Optical sensor to monitor and control temperature and build height of the laser direct-casting process

M. D T Fox, Duncan P. Hand, Daoning Su, J. D C Jones, Stephen A. Morgan, Mark A. McLean, William M. Steen

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A nonintrusive optical sensor system is applied to real-time process control of the recently developed laser direct-casting process, in which a stream of metal powder is introduced into the beam of a high-power (500-W) cw laser to fabricate complex three-dimensional structures. The sensor system allows two critical parameters, temperature and build height, associated with this process to be monitored and controlled continuously. We achieved a height-sensing resolution of ±0.25 mm and temperature control with a resolution of ±10°C at a typical working temperature of 1500°C with an evident improvement in process quality, especially for complex workpieces comprising relatively high, thin walls at which the conductive heat transfer varies substantially as the process proceeds. © 1998 Optical Society of America.

Original languageEnglish
Pages (from-to)8429-8433
Number of pages5
JournalApplied Optics
Volume37
Issue number36
DOIs
Publication statusPublished - 1998

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