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Effect of spray particle trajectory on the measurement signal of particle parameters based on thermal radiation

LI, Chang-Jiu ; TAO WU ; LI, Cheng-Xin ; BO SUN

Journal of thermal spray technology, 2003-03, Vol.12 (1), p.80-94 [Periódico revisado por pares]

Heidelberg: Springer

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  • Título:
    Effect of spray particle trajectory on the measurement signal of particle parameters based on thermal radiation
  • Autor: LI, Chang-Jiu ; TAO WU ; LI, Cheng-Xin ; BO SUN
  • Assuntos: Cross-disciplinary physics: materials science; rheology ; Exact sciences and technology ; Filtering ; Filtration ; Materials science ; Mathematical models ; Methods of deposition of films and coatings; film growth and epitaxy ; Physics ; Spray coating techniques ; Sprayers ; Sprays ; Surface temperature ; Waveforms
  • É parte de: Journal of thermal spray technology, 2003-03, Vol.12 (1), p.80-94
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: The influences of the dimensions of optical components and the trajectories of spray particles on the variations of the waveforms of the radiation signals from the spray particles were studied both theoretically and experimentally for correct simultaneous measurement of the particle parameters including particle velocity, surface temperature, size, and spatial distribution. Two types of filtering masks, including single-windowed and dual-windowed, were used as models in the current study. The evolution of the radiation pulse from a moving thermal spray particle was simulated through the change of the projected area of the particle image spot on the filtering mask window. The experimental detection of the thermal radiation pulses was performed for the high velocity oxygen fuel (HVOF) process using an optoelectronic measurement system. The theoretical simulation clearly showed that the characteristic waveforms of the thermal radiation signals from the spray particles are varied with the distance and orientation of the trajectories of thermal spray particles with respect to the ideal image plane of the filtering window plane. The typical variations of the characteristic waveforms obtained theoretically have been observed experimentally with HVOF spraying. The waveforms expected theoretically were correlated well with those observed experimentally. The characteristic waveforms of the radiation signals from the spray particles in a trapezoid shape with a saturated top platform contain the information for spray particle parameters including velocity, surface temperature, size, and spatial distribution. With the dual-windowed filtering mask, the particle velocity can be correctly measured with the bi-peak radiation signal in triangle-like shape, and the surface temperature may be estimated reasonably. However, the particle size cannot be estimated correctly. It was revealed that the characteristics of the waveforms were remarkably influenced by the image spot size. Therefore, the expansion of the image spot based on the relation between the image spot size of an in-flight particle and optical lens parameters obtained optically was discussed. The influence of the image spot size on the waveform characteristics was examined.
  • Editor: Heidelberg: Springer
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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