| 摘要 |
<p>PURPOSE:To continuously check the characteristics of a long band-shaped magnetic substance in its lengthwise direction by setting plural sensor coils in the lengthwise direction of a bar exciting coil. CONSTITUTION:A major axis XE of an exciting coil E is turned in the width direction of a band-shaped magnetic substance M, and the sensor coils D1 - D5 are dispersely set in the direction of the axis XE. Then an alternating current is supplied to the coil E for generation of an AC magnetic field. Thus the inductive voltage is produced at each of coils D1 - D5 and changed with approach of the substance M. The changing amounts Vd1 - Vd5 of the inductive voltage of coils D1 - D5 undergo the detection of their maximum values via a means which detects the maximum input of a maximum input voltage detecting circuit, etc. Thus the characteristics of the substance M can be easily and continuously checked just by carrying out the sweep in the lengthwise direction of the substance M with rough position accuracy even though a fixed sweep position is not kept to the width direction of the substance M.</p> |
