| Effect of Spectral Emission on Two Color Pyrometry Techniques Commonly used for Thermal Spray Diagnostics | ||
| Mr. Andrew J. Mayer1, Dr. Aaron C. Hall2, Dr. Richard A. Neiser2, Dr. Diedre A. Hirschfeld3, Mr. David A. Urrea2, David E. Beatty1, John W. Cates2 and Mr. Timothy J. Roemer1, 1Ketch Corporation, 1300 Eubank Blvd. S.E., Albuquerque, NM 87123-3336, 2Joining and Coating Department, Sandia National Laboratories, P.O. Box 5800, MS 1130, Albuquerque, NM 87123-1130, 3Materials and Metallurgical Engineering, New Mexico Institue of Mining and Technology, 801 Leroy Place, Socorro, NM 87801
Two-color pyrometry has become very common in the measurement of thermal spray particle temperature. Two-color pyrometry can be confounded by the presence of vapor peaks in the infrared emission spectrum. Inexpensive, hand-held devices are now available that make it very practical to investigate the spectrum of a material during the spray process. Common materials such as alumina have been found to emit vapor peaks at wavelengths that are commonly used for two-color pyrometry. The presence of vapor emission can lead to erroneous temperature measurement, and some sensors may even exhibit reversed temperature trends under these conditions. This paper details some of the spectral information that has been collected and the filtering techniques that were used to improve the measurement quality. | ||