Most metal detectors use one or two frequencies to find the range 2.5-60 kHz , have a certain maximum limit of detection depth and focus on search or conditionally small or relatively large objects ( even if the detector is universal ) . The frequency detector is not only the depth of detection, but the sensitivity , quality discrimination stability scan.
To improve the quality of discrimination and combining the best qualities of detectors for different purposes have been developed and successfully applied in practice, multi-frequency metal detectors . What are the advantages of multi-frequency search ? What are the technologies of metal detectors are used in these devices ? What are the best in the detection of objects fit together ?
Operating frequency range of multi-frequency metal detectors
Multi-frequency metal detectors are able to scan the ground at the same time using 4 , 17, 28, and a greater number of frequencies , using a range of operating frequency from 1.5 kHz to 100 kHz. In a number of models of metal detectors frequency can be both fixed and adjustable .
It should be noted that as a multi metal detectors can be used , some single-frequency pattern detectors. In this case, the frequency detector depends on the type of the search coil (technology VFLEX). For example , the metal detector Minelab X-Terra 705 supports three frequencies: 3 kHz , 7.5 kHz, 18.75 kHz.
However, the practical interest is the simultaneous use of a certain range of operating frequency scanning . Multi frequency BBS detection involves the simultaneous use of 17 frequencies in the range from 1.5 kHz to 25.5 kHz. In accordance with the technology used FBS 28 frequencies in the range of operating frequencies from 1.5 kHz to 100 kHz. It is the use of advanced technologies allows you to combine a multi-frequency metal detectors properties of low-frequency and high-frequency devices.
What are the advantages of multi-frequency search ?
Multi-frequency metal detectors definitely have an advantage over single-frequency devices. This is a universal detector for wide range of applications in various complexity ground. Thanks to the technology of multi-frequency search has become possible to perform complex search tasks and improve the key skills of detectors:
Low frequency allows you to search and precisely identify objects at the maximum possible depth, regardless of the size of the object , and the high frequency can detect the smallest objects with low conductivity ( nuggets ) . Thus, significantly increasing the number and range of targets in the search.
Maximum accuracy of identification signals provided by the analysis of the object for each frequency of the operating frequency range . Multi-frequency metal detectors are able to most accurately determine the type of metal target.
The ability for the most accurate discrimination and a high level of sensitivity in terms of mineralization , trash and debris on the wet sand of sea beaches. In such circumstances, the depth of detection of the search more than the single-frequency VLF detector type.
The main disadvantage of metal multi frequency is that a substantial increase in the depth of detection does not occur, but it is a little problem, since this class of detectors capable of detecting objects that are inaccessible or ” missing ” detectors of another class.
Popular multi-frequency metal detectors known manufacturers:
White’s Spectra V3i
White’s E-Series DFX 300
Minelab Explorer SE Pro
Minelab Quattro MP
Fisher CZ- October 21 “Coil Fisher CZ-3D
White’s Beach Hunter 300
Minelab Excalibur II – 10 “Coil
Minelab Safari
Fisher CZ- 21 Quicksilver
Minelab E-Trac
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