Apparatus and method for sensing multiple parameters of...

Details Apparatus and method for sensing multiple parameters of... Apparatus and method for sensing multiple parameters of...

G - Physics

01

N

354/21, 354/25,

G01N 22/04 (2006.01) G01N 21/86 (2006.01) G01N 21/89 (2006.01) G01N 22/00 (2006.01) G01N 23/16 (2006.01) G01N 21/31 (2006.01)

Patent

CA 1264353

Abstract A method and apparatus for simultaneously generating spatial profiles of moisture, thickness, and basis weight across a moving web of paper in a paper making machine. The apparatus includes a plurality of means for generating first and second beams of coherent microwave radiation and for generating signals propor- tional to the intensity of radiation applied to, reflected from, and transmitted through the web. The incident, reflectance, and transmittance signals for the two frequencies are used to solve simultaneous equations to generate moisture, thickness, and basis weight values at various positions across the web.

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