Patent ID: 6012329
Filing Date: 2000-01-11
Classification: G01B,G01M

Abstract:
A method of testing tires, whereinbefore 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, wherein for testing the tire on a motor vehicle(a) the motor vehicle with the wheel mounting the tire to be examined is driven so that such tire is on a motor driven roller set(b) a test head arranged to produce interferograms is moved up to the tire to be at a predetermined distance therefrom,(c) the checking of the tire for defects is performed on a first test segment of the tire,(d) the wheel is further rotated by the roller set by an amount equal to a test segment, and(e) and the steps (c) and (d) are repeated until the entire tire has been examined.