Learn How Metal Detectors Work

A metal detector is a tool that discovers the existence of metal within a particular area. Metal detectors can be handheld or arm-carrying and are available on platforms such as ckgscoop.com. They typically consist of a single handheld unit equipped with an electromagnetic sensor probe that can press into the ground or other objects. If the probe is detected, the machine will identify it and force it into its contents. In order to activate the device, it must be held at just the right level and height for maximum sensitivity, with the best results when the detection coil is directly in line with the object being detected. Because of this, metal detectors are sometimes used for other purposes, aside from metal detection.


The Manned Acoustic Scanner, or MAS, is the most widely used metal detector. However, a modified version called the Multi Unit Automatic Survey System(MUAS), also uses the electromagnetic fields. MAS consists of two handheld devices – a radar and a line scanner. The handheld unit performs the survey by picking out the reflected electromagnetic field and detecting any unwanted targets. The line scanner is connected to the computer, and the radar is linked to a monitor installed in the control room.

MAs employ the principle piezoelectricity. This involves the generation a very small electrical potential from a conducting surface in the presence a slight magnetic field. This stimulus causes the metal object to become quickly repelled by a strong electrical impulse. This enables the device to locate the point of origin of the electromagnetic field. The MAF uses radio waves at high frequencies to generate the electromagnetic field. However, the sensitivity is kept to a minimum. The sensitivity allows the device to locate the location of the target, but not so much that it will cause damage to sensitive electronic components. This metal detector has a greater range than other types.

MUASs employ a different type of magnetic field for producing the magnetic pulse needed for detecting the metal. This case, an inductor and capacitor form two independent generators. They are connected to each other by a large switching coil. The strong magnetic fields of the induction coils cancel out the low frequency impulses that are sent by the line scanner. A capacitor bank is a large number of capacitors that provide the power to generate the alternating current necessary for the operation of the induction coil. This type is more sensitive than MAs and has a higher detection rate.

The Ultrasonic Metal Detectors (UMAD) are the third type. This metal detector uses a similar principle as the MAs, but uses high-frequency sound waves to create the magnetic field needed for metal objects to be detected. This detector does not use earth’s magnetic field to detect metal objects, unlike the MAs. The UMAD uses a combination ultrasonic sound waves with an ultrasonic motor in order to generate the magnetic fields necessary for metal detection. This UMAD uses three frequencies to measure the depth underground metal deposits.

Non-metal detection is also possible with metal detectors. Metal detectors can detect the contents of shipwrecks or landmine disarmments. A metal detector cannot pick up just the metal, as other elements like salt, soil, and metal flakes can be found in large quantities. A device that can only locate one grain of sand at a distance 1 meter may not have the ability to detect a minefield. To determine the exact location of the minefield, it would be necessary for other metal detecting equipment.