1、- I - 基于单片机的流量信号检测系统设计基于单片机的流量信号检测系统设计 摘要摘要 在工业自动化中，任何控制系统都是从生产过程运行的信息测量开始的，过 程变量的自动检测仪表是自动化系统革命的关键。和温度、压力一样，流量也是 生产过程中的重要变量。流量的精确测量在节能降耗、经济核算、自动控制等方 面有着广泛的应用。 涡街流量计以其自身的一系列优点己经成为流量测量仪表家 庭中不可缺少的一员，在计量检测中发挥着越来越大的作用。 本文研究一种适用于微小流量信号检测的流量测量系统， 该流量计是基于涡 街流量计原理，即流体产生漩涡，漩涡分离产生应力，漩涡的分离频率等同于应 力的变化频率，通过测量应力的
2、周期变化知道漩涡分离频率，从而准确的反映被 测液体的流速。 本文详述了涡街流量计及压电式传感器的原理，并设计了信号调理电路，处 理来自压力传感器的微弱电压信号，使之能够满足单片机对输入信号的要求。另 外本文还设计了智能化单片机软硬件系统并对系统进行了功能扩展， 使整个系统 不仅能够准确实时地反映被测流量的大小，而且能够实现信号的远程传输，为系 统的智能化远程控制提供条件。 关键词关键词 流量计；流量；单片机；卡门涡街 - II - The designment of the flow signal detection system based on SCM Abstract In indust
3、rial automation, many control systems begin from the information from the production process operation.The automatic measuring instrument of the process variable is the key of automation system of revolution. Liking temperature, pressure, flow rate is an important variable of the production process.
4、 The flow has a wide application in energy consumption, precise measurement, economic accounting and automatic control. With its own vortex advantages, a flowmeter has become an indispensable member of the family, which has a series of flow measuring devices.It plays a more and more important role i
5、n measuring. This article applies a flow measurement system, which is used in the minor flow signal detection of the flow measurement system. The flowmeter is based on the principle of vortex flowmeter.The flow makes the vortex.The separating of the vortex makes the stress. The frequency of the flow
6、 separation equals the stress frequency.We knows the accurate flow by the frequency of the flow separation, which is calculated from the the stress frequency. This article describes the principle of vortex flowmeter and the piezoelectric sensors and designs the singal condition circuit, which process the weak signal from pressure sensor, to meet the requirements of the input signal chip. Additionally, this article also micro controller hardware and software design of the system and intelligen
