Apparatus having capacitive sensor and metal detector for detecting objects concealed behind surfaces

摘要

PCT No. PCT/US87/00666 Sec. 371 Date Nov. 19, 1987 Sec. 102(e) Date Nov. 19, 1987 PCT Filed Mar. 24, 1987 PCT Pub. No. WO87/06010 PCT Pub. Date Oct. 8, 1987.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.