METHOD OF DETECTING SMALL METAL OBJECTS AND DEVICE FOR REALISING SAID METHOD Russian patent published in 2010 - IPC G01V3/08 

FIELD: physics.

SUBSTANCE: detection zone in which the search object is located is exposed to low-frequency electromagnetic and microwave fields. The value of the low-frequency electromagnetic field sufficient for onset of mechanical vibrations of the search object in the detection zone is selected. The microwave signal reflected from the detection zone and modulated by mechanical vibration parametres of the search object is received. The useful signal with frequency Ω is isolated from the received modulated microwave signal, where Ω is frequency of mechanical vibration of the search object. The device has a low-frequency generator connected to an inductive radiator, an autodyne microwave transceiver with an antenna, a phase detector, a low-pass filter and a display.

EFFECT: increased sensitivity and reliability of detection.

2 cl, 2 dwg