Particle temperature measurement in the thermal spray process

Particle temperature is a fundamental parameter in the thermal spray proces s. The measurement of particle temperature usually relies on the measuremen t of the radiance of the hot, incandescent, particles in two or more wavele ngth or color bands. Measurement techniques can be categorized as single pa rticle and ensemble methods. Single particle methods use high-speed pyromet ry to estimate the temperature of individual particles. The mean and standa rd deviation of the particle temperature distribution can then be obtained from observations of sufficient numbers of individual particles. Ensemble m ethods observe Large numbers of particles simultaneously and yield an estim ated mean temperature directly, but cannot provide information on the shape or width of the particle temperature distribution. Both techniques have in herent errors, strengths, and limitations that are examined and discussed.