Metal detectors TR-IB (Transmitter Receiver - Induction Balance), theory. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / metal detectors
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Recently, metal detectors TR-IB (Transmitter Receiver - Induction Balance), or simply TR, which are based on the principle of "reception-transmission" (Fig. 1.4), have been especially popular. In such devices, called balanced metal detectors, the coil system is balanced to zero mutual inductance.
The main feature of TR-IB devices is that it is not the reflected signal of the transmitter that enters the receiving coil, but the signal, the source of which is eddy currents excited on the surface of a metal object.
Rice. 1.4. Simplified block diagram of a metal detector operating on the transmit-receive principle
The transmitting signal generated by the reference oscillator is fed to the transmitter and then to the transmitting coil. When a metal object appears in the radiation zone of the transmitting coil, eddy or surface currents are initiated on its surface under the influence of the VLF signal. These currents are the source of the secondary signal, which is received by the receiving coil of the metal detector. From the output of the receiver, the signal is fed to the analyzer, where its parameters are estimated. Based on the analysis performed, an appropriate signal is generated for the display unit.
It should be noted that the main advantages of such metal detectors are high sensitivity, the possibility of detuning not only from the ground background, but also from various debris. And, of course, such devices allow you to determine the type of metal. However, the main disadvantage of balanced metal detectors is the complexity that arises in the manufacture and balancing of the coil system.
Author: Adamenko M.V.
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