光学法复现水声声压中的过零点解调系统设计

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英文篇名：Design of Zero-crossing Demodulation System for Measurement of Underwater Acoustic Pressure by Optical Method 作者：王敏 ; 杨平 ; 何龙标 ; 冯秀娟 ; 杨嘉莉 ; 张跃 英文作者：WANG Min;YANG Ping;HE Long-biao;FENG Xiu-juan;YANG Jia-li;ZHANG Yue;National Institute of Metrology;College of Information Science & Technology,Beijing University of Chemical Technology; 关键词：计量学 ; 水声声压 ; 过零点解调算法 ; 在线解调系统 ; 质点振速 ; 外差干涉法 英文关键词：metrology;;underwater acoustic pressure;;zero-crossing demodulation method;;on-line demodulation system;;particle velocity;;heterodyne interferometry 中文刊名：JLXB 英文刊名：Acta Metrologica Sinica 机构：中国计量科学研究院;北京化工大学信息科学与技术学院; 出版日期：2019-03-22 出版单位：计量学报 年：2019 期：v.40;No.179 基金：国家重点研发计划(2017YFF0206302);; 中国计量科学研究院基本科研业务费项目(AKYTC1601) 语种：中文; 页：JLXB201902023 页数：4 CN：02 ISSN：11-1864/TB 分类号：141-144

摘要

激光外差干涉是新一代水声声压基准的主要技术,光学干涉系统中的信号解调算法直接影响质点振速和声压量值。为准确得到测量结果,详细介绍了如何从多普勒信号中得到水质点振速的过零点解调算法,并建立了一套在线解调系统。该系统利用信号源产生两路相互正交的多普勒信号模拟光电二极管的输出,再经差分放大电路后进入示波器进行数据采集,最后由主机软件在线读取数据并完成质点振速解调。实验结果有效验证了过零点算法和解调系统的正确性和稳定性,所设计的过零点解调系统可直接应用于激光外差干涉法复现水声声压。
        Optical heterodyne interferometry is the mainly recommended technique for the next generation of underwater acoustic standards. The output Doppler signal of the optical interferometer should be demodulated by proper demodulation method,which will directly affect the acoustic particle velocity and pressure. To obtain the accurate reconstruction of underwater acoustic pressure by optical method,a zero-crossing demodulation method is introduced and an on-line demodulation system is designed. This system uses two orthogonal signals generated by function generator to simulate the outputs of photodiodes. A differential amplifier combines the two signals into one,which is recorded by an oscilloscope. Then the data are read and processed by a program containing the zero-crossing demodulation method to extract the acoustic particle velocity. Experiment results demonstrate the validation of the demodulation method and system.The designed zero-crossing demodulation system could be applied to the reconstruction of underwater acoustic pressure using optical heterodyne interferometry directly.

引文

[1] Theobald P D,Robinson S P,Thompson A D,et al.Technique for the calibration of hydrophones in the frequency range 10 to 600 k Hz using a heterodyne interferometer and an acoustically compliant membrane[J]. Journal of the Acoustical Society of America,2005,118(5):3 110-3 116.
    [2] Koukoulas T, Robinson S, Rajagopal S, et al. A comparison between heterodyne and homodyne interferometry to realise the SI unit of acoustic pressure in water[J]. Metrologia,2016,53(2):891-898.
    [3] Wang M, Yang P, He L B, et al. Effects of demodulation methods on the reproduction of underwater acoustic pressure by optical heterodyne interferometry[C]//24th International Congress on Sound and Vibration. London,UK. 2017:1-8.
    [4]王月兵,黄勇军.使用激光测振技术校准水听器灵敏度[J].声学学报,2001,26(1):29-33.Wang Y B,Huang Y J. Calibration of hydrophones using optical technique[J]. Acta Acustica,2001,26(1):29-33.
    [5] Yang P,Xing G,He L. Calibration of high-frequency hydrophone up to 40 MHz by heterodyne interferometer[J]. Ultrasonics,2014,54(1):402-407.
    [6] ISO 16063-41 Methods for the calibration of vibration and shock transducers—Part 41:Calibration of laser vibrometers[S]. Geneva,Switzerland,2011.
    [7] Koukoulas T,Theobald P,Robinson S,et al. Absolute calibration of hydrophones using heterodyne interferometry and zero-crossing signal demodulation[C]//Underwater Acoustic Measurements:Technologies and Results,Greece. 2011:1 205-1 210.
    [8] Koukoulas T,Theobald P,Robinson S P,et al. Particle velocity measurements using heterodyne interferometry and Doppler shift demodulation for absolute calibration of hydrophones[C]//ECUA. 11th European Conference on Underwater Acoustics. Edinburgh,Scotland. 2012:1-10.