Displacement sensor, also known as linear sensor, is a linear device belonging to metal induction. The function of the sensor is to convert various measured physical quantities into electricity. In the production process, the measurement of displacement is generally divided into two types: physical size measurement and mechanical displacement. According to the form of the measured variable transformation, the displacement sensor can be divided into analog and digital. The analog type can be divided into two types: physical type and structural type. Commonly used displacement sensors are mostly analog type structures, including potentiometer displacement sensors, inductive displacement sensors, self-aligning machines, capacitive displacement sensors, eddy current displacement sensors, and Hall-type displacement sensors. An important advantage of digital displacement sensors is the ease with which signals can be sent directly to a computer system. Such sensors are rapidly evolving and are becoming more widely used.
Since there is no direct contact between the active magnetic ring and the sensitive component as the determined position,
Therefore, the sensor can be used in extremely harsh industrial environments, and is not susceptible to oil, solution, dust or other pollution. The IP protection rating is 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 an absolute displacement value. Even if the power is interrupted or reconnected, the data will not be lost, and there is no need to reset to zero. Since the sensitive components are non-contact, even if the detection is repeated, the sensor will not be worn any more, which can greatly improve the reliability and service life of the test.
The magnetostrictive displacement sensor uses the principle of magnetostriction to accurately measure the position by generating a strain pulse signal by the intersection of two different magnetic fields. The measuring element is a waveguide, and the sensitive elements in the waveguide are made of a special magnetostrictive material. The measurement process is a pulse of current generated by the sensor's electronics chamber, which is transmitted within the waveguide to create a circumferential magnetic field outside the waveguide that intersects the magnetic field generated by the moving magnetic ring that is placed over the waveguide as a positional change. At the time of the magnetostriction, a strain mechanical wave pulse signal is generated in the waveguide, and the strained mechanical wave pulse signal is transmitted at a fixed sound speed and is quickly detected by the electronic chamber.