Principle and characteristics:

The magnetostrictive linear displacement sensor (also referred to as magnetostrictive ruler for short) is mainly composed of a magnetostrictive wire (hereinafter referred to as waveguide wire), a measuring rod, an electronic compartment and a non-contact permanent magnetic ring or float sleeved on the measuring rod. The structure is shown in Figure 1. When the sensor is working, the electronic circuit in the electronic compartment generates a "start pulse". This start pulse is transmitted along the waveguide wire at a constant speed. At the same time, a rotating magnetic field following the pulse along the waveguide wire is generated. When this magnetic field meets the permanent magnetic field of the float, the magnetostrictive effect is produced, causing the waveguide wire to twist. This twist is sensed by the energy pickup mechanism installed in the electronic compartment and converted into the corresponding "termination pulse". By calculating the time difference t1, t2, and t3 between the "start pulse" and the corresponding "termination pulse", the displacement can be accurately measured, and then the accurate displacement value can be obtained. The waveform is shown in Figure 2.

The magnetostrictive displacement sensor for absolute position measurement manufactured by using this principle has excellent performance, long service life, good environmental adaptability, reliability, and can work effectively and stably. It can not only measure the linear displacement of a moving object, but also give analog signals or liquid level signals of the position and speed of the moving object. According to different output signals, it is divided into analog and digital types. The flexible power supply mode and extremely convenient multiple wiring methods and multiple output forms can meet various measurement, control, and detection requirements. Since the non-contact measurement method is adopted, friction or wear caused by mutual contact of components is avoided. Therefore, it is very suitable for system engineering or occasions with harsh environments and no regular maintenance. Compared with products such as conductive rubber displacement sensors, magnetic grid displacement sensors, and resistive displacement sensors, it has obvious advantages in all aspects of performance. Moreover, it is convenient for installation and debugging, coupled with an extremely high performance-price ratio; timely and thoughtful after-sales service is enough to make users use it more放心ly.