer