An ultra-thin flexible eddy current proximity sensor array was developed for online measurements of tiny gaps between large smooth metallic and nonmetallic surfaces of arbitrary shapes. The probe of the flexible eddy ...An ultra-thin flexible eddy current proximity sensor array was developed for online measurements of tiny gaps between large smooth metallic and nonmetallic surfaces of arbitrary shapes. The probe of the flexible eddy current sensor array, which includes a set of sensor coils, is fabricated on a thin flexible substrate using the flexible printed circuit board process which allows the probe to be very thin and flexible so that it can conform to the surface geometry of the measured objects. The sensor coils are connected to an inductance-capacitance oscillator, which converts the distance between the sensor coil and the metallic target to a frequency output. Experimental results show that the measurement accuracy of the sensor system can reach ±0.5% for a 2-mm gap and the sensor system is suitable for online gap measurements.展开更多
平面柔性涡流传感器能同时独立测量电导率和提离,在应力评估、缺陷检测方面具有较大优势。文中采用有限元法仿真分析了工作频率对平面柔性涡流传感器性能的影响,在工作频率为500 k Hz时,使用所设计的平面柔性涡流传感器对铝合金3A21进...平面柔性涡流传感器能同时独立测量电导率和提离,在应力评估、缺陷检测方面具有较大优势。文中采用有限元法仿真分析了工作频率对平面柔性涡流传感器性能的影响,在工作频率为500 k Hz时,使用所设计的平面柔性涡流传感器对铝合金3A21进行了拉伸应力试验,得到铝合金电导率与拉伸应力的关系。实验结果表明,在合适的工作频率激励下,平面柔性涡流传感器能有效实现导电材料的电导率测量和应力大小的评估。展开更多
文摘An ultra-thin flexible eddy current proximity sensor array was developed for online measurements of tiny gaps between large smooth metallic and nonmetallic surfaces of arbitrary shapes. The probe of the flexible eddy current sensor array, which includes a set of sensor coils, is fabricated on a thin flexible substrate using the flexible printed circuit board process which allows the probe to be very thin and flexible so that it can conform to the surface geometry of the measured objects. The sensor coils are connected to an inductance-capacitance oscillator, which converts the distance between the sensor coil and the metallic target to a frequency output. Experimental results show that the measurement accuracy of the sensor system can reach ±0.5% for a 2-mm gap and the sensor system is suitable for online gap measurements.
文摘平面柔性涡流传感器能同时独立测量电导率和提离,在应力评估、缺陷检测方面具有较大优势。文中采用有限元法仿真分析了工作频率对平面柔性涡流传感器性能的影响,在工作频率为500 k Hz时,使用所设计的平面柔性涡流传感器对铝合金3A21进行了拉伸应力试验,得到铝合金电导率与拉伸应力的关系。实验结果表明,在合适的工作频率激励下,平面柔性涡流传感器能有效实现导电材料的电导率测量和应力大小的评估。
