| Metal detectors are certainly one of the most innovative inventions that have ever been made. Their history goes all the way back to 1882 when they were first used in the field of medicine. At this time, they were mostly used as a diagnostic tool, which could detect foreign metal objects in the body. These objects could have entered the body either through injury or ingestion. Metal detectors are effective and efficient in the way they work. This has enabled them to become an indispensable tool not only in medicine, but also in modern society as a whole. It is also worth mentioning that metal detectors are safe in terms of radioactive emissions, and they are also very user friendly. The way in which metal detectors actually function is very straightforward. They use an electromagnetic signal that is powerful enough to penetrate most solid surfaces such as rock and concrete. The typical metal detector that can be purchased from a store will consist of three components. These include a battery, the coil, and the electronic unit. In the standard metal detectors, an insulated wire runs down the telescoping shaft into the plastic coil.
All that is required is for a user to sweep the coil over the area in question. If the detector makes a beeping sound, then it means that it has detected the presence of a metal object or traces of metal. At this junction, it should be said that the coil is perhaps the most important part of a metal detector. This is because it uses the battery to generate the powerful electromagnetic signal that is required for a metal detector to work. So, in a sense, the coil acts as a sort of transmitter. The coil also consists of a network of very sensitive wires. These wires are called receivers, because they are responsible for reacting to any magnetic field they sweep over. The receiver is sensitive enough to detect and differentiate between the signatures of different metals. It is this quality of receivers that enables some metal detectors to identify the specific metals it detects. This feature of metal detectors is also made possible by microprocessors in the electronic box. These microprocessors are able to quantify the time between when the coil passes over a magnetic field to when the receivers obtain the magnetic charge. This is called measuring the phase shift and it can be used to identify different metals.
As soon as the receiver detects a metal object, it will immediately send the electromagnetic signal back to the electronic box. The electronic box in turn transfers the signal to a speaker, which causes the detector to make a beeping sound. The most sophisticated and advanced metal detectors allow the user to adjust the sensitivity of the coil. This allows for more accurate and specific metal detections. Nowadays, metal detectors come in different models and sizes. They are also not as expensive or inaccessible as they used to be. This means that just about anyone can own a metal detector. The majority of private individuals who own detectors use them for their favorite leisure activities and hobbies. When not used in hospitals and for recreational purposes, metal detectors are used to safeguard public areas from potentially dangerous metal objects and weapons.
The fact is that metal detectors not only work in a straightforward way, they are practical and also very easy to use. This is certainly one of the reasons why they have a lot of appeal. With more metal detector manufacturers engaging in further research and development, there is no doubt that in the future, metal detectors will work in even more sophisticated fashions. |
METAL DETECTORS TYPES
