利用超声波进行管道流量测量受管道内流速分布的制约，存在模型误差，需要根据不同应用场合分别进行仿真或实流校正。本项目拟设计一种新型声道布置方式，在此布置下获取高精度的超声波飞行时间，利用计算机层析成像方法建立管道内的流速分布剖面图，最终精确地获取管道流量。这种新型的超声波流量测量系统能够实现对多种流速分布状态的监测，具有很强的适用性。此外，由于新型探头和声道布置方式的采用，该测量系统能对管道截面进行全面取样，并很好地消除流场内漩涡对测量的影响。新型声道布置方式配合高精度的飞行时间测量算法，该系统的测量准确度大幅度提高。

Ultrasonic flow measurement in conduct is affected by model errors as it is restricted by the flow velocity distribution in conduct,which must be therefore simulated or corrected according to different applications. This project designs a new arrangement for sound channels, with which a high-precision ultrasonic echo time of flight can be obtained. By using a computerized tomographying method, a flow velocity distribution countour map can be established and the conduct flow can be accurately obtained. This new ultrasonic flow measurement system can be used to monitor various flow velocity distributions for various applications. In addition, since new ultrasonic probes and sound channel arrangemnts are adopted in the system, a complete sampling over a whole conduct section can be realized, and the influence of the eddies in the flow field on the measurement can be effectively avoided. With the new sound channel arrangement and the high-precision algorithm for measutement of echo time of flight, the measurement accuracy of the system can be improved greatly.