| 摘要 |
<p>A mineral value detector consisting of a search head having an aperture therein, at least one primary field inducing means to provide a primary field, and at least two secondary field receiving means to receive said primary field, the search head being configured in a balanced arrangement and adapted to provide a detection signal (1) having at least one peak therein when said field is disturbed by a mineral value proximate the search aperture, and a discriminator to determine if the detection signal is a bona fide signal (3). The discriminator may operate on a comparison of sequential, opposite-polarity peak valued detected (5, 6) from passage of subject material through the aperture.</p> |
