Basis weight gauge standardizing method and system

Details Basis weight gauge standardizing method and system Basis weight gauge standardizing method and system

G - Physics

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354/28

G01G 19/00 (2006.01) G01D 18/00 (2006.01) G01G 9/00 (2006.01) G01G 17/02 (2006.01) G01G 23/01 (2006.01)

Patent

CA 1217278

ABSTRACT OF THE DISCLOSURE An improved technique for standardizing a basis weight gauge used to measure the weight per unit area of sheet material is described. The gauge is of the type that has a radiation source and detector defining a gap through which the sheet material is fed and across which the radiation is directed. The amount of radiation detected is a measure of the basis weight of the material. The gauge also includes a standard disc having a predetermined and stable basis weight and which can be swung into the radiation path. The method involves firstly constructing two calibration curves each showing basis weight on a first axis versus a function of transmission ratio on a second axis, the first calibration curve being constructed without simulated dirt and the second calibration curve being constructed with simulated dirt. The next step is the construction of a standardization curve by plotting the displacement of one calibration curve relative to the other measured parallel to the first axis. The gauge is standardized during operation by placing the standard disc in the gap without the sheet material in the gap and determining the standardize transmission ratio,determining a correction factor based upon the standardize transmission ratio and applying the correction factor to the uncorrected basis weight to determine a corrected basis weight.

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