Liu W, Panjabi M M
Department of Orthopaedics & Rehabilitation, Yale University School of Medicine, New Haven, CT 06510, USA.
J Biomech. 1996 Oct;29(10):1383-5. doi: 10.1016/0021-9290(96)00019-x.
Calibration is important for improving the accuracy of instrumented spatial linkage (ISL) in the application of biomechanical studies. The assumption of the linear performance of the potentiometer transducer has limited the improvement of the linkage accuracy. We present a non-linear numerical calibration procedure and double potentiometer design to improve the accuracy of ISL. Through the use of a three-degree-of-freedom linkage, the non-linear calibration procedure and the double potentiometer design were shown to be effective in reducing the ISL errors. The error, i.e. standard deviation for the angle decreased from +/-0.38 degree to +/-0.12 degree while the same for the translation decreased from +/-0.41 to +/-0.16 mm. A high-accuracy linkage system using low-cost potentiometers could be constructed by using our calibration method and double potentiometer design.
在生物力学研究应用中，校准对于提高仪器化空间连杆机构（ISL）的精度至关重要。电位计传感器线性性能的假设限制了连杆机构精度的提高。我们提出了一种非线性数值校准程序和双电位计设计，以提高ISL的精度。通过使用三自由度连杆机构，结果表明非线性校准程序和双电位计设计在减少ISL误差方面是有效的。角度误差（即标准差）从±0.38度降至±0.12度，而平移误差则从±0.41毫米降至±0.16毫米。使用我们的校准方法和双电位计设计，可以构建一个使用低成本电位计的高精度连杆系统。
