B-spline adaptive sampling method for freeform surface measurement using laser differential confocal technology
Year: 2024
Type: article
Abstract: A B-spline adaptive sampling (B-SAS) method is proposed for three-dimensional (3D) freeform surface measurements using a laser differential confocal sensor (LDCS). High-precision focusing on optical freeform surfaces was achieved via axial scanning using the LDCS. The B-SAS method, based on the arc length and curvature uniformity, was introduced to enable the adaptive distribution of sampling points on freeform surfaces. Experimental shows that the B-SAS method improves the repeatability accuracy of the peak-to-valley (PV) (3σ) for freeform surfaces by 27% compared with the angular uniform sampling (AUS) method, while the corresponding measurement efficiency is improved by 43%. The repeatability accuracies of the PV (3σ) and root-mean-square (RMS) (3σ) of the measured surfaces, using the B-SAS method, are lower than 29 and 10.3 nm, respectively. This method realises highly accurate and efficient freeform surface measurements and provides a solution for measuring freeform surfaces with large angles or unknown computer-aided design (CAD) models.
Institution: Beijing Institute of Technology
Language: English
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Award: G713865349
OpenAlex ID: W4405311588