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A device for detecting concealed objects behind a surface, the device being intended in use to be held near and passed over the surface. The device detects changes in the dielectric constant of the surface resulting from the presence of concealed objects, and also includes metal detector means. The

A device for detecting concealed objects behind a surface, the device being intended in use to be held near and passed over the surface. The device detects changes in the dielectric constant of the surface resulting from the presence of concealed objects, and also includes metal detector means. The design precludes interference between the two kinds of sensors.

대표청구항 ▼

A device for detecting objects behind a surface comprising a support, stray field capacitor means adapted to detect dielectric constant changes, and metal detectors means; said stray field capacitor means including transmitter and receiver plate means and being responsive to differences in the diele

A device for detecting objects behind a surface comprising a support, stray field capacitor means adapted to detect dielectric constant changes, and metal detectors means; said stray field capacitor means including transmitter and receiver plate means and being responsive to differences in the dielectric constant of the surface resulting from the presence of concealed objects behind said surface, and said stray field capacitor means being positioned adjacent an exterior face of said support, said device being intended in use to be held with said capacitor means adjacent to and for traverse along the surface; and said metal detector means comprising transmitter and receiver coils located behind the plates of the stray field capacitors means, said transmitter and receiver plate means being of electrically resistive material.