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What is Pulse Induction Technology?
Home » Gadgets » Metal Detectors » What is Pulse Induction Technology?A less common form of metal detector is based on pulse induction, PI. Unlike VLF, PI systems may use a single coil as both transmitter and receiver, or they may have two or even three coils working together. This technology sends powerful, short bursts or pulses of current through a coil of wire. Each pulse generates a brief magnetic field. When the pulse ends, the magnetic field reverses polarity and collapses very suddenly, resulting in a sharp electrical spike. This spike lasts a few microseconds and causes another current to run through the coil. This current is called the reflected pulse and is extremely short, lasting only about 30 microseconds. Another pulse is then sent and the process repeats. A typical PI based metal detector sends about 100 pulses per second, but the number can vary greatly based on the manufacturer and model, ranging from a couple of dozen pulses per second to over a thousand.
If the metal detector is over a metal object, the pulse creates an opposite magnetic field in the object. When the pulse’s magnetic field collapses, causing the reflected pulse, the magnetic field of the object makes it take longer for the reflected pulse to completely disappear. The magnetic fields from target objects add their echo to the reflected pulse, making it last a fraction longer than it would without them.
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