Infrared sensor for the control of plasma-jet spray coating and electric are heating processes

摘要: A multi-purpose optical sensor operates in the medium-to-far infrared wavelength spectral region to sense surface temperature of plasma-jet spray coating materials. This plasma itself emits little or no radiation this and, accordingly, output signal from is used adjust electrical input and other variables associated with torch insure that particles arriving at substrate be coated are, fact, a molten state. The employs filters additionally, monitor not only but also beam divergence particle seeding density provide control functions. In another embodiment, measure size metal pool presence an electric arc, as case melting pouring form ingots, arc parameters so pool. It may locate position foreign matter on manipulate move away region, thereby restricting amount such which enters poured stream, thus producing cleaner ingots having improved freedom inclusions.