磁致伸缩位移传感器双磁环间测量盲区的影响分析

为减小双磁环磁致伸缩位移传感器磁环间的测量盲区,对传感器在测量盲区内的输出信号进行了分析。从双磁环偏置磁场与磁环间距的关系进行研究,建立了双磁环磁致伸缩位移传感器的输出电压模型,计算了不同偏置磁场强度的双磁环在不同间距与放置方向时传感器的输出电压,并通过实验进行了验证。结果表明,磁环规格相同时,测量盲区的大小与磁环放置方向无关,磁环偏置磁场强度越小,磁环间的测量盲区越小,磁场叠加影响的电压幅值变化量也越小。且在传感器的测量盲区内,电压输出信号将会受到偏置磁场与电压输出波形叠加的影响,这两种因素都会导致传感器检测失效。该研究结果为多磁环位移传感器磁环的选型及减小传感器磁环间的测量盲区提供理论基础。

Analysis of the Influence of the Measurement Blind Area between Two Magnetic Rings of Magnetostrictive Displacement Sensor

In order to reduce the measurement blind area between the two magnetostrictive displacement sensors,the output signal of the sensor in the measurement blind area is analyzed. In this paper,the relationship between the biasing magnetic field and the distance between two magnetic rings is studied,the output voltage model of the biasing magnetostrictive displacement sensor is established,and the output voltage of three groups of biasing magnetic field with different intensity of biasing magnetic rings in different distance and placement direction is calculated,which is verified by experiments. The results show that the size of the measurement blind area is independent of the placement direction of the magnetic ring when the specifications of the magnetic ring are the same. The smaller the bias magnetic field intensity of the magnetic ring,the smaller the measurement blind area between the magnetic rings,and the smaller the variation of the voltage amplitude affected by the magnetic field superposition.In the blind area of the sensor,the voltage output signal will be affected by the superposition of bias magnetic field and voltage output waveform,both of which will lead to the sensor detection failure. The results provide a theoretical basis for the selection of the magnetic ring and the reduction of the measurement blind area between the magnetic rings.