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For beginners how metal detectors work
How metal detectors work
A metal detector is a device designed to be metal detecting lying deep in the ground or water. Since its invention, the device has found a wide range of applications in human society. Most commonly, they are used for security checks to determine the location of mines and in the industrial sector, and metal detectors have found applications in the food and pharmaceutical industries, textiles, chemicals, plastics and packaging. They play an important role in determining the existence of metal fragments in foods. Can be such pieces broken pieces of metal processing machines used in the food industry. However, sometimes you can find a lot of people using metal detectors to search for treasure and shoot for his work as well. Now, you must be wondering how these detectors actually work to see the invisible, metal or hand held metal detector work? So, let’s take a quick look at the metal detectors, and how it works.
Metal detectors: how it works
Metal detectors usually works on the basic principle is that, when electrical current passes through a coil produces a magnetic field around it. Metal detectors usually consists of oscillator that produces AC. When AC power passes through the current transmit coil in metal detectors, and produces a magnetic field around it. Now, if a metal object power connector located near the coil, eddy currents will be generated in the object, and which will produce another magnetic field around it. Metal detectors contain a coil in the last episode, called coils, which can detect changes in the Earth’s magnetic field, due to the presence of metal or metal body. Metal detectors in the modern era usually uses one of the three techniques, known as VLF very low frequency, or PI or the pulse interpolation and the BFO or beat frequency oscillation. Briefly explained these three techniques below.
Very low frequency (VLF) technology
VLF is the technology most commonly used in metal detectors. Metal detectors working on this technology contains two sets of coils coil transmitter, and the receiver coil. File sender is electricity along the file that is sent to create a magnetic field, which pushes down the down to Earth and then withdraw. The magnetism generated in metal detectors interact with any metal object or connector that comes in their way. If you experience anything like that, and then you create a vortex of currents and the magnetic field around the body.
Protected receiver coil on the other hand no effect was produced by magnetic transmission file, so affected by magnetic filed to object or metal connector. Electrical current runs through this file receiver, the metal detector passes over the connector object is produced weak magnetic filed. Coil, in turn, increases the pace and sends power (which is the same as with the frequency of magnetic filed resulting from metal) to the control box for analysis. In this way, metal detectors operate on very low frequency technology metal detecting and determining the difference between different types of minerals and depth.
Pulse induction (PI) technology
Pulse induction technology can use a single file, which can be used both in transmission and reception. Sometimes, it can also use 2-3 laps. Metal detectors working on this technology to send short bursts or pulses of current through the coils, each of which generate a magnetic field. At the end of each pulse, the magnetic polarity are reverse was suddenly and then collapse. This creates electrical spikes, which can last for a very short period of time. As spikes and collapse the pulse in the magnetic field, and another, known as the pulse is reflected through the coil. Pulse reflected lasts for a very short period.
But, when faced with metal detection metal object or connector and reflect the pulse lasts for a longer period of time. Because the pulse sent by the metal detector produces a magnetic charge filed in topic and this magnetic field leads to reflection pulse last longer. Metal detectors contain sampling circuit closely spikes and pulses reflected and sends these signals to the device, called integration. And the integration of reading, and then further convert references to stream online. The audio circuit is connected with direct current voltage produces a tone, which indicates the presence of metal or metal body.
Beat frequency oscillator (BFO) technology
Such as VLF, technology beat frequency oscillator uses two coils of wire. Single coil exists in device control box, while the other is located in the head. Coil which is in control of the smaller one is usually present in the head. Each of the coils however, remains connected to the oscillators can send thousands of electrical impulses in the second one. Radio waves are created when pulses passing through a coil of wire, and is collected by the receiver located inside the control box.
The receiver then creates audible tones based on the frequency of the radio waves. But, when passing through a metal detector, metal or metal objects, and run electricity through the coil head Search creates magnetic filed, which in turn creates another magnetic filed around metal objects. The magnetic field around the creation of metal objects interfere with radio waves created by coil in the head. This brings about change in tones produced by the receiver and change helps to detect the target object.
For beginners how metal detectors work
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