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Vlf detectors usually operate at a frequency in the range of 3khz 30khz.
Vlf metal detector theory. In a vlf metal detector there are two distinct coils. Works as described above with two coils one transmitting and one receiving. Vlf very low frequency transmitter receiver transmitter. The most popular and most widely used detectors are vlf detectors.
For many years white s has built detectors which identify targets based on a v d i. Vlf stands for very low frequency. Electronic current is driven through the coil to create an electromagnetic field. Within it is a coil of wire.
They are ib induction balance detectors using very low frequencies. Vlf is today the most common metal detector and the one that works best as an all round detector. Inside the metal detector s loop sometimes called a search head coil antenna etc is a coil of wire called the transmit coil. The first coil sends an alternating low frequency current produced by an oscillator into the ground.
It shows how ferrous metals alter the phase relationship between the transmit coil and a. This is the simplest for of metal detector technology and is used most often in entry and mid level machines. This metal detector has 2 coils placed close together. Beat frequency oscillator technology vlf.
Electricity is sent along this wire first in one direction and then in the other thousands of times each second. Convert your smartphone into a multi frequency vlf metal detector. This video is about metal detector discrimination first principles. Very low frequency vlf detectors are the most versatile metal detector types based on the range of metallic objects you can find with them.
Vlf technology is a good detector that meets most detector needs. The outer coil produces a vlf below 30khz impulse which is directed into the ground. Multi frequency transmitting and receiving metal detectors have a signifi cant advantage in time constant discrimination and to some extent ferrous discrimination capability over the most common form of detector the vlf detector.
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