After reviewing airless spray gun as one of good tools than can help you work efficiently. In this article we are going to discuss about metal detectors. A metal detector may sound familiar in your ear; some people may think about combing a beach in search of coins or buried treasure while some other people think about airport security, or the handheld scanners at a concert or sporting event. All of them are right, metal detector has indeed helped a huge part of our lives, range from leisure to safety equipment. This tool has been used in airports, office building, schools, government agencies and prisons to ensure that no one is bringing a weapon onto the premises. Furthermore, this tool has enable millions of people around the world with an opportunity to discover hidden treasures.
A typical metal detector is a light weight which consists of some parts, they are stabilizer, control box, shaft and search oil. Stabilizer is used to keep the unit runs steady as you sweep it back and forth. Control box contains the circuitry, controls, speaker, batteries and the microprocessor. Shaft connects the control box and the coil; often adjustable so you can set it at a comfortable level for your height. Another part is search coil which is the part that actually senses the metal and also known as the search head, “loop” or “antenna”. Most systems will also be provided with a jack for connecting headphones, some of them even have the control box below the shaft and a small display unit above.
A metal detector works straightforwardly, only by turning the machine on, you can move it slowly over the area you wish to search. In many cases, you sweep the search head back and forth over the sector in front of you. An audible signal will occur, once it passes over a metal object. The more advance the version of the tool, the better it detects the metal.
Metal detectors use one of three technologies
- Very low frequency (VLF)
- Pulse induction (PI)
- Beat-frequency oscillation (BFO)
Advanced metal detectors provide displays that pinpoint the type of metal it has detected and it even can measure how deep in the ground the target object is located.