非接触式明渠流量计的研制  

Development of Non-Touch Ultrasonic Open Ditch Flow Meter

作　　者：常凤筠[1] 崔旭东[2] 

机构地区：[1]辽宁科技大学电子与信息学院,辽宁鞍山114044 [2]鞍山师范学院计算中心,辽宁鞍山114005

出　　处：《石油化工高等学校学报》2007年第3期68-70,共3页Journal of Petrochemical Universities

基　　金：国家自然科学基金资金资助(60474058)

摘　　要：针对超声波流量计测量精度易受温度影响问题,利用标准杆进行温度补偿,避免了温度变化对测量精度的影响。对流量计的硬件电路进行分析和设计,发射电路利用555多谐振荡器,产生40 kHz的超声波,接收电路对回波信号进行一系列处理,通过对接收信号进行放大、滤波、检波、比较器反转,产生中断信号,软件设计实现回波信号振荡的消除。实践表明,该装置具有计量准确、运行可靠、价格低廉特点。Since the accuracy of ultrasonic flowmeter is easily influenced by temperature, the standard pole was used for the temperature compensation. It can avoid the influence on the measure accuracy by temperature variation. Its hardware circuit was discussed and designed. The transmitting circuit produced 40 kHz of ultrasonic wave using 555 oscillator. In the receiving circuit, the received wave was amplified, filtered, detected. The turning of comparators was taken as indicators to interruption reception of ultrasonic wave. The software designing realized oscillating eliminating of the received wave. The results show that the system can obtain the characteristics of high--precision, operation credibility and low price.

关 键 词：超声波 流量计 温度补偿 明渠 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]