Infrared sensor for the control of plasma-jet spray coating...

Details Infrared sensor for the control of plasma-jet spray coating... Infrared sensor for the control of plasma-jet spray coating...

B - Operations, Transporting

05

B

32/60, 340/155.2

B05B 7/16 (2006.01)

Patent

CA 1205545

INFRARED SENSOR FOR THE CONTROL OF PLASMA-JET SPRAY COATING PROCESSES Abstract of the Disclosure A multi-purpose optical sensor operates in the medium-to-far infrared wavelength spectral region to sense the surface temperature of plasma-jet spray coating materials. The plasma itself emits little or no radiation in the region and, accordingly, the output signal from the sensor is used to adjust electrical input and other variables associated with the plasma spray torch to insure that particles arriving at the substrate surface to be coated are, in fact, in a molten state. The sensor employs infrared interference filters and, additionally, the sensor may be used to monitor not only coating temperature but also plasma beam divergence and particle seeding density to provide other control functions.

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