Comparison of low frequency metal detectors and pulse induction metal detectors

Comparison of low frequency metal detectors and pulse induction metal detectors

Comparison of low frequency metal detectors and pulse induction metal detectors

  • What is a VLF metal detector? 

The most common metal detectors are very low frequency (VLF) models, which transmit energy continuously at one strong frequency, generally between 3 kHz and 30 kHz. 


  • Advantages of VLF detectors 

Most soils you will look for contain only light to moderate mineralization. In these environments, the single frequency of the VLF offers greater depth capabilities, improved target ID, and better discrimination. VLF detectors are highly energy efficient and less susceptible to external noise and interference. In short, it is the most suitable technology for detecting the widest range of targets in the most common ground conditions. 


  • Things to know about VLF detectors: 

VLF metal detectors are also commonly referred to as continuous wave or single frequency detectors. Saltwater and highly mineralized soil environments can cause loss of detection depth and target identity accuracy. Pulsed induction detectors are often preferred here. Low frequency detectors tend to be more sensitive to highly conductive metals such as silver or brass. Higher frequencies are generally more sensitive to metals with lower conductivity such as gold, platinum and lead. There are two main types of metal detector sensor technologies. VLF and PI. Here are the differences, along with their pros and cons. VLF stands for very low frequency and PI stands for pulsed induction. VLF technology is found in most metal detectors. VLF transceiver coils measure the phase shift between the transmitted and returned frequencies. PI detectors send pulses of current through their coil(s) and measure the length of time difference between the expected reflected pulse and the actual reflected pulse. 


  • How do PI metal detectors work? 

Metal targets are frequently hit by magnetic pulses from the detector. PI metal detectors emit about 100 pulses per second, but it can be less or more depending on the model. This short-duration impulse transmission causes relatively longer response signals to return from a metal target than from no target. This is seen as a form of detector echo, which results in the acoustic alert you hear. 


  • How do low frequency VLF metal detectors work? 

As the name indicates, these detectors use low frequency coils (generally less than 30 kHz). The outer coil acts as the transmitter and the inner coil acts as the receiver. The VLF detector produces an alternating current to induce a magnetic field in the transmitter coil. This field, when hitting a metal target, creates small “eddy currents” at the target. Then the detector receiver coil reads the eddy current magnetic field and the detector’s control box electronics senses the phase shift in the reflected field. It interprets this difference as a target object and produces an audible alert tone. The magnitude of the phase shift helps classify the target type.


  • Comparison between low frequency and pulsed induction detectors

  • low frequency: 

♣ Best for the average user 

♣ Well-Designed Highlighting Features 

♣ Wide price range by features 

♣ Usually used for coins, jewelry, antiquities and other metals 

♣ light weight 

  • The most versatile type of metal detectors with pulse induction: 

♣ Not affected by mineralization, so the best choice for mineral soil and saline water 

♣ Detects targets at a greater depth 

♣ The best gold detection technology 

♣ Expensive, tends to be heavier than VLF models 

♣ No discrimination mode, it will alert you on every metal target; Not great in urban It can be affected by the Earth’s magnetic field, and it can be alerted at the end of each swing 


  • Things to know about pulse induction detectors: 

Pulsed induction metal detectors are also commonly referred to as multi-frequency detectors. Target ID accuracy is reduced or absent compared to an VHF detector. Less energy efficient than VLF detectors, requiring more batteries and/or changing battery frequently. More susceptible to external noise (EMI) and interference.


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