Scanning combination thickness and moisture gauge for moving...

Details Scanning combination thickness and moisture gauge for moving... Scanning combination thickness and moisture gauge for moving...

G - Physics

01

N

324/53, 324/29.6

G01N 27/22 (2006.01) G01N 33/34 (2006.01) G01R 27/26 (2006.01)

Patent

CA 1277707

Abstract of the Disclosure A combination caliper/moisture sensor in the form of a scanner in the cross-direction of sheet material being manufactured by a papermaking machine includes a pair of capacitive plates on opposite sides of the moving sheet material and in substantial contact with it which are utilized for measuring capacitance between the juxtaposed plates which are spaced in accordance with the caliper of the paper. Then a magnetic circuit which provides a flux path through the paper is utilized for measuring caliper which is the independent variable of the capacitance equation which, when solved, yields the dielectric constant. Since there is a known relationship between percent moisture and the dielectric constant, the percent moisture of the sheet material can be determined.

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