Magnetostrictive linear displacement sensors operate based on a unique physical principle. When activated, the sensor's electronic compartment generates an initial pulse that travels along a waveguide wire. As this pulse moves through the wire, it creates a rotating magnetic field that propagates in the same direction as the waveguide. This magnetic field interacts with the permanent magnet located in a floating magnet or a magnetic ring attached to the object being measured. The interaction between these two magnetic fields triggers a magnetostrictive effect, causing the waveguide to twist slightly.
This twisting is detected by a pickup coil located within the electronic compartment. The mechanical deformation is converted into an electrical signal, which is then processed by the internal circuitry. By measuring the time difference between the initial pulse and the return pulse caused by the twisting, the sensor can accurately determine the position of the magnet, and thus the displacement or liquid level. These sensors are ideal for applications where high accuracy and reliability are essential, especially in challenging environments such as industrial settings or outdoor installations.
The magnetostrictive sensor offers several advantages over other types of displacement and level measurement devices. It provides high precision, excellent repeatability, and long-term stability. Its non-contact operation ensures a longer lifespan and reduces wear and tear. Additionally, it is easy to install and highly adaptable to various environmental conditions. Unlike some other sensors, it outputs a true absolute position signal, not a proportional or amplified one. This means there is no signal drift, and no need for periodic recalibration or re-zeroing, even after power interruptions.
Furthermore, because the output is an absolute value, the sensor retains its position information even when the power is turned off, making it highly reliable for continuous monitoring. Compared to traditional level gauges or transmitters, magnetostrictive sensors offer superior performance in terms of accuracy and durability. They are widely used across industries such as oil and gas, chemical processing, pharmaceuticals, food and beverage, and more, for measuring and controlling liquid levels in storage tanks and vessels.
In addition to liquid level measurement, these sensors can also be used as linear displacement sensors, providing precise measurements of moving objects. Some models even offer analog output signals that represent the speed of the moving object, adding versatility to their applications. Whether used for level sensing or motion tracking, magnetostrictive sensors are a reliable and efficient choice for modern industrial automation systems.
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**Tag:** Magnetostrictive Displacement Sensor, Working Principle, Waveguide, Moving Object
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