MP201802

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Magnetic sensors, such as those found in MP201802 modules, use different principles to detect magnetic fields. These principles offer distinct advantages in many different application fields.

Magnetoresistive Principle

Magnetoresistive sensors, also known as Hall-effect sensors, use principle of the resistance to a magnetic field variation of certain metals such as iron, cobalt, nickel, or permalloy. When a magnet passes near such a device, the varying field causes a change in the resistance of the metal, which is interpreted as a signal by an integrated circuit. As compared to the anisotropic magnetoresistive (AMR) technique, the magnetoresistive technique offers increased performance and stability over temperature variations.

Thermoelectric Principle

The thermoelectric principle is similar to the magnetoresistive principle, but instead of using the resistance of the metal, it utilizes the Seebeck effect. The Seebeck effect is the phenomenon that occurs when two different metals are exposed to a temperature gradient, resulting in a voltage differential between the two surfaces. In magnetic sensors, a tiny thermopile is placed on the bottom of the module, and when a magnetic field passes through it, the thermopile produces a voltage that varies according to the strength of the field.

Inductive Principle

Inductive sensors rely on Faraday’s law, which states that a voltage is induced into a circuit when it passes through a magnetic field. In inductive sensors, a coil is placed in the magnetic field, and when the field changes, a voltage is induced in the coil proportional to the change in the field. Inductive sensors are very sensitive and can detect even the smallest of changes in the field.

Uses for Magnetic Sensors

The primary application for magnetic sensors is in proximity sensing. Proximity sensors are used to detect the presence of an object at a certain distance and can be used in a wide variety of applications. They are commonly used in robotics and automation to detect the presence of objects and can be used in safety systems to detect the presence of personnel. Magnetic sensors can also be used in position sensing applications, such as flight control systems, and in speed sensing applications, such as drivetrain control systems.

Conclusion

Magnetic sensors, such as those found in the MP201802 modules, offer a unique set of advantages for a variety of applications due to their sensitivity and quick response. With the ability to detect changes in magnetic fields, these sensors are useful in proximity, position, and speed sensing applications. With their ability to work over a wide range of temperatures, they are a reliable and robust solution for many industrial and automotive applications.

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