| 摘要 |
<p>A compact detector device for detecting the presence of objects hidden behind a surface incorporates both capacitive and magnetic induction sensors, combined such that interference between the sensors is minimized. The device is traversed over a surface to be inspected, the device having transmitter and receiver plate mean for stray field detection responsive to changes in local dielectric constants, and transmitter and receiver inductive coils for detecting the presence of metals, the coils being located behind the plate of the stray field detector. In one embodiment, a plurality of visual display means connected with adjacent detector portions provides a progressive display on traversing of the detector past an object to be imaged enabling a pictorial presentation of a concealed object. Use of an Application Specified Integrated Circuit (ASIC) to generate input signals to the two classes of detector is integrated with a microcomputer to digitize the detected outputs.</p> |
