Security Metal
Here are Todays Amazing Security Metal Deals
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 ZMODO 8 CH H264 CCTV Security DVR Outdoor IR Camera System 500GB Hard Drive $239.99 Time Remaining: 18h 10m Buy It Now for only: $239.99 Buy It Now | Add to watch list |
 540 TVL 36 HIGH LEDS SONY CCD IR CCTV SECURITY CAMERA $44.99 Time Remaining: 23h 1m Bid now | Add to watch list |
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More Great Information on Security Metal:
HOW METAL DETECTORS WORK by Herbert Heath Jr
When you see people walking on the beach with their metal detectors, you always have to wonder if they're finding anything other than pocket change. The fact is that thousands of people use a treasure hunting metal detector as an instrument of modern-day piracyâ"though nowadays searching for buried treasure is completely legal!
Metal detectors are also used commercially, in buildings such as court houses, airports and prisons. Having an airport security guard with a handheld metal detector can help all travelers have peace of mind.
But whether they are being used for adventure or security, metal detectors are all similar both in their components, and how they work.
Their Components
The search coil is the most important part of any metal detector. Also known as the "search head", this is the device that senses that the metal is there.
The shaft is the long part that connects the control box to the search coil. Whether you're tall or short, many metal detectors for sale offer adjustable shafts to custom fit your height.
The control box holds the processor, circuitry, batteries and speaker. There is also often a jack for headphones connected to the control box.
Many metal detectors that are used for treasure hunting also have stabilizers. These surround your forearm and help keep the metal detector stable.
How They Work
Each metal detector works in similar ways, though the parts may vary. For instance, the most common type of metal detector uses Very Low Frequency (VLF) technology. It has two distinct coils, the receiver coil and the transmitter coil.
The transmitter coil loops around the shaft and contains a thin metal wire within it. Setting the control box to the desired frequency, electricity is shot through this wire in both directions. This current creates an electromagnetic field. As this field pulses up and down the shaft, it interacts with objects perpendicular to it. These objects then create their own slight magnetic field.
The receiver coil is essentially an antenna that amplifies frequencies it finds coming from the target objects found by the transmitter coil's electromagnetic field. This amplification is sent to the control box, making the high-pitched metallic noise we can all recognize. The stronger the noise, the closer that object is to the ground. Objects that are too deeply buried will not be able to produce a magnetic field strong enough for the receiver coil to find.
There are also less common types of metal detectors, such as the pulse induction or beat-frequency oscillator metal detectors, however, they all work in a similar mannerâ"they all contain at least one metal coil that generates a magnetic field that reacts with the metal objects for which they are searching.
Buying a Metal Detector
There are many reasons to buy a metal detector. Whether you want a fun way to bond with your family, find a little money on the side, or use it for security purposes at your place of business, the metal detectors for sale on-line and in stores will help you with all your metal detection needs!
There are many reasons to buy a metal detector. Whether you want to bond with your family, find a little money on the side, or use it for security purposes at your place of business, the metal detectors for sale on-line and in stores will help you with all your metal detection needs!
Article Source: http://www.earticlesonline.com/Article/HOW-METAL-DETECTORS-WORK/637970
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