Low power ultrasonics are used for testing high density polyethylene pipe material. Attenuation and velocity give valuable information on the material in situ and without damages. In this paper we revisit recent data in the frequency band (4,10) megahertz. We prove that propagation is equivalent to random delays following stable probability laws. Moreover, the emergence of a companion noise non-detectable by devices is compliant with the law of conservation of energy.

中文翻译：

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超声波通过聚乙烯的随机传播时间

低功率超声波用于测试高密度聚乙烯管材。衰减和速度可提供有关原位材料的宝贵信息，并且不会造成损坏。在本文中，我们重新审视了频段 (4,10) 兆赫兹的最新数据。我们证明传播等效于遵循稳定概率定律的随机延迟。此外，设备无法检测到的伴随噪声的出现符合能量守恒定律。