Leung Chung Ming, Or Siu Wing, Ho S L
Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Rev Sci Instrum. 2013 Dec;84(12):125003. doi: 10.1063/1.4838615.
A force sensing device capable of sensing dc (or static) compressive forces is developed based on a NAS106N stainless steel compressive spring, a sintered NdFeB permanent magnet, and a coil-wound Tb(0.3)Dy(0.7)Fe(1.92)/Pb(Zr, Ti)O3 magnetostrictive∕piezoelectric laminate. The dc compressive force sensing in the device is evaluated theoretically and experimentally and is found to originate from a unique force-induced, position-dependent, current-driven dc magnetoelectric effect. The sensitivity of the device can be increased by increasing the spring constant of the compressive spring, the size of the permanent magnet, and/or the driving current for the coil-wound laminate. Devices of low-force (20 N) and high-force (200 N) types, showing high output voltages of 262 and 128 mV peak, respectively, are demonstrated at a low driving current of 100 mA peak by using different combinations of compressive spring and permanent magnet.
基于NAS106N不锈钢压缩弹簧、烧结钕铁硼永磁体和绕线式Tb(0.3)Dy(0.7)Fe(1.92)/Pb(Zr, Ti)O3磁致伸缩∕压电层压板，开发了一种能够感应直流（或静态）压缩力的力传感装置。对该装置中的直流压缩力传感进行了理论和实验评估，发现其源于一种独特的力致、位置相关、电流驱动的直流磁电效应。通过增加压缩弹簧的弹簧常数、永磁体的尺寸和/或绕线式层压板的驱动电流，可以提高该装置的灵敏度。通过使用压缩弹簧和永磁体的不同组合，在100 mA峰值的低驱动电流下，展示了低力（20 N）和高力（200 N）类型的装置，其峰值输出电压分别高达262和128 mV。
