Metal Detector

Alexander Graham Bell invented the first crude metal detector in 1881In 1881, Alexander Graham Bell

invented the first metal detector. As President James Garfield lay dying of an assassin's bullet, Alexander Graham 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

Gerhard Fischar - Portable Metal DetectorIn 1925, Gerhard Fischar invented a portable metal detector. Fischar's model was first sold commercially in 1931 and Gerhard Fischar was behind the first large-scale production of metal detectors.

According to the experts at A&S Company: "In the late 1920's, Dr.Gerhard Fisher, the founder of Fisher Research Laboratory was commissioned as a research engineer with the Federal Telegraph Co. and Western Air Express to develop airborne direction finding equipment. He was awarded some of the first patents issued in the field of airborne direction finding by means of radio. In the course of his work, he encountered some strange errors and once he solved these problems, he had the foresight to apply the solution to a completely unrelated field, that of metal and mineral detection.

Detectors

Metal detectors use electromagnetic induction to detect metal. Uses include de-mining **the detection of land mines**, the detection of weapons such as knives and guns, especially at airports, 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.In its simplest form, 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 metal, which is electrically conductive, is close to the coil eddy currents will be induced in the metal, and this produces an alternating 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.Surface Mount Technology (SMT), microprocessor control, Digital Signal Analysis, software upgrade capability and the use of High-Quality materials for the search probes and for the other mechanical parts. Tests carried out under controlled conditions by Authoritative International Bodies demonstrate that the MIL-D1 provides overall superior performance in the areas of detection distance, soil compensation capability and immunity to external interference.State-of-the-Art Digital Metal Detectors for Ground Searching applications Metal Detector has obtained the highest marks in all controlled comparative tests for detection, ease of operation, reliability, ease of maintenanceDeep Search Underground Metal Detector A device performing accurate detection of large metal masses deeply buried, as Unexploded Ordinance, insensitive to ground magnetic anomalies.Metal Detector obtained the highest marks in all controlled comparative tests for: Detection, Ease of operation, Reliability, Ease of maintenance.metal Detector and Gold Detector Technology