Tips for Using Metal Detectors on Beaches

By Antoinette Ayana 

Using metal detectors on beaches is a great way to pass some time. Not only are you surrounded by a serene setting with waves crashing and seagulls overhead, you may even wind up finding something of value. Here are some secrets that may help you make some great finds.
The Gridding Method of Metal Detecting on Beaches
If you don't have a lot of experience in metal detecting, you may be surprised to know that there are specific terms associated with different techniques. One of these is gridding, which is a technique that detectors use to cover small areas of beaches. This is different from random searches where you look across larger expanses of sand. Griddling involves picking a well-traveled location and following a specific pattern. You could, for instance, start in one area and then head for the low tide line. Make one step over, turn around, and head to the area where you started.
Or, you could also try walking sideways at the high bank line, go about 15 feet, step over, and walk back. You could walk in a circular pattern instead, starting small and going in larger and larger circles. Whichever approach you choose to take, by gridding you are creating lines in the sand with your feet so that you know where you're searching so you don't re-trace your steps.
The Saltwater Hunting Method of Metal Detecting on Beaches
This is another known technique that takes advantage of low tide to access areas of the water that are difficult to get to otherwise. The challenge to this method is that you may have a hard time pinpointing any possible targets. You will also need a waterproof metal detector.
One of the advantages to this approach is that there is less trash the farther you get from shore. The chances of finding worthless pieces of aluminum such as bottle caps are lessened. This is where having a more sensitive device can come in very handy. Your detector may be able to locate tiny objects that others trying this method may have overlooked. Even if you don't find a lot by using the saltwater hunting method, there's no need to be concerned. The sand is always being shifted by the tide, so you'll have another chance to find something exciting.
Beaches are at their best in the summer because that is the time where more people are swimming, sunbathing, and surfing. This will always lead to more potential treasures to find. Go to the most popular areas first and start detecting either early in the morning or later in the evening. These are the times where you will have more room to look without having to worry about running into a lot of people.

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Metal Detectors Explained

By Peter Sibierski 

Metal detectors are devices specially designed to detect metals that lie deep in the water or ground. When it was invented, it is specifically designed for screening or security purposes and to locate mines. There is a lot of industry which uses metal detectors such as food processing, textiles, pharmaceuticals, chemicals, packaging and plastic industries. It is important to check the foods for metal debris to avoid food poisoning. Those metals debris can be broken down to pieces on the machinery in food processing industry. On the other hand, you may find a lot of people that use metal detectors in hunting for treasures and old coins that are electronically driven. So, you might wonder how this thing work to detect metals that are hidden or how metal detector that is hand held work. So let's take a closer look at these detectors to know how they work.
Metal Detectors: How Do They Work?
Generally, metal detectors work on the fundamental principle that when electric current pass through a loop it will produce a magnetic field. One of the basic parts of a detector is an oscillator; it will produce the alternating current. Magnetic field is produced when an alternating current or electricity pass through the transmittal coil which is present in metal detectors. So, when a metallic object or a conductor is present close to the coil, it will generate a current in the object that will produce another magnetic field on it. There is another coil in the loop that can be found in detectors that is called the receiver coil that can detect magnetic field changes because of the presence of a metal or a metallic object. The latest metal detectors use these technologies; VLF very low frequency PI pulse induction and BFO beat-frequency oscillator. Let us discuss about these technologies:
Very Low Frequency (VLF) Technology
The most common technology used in metal detectors is VLF. There are coils in sets of two which is the receiver and the transmitter coil. The coil where electric current is sent and creates magnetic fields which constantly push down to the ground and pull back is called the transmitter coil. Magnetic field gets generated by the metal detector which reacts in any metallic or conductor that passes on it. When it encounters the object, the electric current and the magnetic field is formed around the conductor.
In reciprocal, the receiver coil is protected from the influence of the magnetic field which the transmitter coil produces and it is only affected by the conductor and /or the metallic object's magnetic field. The electricity that runs on this receiver coil produces a magnetic field that is weak when a conductor gets near the metal detector. In turn the coil will amplify and send the frequency of the electricity that has the same frequency with the magnetic field that comes from the metal to make analysis in the control box. Through this, the metal detector that works on VLF (very low frequency) will be able to determine disparity among the kinds of metals, the depth of the position when being detected.
PI Technology
A single coil is used in the PI technology (pulse induction) that is feasible on both transmitter and receiver. However, it is also possible to use 2 to 3 coils. Metal detector that works in this kind of technology can send a short burst and /or pulse of current in the coil that will generate a shorter magnetic field. In every pulse, the generated magnetic field will reverse the polarity and will eventually collapse. Electrical spike can be created and will last in very short period. When the magnetic field, pulse and spike collapses, a known current called as reflected pulse will occur and into the coil it will run. This reflected pulse can only last in seconds.
The reflected pulse can last in a longer period when a metallic or a conductor will get contact with the metal detector. The reason of this is caused by the opposing magnetic field that is produced by the metal detector. Metal detector is a device that has an integrator which contains a sample circuit that can be monitored closely on every spike. The thing that convert the signal, reads and amplifies will convert the signal into a direct current. The connected audio circuit when getting the right amount of electricity will produce tones that indicate a presence of a metallic object.
BFO Technology
The beat, frequency oscillator is like the VLF (very low frequency) that uses two wire coils. The first coil of the device can be found in the control box, and in the search head lays the second coil. The first coil which can be found in the control box most of the time is smaller compared to the second one in the search head. The two coils on the other hand, stay connected in the oscillator that sends out number of thousand electric pulses per second. When the pulse passes through every coil radio waves can be created and the receiver that can be found in the control box collects them all.
After this you will hear clear tones like the radio wave frequency which is created by the receiver. The current of electricity that is moving in the coil in the search head will create a field of magnet that creates a new field of magnet around the metallic object as the metal detector passes over the metals. The creation of radio waves from the search head coil is being interfered by the magnetic field created by the metallic objects. This produces a change of tone in the receiver this changes can helps in detecting the object in being targeted.
There are certain types of metal detector made through this kind of technology that we can see in our everyday life. These metal detectors can distinguish the difference between objects and know the place that they are in and not just detect the metallic target or objects with electrical conduction. We hope this metal detector article can give you the answer to your common questions with regards to how these machines and mechanism works.

