高精度微距超声波测距系统  

High-precision Ultrasonic Measurement System for Micro-Distance

作　　者：倪卫宁[1] 朱祖扬[1] 张卫[1] 李三国[1] 李胜[2] 

机构地区：[1]中国石化石油工程技术研究院,北京100101 [2]中海油田服务股份有限公司油技事业部,天津300451

出　　处：《仪表技术与传感器》2014年第1期75-76,92,共3页Instrument Technique and Sensor

摘　　要：根据超声波测距原理和井径测量对测距的要求,在基本超声波测距原理基础上,设计实现了一种低盲区、低功耗、高精度、小尺寸的超声测距系统。通过采用增益可编程的反射波信号检测方法,进行多次的增益校正,使得首个反射波信号前沿被比较器扑捉到。通过计量发射波时刻到首个反射波信号前沿的时间可以计算出高精度的距离值。实验结果表明,采用1 MHz谐振频率的超声波换能器,发射功率100 mW,距离测量精度为±1 mm,测量盲区为25 mm.In this paper,the principle of ultrasonic distance measurement is described and the special requirements of caliper measurement are analyzed also.A low-blind,low-power,high-precision,small size ultrasonic distance measurement system is designed and implemented.Because the variable gain detection circuit and the several gain calibrations are utilized,the first echo signal frontier is captured by the comparator and the precision of measurement is effectively improved.The experimental results show that the measuring precision is ± 1 mm,the blind distance is 25 mm,when 1 MHz ultrasonic transducers and 100mW transmit power are chosen.

关 键 词：井径 超声波测距 增益控制 

分 类 号：TH816[机械工程—仪器科学与技术]