基于多项式拟合法的超声速度的测量  

The Measurement on speed of the Ultrasound based on Polynomial Fit

作　　者：杨栋[1] 张宗谦[1] 彭虎[1] 

机构地区：[1]安徽省立医院信息中心,安徽合肥230001

出　　处：《生物医学工程研究》2012年第3期173-176,共4页Journal Of Biomedical Engineering Research

摘　　要：我们先对函数曲线进行多项式拟合,再选择参考点进行测量,并同时选择四个零点作为参考点,得出每个零点的SOS后求其平均值,进一步减小了误差。该方法较传统的直接法精确度上有了提高,且操作简单。The traditional method for the sound velocity measurements,which requires a higher precision of the waveform curve,is not easy to choices the reference points,so a larger error exist.We presented a kind of method.First the curve of the function with the polynomial fitting was dealed and then a reference point for measurement process was selected.Besides four zero crossings points were chosen as reference points respectively,SOS was obtained for each point and was averaged to further reduce the error.The method is easy to operate,and the accuracy of the method has been improved.

关 键 词：超声 声速 骨密度 多项式拟合 过零点 

分 类 号：R318[医药卫生—生物医学工程]