基于自干涉驱动技术的超声波飞行时间测量系统优化设计  

Optimization on Ultrasonic Time-of-Flight Measurement System Based on Self-Interference Driving Technology

作　　者：王雪峰[1] 唐祯安[1] 

机构地区：[1]大连理工大学电子科学与技术学院,辽宁大连116023

出　　处：《传感技术学报》2010年第10期1439-1443,共5页Chinese Journal of Sensors and Actuators

摘　　要：超声波飞行时间测量极易受到噪声的干扰而影响检测精度。针对这一难点,利用幅值、相位调节技术驱动超声波换能器产生自干涉发射波形,通过相位检测预判接收信号到达时间,结合双阈值拟合算法计算飞行时间。该系统以信号处理器DSP为核心,采用CPLD完成高精度数字相位检测。与传统的超声波飞行时间阈值检测方法相比,该系统具有测量精度高、抑制噪声干扰等优点。Determination accuracy of ultrasonic time-of-flight can be easily affected by noises in practical measurements.Focusing on this problem,this paper combines with three advanced techniques to achieve the accurate time-of-flight measurement.Firstly,self-interference driving ultarsonic waves are stimulated from the piezoelectric transducer by amplitude and phase modulation techniques.Secondly,phase monitor is designed for roughly pre-detecting the received ultrasonic wave arrival time.Finally,double-threshold algorithm is employed for the final time-of-flight determination.The system is integrated in a single PCB board that is made up of digital signal processor,complex programmable logic device and some functional modules.Comparing with the traditional ultrasonic time-of-flight threshold crossing method,the systen has some advantages such as high resolution and high nosie suppression.

关 键 词：超声波 自干涉 数值拟合 飞行时间 

分 类 号：TB553[理学—物理]