Types of metal detectors:
Metal detectors are designed around one of three technologies:
- Very low frequency
- Beat frequency oscillation
- Pulse induction
Very low frequency-based metal detectors are widely used for the detection of several metallic objects. It consists of two round coils and a phase demodulator, which filters the signal from a receiver. As different types of metals reflect a different kinds of magnetic signals, the main function of the phase demodulator is vital as it can be programmed to focus only on the desired range of the signal.
Beat frequency oscillator-based metal detectors are simple and have a low-cost design. The detector uses two separate detection coil but lacks the desired signal filtering ability. This device is used mostly by beginner-level users.
Pulse induction-based metal detector has a more specialized unit that enables detection of the metallic objects buried under the ground surface. The large and advanced model of this detector can detect weapons at security checkpoints. It contains only one coil and uses the timed pulse method for better accuracy.
Metal detectors are nowadays widely being used for security and defense areas. Whereas its area is not confined only to the security field, it is also being used to find precious metallic objects those are present deeper under the surface.
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