用能量法测定柱状样品的衰减Q值

Measurement of Attenuation Q value of Cylindrical Sample by Using Wave Energy

对常用的测试衰减Q值的频谱振幅比法和波形反演法进行了分析,认为它们对样品几何形状和大小的严格要求是大多数实验室待测样品所不能满足的。因而,提出了用波形的能量来计算衰减Q值的方法,阐述了其原理、计算公式和注意事项,讨论了QP和QE之间的关系,并对多种样品进行了实验室测量。将本方法测得到的Q值与其它方法测试值进行了比较,认为本方法的Q值介于QP和QE之间。

Two methods for measuring the attenuation \%Q\% value, frequency\|amplitue ratio method and waveform inversion method, were analyzed. The sizes and shapes of most rock samples in the laboratory are hardly to satisfy the requirement of the above methods. A new test method that used the wave energy to calculate the \%Q\% value was proposed. The principle, calculation formers and some notice matters were expounded.The relationship between Q \-P and Q E was discussed. Many samples were measured by this method. The result Q value was compared with that by other methods and was located between Q \-P and Q \-E.