CAJ | 학술논문

深入研究了 VBOTDA(矢量布里渊光时域分析)系统的原理，该系统在传统 BOTDA(布里渊光时域分析)系统的基础上采用外差方案，可提高系统信噪比并获得布里渊相移信息。文章提出了一种将叠加平均去噪算法与 FFT(快速傅里叶变换)分析法相结合的相位解调方法———频谱算法，进行了理论分析并搭建实验平台验证了该算法的可行性和有效性。结果表明，该算法对不同信噪比下的信号均有较好的解调效果；对幅值为0.3 V 且噪声标准偏差为0.5 V 的信号，采用1000次叠加平均的频谱算法，相位相对测量误差可降至0.71%。
심입연구료 VBOTDA(시량포리연광시역분석)계통적원리，해계통재전통 BOTDA(포리연광시역분석)계통적기출상채용외차방안，가제고계통신조비병획득포리연상이신식。문장제출료일충장첩가평균거조산법여 FFT(쾌속부리협변환)분석법상결합적상위해조방법———빈보산법，진행료이론분석병탑건실험평태험증료해산법적가행성화유효성。결과표명，해산법대불동신조비하적신호균유교호적해조효과；대폭치위0.3 V 차조성표준편차위0.5 V 적신호，채용1000차첩가평균적빈보산법，상위상대측량오차가강지0.71%。
This paper studies in-depth the principle of the Vector Brillouin Optical Time Domain Analysis (VBOTDA)system. This system adopts a heterodyne detection scheme on the basis of the conventional BOTDA system,thereby enhancing the sys-tem Signal-to-Noise Ratio (SNR)and acquiring Brillouin phase-shift information.Then,it proposes a phase demodulation method,i.e.the spectrum algorithm that combines the superimposed average denoising algorithm with the FFT analysis.The-oretical analysis and experimental demonstration verify its feasibility and effectiveness in that it is effective in demodulating sig-nals with different SNR and for signals with 0.3 V amplitude and noise standard deviation of 0.5 V,and the phase relative measuring error can be lowered to 0.71% when the spectrum algorithm superimposed 1 000 times is used.