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本文介绍一种利用声波测量管长的单片机系统，测量精度可达2‰～3‰，且有较强的抗干扰能力。系统的微机部分用89C51单片机，并用Newton插值算法来补偿其非线性。
This article describes a use of sonic measurement tube length microcontroller system, the measurement accuracy of up to 2 ‰ ~ 3 ‰, and has a strong anti-interference ability. The microcomputer part of the system uses 89C51 one-chip computer, and use Newton interpolation algorithm to compensate its non-linearity.