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US 2006/0132808 A1Published application
Thin thickness measurement method and apparatus
AssigneeHoneywell International Inc.
InventorsW. Jasinski, Frank Haran
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AssigneeHoneywell International Inc.
InventorsW. Jasinski, Frank Haran
Estimating the term…
Techniques for non-contacting thickness or caliper measurements of moving webs or sheets employ a sensor device that includes a first sensor head and a second sensor head that are spaced apart to define a path through which the moving web travels. The sensor device projects a laser generated, multiple points pattern onto the upper surface of the moving web. Pattern recognition algorithm analysis of the pattern identifies the orientation, e.g., tilt, of the moving web. The device further measures the film tilt, the distance between the first sensor head and the first web surface, the distance between the second sensor head and the second web surface, and the distance between the two sensor heads to provide a highly accurate on-line thickness measurement of the moving web.
A system, for measurement of the thickness of a web having a first surface and a second surface, that comprises:
The system of claim I wherein the means for detecting the image and converting the image into an electrical signal corresponding to an electronic image comprises a detector that is arranged adjacent the first surface to receive the image that is projected onto the first surface of the web;
The system of claim I wherein the means for projecting a pattern include an active optical device such a acousto-optical deflector or galvanometer driven mirrors.
The system of claim I wherein the image that is projected on the first surface of the web has a defined profile and the first sensor head comprises (i) means for measuring the vertical distance from a first location on the first sensor head to a position on the first surface of the web that is situated vertically along a first vertical axis and (ii) means for measuring the horizontal distance from a reference point on the first surface of the web to the first vertical axis.
A non-contact method of measuring the thickness of a web having a first and a second surface, said method comprising the steps of:
Dependencies are inferred from the claim text.