Patent ID: 7659729
Filing Date: 2010-02-09
Classification: G01B,G01S

Abstract:
1. A method for measuring the width-direction center position of a moving strip of material, wherein a first width-direction end of the material strip is irradiated with electromagnetic waves from a first antenna, the electromagnetic waves reflected by the first width-direction end are received by the first antenna, the position of the first width-direction end of the material strip is determined on the basis of the time difference between the point when the electromagnetic waves were emitted and the point when the reflected electromagnetic waves were detected, a second width-direction end of the material strip is irradiated with electromagnetic waves from a second antenna, the electromagnetic waves reflected by the second width-direction end are received by the second antenna, the position of the second width-direction end of the material strip is determined on the basis of the time difference between the point when the electromagnetic waves were emitted and the point when the reflected electromagnetic waves were detected, and the width-direction center position of the material strip is measured from the position of the first width-direction end and the position of the second width-direction end.