Are Security Metal Detectors Reliable?
Change of political configuration in the world has made security become a paramount concern at every aspect of life. There is always a risk of a shoot-out or a terrorist attack at any time and at any location. That is why protection of people and public places through the use of security metal detectors have become paramount. The use of a metal detector at the entrance of a public building or maybe a commercial mail can be very essential to making sure that no one can enter that location with a weapon. Thus, almost every shopping mall in the world, public buildings, government buildings and major commercial buildings are getting metal detectors installed.
Hence, the question arises as to whether security metal detectors are really reliable to detect weapons when a suspicious person with an internet to harm tries to pass through a metal detector. Basically, a metal detector sends electromagnetic signals which creates an electromagnetic field that reacts with the outer electron layers of a metal. This causes the electrons in the outer layers to become active and to change their location which in turn induces an electrical current. We know from the Maxwell Laws by James Clerk Maxwell that any electric current would be accompanied by an electromagnetic field and vice versa. Thus, this newly created magnetic field in fact reacts with the metal detector which in turn gives out a signal.
Now, all good metal detectors will have various levels of sensitivity which will allow them to be active in determining the level of the magnetic field. This in turn determines the sensitivity of the metal detector as some types of metals as well as trace amounts of metals may be hard to detect. Thus, increasing the atomic interaction of the magnetic field will help to increase the sensitivity which in turn will increase the precision of the metal detector to help detect metal which may be found in a weapon. Of course, not all metal detectors are made of the same quality as they would need to have sensitive controls and power levels in order to really be selective in finding metals. Naturally, increasing their sensitivity will also make them interact with even non-metallic objects with similar electron fields which can cause false positive signals to be formed. In this case, your personnel can adjust the settings to help increase the efficiency of the process.