Add to BibSonomy
Abstract
A compact and low-cost two-dimensional (2D) thermal imager was developed for real-time temperature mapping of a melt pool during coaxial laser cladding (the additive manufacturing technique). The device combines a color CMOS camera and a compact spectrometer. The spectrometer was utilized for internal calibration and validation of a 2D temperature map that was acquired by the CMOS camera. The remarkable feature of the thermal imager is that camera images are calibrated directly during the measurement process utilizing spectral pyrometry. Additionally, the spectrometer decreased a potential systematic error due to a spectrum contribution from atomic/ionic lines emission. The spectral pyrometry provided temperature accuracy measurements of $\pm {23}\;{\rm K}$ while two-dimensional (2D) temperature mapping by two-color pyrometry accuracy was estimated as $\pm {38}\;{\rm K}$ in the range of 1700–3500 K. The system has been installed at a coaxial laser cladding head for real-time temperature mapping. The system was developed for measuring a melt pool during laser cladding production of a high wear-resistant coating (tungsten carbide particles in a nickel matrix). Tungsten carbides powder flow rate has been changed sequentially from 5 to 27 g/min by powder feeder programming, which resulted in a variation of melt pool dimensions and temperature maps during the cladding process.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Vasily N. Lednev, Pavel A. Sdvizhenskii, Roman D. Asyutin, Roman S. Tretyakov, Mikhail Ya. Grishin, Anton Ya. Stavertiy, Alexander N. Fedorov, and Sergey M. Pershin
Opt. Express 27(4) 4612-4628 (2019)
Connor Woodruff, Steven W. Dean, and Michelle L. Pantoya
Appl. Opt. 60(16) 4976-4985 (2021)
John M. Densmore, Matthew M. Biss, Kevin L. McNesby, and Barrie E. Homan
Appl. Opt. 50(17) 2659-2665 (2011)