US 9,541,384 B2Granted

Method and system for optical camber measurement of flat sheet membranes, films, and webs

AssigneeCelgard, LLC

InventorsBogyeol Ham, David P. Bourcier, Alan H. Freeman

Life of this patent

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Abstract

A system, method, and device for measuring camber in a film is disclosed. The system generally includes: a flat surface with a longitudinal axis, at least three sensors spaced apart along the longitudinal axis, and a computing device operatively connected to each sensor. When the film is positioned in relationship to the sensors, the computing device computes the camber of the film. The flat surface may be a table with a film holder. At least one of the sensors may be a LED sensor. The computing device may have an output means, such as a monitor, a printer, or both. The computing device defines a straight line between the first and third sensor based on the position of the film, and the camber is a deviation of the film, measured by the second sensor, from the straight line.

Claims11

Dependent claims

A system for measuring camber in a stationary film comprising:

a flat surface with a longitudinal axis, said flat surface is part of a table, said table has a film roll holder, the stationary film lays flat on said flat surface,
at least three stationary sensors spaced apart along said longitudinal axis, each of said sensors includes a light emitting diode (LED) sensor, a scanning laser, a translating laser, a charged coupled device (CCD) camera, or a high definition video camera, the first and third sensors being at least one meter apart, and
a computing device operatively connected to each said sensor, whereby when the stationary film is positioned in relationship to said sensors, said computing device computes the camber of the stationary film by defining a straight line between the first and third sensor at an actual lateral edge of the stationary film, measuring the actual edge of the stationary film by the second sensor between the first and third sensors, and the camber is a deviation of the measurement from the second sensor measurement and the straight line, the computed camber is accurate to less than ±0.5 mm.

Dependencies are inferred from the claim text.

Facts

Application: 14/205,849Filed 12 Mar 2014 · us provisional application
Priority: 12 Mar 2013
Published: US 2014/0268175 A118 Sep 2014
Granted: 10 Jan 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G01B 11/306
For measuring roughness or irregularity of surfaces: for measuring evenness
B21B 38/12
Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the…:…
G01B 11/245
For measuring contours or curvatures: using a plurality of fixed, simultaneously operating transducers
G01B
Measuring length, thickness or similar linear dimensions