Microscopic structured light 3D profilometry: Binary defocusing technique vs. sinusoidal fringe projection. (September 2017)

• Record Type: Journal Article
• Authors: Li, Beiwen; Zhang, Song
• Is Part Of: Optics and lasers in engineering. Volume 96(2017)
• Page Start: 117
• Page End: 123
• Publication Date: 2017-09
• Subjects: High-speed -- High-resolution -- Microscopic -- Binary defocusing -- Telecentric lens; Lasers in engineering -- Periodicals; Optical measurements -- Periodicals; Optics -- Periodicals; Lasers en ingénierie -- Périodiques; Mesures optiques -- Périodiques; Optique -- Périodiques; 621.36605
• DOI: 10.1016/j.optlaseng.2016.06.009
• Languages: English
• ISSNs: 0143-8166

Abstract

Abstract: This paper compares the binary defocusing technique with conventional sinusoidal fringe projection under two different 3D microscopic profilometry systems: (1) both camera and projector use telecentric lenses and (2) only camera uses a telecentric lens. Our simulation and experiments found that the binary defocusing technique is superior to the traditional sinusoidal fringe projection method by improving the measurement resolution approximately 19%. Finally, by taking the speed advantage of the binary defocusing technique, we presented a high-speed (500 Hz) and high-resolution (1600×1200) 3D microscopic profilometry system that could reach kHz. Abstract : Highlights: A comparison between binary and sinusoidal patterns under microscopic 3D profilometry. Binary defocusing technique has 19% better depth resolution than sinusoidal method. Binary defocusing could reach kHz 3D sensing under micro-scale.