Magnetostrictive displacement measurement systems

With magnetostrictive position measurement systems, we ensure precision and reliability even under the most challenging conditions. These sensors operate without physical contact and guarantee a long service life with no maintenance required. Thanks to the magnetostrictive effect, they measure positions with high accuracy and are therefore particularly well-suited for environments that demand high loads and continuous monitoring.

Magnetostriction refers to the elastic deformation of ferromagnetic materials in a magnetic field and forms the basis of this sensor technology. The measuring system consists of a ferromagnetic waveguide housed within the enclosure and an external Position marker a permanent magnet. At the start of each measurement, a current pulse generates a ring-shaped magnetic field in the waveguide, which interacts with the magnetic field of the position marker and thereby excites a torsional mechanical wave at the magnet’s current position. This wave travels back to the sensor head at ultrasonic speed and is detected there; the time between the current pulse and the wave’s arrival is proportional to the position. The electronics convert the measured transit time into an absolute position signal. The method is non-contact, wear-free, and offers extremely good repeatability.

In addition to their structural robustness, these sensors offer excellent linearity and accuracy, which are critical in applications where even the slightest deviation can have a significant impact on the process. Their wide range of applications extends from heavy industries such as metal processing to demanding applications in the renewable energy sector, where they contribute to increased efficiency and performance optimization. Their adaptability allows them to be used effectively in both new installations and existing systems, providing a cost-effective method for optimizing manufacturing productivity.

Key advantages of magnetostrictive sensors

• Highest precision: Non-contact measurement for long-lasting accuracy without wear.
• Durability: Tightly sealed to protect against water, dirt, and chemical exposure. Excellent protection against electromagnetic interference and fewer operational interruptions.
• Long measurement ranges: Measurement ranges of up to several meters are possible without any loss of accuracy.

Typical applications for magnetostrictive sensors

• Hydraulic systems: Optimized position monitoring in high-load hydraulic cylinders enhances safety and efficiency in the control of machine movements.
• Industrial environments: Particularly well-suited for use in metalworking and heavy industry, thanks to their ability to withstand the harshest operating conditions. They are also an excellent choice for wind turbines, where they help improve operational efficiency and safety by precisely measuring and monitoring blade position.