Kolen P T, Rhode J P, Francis P R
Electrical and Computer Engineering Department, San Diego State University, CA 92182.
J Biomech. 1993 Mar;26(3):265-70. doi: 10.1016/0021-9290(93)90364-k.
A miniaturized absolute angle sensor utilizing Hall generators referenced to the Earth's ambient magnetic field has been developed. The sensor has three-dimensional angular sensitivity which allows the output to be self-normalized resulting in high immunity to both B-field and temperature induced errors. The individual Hall generator elements were operated with a final sensitivity of 4.07 V G-1. The Earth's field, magnitude 0.486 G with a surface declination angle of 58.2 degrees (San Diego, California), was used as the excitation/reference field. Bandwidth limiting, low-noise design, and active/passive thermal compensation techniques were employed resulting in a sensor bandwidth of DC to 100 Hz with a maximum signal-to-noise ratio of 44.5 dB. The maximum angular resolution of the sensor was measured to be +/- 0.27 degrees. Temperature induced error was measured to be less than 2% from 25 degrees C to 40 degrees C. The measurement of shoulder joint rotation was used as the test case application for the sensor with excellent agreement between theoretical and experimental performance.
一种利用霍尔发生器并以地球环境磁场为参考的小型化绝对角度传感器已被研发出来。该传感器具有三维角灵敏度，能使输出实现自归一化，从而对磁场和温度引起的误差具有高度免疫力。各个霍尔发生器元件的最终灵敏度为4.07 V G⁻¹。地球磁场强度为0.486 G，在加利福尼亚州圣地亚哥的地表磁偏角为58.2度，被用作激励/参考场。采用了带宽限制、低噪声设计以及主动/被动热补偿技术，使得传感器带宽为直流至100 Hz，最大信噪比为44.5 dB。经测量，该传感器的最大角分辨率为±0.27度。在25摄氏度至40摄氏度范围内，温度引起的误差经测量小于2%。肩关节旋转测量被用作该传感器的测试案例应用，理论性能与实验性能之间具有出色的一致性。
