这是一份关于在分布式测量系统中测量天然气的单路超声波流量计的技术说明。它包含操作原理、技术问题、测量性能评估、误差分析、测试和校准、参考文献等信息。

This is a technical note on single-path ultrasonic meters for measuring natural gas in distribution measurement systems. It contains information on principles of operation, technical issues, evaluation of measurement performance, error analysis, testing and calibration, references.