The working principle of the magnetostrictive displacement sensor is based on the magnetostrictive effect, that is, the size of ferromagnetic materials will elongate or shorten under the action of an external magnetic field. After the external magnetic field is removed, it will return to its original length. Specifically, the sensor consists of a waveguide, a movable magnetic ring, and an electronic chamber. During the measurement, an excitation module in the electronics chamber generates a current pulse, which is transmitted within the waveguide, thereby generating a circular magnetic field outside the waveguide. When the magnetic field intersects with the magnetic field generated by the movable magnetic ring on the waveguide, a strain mechanical wave pulse signal will be generated in the waveguide due to the magnetostrictive effect. This strain mechanical wave pulse signal is transmitted at a fixed speed of sound and is quickly detected by the electronic chamber. Since the transmission time of the strain mechanical wave pulse signal in the waveguide is proportional to the distance between the movable magnetic ring and the electronic chamber, this distance can be determined by measuring the time, thereby achieving high-precision displacement measurement.
The above are the detailed steps of the working principle of the magnetostrictive displacement sensor:
1. The excitation module in the electronic chamber generates a current pulse, which is transmitted in the waveguide to generate a circumferential magnetic field.
2. The magnetic field generated by the movable magnetic ring intersects with the circular magnetic field, triggering the magnetostrictive effect and generating a strain mechanical wave pulse signal.
3. The strain mechanical wave pulse signal propagates at a fixed sound speed and is detected by the electronic chamber.
4. By measuring the time difference combined with the wave speed, the position of the movable magnetic ring is accurately calculated and the displacement of the measured object is determined.
Based on the characteristics of high precision, high reliability, long life and maintenance-free, magnetostrictive displacement sensors are suitable for various harsh environments and complex application scenarios.
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