Zhu H S, Maalej N, Webster J G, Tompkins W J, Bach-y-Rita P, Wertsch J J
Department of Electrical and Computer Engineering, University of Wisconsin, Madison 53706.
IEEE Trans Biomed Eng. 1990 Sep;37(9):908-11. doi: 10.1109/10.58601.
We have developed an umbilical data-acquisition system for measuring pressures between the foot and shoe during walking. It consists of pressure sensors in the insoles of shoes, amplifier circuits, umbilical cables, an analog-to-digital converter, and a graphics display card in an IBM PC for real-time data collection and display. The applied pressure on a sensor decreases its resistance, which causes the output voltage of the amplifier circuit to increase. We attach seven sensors to the surface of each insole of a pair of extra-depth shoes and calibrate all the sensors in the insole before and after each test using a load cell as a reference. The IBM PC samples the outputs from the sensor and the load cell and stores a piecewise linear lookup table for use in compensation for the nonlinearity of the sensor. On the PC's graphics display, two programs provide displays of foot pressures as real-time bar graphs or as analog pressure versus time curves.
我们开发了一种用于测量行走过程中足部与鞋子之间压力的脐部数据采集系统。它由鞋内底的压力传感器、放大电路、脐部电缆、模数转换器以及IBM个人计算机中的图形显示卡组成，用于实时数据采集和显示。施加在传感器上的压力会降低其电阻，从而导致放大电路的输出电压升高。我们在一双深度加大的鞋子的每个内底表面附着七个传感器，并在每次测试前后使用称重传感器作为参考对鞋垫中的所有传感器进行校准。IBM个人计算机对传感器和称重传感器的输出进行采样，并存储一个分段线性查找表，用于补偿传感器的非线性。在个人计算机的图形显示屏上，两个程序以实时条形图或模拟压力与时间曲线的形式显示足部压力。
