Two-colour pyrometer for the statistical measurement of the surface temperature of particles under thermal plasma conditions
J Mishin; M Vardelle; J Lesinski; P Fauchais; J Mishin; Equipe Thermodynamique & Plasma, Limoges Univ., France; M Vardelle; Equipe Thermodynamique & Plasma, Limoges Univ., France; J Lesinski; Equipe Thermodynamique & Plasma, Limoges Univ., France; P Fauchais; Equipe Thermodynamique & Plasma, Limoges Univ., France
Журнал:
Journal of Physics E: Scientific Instruments
Дата:
1987-06-01
Аннотация:
A two-colour pyrometer was developed for the measurement of the surface temperature of particles in flight in a DC plasma-spraying jet which is characterised by high temperatures (up to 10000 K), high velocities (more than 500 ms<sup>-1</sup>) and very steep radial temperature gradients (3000 K mm<sup>-1</sup>) and velocity gradients (300 m s<sup>-1</sup> mm<sup>-1</sup>). Measurements of surface temperature have been made on metallic (Ni) or ceramic powders (ZrO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>) with mean diameter of 10-100 mu m. The surface temperatures of the particles range from 2000-4000 K and their velocities (measured simultaneously by laser anemometry) are from 50-300 m s<sup>-1</sup>. One of the major difficulties of pyrometry in such flows is the plasma radiation, especially in the jet core.
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