When it comes to metal detectors there are three types of options to pick from. It’s important to know the three different types before investing in a purchase. Picking the right type based on your budget and goals is the key to a successful journey in the sport of treasure hunting. Below is an overview of the different types of metal detectors you can find.
Very Low Frequency Detectors (VLF)
These types of detectors are most commonly used because they have so many different uses due to its high end technology. It features two round coils of wire called a transmitter and receiver. The transmitter is used to emit a low frequency magnetic field onto the surface or ground used for treasure hunting, while the receiver is used for its magnetic reflections from a treasure or object found in the ground. Once a signal reflection happens a tone will be able to be heard. In addition, this type of detector includes an electric circuit, also known as a tuner, which serves the purpose of filtering signals to the detector’s receiver. If you are looking to focus on treasures such as gold and silver you can tune out signals such as aluminum and steel which helps you determine what you are searching for.
Pulse Induction Detectors (PI)
Pulse induction metal detectors are specially used for searching deep under a surface for a treasure. The bigger sizes are also known for being used at checkpoints that require security for weapon detection. Only one coil is used which has a sole purpose of sending a magnetic field into the surface or ground. When there is metal under the surface it will reflect a signal which you can listen for. This type of detector switches modes to help a user listen for the reflected signal found and can discriminate between signs sent and random outside signals from its surroundings. In addition, these detectors tend to be more accurate which falls on the more expensive side when purchasing.
Beat Frequency Oscillation Detectors (BFO)
The beat frequency oscillation detector is the simplest detector with a design that is known to be inexpensive. Many say if you are just starting out in the sport of treasure hunting to go with this type of detector. The BFO has two wire coils that are separate and used for detection when treasure hunting. An oscillator creates a signal that is constant with a set frequency. This signal then gets omitted from one of the two coils. The responsibility of the other coil is to detect interference of the frequency that found metal objects can cause. The coil will notify the user by a change in audio sound or tone signaling a result. This detector has some similarities to the very low frequency model, but is more prone to mistakes that have trouble deciphering treasure from junk.