The working principle of magnetostrictive displacement sensor ！

The magnetostrictive displacement sensor accurately detects the absolute position of the active magnetic ring by means of a non-contact measurement and control technique to measure the actual displacement value of the detected product. The high precision and high reliability of the sensor have been widely used in thousands Of the actual case.
Since there is no direct contact with the active magnetic ring encoder and the sensing element as the determined position,
 Displacement sensor (Figure 3) The sensor can therefore be used in extremely harsh industrial environments, less susceptible to oil, solution, dust or other pollution, IP protection above IP67. In addition, the sensor uses high-tech materials and advanced electronic processing technology, so it can be used in high temperature, high pressure and high oscillation environment. The sensor output signal is the absolute displacement value, even if the power is interrupted, re-connected, the data will not be lost, but no need to re-zero. As the sensitive components are non-contact, even if repeated testing, it will not cause any wear on the sensor, can greatly improve the reliability and service life.
Magnetostrictive displacement sensor, is the use of magnetostrictive principle, through two different magnetic field intersection to produce a strain pulse signal to accurately measure the location. The measuring element is a waveguide, and the sensing element in the waveguide is made of a special magnetostrictive material. The measurement process is a current pulse generated in the electronic chamber of the sensor which is transmitted in the waveguide to produce a circumferential magnetic field outside the waveguide when the magnetic field intersects the magnetic field generated by the active magnetic ring as a position change on the waveguide , Due to the role of magnetostriction, the waveguide will produce a strain mechanical wave pulse signal, the strain mechanical wave pulse signal to a fixed sound speed transmission, and was quickly detected by the electronic room.
Since the transmission time of the strain mechanical wave pulse signal in the waveguide and the distance between the movable magnetic ring and the electronic chamber are proportional,
 Displacement sensor (Figure 4) by measuring the time, you can accurately determine the distance. Since the output signal is a true absolute value, not a proportional or amplified signal, there is no signal drift or variable value, and there is no need for periodic re-marking.
Magnetostrictive displacement sensor is based on the principle of magnetostrictive manufacturing of high precision, long stroke absolute position measurement of the displacement sensor. It uses non-contact measurement method, because the measurement of the active magnetic ring and the sensor itself is not directly contact, and will not be friction, wear, and thus its long life, environmental adaptability, high reliability, System automation work, even in harsh industrial environments, but also work properly. In addition, it can withstand high temperature, high pressure and strong vibration, has been widely used in mechanical displacement measurement, control. [1]

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