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Proceedings Paper

A Computer-Controlled Laser Bore Scanner
Author(s): Charles C.K. Cheng
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Paper Abstract

This paper describes the design and engineering of a laser scanning system for production applications. The laser scanning techniques, the timing control, the logic design of the pattern recognition subsystem, the digital computer servo control for the loading and un-loading of parts, and the laser probe rotation and its synchronization will be discussed. The laser inspection machine is designed to automatically inspect the surface of precision-bored holes, such as those in automobile master cylinders, without contacting the machined surface. Although the controls are relatively sophisticated, operation of the laser inspection machine is simple. A laser light beam from a commercially available gas laser, directed through a probe, scans the entire surface of the bore. Reflected light, picked up through optics by photoelectric sensors, generates signals that are fed to a mini-computer for processing. A pattern recognition techniques program in the computer determines acceptance or rejection of the part being inspected. The system's acceptance specifications are adjustable and are set to the user's established tolerances. However, the computer-controlled laser system is capable of defining from 10 to 75 rms surface finish, and voids or flaws from 0.0005 to 0.020 inch. Following the successful demonstration with an engineering prototype, the described laser machine has proved its capability to consistently ensure high-quality master brake cylinders. It thus provides a safety improvement for the automotive braking system. Flawless, smooth cylinder bores eliminate premature wearing of the rubber seals, resulting in a longer-lasting master brake cylinder and a safer and more reliable automobile. The results obtained from use of this system, which has been in operation about a year for replacement of a tedious, manual operation on one of the high-volume lines at the Bendix Hydraulics Division, have been very satisfactory.

Paper Details

Date Published: 8 August 1980
PDF: 5 pages
Proc. SPIE 0230, Minicomputers and Microprocessors in Optical Systems, (8 August 1980); doi: 10.1117/12.958813
Show Author Affiliations
Charles C.K. Cheng, Bendix Corporation (United States)

Published in SPIE Proceedings Vol. 0230:
Minicomputers and Microprocessors in Optical Systems
Chris L. Koliopoulos; Frederic M. Zweibaum, Editor(s)

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