Metal detectors category TD (Time Domain), theory. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / metal detectors
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Among the detectors of metal objects that use a pulsed signal with subsequent evaluation of its change in time and belong to the relatively new category TD (Time Domain), several basic groups can also be distinguished.
The first includes the so-called radar metal detectors. In such devices, the parameters of the microwave signal reflected from a metal object are evaluated. In this case, the amplitude of the reflected signal depends not only on the size of the object, but also on the conductivity of the material. In addition to the amplitude, the reflected signal delay is also analyzed, which carries information about the depth of the metal object.
The second group of metal detectors of the TD category is made up of devices in which a pulsed signal is also used as an emitted signal. However, the duration of these pulses is much longer than in radar metal detectors. This ensures the excitation of eddy currents in a metal object, information about which is analyzed in the corresponding cascades. Such devices are sometimes referred to as TR-PI (Transmitter Receiver - Pulse Induction) or simply PI.
It should be noted that the operation of all devices of this category considered above is based on the "transmission - reception" principle. However, the main structural difference, for example, between TR-PI type metal detectors and TR-IB type devices is that the same coil can be used as a receiving and transmitting coil in pulsed devices.
Author: Adamenko M.V.
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