TR Metal detector (Transmitter Receiver ) Is one of the first types of metal detectors. This electronic device was first created to find hidden in the depths of the earth metal objects.
TR metal detector is also called balanced metal detector . The transmitting and receiving coils are balanced to zero mutual induction. The device operation is based on the principle of induction balance and the scheme ” method – transfer” .
The main feature TR metal detector is that the receiving coil is not received reflected signal from the transmitter , and a signal source which eddy currents are excited on the surface of a metal object.
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With two coils ( receive and transmit ), and the corresponding transformation of the signal registration was made possible effect of the phase shift between the emitted and the received signal. Thus, TR metal detector which has a function of discrimination.
Design and operation of the TR metal detector
Device has spaced apart , arranged orthogonally to the coil or two balanced coils arranged in a single plane ( head search ) .
TR metal detector coils are balanced in such a way that when a signal is applied to the transmitting coil (transmitter) to the output of the receiving coil (receiver ) contains the minimum signal (close to zero).
The transmitter emits a sinusoidal signal. Operating frequency range of 50-100 kHz. When a metal object in the radiation zone of the transmitter on the object surface eddy (surface ) currents . These currents are a source of a second signal , which is received by the receiver.
With the output of the detector signal is fed to the analyzer and there is assessment of its parameters. Analyzes the signal amplitude at the receiving coil and the phase shift between the transmitted and the received sinusoidal signals. Based on the analysis the specific signal for the display unit .
Advantages and disadvantages of TR metal detector
The main advantages of TR metal detector are a high sensitivity , the ability to distinguish between black and non-ferrous metal.
Depth detection device TR metal detector is large enough to slightly mineralized and not littered the ground. For example, a coin or a ring can be detected at a depth of 30-35 cm The possibility of tuning out from the background soil.
TR metal detector is useless when looking for highly mineralized soils and marine beaches. For the device is characterized by the phenomenon of self-excitation , which is caused by scanning properties of the soil.
The complexity of the production and balance coil system should also be attributed to the shortcomings TR devices. TR technology in its pure form is quite rare. It is used primarily in conjunction with the technology VLF (Very Low Frequency ) . Technology VLF / TR (Very Low Frequency / Transmitter – Receiver ) Nowadays is one of the practices used by manufacturers of metal detectors.
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