The process for manufacturing a major type of catalytic converter for exhaust pollution control depends upon the availability of a dimensionally precise honeycomb-like ceramic substrate upon which to plate the catalyst metal. Dimensions are important since the cylindrical shaped substrate is later placed within a rigid stainless steel container where close fit is necessary to prevent "blowby". This paper will present a multiple scanning laser technique which was employed to automatically measure diameter in several planes of the still soft ceramic cylinder during the extrusion process.

Date Published: 20 October 1975
PDF: 6 pages
Proc. SPIE 0060, Solving Quality Control and Reliability Problems with Optics, (20 October 1975); doi: 10.1117/12.954394

Published in SPIE Proceedings Vol. 0060:
Solving Quality Control and Reliability Problems with Optics
Juan J. Amodei; Harry N. Lowell, Editor(s)