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What Metals Cannot Be Detected By a Metal Detector?

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What metals cannot be detected by a metal detector

In this adventurous world, there is more and more things are yet to be discovered. Metal detectors can give you a ticket to unfold the adventurous world. Metal detectors are the best instrument one should use to unfold the hidden treasures that are buried underground. Most people have seen metal detectors in a shopping mall, stations, airport, etc.

It can be used for military or security purposes and to find or to detect any unusual object like guns, bombs, etc. Many people do not know how it is used to detect metal, gold, etc. After buying a good metal detector can increase the chances of finding treasures, you also need to know something. All metals cannot be detected with metal detectors. This article will give a brief idea about how metal detectors work and why some of the metals cannot be detected by a metal detector.

Definition of metal detector

The metal detector is one of the finest inventions till now. One can understand its use while pronouncing the word “Metal detector.” A metal detector is an instrument or an electronic device that gives the signal closer to any substances. Long ago or even now, metal detectors are used to detect or find the object buried underground. Metal detectors usually consist of the handled unit with a high sensor probe, which generally indicates ions surrounding it.

Basic principle

The working principle of metal detectors is related to the magnetic field. It transmits a magnetic field and inspects a return signal from the environment and the target. The magnetic fields which are transmitted vary in time with high-pitched audio signals. The transmit electronics produce an electric current that changes with the magnetic transmitter in a transmit coil. The receive coil or the receiver is usually connected to signal and receive processing electronics. The receive coil and transmit coil sometimes act as the same coil.

Also, sometimes we can notice a change in the transmitted magnetic field, which leads the electric current to flow in the direction of metal targets. These electric current are also known as eddy currents, also generate a weak magnetic field, but the intensity is different from the transmitted magnetic field in strength and shape. These regenerated metal detectors help us to detect the targets of the metals.

The relation between magnetism and electric field

In physics, we have read that magnetism will also be there if there is an electric field. But if you do not know how an electric field is related to magnetism, this will help you get it. One of the most important things one should know is how magnetism is associated with an electric field. If one ever came across the coil of wire connected to the battery, one can feel the electromagnetic field. An electric field and magnetism are like a couple. If you find an electric field, you will automatically find the magnetism.

To make you understand better, we can refer to the example of your daily electric appliances that you use. That electricity we get, provided to us by the power plants, is usually produced by the generators, traditionally made of copper wires. Thus when the wire rotates, the magnetic field is generated around it, and the electricity automatically generates inside.

In 1860, a Scottish scientist named James Clark Maxwell genuinely solved this problem and applied his mathematical formula. Basically, from that mathematical formula, we get to know that if there is a changing electric current, you will get a changing magnetic field. That is why magnetism and an electric field are interrelated to each other. And it also gives us a brief idea of how does the metal detector works.

Is electromagnetism related to metal detectors?

Electromagnetism plays an essential role in metal detectors. Without electromagnetism, it cannot detect any metals. Each metal detector has its way of working. However, science works behind every metal detector as the metal detector consists of a coil called a transmitter coil. So when an electric current flows through it, it generates the magnetic field around it.

So when it is brought near to some metallic substances, the magnetic field around the coil affects the atoms inside the substance. And thus, it indicates the presence of any metal or gold. Also, Maxwell states that for a changing electric field, there will be a changing magnetic field too. So, in this case, electromagnetism is directly related to metal detectors.

How it detects metals?

People know one thing: when a metal detector is brought near to some metallic substances, it buzzes. But they do not understand why it buzzes. There is a science behind it. At first, the metal detector consists of a battery that activates the transmitting circuit, which helps the electricity through the cable to the search coil. The search coil of metal detectors transmits an electromagnetic field into the ground. The control box contains an electronic sensor that is where the transmit signals are generated. And also, the received signals which are processed get converted into a target response.

Metals that cannot be detected by the Metal detector

The working principle of the metal detector is based on electromagnetism. In other words, it means that they release electromagnetic fields that vary with time and listen for a magnetic wave from conductive items. Stainless steel is a metal that is too difficult to detect.

Again there is a science behind it. The electrical conductivity produced in stainless steel is very weak compared to metals. That is why the metal detector cannot locate or detect this type of metal. Though sometimes, some metal detectors also failed to detect metals. Every metal detector is designed differently. So one should use a metal detector which has the following qualities.

  • The electrical conductivity should be strong
  • The frequency should be higher
  • The search coil should be prominent.

Metal detectors can be used for many purposes. It is also used for the safety and security of the world. But if you want to use this to experience nature, you should follow the article. This article can give you the knowledge before going to unfold the mystery of nature.

About the Author Mike Chua

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