提高超声步态检测系统精度的研究

Research for Increasing the Accuracy of the Ultrasonic Gait Analysis System

本研究组曾报告了超声下肢步态仪的成功研制，而本文工作即是在此基础上针对影响超声步态仪精度的多种因素进行详细研究之后提出并实施了若干措施而有效地将超声步态仪的精度由０．２％提高到０．１％。本文结果证明，这些措施的应用不仅有利于超声步态仪检测精度的提高，而且也将有助于仪器中新功能的实现。

We have previously reported the configuration of our ultrasonic gait analysis system (UGAS). The purpose of this article is to examine the various factors which substantially decreased the measuring accuracy of the UGAS and to present three ways to eliminate or to minimize those errors. These methods include a new ultrasonic transducer pulse actuator with a silicon controlled rectifier, signal smoothing amplifier and a new set of ultrasound reflection eliminator. Experimental results show that the application of these methods not only significantly increased the accuracy of UGAS from less than 0 2% to 0 1%, but also had benefits for measuring the subjects' gait of two sides simultaneously.