基于超声法测量空气声速的声时计量校验  

Time Adjustment of Testing Ultrasonic Velocity in Air

作　　者：童寿兴[1] 

机构地区：[1]同济大学材料科学与工程学院,上海200092

出　　处：《无损检测》2006年第9期456-457,共2页Nondestructive Testing

摘　　要：研究表明在用测量空气声速的办法来检验仪器的计时性能和操作者的测读方法中,如布置的测点数量太少或不采用首波等幅读数时,以时-距回归的直线斜率为空气声速的测量值随机误差很大。Testing of ultrasonic velocity in air is a usual method to determine the instruments＇ accuracy and the operators＇ skill. However, if the sampling points are so few and the first wave amplitude is not equal, the velocity obtained by the time-dlstance linear equation has a huge deviation.

关 键 词：超声波 空气 声速测量 

分 类 号：TG115.28[金属学及工艺—物理冶金]