History of metal detector

History of metal detector

In 1881, Alexander Graham Bell invented the first metal detector. As President James Garfield lay dying of an assassin’s bullet, Bell hurriedly invented a crude metal detector in an unsuccessful attempt to locate the fatal slug. Bell’s metal detector was an electromagnetic device he called the induction balance.

Simply put, a metal detector is an electronic instrument which detects the presence of metal nearby. Metal detectors can help people find metal inclusions hidden within objects, or metal objects buried underground. Metal detectors often consist of a handheld unit with a sensor probe which the user can sweep over the ground or other objects. If the sensor comes near a piece of metal, the user will hear a tone, or see a needle move on an indicator. Usually, the device gives some indication of distance; the closer the metal is, the higher the tone or the higher the needle goes. Another common type is the stationary “walk through” metal detector which is used for security screening at access points in prisons, courthouses, and airports to detect concealed metal weapons on a person’s body.

The simplest form of a metal detector consists of an oscillator producing an alternating current that passes through a coil producing an alternating magnetic field. If a piece of electrically conductive metal is close to the coil, eddy currents will be induced in the metal, and this produces a magnetic field of its own. If another coil is used to measure the magnetic field (acting as a magnetometer), the change in the magnetic field due to the metallic object can be detected.

The first industrial metal detectors were developed in the 1960s and were used extensively for mineral prospecting and other industrial applications. Uses include de-mining (the detection of land mines), the detection of weapons such as knives and guns (especially in airport security), geophysical prospecting, archaeology, and treasure hunting. Metal detectors are also used to detect foreign bodies in food as well as in the construction industry to detect steel reinforcing bars in concrete and pipes plus wires buried in walls or floors. Source thoughtco.com

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With the kind of reliability that we build into our products right from the development stage, a field failure is a rare occurrence. But should the need arise, we have a prompt and effective after-sales service supported by a team of trained efficient engineers, at our end, as well as with our dealers. The minimum downtime is achieved by plug-in card assembly system and readily available standardized spares. www.siddhiepl.com Siddhi Equipments Pvt. Ltd., was established with the aim to provide world class Metal detectors, Security Equipments and Electronic Test & Measurement Equipments. The Management has a wide experience over 20 years in the field of Metal detectors, Security Equipments & Electronic Test & Measurement Equipments. Presently we are manufacturing metal detectors like Hand Held Metal Detector, Walk through Door Frame Metal Detector (Single zone, Multizone & Portable), Letter Bomb Detector, Under Vehicle Search Mirror, Search Light & Burglar Alarm System. Siddhi is an ISO 9001-2008 certified company. Their esteemed users are Defence, Paramilitary Forces, Police departments, Security service providers, PSU’S & Private establishments.

The first industrial metal detectors were developed in the 1960s and were used extensively for mineral prospecting and other industrial applications. Uses include detecting land mines, the detection of weapons such as knives and guns (especially in airport security), geophysical prospecting, archaeology and treasure hunting. Metal detectors are also used to detect foreign bodies in food, and in the construction industry to detect steel reinforcing bars in concrete and pipes and wires buried in walls and floors. Source Wikipedia

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