Patent Document ID: 20050219530
Application ID: 11093396
Patent Status: 0

Claim One:
1. A method of adjusting a monitoring apparatus, said monitoring apparatus being adapted to carry out a measurement operation by receiving waves from a detection area at each position on a standard direction and outputting data for identifying at least position of a target object of detection in said detection area based at least on intensity of said received waves, said method serving to correct an axial displacement of said detection area in the direction of rolling; said method comprising the steps of: providing a target having a detection surface, said detection surface having a specified peripheral shape and having a pattern of bright areas with a larger reflectivity and dark areas with a smaller reflectivity, said peripheral shape and said pattern being such that a waveform of W-form or inverse W-form is obtained due at least to said specified pattern if said measurement operation is carried out with said target placed in front of said monitoring apparatus and with said detecting area facing said detection surface, said waveform being such that a standard position of said detection surface in said standard direction can be calculated therefrom; placing said target in front of said monitoring apparatus by orienting said detection surface according to said standard direction; carrying out said measurement operation at least twice by each time changing the position of said monitoring apparatus in the perpendicular direction to said standard direction; and determining the axial deviation of said detection area in the rolling direction based on change in said standard position calculated from said waveform.