Metal detectors are devices designed to detect metals. They are mostly used to detect metals that lie deep in the water or ground. Initially, it was used for screening or security purposes as well as to identify mines. There are a lot of industries that use these kinds of detectors, including food industries, pharmaceuticals, packaging, chemicals and plastic industries. Make sure to inspect the foods for metal debris, in order to avoid food poisoning. Those metal debris can be turned into pieces on the machinery. On the other hand, you will find many people who use these devices in hunting for treasures. In this article, you will come to know how these devices work.
Generally, metal detectors work on the basic principle that when the electric current pass through a loop, it will create a magnetic field. One of the basic parts of a detector is an oscillator that will generate the alternating current. This field is produced when an electric current pass through the transmitter coil that is present in metal detectors. Therefore, when a metallic object is placed close to the transmitter coil, it will produce an electric current in the object that will create another magnetic field on it. Receiver coil is another coil that can be seen in metal detectors, which can help identify magnetic field changes due to the presence of a metal object. The most advanced detectors use latest technologies, such as VLF, pulse induction and BFO beat-frequency oscillator.
Features of Metal Detectors:
The Detection Alert function is an important function. In less expensive VLF models, the detector emits an audio tone, and the tone changes as soon as the detector finds a metal target. Some detectors will not only tell you if they have detected a metal target, but they will also be able to let you know what type of metal target has been detected. This function is known as Target ID. There are some other functions as well, such as the Sensitivity function and Discrimination function.
What Are the Major Types of Metal Detectors?
Transmitter/Receiver is the earliest technology used in metal detectors, and it is based on Induction Balance principle. Modern detectors no longer use this technology.
BFO or Beat Frequency Oscillation is an older technology that is relatively cheap to make. These types of detectors were poor in detecting the differences between different types of metals.
VLF or Very Low Frequency detectors are the most common detectors and they are known for their excellent capability in distinguishing between various types of metals. They detect metals by determining phase shift within the returned signal from the object.
PI or Pulse Induction detectors send out an RF signal and wait for the returned signal. All of these devices are used in extremely mineralized coils, like seashores or salt water. The best thing about these types of detectors is the fact that they can detect extremely deep metal targets.
How to Find the Best Metal Detectors?
Probably, one of the most important factors to consider is how well the machine performs in the field. Find out how deep an object it will be able to detect. A comparison of a few major brands for a specific price range will show little difference in capability.
Some people will prefer certain specific brands or models. They will use the same brand for many years because they have had good results with them in the past. They make their choices based on their lengthy experiences with specific brands as well as their level of familiarity with certain machines. Each metal detector manufacturer utilizes its own circuit design, so the audible and visual response to targets may vary between different brands. This is a major factor to consider when buying these types of detectors. Some brands have unpleasant tones, and you can miss targets because of it.
When buying metal detectors, another important to consider would be to get one that feels good in your hands. One with a good balance allows you to swing it all day long without getting tired. The detectors of today have become quite advanced in this particular aspect. If you like using an older model, you can convert it into a hip mount configuration, so you won’t get tired while using it.
Make sure to find out about the complexity of the metal detector you are considering buying. If you like using a machine that is easy to operate, then you may not want something that has a lot of knobs, controls and programming. Majority of modern detectors are computer controlled, but they are designed so that even the new user can turn them on and off with ease. There could be some extra features which you may be able to use, as you acquire more practical experience and understanding. However, it is not wise to let this factor dictate your final decision-making process.
The kind of activities you will be doing with the metal detector is also an important aspect to consider. You may find that one brand is a better choice for finding old coins while another is more effective in searching for rings on the beach. Some manufacturers tend to target specific niches when it comes to designing their detectors. You may have to look for a different brand for each of your hunting expeditions.
When looking for the best metal detectors, the actual cost of the product is also of huge significance. It is like the saying that you get what you pay for. Purchasing top of the line detector could be all it takes to locate your favorite.
Thus, you ought to consider a number of different aspects when looking for these types of detectors. It all depends on your personal preferences and specific requirements. Make sure to ask your friends and family members about their experiences with different detectors. Chances are that they may be able to recommend a suitable detector that can meet your requirements. Therefore, you need to take all these steps, in order to buy the best quality product.