Method and apparatus for testing tires on a motor driven roller set

US6012329A · kind A · utility

Assignee

• BEISSBARTH GmbH · DE

Inventors

• Ronald Kelm-Klager · Landsberg, DE
• Hermann Bux · Adelzhausen, DE

Key dates

• Filing date: Jun 9, 1998
• Grant date: Jan 11, 2000
• Expiry date: Jun 9, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M17/027
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In the tire examination method before and after an alteration in the tire pressure a respective interferogram is produced of the tire surface using coherent radiation and the interferogram is converted into a modulo 2 .pi. image, which for its part is processed to obtain a gray value image and in the case of which from a comparison of the gray value images information concerning any defects present in the tire is obtained. For testing a tire the wheel, which bears such tire to be tested, is arranged on a driven roller set by driving the vehicle with the wheel, a test head is moved toward the tire to be at a predetermined test distance therefrom for producing such interferograms, at a first test segment of the tire examination for defects is performed, the wheel is incrementally rotated by the roller set by an amount equal to the size of a test segment and so many test segments are examined that the complete tire is tested. The tire testing apparatus possesses an air pressure means for altering the tire pressure, a test head and a computer.