Today, there are many metal detectors that have different models with different uses. In this text, we want to compare the two metal detectors PI and VLF.
VLF metal detectors
Usually, these types of metal detectors are very light and small in size and have a small disk with a size of 25 cm. In these metal detectors, the depth of excavation in the ground is less than one meter and it has a low depth.
These types of metal detectors (VLFs) are also called recreational metal detectors. Such devices are mostly used to find metal on the ground. It should be noted that these devices have a digital display and have a resolution of 80%. These types of devices can only separate ferrous metals from other objects with a suitable resolution.
Advantages of VLF metal detector
This type of device uses a strong resolution system that has the resolution of metals such as gold, copper and silver. The resolution of this type of device is much higher than pulse devices.
Also, VLF metal detectors consume less battery than other systems. Other advantages of these devices include their greater sensitivity to non-ferrous metals. Also, high power in accurate point detection is another advantage of this metal detector.
Defective pulse metal detectors
The depth of exploration of these types of metal detectors is much less than pulse metal detectors, they can not work in certain environmental conditions and the ability to deepen these devices is greatly reduced.
This device also shows high sensitivity to minerals and minerals in the soil. Another disadvantage of these metal detectors is that they are not underwater and can not explore well.
Pulse PI metal detectors
Today, this type of metal detector is one of the most widely used metal detectors used among explorers. One of the most famous pulse devices is the GP 5000 metal detector (gpx 500) which is a product of Minlab company. Lorenz Z1 metal detector (Lorenz Z1), which is a product of Lorenz Deep Max, is also one of the famous metal detectors. In the technology of these metal detectors, two separate coils are not required. In these devices, a coil with different sizes is used as a transmitter and receiver. In this technology, current pulses are shown through a charging coil. Each pulse has a mixed magnetic field. When the pass is turned off, these magnetic fields will also disappear, causing a sloping amplitude in the coil, which creates a current from the coil that is called (back emf). When metal objects are coiled around a magnetic field, a pulse creates an opposite magnetic field in them. The generated wave is then amplified by a preamplifier and transmitted to the audio part of the device.
Advantages of Pulse Metal Detectors
One of the important points in this type of devices is that they are not sensitive to minerals in the ground. Since the soil of Iran has many contaminants, this device does not show sensitivity to these contaminants. Another advantage of these devices is their higher depth than VLF devices. It should be noted that pulse metal detectors can have a depth of 3 to 3 meters, which is much higher than VLF devices. Of course, in the catalogs of pulse devices, the amount of depth up to 8 meters is also written, which can be said that this issue was created only for the sale of more and better products by profiteers and is the only way to abuse people.
Disadvantages of Pulse Metal Detectors
These devices are less sensitive to precious metals such as gold. And their resolution is much weaker than other examples. One of the disadvantages of pulsed metal detectors, which is also very important, is its excessive battery consumption.