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?What is the idea of a metal detector
? What is theidea ofa metal detector
Some might think that the use of a device to detect metal limited to professionals and amateurs who want to get minerals buried beneath the surface of the earth, but in fact the metal detector has practical applications of multi-instance is used in the inspection by the security men at the entrance of the places that require a high degree of safety and security, such as airports and tourist sites, and these devices has become one of the requirements of safety and security at airports, universities, schools, theaters, government buildings, to ensure that no persons to the gunmen inside the buildings. This is in addition to their use in the exploration and the search for minerals under the surface of the earth.
Components of a metal detector
Consists of a metal detector from a simple light weight parts are as follows:
organized or stabilizer is installed and used in parts of the device to maintain constant and stable as you move the device forward and backward.
control box control box containing the electronic circuits and control devices, battery, and Almikrobrossor and speakers.
the column shaft, which connects the control box metal detector and the column is usually subject to control the length to suit the length of the person using
detector search coil is the main part in the device and the user to detect the presence of minerals and is sometimes called the search head with a gravel antenna or antenna or file loop. "We will use reagent reformer."
Parts of a metal detector
May exist in some types of metal detectors some minor differences such as that provided additional headset or be a remote control at the bottom of the column and the control screen installed at the top. But all the metal detectors easy to use All you do is on the user device and move the detector slowly over the area to be metal detectors there. When there is a piece of metal, the device will be issued a voice over the speakers as it appears on the screen some piece of information on the form and depth.
Types of metal detectors
Based metal detectors to identify three kinds of techniques and these techniques are:
* Low-frequency technology Very low frequency (VLF)
* Inductive magnetic pulse technology Pulse induction (PI)
* IT impulses Altzbzbah Beat-frequency oscillation (BFO)
We will now explain the idea of each technique from the three technologies and how to use the metal detector.
First, low-frequency technology Very low frequency (VLF)
This technique is most commonly used in metal detectors and sometimes known as induction balance induction balance Almanatisa The technology is based on the use of two files are:
A transmitter, a transmitter coil and the external file that contains a loop of wire when electrical current passes once clockwise and once counter-clockwise rotation on the rate of up to thousands of times per second.
A reception, a receiver coil and the internal file that contains the wire in the form of a radius smaller than one transmitter and works of this file work antenna to receive the signal reflected from objects in the ground and enlarge.
The alternating electric current that passes through the file transmission creates a magnetic field, the direction of the magnetic field perpendicular to the file level transmitter, and each time it changes the polarity of the current direction of change (the North Pole and South Pole) magnetic field. This means that if the file level transmitter completely parallel to the surface of the earth's magnetic field emerging into the ground or out of them in a process similar payments and withdrawals.
While the pulses of the magnetic field within the land and out of interacting with any material connected to (such as metals) collide, and this causes that generate material connected to a magnetic field is weak so-called magnetic fields of the body and have the polarity of the field opposite to the polarity of the magnetic field of the file transmission. If the file in the direction of entry to the ground is the area of the body in the direction of exit and vice versa.
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