After some correction of the apparent reflection coefficient, the extent of wave impedance differences of the reflection interfaces can be analysed quantitatively and, on such a basis, the defective position of the pile body can be detected.

• 将视反射系数经过一定的校正后，可定量分析反射界面的波阻抗差异的大小，进而确定桩身缺陷的严重程度；反射波往返时则用来推算桩身缺陷的位置。