Another popular type of IB metal detectors are those with dual frequency settings.
All of the mentioned above conditions apply to this type of detectors as well as to the MFT.
The difference in this case is that having the search head system to work only on two frequency setting (one at a time) will
provide an opportunity to have maximum Q on at least one of the two frequency setting. That will give a good chance for better depth
penetration and discrimination accuracy.
The most common type of IB detectors are the single frequency metal detectors.
Metal detector set to work at only one frequency, have the best chances to achieve good depth penetration and discrimination
accuracy.
The next popular type of metal detectors, capable to compete for better depth, are the PI metal detectors.
Relative to the transmitted in the ground energy, the PI detectors are with lower efficiency than the IB. However the fact that average
PI metal detector can detect targets deeper under ground than average IB detector, is due to the very high level of the transmitted
signals (few hundred volts pulses). With that allowance in their basic principal the PI metal detectors can win almost any
competition for depth.
However, the greatest disadvantage for the PI detectors is the lack of reliable discrimination. Regardless of all claims on the PI
market, the PI principal can not allow good discrimination to be achieved.
The best metal detectors regarding depth penetration and discrimination accuracy are the IB detectors tuned in total or as close as
possible to total electro-magnetic resonance.
The reasons:
It is not possible for any kind of loop to achieve higher Q than the Q as a result of electro-magnetic resonance.
In comparison to a standard, not tuned in resonance search head system, one tuned in total resonance can exhibit up to 100 times
higher sensitivity to any desired target. That fact alone lead to use of lower electronic amplification, lower electronic instability and
much better resistance to thermal changes for the electronic circuit.
A RX loop tuned in total resonance will act also as 10 th order band pass filter against any external interference, which will
almost eliminate the need of any interference prevention filters.
In comparison to off resonance RX loop, one tuned in total resonance is much more sensitive to phase and amplitude changes,
which fact can guarantee best depth penetration and discrimination accuracy as can be achieved with any metal detector.
All of the mentioned above conditions apply to this type of detectors as well as to the MFT.
The difference in this case is that having the search head system to work only on two frequency setting (one at a time) will
provide an opportunity to have maximum Q on at least one of the two frequency setting. That will give a good chance for better depth
penetration and discrimination accuracy.
The most common type of IB detectors are the single frequency metal detectors.
Metal detector set to work at only one frequency, have the best chances to achieve good depth penetration and discrimination
accuracy.
The next popular type of metal detectors, capable to compete for better depth, are the PI metal detectors.
Relative to the transmitted in the ground energy, the PI detectors are with lower efficiency than the IB. However the fact that average
PI metal detector can detect targets deeper under ground than average IB detector, is due to the very high level of the transmitted
signals (few hundred volts pulses). With that allowance in their basic principal the PI metal detectors can win almost any
competition for depth.
However, the greatest disadvantage for the PI detectors is the lack of reliable discrimination. Regardless of all claims on the PI
market, the PI principal can not allow good discrimination to be achieved.
The best metal detectors regarding depth penetration and discrimination accuracy are the IB detectors tuned in total or as close as
possible to total electro-magnetic resonance.
The reasons:
It is not possible for any kind of loop to achieve higher Q than the Q as a result of electro-magnetic resonance.
In comparison to a standard, not tuned in resonance search head system, one tuned in total resonance can exhibit up to 100 times
higher sensitivity to any desired target. That fact alone lead to use of lower electronic amplification, lower electronic instability and
much better resistance to thermal changes for the electronic circuit.
A RX loop tuned in total resonance will act also as 10 th order band pass filter against any external interference, which will
almost eliminate the need of any interference prevention filters.
In comparison to off resonance RX loop, one tuned in total resonance is much more sensitive to phase and amplitude changes,
which fact can guarantee best depth penetration and discrimination accuracy as can be achieved with any metal detector.
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