Patent ID: 6308570
Filing Date: 2001-10-30
Classification: G01B,G01N

Abstract:
A method for determining the transit time of an ultrasonic pulse through a moving web of thin material using a rotatable wheel ultrasound apparatus, comprising:measuring a transit time of a transit time ultrasonic pulse through a liquid within a rotatable tire of a rotatable wheel ultrasound apparatus;determining a speed of ultrasound propagation from the transit time of the transit time ultrasonic pulse;measuring a transit time of a wheel-reflected pulse from an interior surface of the rotatable tire at a liquid-tire boundary;determining an instantaneous transducer-tire boundary distance from a speed of pulse propagation through the liquid and the liquid-tire boundary transit time;measuring a transit time from a nip boundary at the outside of the rotatable tire; anddetermining an instantaneous tire wall thickness.