What Is A Pulse Induction (PI) Metal Detector?

Ever wondered What exactly Is A Pulse Induction Metal Detector?

One of the questions we see a lot from new Treasure Hunters is “What Is A Pulse Induction (PI) Metal Detector?” Well its a pretty straight forward answer.  The PI metal detector uses electronic pulses to generate a brief magnetic field. It is not uncommon for this system to use a single coil for the receiver and transmitter. Some models have two or three coils simultaneously working together. Each coil receives a short blast of current and makes a short magnetic field. An electrical spike is received when the short blast ends, resulting in a polarity shift that reverses the magnetic field. These electrical spikes only last for one millionth of a second and it generates more current to run into the coils. This is known as (reflected pulse) also very brief and just lasting for microseconds as well. Then the system repeats itself with these short pulses of current therefore called the pulse induction system. The average pulse induction metal detector can send 100 pulses per second. Some other pulse induction metal detectors are more sophisticated with 24 pulses a second to well over a 1000 pulses per second.

 Why Does A Pulse Induction Metal Detector Work So Well?

If you think of a pulse induction metal detector like an echo, it makes more sense. If you are surrounded by limited hard surfaces and dense matter, the echo will be very brief. If you shout at the top of your lungs where hard surfaces are located in multiple directions, the sound waves reflect off each one of them, thus causing the echo effect. When you place the pulse induction metal detector over metal, the pulse generates a reverse magnetic field. The pulse of the magnetic field will end, producing a reflected pulse in the magnetic field. The target metal objects in the magnetic field adds an echo to the pulse allowing the pulse induction metal detector to read the presence of the metal object.

Why Is A What Is A Pulse Induction Metal Detector So Accurate?

The pulse induction metal detector uses a sampling circuit to determine the reflected rate of the pulse being sent. When the length is compared, the system can analyze if a different magnetic field is present in the reflected pulse. A small current would flow in the metal, and the time for the voltage to drop to zero would be increased.What Is A Pulse Induction Metal Detector?

Some of The Best Pulse InductionMetal Detectors

  • Garrett ATX Extreme PI Metal Detector
  • Garrett Sea Hunter Mark II Metal Detector
  • Garrett Infinium LS Metal Detector
  • White’s Surfmaster PI Pro
  • Tesoro Sand Shark
  • Minelab GPX 4800 and GPX 5000
  • JW Fisher Pulse 8X Pro-Version 1
  • Fisher Impulse
  • White’s TDI Pro


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  1. Dale

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