In the ferromagnetic material in the direction of magnetization can cause the change of medium lattice spacing change, which makes the ferromagnetic length and volume change, namely: magnetostrictive phenomenon, also known as the Wiedemann effect, the reverse effect is called the Villari effect.

The principle of magnetostrictive sensor is to use two different magnetic fields to produce a strain pulse signal, and then calculate the signal to be detected by the time period, thereby converting the exact location. The two one from the magnetic field of permanent magnet excitation pulse generating another from the sensor electronic warehouse in electronic components. The exciting pulse is made of a magnetostrictive material made of a magnetostrictive material. When the intersection of permanent magnetic field and the magnetic ring, due to the magnetostrictive phenomenon, mechanical vibration generated by the waveguide wire to form a strain pulse. The strain pulse is quickly detected by the sensing circuit in the electronic cabin. From the moment of the excitation pulse to the strain pulse, the total time multiplied by the fixed sound velocity can be calculated accurately. This process is continuous, so when the position of the magnetic loop is changed, the new location will be rapidly measured. Since the output signal is the true absolute value, rather than the proportion of the signal or the need to re amplify the signal, so there is no signal drift or change the value of the situation, but also do not have to wait for other sensors, such as the need for periodic calibration.

Magnetostrictive sensor for non-contact, never wear. It has the advantages of high resolution, high precision, high stability, high reliability, fast response time, long service life and so on. Sensors do not have to be re calibrated, do not have regular maintenance. Milang series magnetostrictive displacement sensor series, optional model diversification, the surface of the anode casing treatment; corrosion protection; import embedded waveguide wire by DSP as measurement unit, digital signal processing, high precision, no temperature drift; the internal components and the main measurement of the measured medium without contact, long service life. Therefore, great magnetostrictive displacement sensor is widely used in medical equipment industry, and gradually replace the resistance type displacement sensor, small rope type displacement sensor and the import of magnetostrictive displacement sensor. Miran magnetostrictive displacement sensor is widely used in the field of medical devices.