The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Close-range, noncontact distance measurement by controlled image irradiance
Author:	Kim, Jaeho
View Online:	njit-etd1989-036 (vii, 141 pages ~ 4.0 MB pdf)
Department:	Department of Mechanical and Industrial Engineering
Degree:	Doctor of Engineering Science
Program:	Mechanical Engineering
Document Type:	Dissertation
Advisory Committee:	Herman, Harry (Committee chair) Koplik, Bernard (Committee member) Geskin, E. S. (Committee member) Martin, James L. (Committee member)
Date:	1989
Keywords:	Optics. Lasers--Industrial applications.
Availability:	Unrestricted
Abstract:	Dimensional measurement or check is a major part of the inspection and quality control in manufacturing. Most of the measurement applications are based on contact methods. While a number of non-contact methods are available, they are limited in accuracy, in flexibility, or in the range of application areas. An optical, close-range, non-contact distance measurement method has been developed for manufacturing and other applications. Based on a simple imaging principle, the method derives the distance information from the power response of a small axial image area, the irradiance of which is controlled by an active controlled illumination of the corresponding object area. The proposed method uses a low power laser beam for the illumination and can be used on both diffusive and reflective surfaces. The proposed sysem configuration and development is discussed with the requirements of the application environments. Based on the proposed system, the controlled illumination using a laser beam and the theoretical responses from diffusive and reflective surfaces are analyzed. The results are compared with the empirical data obtained from an experimental system.