Metal Detector & Scanning
A Metal Detector is an Electronic device which detects the presence of metal passing through it (restricted by electronics to avoid alarm on detection of metal around it) or presence of metal nearby. In the Security Screening Metal Detectors, the detectors can be typically in two different formats, Hand held metal Detector and Walk Through Metal Detector, further the detectors can be classified in to different categories within the two types based on different features that are built in into the system.
The handheld unit with a sensor probe which can be swept around the objects or person to sense metal on the object or person, if the sensor comes near a piece of metal this is indicated by a the detector through tone or vibration.
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.
These Metal Detectors are part of the security apparatus of all ordinary, medium to high security zones today, without which the physical screening of metals carried on person becomes a cumbersome process and also usually are difficult issue and can pose a grave danger and lapse in the whole security system. Metal Detectors enable security personnel to more rapidly locate the source of the signal, smaller hand held metal detectors are also used to locate a metal object on a person more precisely. Walk through Detectors today offer multiple zones of sensing and indicate almost precisely the location of metal on a person.
Industrial metal detector
Industrial metal detectors are used in the pharmaceutical, food, beverage, textile, garment, plastics, chemicals, lumber, mining, and packaging industries.
Contamination of food by metal shards from broken processing machinery during the manufacturing process is a major safety issue in the food industry. Metal detectors for this purpose are widely used and integrated into the production line.
Current practice at industry plants is to apply metal detecting after the products are completely ready and are packed to check whether there is any metal contamination.
When a metal contaminant is detected in the product an alarm is raised and usually the system is programmed to stop the conveyor for removal of the contaminated product from the production line. This process is completely automated and allows manufacturing to operate uninterrupted.
Baggage or Parcel Scanners are very important part of security and safety arrangements in most of the secured areas, like a stadiums, malls, offices, secured buildings, train/metro station or airports even bus stations in many places, you may have experienced that every time you get in a station, you were asked to put your luggage through safety check.
Baggage scanner works on X Ray examination, with built in analytics it can precisely warn of dangerous material concealed deep into the baggage or parcels.
The baggage scanner works on principle of relying on the different colours to recognize the dangerous goods. Baggage Scanners are however a huge helping hand for the personnel responsible to maintain security of high secure areas such as airports, huge congregation areas, government and defence areas by allowing fast and precise scanning of all incoming baggage and parcels. Scanners are also available to scan vehicles of all sizes. Advanced technology has brought different kind of scanners and scanners are now available to scan whole body, huge vehicles, trains etc.
Scanning also is of dangerous liquids and materials, which are around in a secured area, it can be done by vapour tracers available from many reputed manufacturers to build robust security system that scans all people and material entering or loitering around a secured area.