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Web inspection calibration system and related methods

A technology of inspection system and calibration system, applied in coil inspection and calibration system and related fields

Inactive Publication Date: 2011-06-22
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A problem with quantitative inspection methods (and to a lesser extent qualitative inspection methods) is the calibration of the sensor or sensors that make up the web inspection system to be able to produce units of measure that are calibrated to within the error of some known standard Data given on the coil property of interest

Method used

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  • Web inspection calibration system and related methods
  • Web inspection calibration system and related methods
  • Web inspection calibration system and related methods

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example

[0086] Example: Optical Density

[0087] We have demonstrated the ability to measure the optical density of carbon black coatings on coils. The property of interest is the optical density of the carbon black coating at a wavelength of λ = 10604 nanometers. Optical density "OD" is the logarithmic measurement of the transmittance T of the coated film as follows:

[0088] OD(λ)=-log 10 [T(λ)] (1)

[0089] in

[0090] T = I - I bkg I 0 - I bkg - - - ( 2 )

[0091] and

[0092] I = light intensity transmitted through the film

[0093] I 0 = light intensity incident on the film

[0094] I bkg = Background ambient light leak when light source is off and film is present

[0095...

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Abstract

Systems and methods for calibrating a web inspection system.

Description

Background technique [0001] Certain web properties lend themselves to optical inspection. These properties are either directly observable (such as transmittance or deviations such as scratches or other cosmetic defects), or are sufficiently related to an optically observable property to be measurable. For example, for nonwoven webs, an optically observable property that is associated with an optically observable property that is not directly observable is its ability to insulate heat, which is typically measured using thermal conductivity. Coil thermal conductivity can be measured by monitoring the rate of heat flow from one end of a known temperature gradient to the other, but this measurement is difficult to use in an in-line production type environment. However, if the configuration of the web provides for light transmission, its thermal conductivity may be related to the brightness of the light passing through it and onto a series of optical sensors. Thus, the optical si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/89G01B11/30B65H7/02
CPCG01N21/93G01N21/274B65H2515/84B65H2553/42B65H20/00B65H2557/61B65H43/00G01N21/89B65H2553/30B65H2553/40B65H2220/09B65H2220/03B65H7/02G01B11/30
Inventor 大卫·L·霍费尔特德里克·H·贾斯蒂斯约翰·A·拉姆瑟恩凯瑟琳·P·塔尔诺夫斯基许文源
Owner 3M INNOVATIVE PROPERTIES CO