Clay sensor

Details Clay sensor Clay sensor

G - Physics

01

N

73/55

G01N 21/31 (2006.01) G01N 21/86 (2006.01) G01N 33/34 (2006.01) G01N 21/35 (2006.01)

Patent

CA 1319273

ABSTRACT A sensor (2) for use in measuring the clay content of a sheet (8) of paper during its continuous manufacture. The sensor produces electrical indications of the intensity of radiation transmitted through or reflected from the sheet (8) for each of a plurality of selected narrow bands of infrared radiation. The selected bands include a measurement band having a center wavelength selected from a peak absorption range (46,48,50) for kaolin and a reference band having a center wavelength selected from outside a peak absorption range for kaolin. The radiation bands are selected to minimize error resulting from differences in sensitivity to absorption by water. R870080

591613

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