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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 36 — Dec. 20, 1998
  • pp: 8429–8433

Optical Sensor to Monitor and Control Temperature and Build Height of the Laser Direct-Casting Process

Mahlen D. T. Fox, Duncan P. Hand, Daoning Su, Julian D. C. Jones, Stephen A. Morgan, Mark A. McLean, and William M. Steen  »View Author Affiliations


Applied Optics, Vol. 37, Issue 36, pp. 8429-8433 (1998)
http://dx.doi.org/10.1364/AO.37.008429


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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

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.6780) Instrumentation, measurement, and metrology : Temperature
(140.3390) Lasers and laser optics : Laser materials processing

Citation
Mahlen D. T. Fox, Duncan P. Hand, Daoning Su, Julian D. C. Jones, Stephen A. Morgan, Mark A. McLean, and William M. Steen, "Optical Sensor to Monitor and Control Temperature and Build Height of the Laser Direct-Casting Process," Appl. Opt. 37, 8429-8433 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-36-8429


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References

  1. M. Murphy, C. Lee, and W. M. Steen, “Studies in rapid prototyping by laser surface cladding,” in Laser Materials Processing Conference (ICALEO’93, P. Denney, I. Miyamoto, B. L. Mordike, eds., (Laser Institute of America, Orlando, Fla., 1993), Vol. 77, pp. 882–891.
  2. M. A. McLean, G. J. Shannon, and W. M. Steen, “Laser generating metallic components,” in Eleventh International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, D. R. Hall and H. J. Baker, eds., Proc. SPIE 3092, 753–756 (1996).
  3. F. Meriaudeau and F. Truchetet, “Image processing applied to the laser cladding process,” in High-Power Lasers: Applications and Emerging Applications, M. R. Osborne and G. Sayegh, eds., Proc. SPIE 2789, 93–103 (1996).
  4. F. M. Haran, D. P. Hand, C. Peters, and J. D. C. Jones, “Focus control system for laser welding,” Appl. Opt. 36, 5246–5251 (1997).
  5. J. P. Bentley, Principles of Measurement Systems (Longman Scientific and Technical, London, 1983), p. 342.

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