A Basic Guide To Magnetic Sensors

Magnetic sensors are a form of solid state device, capable of converting the magnitude of a magnetic field into an electrical signal that can be processed by electrical circuits. Magnetic sensors trace back to their invention a few decades ago, and while they originally acted as sensors that utilize the electromagnetic induction effect, they have since expanded to cover the galvano-magnetic effect, the Josephson effect, the magneto-resistance effect, and much more. In this blog, we will offer a brief overview of magnetic sensors and their various types, allowing you to have a better understanding of how they can be used.

Across all types, magnetic sensors are capable of transforming magnetic information into readable electrical signals, allowing the device to determine speed, rotation, distance, angle, and position. With this capability, magnetic sensors are primarily relied on to determine the strength of a magnetic field and geomagnetism. With their basic set of operations and compatibility with electrical circuits, such sensors have become a staple of various applications. Furthermore, their tolerance to vibration, water, and dust is also an added benefit that makes them popular. 

The working principle of a magnetic sensor is based on the type of sensor element that is present in the device. Generally, when an iron component is placed near the coil or wire that is wound around a permanent magnet, the magnetic flux exhibited within the coil will adjust. This results in a voltage being generated at the coil’s terminals. By combining the coil with others, a highly sensitive magnetic sensor can be established. While the coils themselves are not able to directly measure a magnetic field, they are able to detect any change or vibration occurring within the magnetic field. By drawing the magnet closer to the coil, the magnetic flux density will increase, resulting in opposite forces in the form of induced current and electromotive force. Once the coil ceases movement, the adjustment of the magnetic flux density, EMF, and current will all stop. By observing the induced EMF and current, one can find the ratio of density and direction changes.

While these are the basic functions of a magnetic sensor, there are a number of types that one may procure, each of which utilize varying components to perform different jobs. For example, Hall effect magnetic sensors are used to convert the stored energy of a magnetic field into an electrical signal, while fluxgate or coiled types measure magnetic field differences at vertical rod ends. Whether one is trying to perform certain types of readings, whether for field research, medical processes, etc., it is crucial that the right type of magnetic circuit is procured.

There are various advantages to using a magnetic sensor over other options, those of which include their easy maintenance, compact and robust design, easy operations, and more. Despite this, they are generally not able to measure the flow of a current that has a distance greater than 10cm, and their sensing capability is often affected by high temperatures. Nevertheless, they are still depended on for military applications, robotics, agriculture, industrial processes, consumer electronics, green energy power plants, and so much more.

If you are in the market for top-quality magnetic sensor components for your operations, look no further than ASAP Aviation Unlimited. On our database, we offer customers access to over 2 billion new, used, obsolete, and hard-to-find parts that have been sourced from top manufacturers from across the globe. With our AS9120B, ISO 9001:2015, and FAA AC 00-56B accreditation, we ensure the quality and caliber of every part we offer, and countless items have undergone various tests and inspections prior to shipment. If you are ready to begin, fill out and submit an RFQ form as provided on our website for items of interest, and a member of our staff will reach out to you in 15 minutes or less to continue the purchasing process.


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