Wang Man, Shi Haotian, Zhang Hongpeng, Huo Dian, Xie Yucai, Su Jun
Marine Engineering College, Dalian Maritime University, Dalian 116026, China.
Micromachines (Basel). 2020 Dec 15;11(12):1108. doi: 10.3390/mi11121108.
The inductive debris sensor has been studied because of its wide application prospects in mechanical health monitoring. In order to ensure a high-precision detection performance, a comprehensive method to improve the detection sensitivity and detection ability of the inductive sensor for non-ferromagnetic metal debris is proposed. Based on the characteristics of the eddy current inside the metal, the change of the coil impedance caused by the metal debris is increased by enhancing the magnetic field strength and selecting the optimal excitation frequency. The impedance detection method involving inductance and resistance parameters is used to improve the detection limit of non-ferromagnetic metal debris. The experimental results verify that the magnetic field in the detection region can be enhanced by adding a silicon steel strip (paramagnetic material) in the central hole of the coil, thereby greatly improving the detection sensitivity of the inductive sensor, and the concentrated distribution of the magnetic field avoids the double-peak signals generated by a single particle. The characteristics of the signal amplitude of non-ferromagnetic debris with excitation frequency are studied. Higher inductance, resistance amplitudes, and signal-to-noise ratio (SNR) can be obtained by using a high-frequency alternating current. Compared with inductance parameter detection, resistance parameter detection can detect smaller non-ferromagnetic debris. Combining the detection results of the inductance and resistance parameters can effectively improve the sensor's ability to detect non-ferromagnetic debris.
由于感应式碎片传感器在机械健康监测中具有广阔的应用前景，因此对其展开了研究。为确保高精度检测性能，提出了一种提高感应式传感器对非铁磁性金属碎片检测灵敏度和检测能力的综合方法。基于金属内部涡流的特性，通过增强磁场强度和选择最佳激励频率，增大金属碎片引起的线圈阻抗变化。采用涉及电感和电阻参数的阻抗检测方法，提高非铁磁性金属碎片的检测极限。实验结果表明，在线圈中心孔中添加硅钢片（顺磁性材料）可增强检测区域的磁场，从而大大提高感应式传感器的检测灵敏度，且磁场的集中分布避免了单个颗粒产生的双峰信号。研究了非铁磁性碎片信号幅度随激励频率的特性。使用高频交流电可获得更高的电感、电阻幅度和信噪比（SNR）。与电感参数检测相比，电阻参数检测能检测到更小的非铁磁性碎片。结合电感和电阻参数的检测结果可有效提高传感器检测非铁磁性碎片的能力。
