基于线性调频技术的超声波测波方法  

Ultrasonic Wave Test Method Based on Linear Frequency Modulation Technology

作　　者：牛志华[1,2] 李醒飞[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]国家海洋技术中心,天津300112

出　　处：《纳米技术与精密工程》2014年第6期411-416,共6页Nanotechnology and Precision Engineering

基　　金：国家海洋局海洋公益性行业科研专项资助项目(200805018)

摘　　要：线性调频相关技术在超声波测波仪中的应用大大提高了测波仪测量精度和分辨力,解决了其在大风浪或近岸破碎波的情况下测量误差过大或检测不到回波的难题.本文阐述了基于线性调频技术的超声波测波原理以及线性调频信号的设计,进行了调频信号相关性分析,并基于该技术设计了测波系统.通过模拟波浪实验对系统的性能、波浪数据的质量进行了验证,结果表明:在大风浪情况下采集到的原始数据未出现丢失现象,1/3波高的误差为5 cm.实验结果证明所研发的测波系统精确度高,适合近岸观测波浪.Linear frequency modulation（ LFM） correlation technology has greatly increased the accuracy and resolution of ultrasonic wave recorder,solving the problems of error excess and echo undetection under the conditions of big waves and near-shore broken waves. Based on ultrasonic wave test principle of LFM technology and LFM signal design,the frequency modulation signal correlation was analyzed,and then the wave test system was designed based on the technology. Through wave simulation,the system performance and wave data quality were confirmed. Results show that under the condition of big waves,no original data was lost and the error of 1 /3 wave height was 5 cm. Experimental results show that the proposed wave test system features high precision and suits for near-shore wave observation.

关 键 词：声学测波仪 回声测距 超声波 线性调频 

分 类 号：P714.1[天文地球—海洋科学] P716.2