基于嵌入式的智能流速仪研制

Research of intelligent flow meter based on embedded microprocessor

流速仪为水工筑建设计提供准确的江河的流速值,随着应用需求的增加,原有的8位单片机控制系统不能完全满足现代水文测量的需要。本文研制了一种旋桨式传感器的智能流速仪,以AT91SAM9261为微处理器,采用CPLD芯片为流速数据采集接口,配以TFT-LCD显示屏,移植uClinux实时操作系统,具有测周、计数、双向测速等多种测量方式,可实现16个通道同步独立检测。系统测量方式灵活,测量时间短,测量精度高,稳定可靠等特点,广泛用于水文检验部门和科研设计院等单位。

Flow meter provide accurate flow of the rivers to hydraulic architectural design. With the increase in demand , the original control system based on the 8-bit microcontrollers can not fully meet the needs of modern hydrographic survey. The paper develops a intelligent flow meter of propeller type flow sensor . The instrument consists of AT91SAM9261 microprocessor and the TFT-LCD and so on . A complex programmable logic device （CPLD） is employed to construct flow sample unit. The instrument has multiple measurement modes such as pulse frequency measurement and dual direction flow measurement. 16 paths flow can be measured synchronously. The instrument transplanted uClinux real-time operating system has the advantages of high precise, high stability and so on. The instrument has been widely used in test related hydrological departments , scientific research and design institute, and other units.