Search:
Computing and Library Services - delivering an inspiring information environment

3D shape measurement of discontinuous specular objects based on advanced PMD with bi-telecentric lens

Niu, Z, Gao, Nan, Zhang, Zonghua, Gao, Feng and Jiang, Xiang (2018) 3D shape measurement of discontinuous specular objects based on advanced PMD with bi-telecentric lens. Optics Express, 26 (2). pp. 1615-1632. ISSN 1094-4087

[img]
Preview
PDF - Published Version
Available under License Creative Commons Attribution.

Download (5MB) | Preview

Abstract

This paper presents an advanced phase measuring deflectometry (PMD) method based on a novel mathematical model to obtain three dimensional (3D) shape of discontinuous specular object using a bi-telecentric lens. The proposed method uses an LCD screen, a flat beam splitter, a camera with a bi-telecentric lens, and a translating stage. The LCD screen is used to display sinusoidal fringe patterns and can be moved by the stage to two different positions along the normal direction of a reference plane. The camera captures the deformed fringe patterns reflected by the measured specular surface. The splitter realizes the fringe patterns displaying and imaging from the same direction. Using the proposed advanced PMD method, the depth data can be directly calculated from absolute phase, instead of integrating gradient data. In order to calibrate the relative orientation of the LCD screen and the camera, an auxiliary plane mirror is used to reflect the pattern on the LCD screen three times. After the geometric calibration, 3D shape data of the measured specular objects are calculated from the phase differences between the reference plane and the reflected surface. The experimental results show that 3D shape of discontinuous specular object can be effectively and accurately measured from absolute phase data by the proposed advanced PMD method.

Item Type: Article
Subjects: T Technology > T Technology (General)
Schools: School of Computing and Engineering
Depositing User: Harriet Notman
Date Deposited: 24 Jan 2018 09:44
Last Modified: 24 Jan 2018 19:37
URI: http://eprints.hud.ac.uk/id/eprint/34372

Downloads

Downloads per month over past year

Repository Staff Only: item control page

View Item View Item

University of Huddersfield, Queensgate, Huddersfield, HD1 3DH Copyright and Disclaimer All rights reserved ©