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The Best Metal Detectors For Kids

By Frank Pandozzi 

Often times I am asked.
"What are the best metal detectors for kids." My answer is pretty much the same.
"One that is inexpensive, and easy to use."
I have seen moms and dad's buy metal detectors for their children that were way too much technology for the child. The thinking is that if they purchased a high-end detector, the child's finds would increase, and the child would stay with the hobby. Unfortunately, it does not work that way.
First, kids being kids, their attention spans are all over the place. Any of us fortunate enough to raise children understand this. Give a child a puppy today, and tomorrow he or she wants a parakeet.
Second, high-end metal detectors are too technical for the average child. Yes, I know kids today are computer geniuses, and game freaks, however, that in itself is a problem. Here's why. Children cannot shoot their enemies with a metal detector, and if they cannot shoot their neighbors with it, or they cannot turn the TV on by pointing the detector at it, then you are off to a bad start with the idea of buying them one.
Now combine that with the fact that a metal detector actually needs to be brought outside and used, think about this. Kids today do not go outside, unless they are not fortunate enough to have indoor plumbing. So you now have the issue of the learning curve of a high tech metal detector, remember "attention span", and the need to go outdoors to use the detector, and you end up with a costly metal detector gathering dust in the corner of your home.
If you want to purchase a metal detector for your child, the best metal detectors for kids are priced between $125 - $250. The detectors in this price range are easy to use, and they are lightweight. This type of metal detector is called a "turn on and go" model. This means that all the child needs to do is turn on the detector, and start swinging.
It is true that with the low end priced models there will be a loss of a true reading, meaning that the detector may sense a piece of junk below the ground, like a pull tab, yet the sound it emits may lead you to believe it's a coin. However, if you tell the child that for every piece of junk that is dug, it means they will be closer to finding a coin, which is true. Find ways to make it fun for the child to have a metal detector.
I have been with young children using $125 detectors, and they were having fun digging pull-tabs. Why? I told them that if they dig enough pull-tabs, they could string them together, and make a very long chain. I told them that the longest pull-tab chain in the world is a mile long, and then I tease them to make one longer. Okay so I lied about the mile long pull-tab chain, but at least I kept them occupied.
© 2010 Frank W. Pandozzi

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