Metal Detecting - Understanding The Technology

By Author: Jeffy Kingston
Total Articles: 3
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The metal detecting for fun or profit can be one of the most exciting and rewarding hobby. You can watch online metal detectors videos. A metal detector can cost very little, as low as $ 50 or as high as $ 400 for a top of the line model. This is a hobby where you really get what you pay for because the more expensive top of the line detectors use the most advanced technology and have the best features available.
Metal detectors use one of the three types of technology:
BFO (beat frequency of oscillation) - Using metal detectors technology BFO have two wire windings, a large winding is located in the winding Research detector, the other small winding of the wire are located in the package control system. Each winding of wire is connected to an oscillator that produces pulses of the current. These pulses of current passing through the coils produce radio waves. A receiver housed in the package system control receives the radio waves and made a series of tones based on the frequencies of radio waves. When the detector search coil passes over a coin or other metal item a magnetic field is created around the article ...
... of coin or metal, this magnetic field causes interference with the frequency of radio waves produced by the winding of research. And changes the tone was produced by the receiver.
Pi (Pulse Induction) - Metal Detectors using PI technology sometimes use a single coil or series of coils working together as a transmitter and receiver. Short bursts of electrical current are send through a coil of wire, causing a magnetic field. When the brightness of the electrical current ends the magnetic field reverses polarity. An electrical transient is created sharp, then more pulses are created, the process repeats and works as a whole series of echoes, giving a different report or echo depending on the metal it encounters. This type of metal detector is not very good at discriminating between different types of metals or coins, but it is good to use where some other types of metal detectors have trouble functioning, as in sea ​​water, and metals can be detected much deeper with this technology than others.
Metal detectors of VLF (very low frequency) - using this technology have two search coils. A winding called the "transmitter coil 'transmits electricity rapidly many times per second, first in one direction around the coil, then in the other direction. The other coil called the acts "winding receiver" just as the name implies it receives frequencies or data that come or 'bounce' back objects that transmitter coil detects in the search area. This type of metal detector is great for it's ability to be able to distinguish different types of metals.
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