Technology Area

Metal detectors were devices designed to identify hidden metal or metal, which can be located deep within the earth. These machines are used primarily for safety reasons to detect mines, as well as a treasure hunt. More information about metal detectors, how they work, read on.

Metal detectors are specifically designed for devices that can detect metal found deep in the earth or water. Since its invention, the device has found wide application in human society. Very often used for detection and location of mines. industrial applications, metal detectors have been in food, pharmaceutical, textile, chemical, plastics and packaging. They play an important role in determining the pieces of metal in food. Metal parts can be broken pieces of machinery used in food industry. However, sometimes you can find a lot of people using metal detectors and electronics for treasure hunting and coin shooting, too. Now you’re wondering how these metal detectors really work to find the hidden metal, or working portable metal detectors. “So, let’s take a quick look through metal detectors, how they work.

Metal Detectors: How?

Metal detectors are usually based on the principle that an electric current passing through the coil creates a magnetic field around it. Metal detectors usually consist of an oscillator produces alternating current. When the AC electric current through the coil of the transmission is a metal detector, a magnetic field is produced around it. Now, if electrically conductive metal object is present in the eddy current coil build a body that produces a magnetic field around it. Includes metal detector, the mesh coil called the receiver coil, which can detect changes in the magnetic field in the presence of a metal or a metal object. Modern metal detectors are often used in one of three technologies, which are known as VLF, or very low frequency, or pulse induction of PI and BFO, or beat frequency of oscillation. These three technologies briefly described below.

Very low frequency (VLF) Technology

VLF is the technology most commonly used in metal detectors. Metal detectors work on this technology contains two coils, a transmitter coil and receiver coil. The transmitter coil is a coil that transmitted electricity to generate a magnetic field that constantly pushes the ground and then retracted. magnetic metal detectors were introduced to interfere with any metal object or the driver that comes your way. If an object is, the field of eddy currents and magnetic field is created around the controller object.

The receiver coil on the other hand, are protected against magnetic effects produced by a transmitter coil, so that only affects the magnetic filed by the driver or a metal object. electric current passes through the receiver coil when the metal detector along the body that produces a weak magnetic conductor closed. While the coil is amplified and frequency of transmission power (which is the same with the current frequency of the source of magnetic metal), the check box for analysis. Thus, the metal detector employs very low frequency technology can detect metals and distinguish between different types of metal and the depth at which they are located.

Click induction (PI) technology

Click induction technology can use a single coil, which can be used both as transmitter and receiver. Sometimes it can also be used for two of the three reels. The metal detector is working with this technology to send short pulses or current through the coils, each of which creates a small magnetic field. After each pulse, caused by the magnetic polarity is canceled and then suddenly collapse. This creates electrical points which can last a very short time. As the pin and the pulse is a magnetic field to collapse, other chains, known as the reflected pulse passes through the coil. reflected pulse lasts a very short period of time.

But when the metal detector by a metal object or the director of pulse reflecting last long. This is because the material to pass through metal detectors wrist Opposite magnetic field matter, and generates a magnetic field pulse duration was longer. Metal detectors containing a sample circuit, which is being carefully monitored by peaks and reflected pulse and sends these signals to a device called a supplement. Integrator is read, amplified and then convert the signal power. audio circuit connected to the DC voltage generates a signal indicating the presence of a metal or a metal object.

Beat frequency oscillator (BFO) technology

As the technology very low frequency, beat frequency oscillator with two coils of wire. A coil is under the control of the device, while the other is head of research. Coil that controls the frame is usually smaller than the present, looking for his head. Both the battery, however, remains connected to the oscillators, which sends thousands of pulses per second. Radio waves are generated when pulses through each coil of wire, which then collects the recipient of a check box.

The receiver then creates audio signals according to frequency of radio waves. But when the metal detector, metal objects or metal, electric currents through a coil generates a magnetic head of research presented, which in turn creates another magnetic storage around the metal object. The magnetic field around a metal object in contact with radio waves generated by the coils of the head of research. This is a change in the receiver signal to identify and change the target object.