张烈山,张晓琳,唐文彦,邹斌.基于小波脊的水表面声波激光干涉探测[J].光电子激光,2015,26(1):103~107 |
基于小波脊的水表面声波激光干涉探测 |
Detection of water surface acoustic wave using laser interference based on wavelet ridge |
投稿时间:2014-10-15 |
DOI: |
中文关键词: 小波脊 水表面声波 激光干涉 |
英文关键词:wavelet ridge water surface acoustic wave laser interference |
基金项目:国家自然科学基金(61108073)、中国博士后科学基金(2012M510944)和中央高校基本科 研业务费专项资金(HIT.NSRIF.2013023)资助项目 (哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨,150001) |
|
摘要点击次数: 1151 |
全文下载次数: 66 |
中文摘要: |
为准确获取水表面声波的频率,对水表面声波激 光干涉信号的时频分布特点进行了理 论分析和实验研究,发现小波脊点沿着水表面声波频率所对应的尺度 时间曲线分布,或位于该线上,或对称分布于上下两侧。根据此特征,提出了一种基于小波 脊的水表面声波频率解调方法,实验结果表明,本文方法能够对稳频的水表面声波频率进行 精确 测量,绝对误差不大于1Hz。对线性调频的水表面声波进行了探测实验,结果表明,小波脊 能 够实时地跟踪水表面声波频率的变化,通过小波脊计算得到的频率变化率与设定值相吻合, 证明了利用小波脊方法提取水表面声波瞬时频率的准确性。 |
英文摘要: |
In order to obtain the frequency of water surface acoustic wave exactl y,theoretical analysis and experimental research on water surface acoustic wave interference s ignals are demonstrated.We find the wavelet ridge distribution characteristics of these interference signals:the wavelet ridge points distribute along the scale-time curve which is corresponding to the frequency of water surface acoustic wave,some of which are exactly on the curve,while the oth ers symmetrically distribute on the upper and lower sides.According to this characteristic,a kin d of water surface acoustic wave frequency demodulation method based on wavelet ridge is put forwa rd.The experiment results show this method can accurately determine the frequency of st able-frequency water surface acoustic wave,and the absolute error is less than 1Hz.The detecti on experiment of linear frequency-modulated water surface acoustic wave is also carried out.The resu lts show that wavelet ridge can track the frequency change of water surface acoustic wave in r eal-time,and the rate of frequency variation calculated by the method of wavelet ridge matches with the preseted value,which proves the accuracy of extracting the instantaneous frequency of water surface acoustic wave using the wavelet ridge method. |
查看全文 下载PDF阅读器 |
关闭 |
|
|
|
|
|