摘要
致密气与传统的流量测量方法相比，超声波流量测量技术具有几乎无压损、无阻流部件、非接触式、高精度、测量范围广等优点，广泛应用于石油传输、流量跟踪、用水计费等领域。国外对超声波流量测量技术研究较早，相关产品基本可以满足工业生产的要求，但价格十分昂贵。在这个领域，我国起步较晚，技术累积不足，产品性能也难以达到市场需求。针对这一实际问题，对超声波流量测量技术展开深层次研究，具有重要的研究意义和实用价值。具体研究内容主要包括
以下几个方面:在可可西里回头
首先，通过查阅相关文献资料，给出了超声波流量测量系统的总体设计思路，对常见的超声波流量测量原理展开理论分析，并对超声波传感器结构原理及其安装方式进行了分析比对。最终选定时差法作为测量原理并在算法层次对时差法进行了优化，降低了声速对测量结果的影响。在此基础上，结合超声波回波特性和互相关算法原理，利用FPGA的逻辑特性，设计半并行结构实现互相关算法，提高了超声波渡越时间的测量精度，并进行了应用验证。 其次，对超声波流量测量系统总体进行了设计，采用STM32单片机与FPGA相结合的方式设计了流量
带锯条焊接测量系统的控制核心。其中，STM32单片机负责数据的采集与处理、信息的显示和输出，其硬件平台构建了测量系统的软件系统，FPGA负责逻辑控制以及为硬件电路提供驱动信号，二者相辅相成。TDC-GP22高精度计时芯片与互相关算法模块相结合，共同完成上下游时间的测量。
最后，对所设计的超声波流量测量系统进行了测试验证，搭建了实验检测系统，分别进行了静态流速测量、超声波传感器安装位置偏移误差、层流流速区以及湍流流速区的流量测量等实验。将设计样机的检测数据与参考流量计测量数据进行综合分析。实验结果表明，设计样机在层流区域的相对误差低于3.68％，湍流区域的相对误差小于0.66％。关键词：超声波流量测量，时差法，互相关算法，半并行结构
Research on ultrasonic flow measurement technology and
precision compensation method牙周病学
生命周期价值Abstract
奥尼尔
Compared with the traditional flow measurement methods, ultrasonic flow measurement technology has the advantages of almost no pressure loss, no flow blocking parts, non-contact, high precision, wide measurement range and so on. It is widely used in oil transmission, flow tracking, water billing
and other fields. The research on ultrasonic flow measurement technology abroad is earlier, and the related products can basically meet the requirements of industrial production, but the price is very expensive. In this field, our country started late, the technology accumulation is insufficient, and the product performance is difficult to meet the market demand. In view of this practical problem, it is of great significance and practical value to carry out in-depth research on ultrasonic flow measurement technology. The specific research contents mainly include the following aspects:
First of all, by consulting the relevant literature, the overall design idea of ultrasonic flow measurement system is given, the common ultrasonic flow measurement principle is analyzed theoretically, and the structure principle and installation mode of ultrasonic sensor are analyzed and compared. Finally, the time difference method is selected as the measurement principle, and the time difference method is optimized at the algorithm level to reduce the influence of sound speed on the measurement results. On this basis, combined with the characteristics of ultrasonic echo and the principle of cross-correlation algorithm, using the logic characteristics of FPGA, a semi parallel structure is designed to realize the cross-correlation algorithm, which improves the measurement accuracy of ultrasonic transit time and is verified by application.
Secondly, the overall design of the ultrasonic flow measurement system is carried out, and the contr
ol core of the flow measurement system is designed by the combination of STM32 MCU and FPGA. Among them, STM32 is responsible for data acquisition and processing, information display and output, its hardware platform constructs the software system of measurement system, FPGA is responsible for logic control and provides drive signal for
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