基于FPGA的超声波液体密度传感器  

Ultrasonic Liquid Density Sensor Based on FPGA

作　　者：姚明林[1] 陈先中[2] 

机构地区：[1]唐山学院信息工程系,河北063000 [2]北京科技大学信息工程学院,北京100083

出　　处：《微计算机信息》2007年第06S期177-178,201,共3页Control & Automation

摘　　要：液体密度是工业生产中一个重要的参数,尤其是在医药、化工等领域。本文采用双探头结构,利用声速法测量液体密度,其关键是准确测量超声波在液体中传播时间。传统电路设计由于受到芯片时钟频率的影响,测量效果往往不够理想。为了能够得到精确的测量时间,采用内部时钟频率较高的FPGA来设计高精度的计数器。同时,为了减少外围电路,避免电子器件之间的电磁干扰,系统中的控制和计算模块也都由FPGA来完成。经过实验,结果表明本方法具有较高的可靠性和速度上的优越性。Liquid density is one of the important parameters in many industrial fields, especially in pharmacy and biochemistry industry. In the design, the double-probe structure is adopted, and the operation principle of the ultrasonic density sensor is based on time law. So, the time measurement precision must be very high. In traditional circuit design, for the limited by the internal clock of the chip, the perfect result can＇t be got. By using the FPGA to design the high precision counter, the accurate measurement time can be achieved. To reducing the peripheral circuit＇s size and the electromagnetic interference between the electronic devices, the FPGA also be used to design the control and operation module. Through the experiment, the result indicated that this method has the advantages in speed and reliability.

关 键 词：超声波 液体密度 FPGA 声速法 

分 类 号：TH835[机械工程—仪器科学与技术]