一种高灵敏度磁性液体倾角传感器的研究

磁性液体独特的二阶悬浮力可以替代固体弹性元件为倾角传感器的惯性元件提供一个柔性弹性力，能够极大提高倾角传感器的抗冲击性能，已经在石油勘探行业成功应用。为进一步提高磁性液体倾角传感器的灵敏度，基于磁性液体的二阶悬浮特性提出了一种新的结构和检测方法，对传感器中两个永磁体间磁场的空间分布进行了理论计算和仿真，并通过试验对比分析了在选定不同参数条件下传感器的静态性能，最终得到当侧向间隙为3 mm,磁性液体注入量为1.4 g时，传感器量程为0°～50°,线性度误差为1.004 7%,灵敏度为2.3 mV/°,分辨率为0.023°,重复性误差为3.18%,工作性能最佳，且该传感器性价比高，壳体用材环保，具有很好的实用价值。

Study on a magnetic fluid inclination sensor with high sensitivity

Magnetic liquid can replace solid elastic element with its unique second-order suspension force to provide the inertial element of the dip sensor with a flexible elastic force, which can greatly improve the impact resistance of the dip sensor. It has been successfully applied in petroleum exploration industry. To improve the sensitivity of the magnetic liquid dip sensor, a new structure and detection method is proposed based on the second-order suspension characteristics of magnetic liquid. The spatial distribution of magnetic field between two permanent magnets is calculated by the theory, and the static performance of the sensor with different parameters is analyzed by experiment comparisons. Results show that when the lateral clearance is 3 mm and the amount of magnetic fluid is 1. 4 g, the measurement range is 0° ~ 50°, the linearity error is 1. 004 7% , the response rate is 2. 3 mV/ °, the resolving power is 0. 023°, the repeatability error is 3. 18% , and the working performance of the sensor is the best. In addition, the performance-price-ratio index of the sensor is high and the material of the housing is environmental, which makes it has a good practical application value.