MEASUREMENT PROBE FOR LOCATING METALLIC OBJECTS IN THE HUMAN OR ANIMAL BODY

摘要

A measurement probe (1) contains a self-adjusting oscillating circuit with a measurement coil (5) and a retroactive coil (6). The measurement coil forms part of an LC oscillating circuit. The oscillator is tuned so that the oscillation periodically ceases and is excited again only after a certain delay time. The measurement parameter is the (low) frequency of the oscillation periods. When the probe (1) approaches the metallic part, the oscillating circuit is damped. The resultant frequency shift of the oscillation periods is measured by an evaluation and indicated optically and/or acoustically or used for control purposes. A metallic object can thus be loacted rapidly and reliably by a probe of small dimensions.