| 摘要 |
<p>An apparatus and method for determining the characteristics of conducting objects such as coins, metal foil, machine parts or wire based on the pulsed coil induction principle. Each coil 41, 42 is both pulsed and monitored for return voltage so that magnetic fields add, thus reducing the effect of movement of the object relative to the coils. A transverse coil 43 may be used for obtaining extra information about edge dimensions. The coils are of a rectangular shape and are all similar, thus providing for a uniform magnetic field over a sufficiently large area of an object path. <IMAGE></p> |
