Document Type


Date of Award

Spring 5-31-1989

Degree Name

Doctor of Engineering Science in Mechanical Engineering


Mechanical and Industrial Engineering

First Advisor

Harry Herman

Second Advisor

Bernard Koplik

Third Advisor

E. S. Geskin

Fourth Advisor

James L. Martin


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.



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