Method for controlling a spray process

Fluid sprinkling – spraying – and diffusing – With signals – indicators – recorders – meters or changeable... – With spray material quantity or flow indicating means

Reexamination Certificate

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C427S446000

Reexamination Certificate

active

06892954

ABSTRACT:
A method is provided for controlling a spray process that may include measuring a particle property associated with a spray jet of particles, calculating a centroid for the measured particle property and using the calculated centroid as a control parameter for controlling the spray process. At least one operating parameter associated with the spray process may be adjusted in response to the calculated centroid to change a trajectory of at least a portion of the particles within the spray jet of particles. The operating parameter may be adjusted so that an ensemble of particles having the highest measured temperature and an ensemble of particles having the highest measured velocity and an ensemble of particles having the highest measured flow rate are moved more closely together to create a common region proximate a surface of a substrate to be coated by the spray process. This may be done manually prior to a coating run or continuously during a run using a closed-loop feedback circuit (43) in a computer-controlled (38) spray system.

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Koch, D., et al Diagnostic of in flight particle properties and resulting coating qualities on atmospheric plasma spray process. Thermal Spray 2001: New Surfaces for a New Millennium, (Ed.) C.C. Berndt, et al. Metals Park, OH: ASM International, 2001, pp. 751-758.

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