US 11,826,773 B2 · Correlate thermographic image data to online scanning basis weight measurement

Abstract

Areal weight or thickness of a moving coated metal sheet along its entire cross directional width is derived by correlating thermographic image data to online, scanning basis weight measurements. Thermal imaging camera captures thermal images of a heated moving coated metal sheet material along a cross direction at a first position along the machine direction to generate sequential temperature profiles. Scanning beta gauge measures the areal weight of the moving coated metal sheet downstream at a second position. An infrared temperature sensor also measures the temperature of the moving coated metal sheet which is at a lower temperature at or near the second position. The temperature differential between the cross directional thermographic image data and the latter infrared temperature is a function of the basis weight. Basis weight measurements from the beta gauge is used to extrapolate cross directional basis weight data.

Claims19

Dependent claims

A system of monitoring the formation of a traveling sheet of material, that moves in a machine direction (MD), which comprises:

a thermal imaging device that is configured to capture a thermal image of the sheet material along a cross direction (CD) at a first position along the MD to generate sequential temperature profiles of the traveling sheet of material;
means for measuring an areal weight of the traveling sheet of material at a second position along the MD that is downstream of the first position;
a temperature sensor that is configured to measure the temperature of the sheet of material at a third position;
and
a controller that is configured to compute the areal weight of the traveling sheet of material along the CD wherein the controller is configured to use the areal weight measured at the second position and a temperature measurement by the temperature sensor at the third position to correlate the sequential temperature profiles into cross directional areal weight distribution profiles of the traveling sheet of material.

2 more elements

A roll-to-roll sheet production system for coating a metal sheet with electrode material that comprises:

a continuous source of a sheet of metal substrate which moves in a machine direction (MD);
a coater that is configured to apply a coat of electrode material onto the moving metal substrate to form a coated moving sheet;
a thermal imaging camera, located downstream of the coater, which captures a thermal image of the coated moving sheet along a cross direction (CD) at a first position along the MD to generate sequential temperature profiles of the coated moving sheet;
a beta gauge that is configured to measure the basis weight of the coated moving sheet at specific areas of the coated moving sheet, wherein the beta gauge is located downstream of the first position;
a temperature sensor that is configured to measure the temperature of the coated moving sheet at or near the specific areas;
and
a processor that is configured to compute the basis weight of the coated moving sheet along the CD wherein the processor is configured to use the basis weight measured by the beta gauge and a temperature measurement by the temperature sensor to correlate the sequential temperature profiles into cross directional basis weight distribution profiles of the coated moving sheet.

4 more elements

Dependencies are inferred from the claim text.

Correlate thermographic image data to online scanning basis weight measurement

Life of this patent

Correlate thermographic image data to online scanning basis weight measurement

Life of this patent

Abstract

Claims19