What is a Pulse Induction Metal Detector?

A pulse induction (PI) metal detector is a type of metal detector coil technology that works by generating a high-frequency magnetic field. This field is used to create an electrical current in the metal object being detected. This is often referred to as the eddy current effect.

In order for this process to work, metal conductors must be present in the item being checked or detected. When a pulse induction metal detector detects this change in electrical current it emits a short pulse of an audio tone. The faster this tone repeats itself, the greater chance there is that a metal object of the appropriate size is present within the detector’s range.

How Pulse Induction Metal Detectors Work

Metal detectors consist of a transmitter that emits electromagnetic waves, which interact with the metal object and induce eddy currents. The detector’s receiver converts these eddy currents back into electrical signals, which are then processed by a microprocessor and translated into an output tone or spoken response. Pulse induction metal detectors work on this same principle, but instead of detecting all metallic conductors, they detect only those with ferromagnetic properties.

Pulse induction metal detectors are unique because they can be used in highly mineralized ground locations or water where standard VLF (Very Low Frequency) technology detectors would fail or simply wouldn’t work. This is because pulse induction metal detectors do not respond to minerals in the ground that can confuse VLF detectors. This is due to another property pulse induction metal detectors possess: they resonate at a specific frequency range. Thus, if an object of the wrong frequency is introduced to the detector it will not register a response.

Standard metal detectors function using electromagnetic induction. This means that they emit an alternating current in order to create a magnetic field, which induces eddy currents when objects are placed within their range. The detector then senses these currents and emits electrical signals from its internal speaker or display screen.

The Benefits of Using a Pulse Induction Metal Detector

There are several benefits of using a pulse induction metal detector over standard detectors. One benefit is that these types of metal detectors can function in conditions where standard detectors fail. This is because, unlike with standard detectors, the object must have ferromagnetic properties in order to be detected by a pulse induction metal detector. Some of these objects include things like gold nuggets or coins, which would not be detectable by standard detectors.

PI metal detectors are also capable of being used in long narrow spaces where there is no form of line-of-sight between the object and the detector’s sensor. This is due to another property pulse induction metal detectors possess: they resonate at a specific frequency range. Thus, if an object of the wrong frequency is introduced to the detector it will not register a response.

The Disadvantages of Using a Pulse Induction Metal Detector

These types of metal detectors do have some disadvantages. The frequency range at which they resonate is limited to those objects with high iron content, such as gold nuggets. This is why it’s important to know the types of objects you’ll be searching for before selecting a metal detector.

Another drawback is that because this type of metal detector works through magnetic induction, electrical interference from surrounding sources can cause false signals. Noise from things like power lines, other detectors, and even cell phones can cause the metal detector to emit false signals. This also means that these types of detectors are not permitted at airports due to the risk of erroneous signals.

How to Use a PI Metal Detector

Pulse induction metal detectors are very easy to use. Since they don’t emit radio waves or other forms of radiation, there is no need for the user to be concerned about keeping a minimum distance between themselves and the object being searched. This also means that special safety precautions are not necessary when using this type of detector.

To operate the device, simply ensure the area is clear of people and objects. Then, turn on the device and sweep it slowly back and forth over the area you want to search. Ensure you keep the coil parallel to the ground at all times in order to get an accurate reading of what lies beneath your feet. When searching for metal objects you’ll want to keep moving until you get a steady tone coming from the metal detector’s speaker or screen. This means you’ve passed over a source of metal and can now search the area where the tone came from more carefully. Once you’ve found your target, simply dig it up!

PI metal detectors are very simple to operate, as well as being highly effective. They can search a very large area and they can be used to find objects which would not respond to standard metal detectors.

The Different Types of PI Metal Detectors Available on the Market

Pulse induction metal detectors can vary in price based on various factors. One of these is the frequency range at which they emit signals. Some pulse induction metal detectors are designed to search for objects with higher iron content, such as gold nuggets. Other types are built to detect different metals entirely, like copper or silver. There are even some advanced models which offer the ability to detect multiple types of metals, so you’ll want to do your research before buying.

Pulse induction metal detectors are a great choice for many different people and purposes. With their high-quality detection abilities and ease of use, they can quickly become one of your favorite ways to treasure hunt!

Final Thoughts on Buying and Using a Pulse Induction Metal Detector

Pulse induction metal detectors are a great option for any person who wants an efficient way to search large, open spaces. Pulse induction metal detectors are very efficient at searching for both high-iron objects like gold nuggets and low-iron objects like silver or copper.

Pulse induction metal detectors are very simple to operate and highly effective. They can search a large area and they can be used to find objects which would not respond to standard metal detectors. Pulse induction metal detectors are an excellent choice for both beginners who want to get started in the hobby, as well as experienced detectorists!

These types of metal detectors do have some disadvantages. The frequency range at which they resonate is limited to those objects with high iron content. Some of these detectors are designed to search only for metal objects with a specific iron percentage, while others can detect multiple types of metals. There are even some advanced models which offer the ability to detect multiple types of metal, so you’ll want to do your research before buying.



Written by Danny Nash

I love metal detecting, history and sharing that with you. Read more of Danny's articles.

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