Magnetometers

What is a Magnetometer

A magnetometer is a device that examines the external magnetic field of the earth. In doing so, it provides you with information as to the location of different objects that are located below ground. Further details on how this device works is provided below.

This device is best used for the location of either ferrous metals or steel. However, if you plan on focusing more on gold or other non-ferrous metals, then a magnetometer won’t be the correct solution.

Different types of magnetometers also exist. Some models are primarily for use on dry land while others can be used on water as well as hand-held versions for divers. In addition, models such as the JW Fisher PT-1 can be used both on dry land as well as salt water although its main focus is on locating pipes and then tracking its line.

How Does a Magnetometer Work

A magnetometer works by using some basic physics which lie at the heart of magnetometry. The magnetometer sensor is capable of picking up the natural magnetic properties that come from not only the earth itself but also the way in which those properties are influenced by objects in the ground. 

The magnetometer itself is moved slowly over the area. A signal is sent with the magnetic force then being recorded. A magnetometer will then pick up an anomaly due to the expected response from the natural magnetic field in the earth. These changes will then provide the user with a better understanding of what could potentially be below ground.

The accuracy of this type of detector does depend on the quality of its magnetic field sensor. Those models at the lower end of the market may not be as sensitive to changes in the geomagnetic field.

Magnetometers can use different types of technology to deliver results. A common version is the fluxgate magnetometer which uses two coils that are highly sensitive to the magnetic force of the earth. In order to better understand the sensitivity, then you need to look at the nanotesla level that comes with the model in question.

Also, a magnetometer is calibrated by the use of an electric current. This current completes a circuit that then allows for magnetometer measurements to be taken. In other words, the magnetometer sensor is often the key to the quality of the magnetometer. If you have any questions regarding this aspect, then contacting our team of experts before purchase is essential.

What is a Magnetometer Used For

A magnetometer can be used in a number of settings. They are popular on archaeological sites to uncover features or relics below ground. Also, they can be used to locate iron ore deposits, pipelines and other items that may potentially cause problems when a site is being developed. 

Marine magnetometers also exist with their primary focus on the discovery of shipwrecks. This device is towed along behind a boat with the magnetometer using geophysics by measuring the magnetic field strength and its variations should it encounter anything on the seabed. With this version, being aware of more than the magnetometer sensor is important as being capable of using video or sound to improve the quality of the survey could also be vital.

The best magnetometers will be capable of dealing with all of these options as the key is the way in which they carry out those magnetic field measurements. 

What are the Best Magnetometers

The best magnetometers are going to depend on the exact reasons for you wanting to use one. When looking at purchasing a magnetometer metal detector, you also want to be aware of the depth at which it can work. A magnetometer is capable of picking up changes in the earth’s field to a greater depth than a simple metal detector. It is not uncommon for this depth to be around 200 feet while the detection range on the surface can be in the region of 6ft.

In addition, the best magnetometer may also be a model such as the OKM exp 4500 which combines a metal detector and magnetometer. This eliminates the problem of a basic magnetometer only being used to locate ferrous metals. Its flexibility allows it to be used in a variety of situations giving you an all-in-one solution. 

Also, if you are relatively new to using this type of equipment, then do consider models that provide instant, and clear, magnetometer data. You want fast magnetic measurements to be taken and that information to then be presented to you without a delay. As a result, surveys can be completed in an instant.

So, if you are considering purchasing a magnetometer then you want to be sure that you get the correct one for your needs. Our team of experts at Kellyco are on hand to help answer any questions you may have. Simply contact our customer care department and we will be more than happy to help.