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声波测井中发射出的声波有其频率分布和频谱主值,发射出的频谱主值约在20KC左右。但是,接收到的声波频谱主值要降低,例如降低到17KC左右。实验证明,这种声波频谱主值的降低,和介质的种类有关,而且随着透过的介质层厚度而增加。这种现象不便假设声频本身发生改变来解释,因为发射出的声频应能决定接收到的声频有同一数值。但是,这种现象可以引用介质对不同频率的声波有着不同的吸收系数来解释。当声波透过介质时,其频谱中频率较高的成份被吸收较多,因而接收到的频谱主值移向低频,即接收到的频谱主值比发射出的频谱主值要降低。
Acoustic wave emitted acoustic waves have their frequency distribution and the main value of the spectrum, the main emission spectrum is about 20KC. However, the main value of the received acoustic spectrum is reduced, for example to about 17KC. Experiments show that the reduction of the main value of this acoustic spectrum is related to the type of media and increases with the thickness of the dielectric layer that is passed through. This inconvenience is explained by the assumption that the audio itself changes, since the transmitted audio should have the same value as the received audio. However, this phenomenon can be explained by referring to the medium with different absorption coefficients for different frequencies of sound waves. When the sound wave is transmitted through the medium, the higher frequency components in the spectrum are absorbed more, so the received primary frequency of the spectrum moves to the lower frequency, that is, the received primary value of the spectrum is lower than the primary value of the transmitted spectrum.