Grasping the Technology Behind Metal Detecting
Before you begin exploring the world of metal detecting, perhaps it is smart to begin your journey by understanding the technology behind metal detectors first. This will help you purchase the right detector; to help make the search so much easier. The activity is quite enjoyable and can be participated by different people. Ideally, a metal detector is quite costly but you can easily find one that will fit within your budget. Depending on the price, or course, come special features. If you wish to enjoy all the high-technology additions, then you should be prepared to spare more money.
Three types of technology used in metal detectors:
– Beat Frequency Oscillation (BFO)
Detectors using this technology work with tow wires, a large one and a small one. The large can be found at the search coil and the small one can be found within the system control pack. Both of these coils are connected to an oscillator that produces pulses of current. The pulses of current pass though the coils and this creates radio waves that travel to the system control pack to produce puseries of tones based on the frequencies of the radio waves. When the detector locates anything made of metal, like a coin or tin can, it will automatically create a magnetic field that will cause and interference with the frequency that changes the tone of the receiver.
If you are working on a low budget, the BFO is the best metal detector for you. It is the most affordable type of detector because it is the easiest to make. You will have to expect to have very short range, however, compared to that of the PI and the VLF. It is also quite poor with detecting between junk from precious metals.
– Pulse Induction (PI)
This kind of metal detector can either come with single coil or a series of coils that are meant to work together like a receiver and transmitter. When the detector receives short bursts of electrical current, it will cause some sort of magnetic field. As soon as the burst of electricity ends, the magnetic field will automatically reverse polarity. The system works like a series of echoes; and when a sharp spike of electricity is created then more pulses will be created. Each echo will correspond to a single report depending on the type of metal encountered by the detector. This is not great at differentiating between metals or coins, but where the other types are poor at, like salt-water metal detecting, this one comes in front of the line.
– Very Low Freuqency (VLF)
This kind of metal detector makes use of two search coils, where one is a transmitter coil and the other is a receiver coil. The transmitter coil transmits electricity as fast as many time per second to and from the source in the coil. The receiver could is the one that receives the frequencies that bounce back from the object detected. This metal, compared to the ones discussed above is good for detecting between different types of metals.
If you are a beginner, there is nothing wrong with buying a cheap metal detector. You can find these things advertised in magazines or being sold in department stores.
Author Bio: Welding accessories Welding equipment
Category: Advice
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