Principle of magnetostrictive displacement sensor
The measuring element of the magnetostrictive displacement sensor is a wave guide, and the sensitive element in the wave guide is made of special magnetostrictive material. The measurement process is that a current pulse is generated in the electronic chamber of the sensor. The current pulse is transmitted in the waveguide, thereby generating a circular magnetic field outside the waveguide. When the magnetic field intersects the magnetic field generated by the movable magnetic ring sheathed on the waveguide as a position change At this time, due to the action of magnetostriction, a strained mechanical wave pulse signal is generated in the waveguide. This strained mechanical wave pulse signal is transmitted at a fixed sound speed and is quickly detected by the electronic room.
Since the transmission time of this strain mechanical wave pulse signal in the waveguide is proportional to the distance between the active magnetic ring and the electronic room, this distance can be determined with high accuracy by measuring the time. Since the output signal is a true absolute value, not a proportional or amplified signal, there is no signal drift or change in value, and there is no need for regular re-calibration.
Magnetostrictive displacement sensor is a high-precision, long-stroke absolute position measurement displacement sensor manufactured according to the principle of magnetostriction. It uses a non-contact measurement method. Because the movable magnetic ring used for measurement does not directly contact the sensor itself, it will not be rubbed or worn. Therefore, it has a long service life, strong environmental adaptability, high reliability, good safety, and convenience. The system is automated and can work normally even in harsh industrial environments. In addition, it can withstand high temperature, high pressure and strong vibration, and has been widely used in the measurement and control of mechanical displacement.
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