Wenyuan Xu from Oakdale, MN, age 85

Web Inspection Method And Device
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US Patent:

6950547, Sep 27, 2005
Filed:

Feb 12, 2001
Appl. No.:

09/781372
Inventors:

Steven P. Floeder - Shoreview MN, US
James A. Masterman - Lake Elmo MN, US
Matthew P. Peick - Eagan MN, US
Carl J. Skeps - Lakeville MN, US
Steven R. Wageman - St. Paul MN, US
Wenyuan Xu - Oakdale MN, US
Xi Yu - Woodbury MN, US
Assignee:

3M Innovative Properties Company - St. Paul MN
International Classification:

G06K009/00
US Classification:

382143, 382141, 382144, 382145
Abstract:

An imaging device for sequentially imaging a portion of a continuously moving web to provide a digital data stream which is then analyzed by a single computer without the used of dedicated signal processing hardware. Techniques for operating on the data stream from an imaging device are disclosed, particularly including operations based on blob information stored in terms of starting position and segment run lengths in a crossweb direction. These allow definitions of blobs to be accumulated in a line-by-line fashion, and allow classes of defects commonly found in continuous web manufacturing to be identified with far less computing power than was previously required. In particular, in the challenging application of inspecting flexible circuits, data rates in excess of 10 mega-pixels/second are achieved and successfully processed.

Estimating Propagation Velocity Through A Surface Acoustic Wave Sensor
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US Patent:

7677101, Mar 16, 2010
Filed:

Dec 17, 2004
Appl. No.:

10/596674
Inventors:

Wenyuan Xu - Oakdale MN, US
John S. Huizinga - Dellwood MN, US
Assignee:

3M Innovative Properties Company - St. Paul MN
International Classification:

G01N 29/024
US Classification:

73597, 73 6179
Abstract:

Techniques are described for estimating the propagation velocity through a surface acoustic wave sensor. In particular, techniques which measure and exploit a proper segment of phase frequency response of the surface acoustic wave sensor are described for use as a basis of bacterial detection by the sensor. As described, use of velocity estimation based on a proper segment of phase frequency response has advantages over conventional techniques that use phase shift as the basis for detection.

Low Cost Thickness Measurement Method And Apparatus For Thin Coatings
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US Patent:

6252237, Jun 26, 2001
Filed:

Jul 15, 1998
Appl. No.:

9/116009
Inventors:

John A. Ramthun - Hudson WI
Steven P. Floeder - Arden Hills MN
Arthur T. Manning - St. Paul MN
Lanny L. Harklau - Stillwater MN
Gregory D. Kostuch - Mahtomedi MN
Jack W. Lai - Lake Elmo MN
Wenyuan Xu - Oakdale MN
Assignee:

3M Innovation Properties Company - St. Paul MN
International Classification:

G01N 2164
US Classification:

2504591
Abstract:

A method and apparatus for measuring the thickness of a coating on a coated surface. The method uses a solid state array of light-sensitive elements to measure light emitted from a fluorescing coating composition. The intensity of the emitted light corresponds to the thickness of the coating composition, and provides a fast and accurate measure of coating thickness.