过去，机械流量计和电磁流量计占据了国内流量计市场的绝大多数份额。但是，二者都存在着致命的缺陷，比如寿命短、流体质量要求高等，这些缺陷阻碍了流量计性能的进一步提升。近些年，超声波流量计在流量测量仪器领域所发挥的作用越发重要。相比于其它流量计，超声波流量计维护方便、寿命长等特点使其更能满足市场需求。最重要的是，它更容易获得高精度的测量结果。 随着超声波流量计在工业和商业领域得到越来越广泛的应用，也就越来越迫切地需要提高其测量性能。为了改进超声波流量计的测量稳定性，本文设计了一种圆管和方管相结合的新型流量管。其中，流量管的进口管段和出口管段都设计成圆管，而中间的测量管段设计为带圆弧的方管。这种结构...In the past, the mechanical flow meter and the electromagnetic flow meter occupied the majority domestic market. However, both of them had significant drawbacks, such as short life-span, requirement of high-quality liquid and so on, which thus enabled them hard to further improve the level of ultrasonic flow measurement. In recent years, the ultrasonic flow meter has played a more and more importa...学位：工程硕士院系专业：物理与机电工程学院_工程硕士(电子与通信工程)学号：3312012115266
