The metal discrimination

The metal discrimination In the category treasure hunting more articles and learn more information about The metal discrimination Reviews Price Specifications Features Image manuals videos Accessories All this in metal detectors for gold.

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The metal discrimination

The metal discrimination

 

In theory, for each type of metal, the signal received by the take-up reel shows a phase shift specific compared to the signal of the transmitter coil. It is therefore possible to identify one metal to another: a metal target in copper will be higher than that of a ferrous of phase delay. A metal detector can then detect that target copper and do not detect the ferrous. In reality, the discrimination of a VLF metal detector is disturbed by the high mineralization (we shall see in chapter mineralization that he feels as of iron) and depends on the depth of burial as well as the orientation of the target:
A non-ferrous target under a mineralized tile can sound like a ferrous, detection limit currency can sound like a ferrous, a ferrous in detection limit can sound like a non-ferrous… The discrimination is to ensure that the device emits a sound when it detects a target which the phase shift than a certain value set by the potentiometer setting. There is a second system called notch: it allows to accept a value of phase shift. You can theoretically detect only the range corresponding to the gold. In reality the notch causes mistakes in identification of the metal classic discrimination. Some metal detectors give thanks to a meter of the information about the identity of the metal target. There again you confront with the same errors of identification of metals. discrimination of the metal detector must always be set to the minimum. You must eliminate only small ferrous. Do not attempt to discriminate the aluminium for example, to move on, you would lose the fine medieval currencies. When you are in difficult terrain (strong mineralization and small ferrous), try to dig small ferrous signals, you may be surprised.

The mono-ton system

Mono-ton discrimination is discrimination “all or nothing”, it means that all metals that are selected with the potentiometer cannot produce sound (in theory because in practice a ferrous deep may produce false signals), other metals will produce a unique sound. This makes simpler detection, but in hand it does not allow as much finesse as the multi-ton system in the acceptance and rejection of metal targets.

The multi-ton system

The multi-ton discrimination is discrimination that offers more choice, because it will produce a different sound following the metallic nature of the target, for example serious to a ferrous (in theory because there still in practice a ferrous deep may sound bass/midrange), medium for a fine medieval currency or an aluminium paper, acute for a large currency or an object, which will allow the prospector to hear the ferrous without so dig it, and possibly on sectors with high potential, identify low deep ferrous signals to them (as they may be at the end of the non-ferrous metal targets located in detection limit), which does not permit discrimination mono-ton.