Metal Detector

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Metal detector is a device that can detect metal, the basics can make a sound when it is near some metal, and the more advanced can tell what kind of metal and how deep it is down, they are using different detecting principles. A metal detector uses an electromagnetic field to detect the presence of a concealed metal object. The range depends on the strength of the field, and is usually less than one meter from the search head. The three detection methods are beat frequency oscillation, very low frequency, and pulse induction. Metal detectors were first introduced around 1930 and are used in many different applications. Read the metal detectors reviews for it will teach you about the long way that metal detection has gone through.


You can find coins, rings, jewelry, gold nuggets, caches or whatever you are searching for without knowing how your detector works. For better comprehension of that your detector is doing, however…to recognize why it just made that peculiar sound…to understand why it reacts the way it does to metals and minerals…it is necessary to learn how to a metal detector works.

Detection of Metal

Metal Detecting
When some metal is moving close to a coil the magnetic field around the coil is changed and the coil inducts some energy, called Eddie current. The same principle is true, if there is putted some energy in the coil it changes the magnetic field around the Coil. The way is also used in loudspeakers, when it is playing, the energy is conducted to the speaker, and if there is measured on the speaker and pushes a little to the membrane, the speaker generates some energy. If the terminals on the speaker are shorted, the membrane is hard to push, the coil can’t make the energy, and the coil is locked. But the difference between the speakers and the earth is that the speakers have big magnetic part to help the membrane to move, otherwise in the metal detector it is normally not a magnetic object there has to be detected, so the coil has to produce it own magnetic field. When the detectors magnetic beams are reaching a metal, the metal start to induct the fields, and reply the magnetic field in another direction / time, this change can be seen in the frequency / pulse response of the coil.
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Metal detectors are used at security checkpoints to detect metallic weapons, but they cannot detect weapons made of plastic or ceramic. They are used to find gold and coins in the ground, and can also find land mines. A stud finder is a basic metal detector that is used to find concealed studs, pipes, and wires.

Some nonrecreational applications for metal detectors are:

    * Airport security - screen people before allowing access to the boarding area and the plane (see How Airport Security Works)
    * Building security - screen people entering a particular building, such as a school, office or prison
    * Event security - screen people entering a sporting event, concert or other large gathering of people
    * Item recovery - help someone search for a lost item, such as a piece of jewelry
    * Archaeological exploration - find metallic items of historical significance
    * Geological research - detect the metallic composition of soil or rock formations

Parts of a metal director

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Control Box -
The control box contains everything which makes the metal detector work. It's like the metal detector's brain - it contains the batteries, chips, circuits and speakers.

Detector Shaft -
This is the long stick traveling from the coil to the control box.

The Coil -
This is what makes a metal detector find buried objects.

Stabilizer -
Stabilizers, though optional, are very important for an enjoyable treasure hunt.

Metal detectors tips

Determine where you are going to use the device at
There are certain features needed for certain places the device is going to be used for. If you intend to use it on the beach, the terrain wont be that rigorous. But you are going to need waterproof protection. If you wanted to use it more rigidly, then you should opt for the one that is especially made for all kinds of terrains.

Estimate for how long you are going to use the detector
The hours of operation a metal detector is determined by its model. Some are made to work for as long as 24 hours a day. Some cant perform as much. This is decided by the battery life of the device you are going to purchase. Also decide if you rather have extra batteries or if you prefer to get a charging kit.

Know your budget for it
As stated earlier, metal detectors could really be expensive. You can cut on cost if you cut on features. Try to look for the best bargain by enumerating the features you are going to need against the one that you can leave off. Also, be on the look out for brands that are big on features but small in price. Now thats a real good deal.

Research and compare metal detector the latest technologies
As with other electronic equipments, innovations seems to always happen overnight. If you are going to buy  best metal detectors today, try to know that technologies are currently employed. You do not want to be behind the technology line, right?

Get some professional advice
Get an advice from people who are the known authorities in the field of metal detectors. Although families and friends are good sources of information, they might not be as updated as the experts are. If you wanted to get the best device possible, get first-hand information from the experts themselves.

Consider durability
You have got to buy a metal detector that could withstand normal wear and tear longer than its competitors. The longer the metal detector can serve you, the better your return on investment will be.

Consider accuracy
Of course, the metal detector has to perform, and very well at that. It should deliver accurate detection. It should also carry out the task real well. It should spot treasures at once, and in a very precise manner. This is important because this is its main job out on the field. If it cannot detect small jewelry, as it should, then it is not worth buying, no matter how a good deal it seemed to be.

Get the most adaptable one
This can be determined by the metal detectors ability to be upgraded, when possible. Get the one that has a lot of devices that can be attached or added to it to make it work better. Do not settle for the detector that is relatively stagnant. If the detectors features can be enhanced further, the better buy it is.