H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/32
H04N 7/18 (2006.01) F27D 21/00 (2006.01) G01J 5/00 (2006.01) H04N 5/33 (2006.01) G01J 5/60 (2006.01)
Patent
CA 1319416
P 10 11457 IMAGING OF PULPING CHEMICAL RECOVERY BOILER SMELT BED ABSTRACT OF THE DISCLOSURE An apparatus is described which is capable of producing an image of a smelt bed of inorganic chemicals collected at the bottom of R kraft pulp recovery boiler. The image produced is free of interferences of fume particles and gaseous radiation which have obscured prior attempts to view hot surfaces under such environmental conditions. The apparatus includes an industrial closed circuit video camera fitted with an infrared imaging detector or vidicon tube. An objective lens obtains the image. An optical filler interposed between the lens and the videcon is a key element of the invention and is selected to reject radiation less than about a micrometer to avoid fume interference. The filter is further selected to reject all but limited ranges of radiation to avoid gaseous species overlying the smelt bed which are strongly emitting and absorbing. As an example, a spectral filter centered at 1.68 micrometers with a band width of 0.07 micrometer is suitable for imaging a kraft recovery smelt bed.
466783
Ariessohn Peter Carl
James Richard Kent
Diamond Power International Inc.
Osler Hoskin & Harcourt Llp
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