Hand Held Metal Detector

Hand-Held Metal Detector Working Principle

A Hand-held metal detector works based on the principle of electromagnetic induction. This detector consists of a coil of wire that creates a magnetic field when an electric current flows through it. When a metal object is introduced into the magnetic field, the magnetic field is distorted and this distortion is detected by the detector.

As the metal object enters the magnetic field, it generates its own magnetic field. This field produces an electric eddy current within the metal object. The current, in turn, produces an opposite magnetic field to the original magnetic field created by the coil.

The distortion created by the metal object’s magnetic field alters the resonant frequency of the search coil, which produces an audible and visual signal. The detector analyses the frequency shift and the signal, indicating the presence and possibly the location of the metal object. Some handheld detectors also have the ability to differentiate between different types of metals such as ferrous and non-ferrous metals, by measuring the magnetic response of the metal object. Overall, a handheld detector acts as a metal detector that can be used in a variety of settings, such as security screening, metal detecting, and treasure hunting.

The operator moves the hand-held detector over the surface under inspection until the metal is detected. The operator will then pinpoint the location by moving the detector back and forth over the area. They will keep the detector close or touch the surface until they locate the metal object, visualizing its location.

These detectors are used to quickly and easily scan people or objects for metal objects. They are commonly used in security settings such as airports, courthouses and government buildings to detect weapons or other prohibited items. They are also used in construction and excavation sites to locate buried metal pipes or cables.

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