What is the deepest metal detectors
Deep metal detectors are devices designed to search only large objects at a depth of 2-6 m that uses the principle of RF and coil, located at a great distance from each other (50-700 cm) in perpendicular planes.
For these purposes, and pulsed devices with diameter coil meter and more. These devices are good to look for chests, safes, lost equipment, etc.
Deep metal detectors are not sensitive to coins and other small items and do not distinguish between metals.
Features of deep search metal detectors
The underlying instruments for finding large objects (large considered the subject with surface area more than 400 sq. cm) manufactured by all major American firms.
Increasing the depth of search across all the devices is carried out by explode transmitting and receiving coils in the space.
The coils are arranged in two search heads are rigidly connected to each other post. In this case, one coil is in the working position of the device is parallel to the surface of the earth, the other perpendicular. Dimensions of the coils approximately 25 x 40 cm One of the coils emits electromagnetic waves with frequency 12-82 kHz, the other receives the reflected signal.
Author: S. L. Dubrovsky