Pulse Induction Metal Detectors: The Pros And Cons
One kind, pulse induction metal detectors, represent a recent development that works differently from the traditional metal detector, but is not necessarily better. Let's take a look at where pulse induction metal detectors improve upon the original and where it fails to work as well. How They Work A traditional metal detector consists of two coils of metal. Current is passed through one loop to create a magnetic field, which extends into the ground and will hit any metal there, causing it to generate its own magnetic field, which can be detected by the second current. Pulse induction metal detectors, however, only have one loop, which generates a brief magnetic field, which collapses almost right away. If it hits a metal object, the resulting magnetic field created from that object will be reflected back, and the machine detects how long it takes for that field to collapse; it takes more time if the object is metal. How They're Better The main advantage to pulse induction metal detectors is that they can detect metals in areas with high mineral content, unlike traditional metal detectors. Because traditional metal detectors are based on the conductivity of the metal in the ground, any environment where the ground itself can conduct well, such as salt water, will make detection nearly impossible; the area would seem to be made entirely of metal. Pulse induction metal detectors are also more reliable at greater depths, which means you can find items that are further below ground. How They're Worse The main disadvantage to pulse induction metal detectors is that there is no easy way to determine what sort of metal you've found. Traditional metal detectors will react with slightly different response times for different metals, which can be measured and calculated; that is, gold will respond slightly different than iron. However, because pulse induction metal detectors work more like bouncing a signal off a surface instead of passing the signal through it, they cannot determine this. In this way, pulse induction metal detectors have new disadvantages that exist as tradeoffs for the advantages they provide, making it a technology that's new but not necessarily better. |
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