电子科技
電子科技
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Electronic Science and Technology
2015年
9期
19-22
,共4页
分布式测温%拉曼信号%自适应滤波%变步长%最小均方根
分佈式測溫%拉曼信號%自適應濾波%變步長%最小均方根
분포식측온%랍만신호%자괄응려파%변보장%최소균방근
distributed temperature%Raman signal%adaptive filtering%variable step size%minimum rms
信号采集和数据处理是分布式光纤测温系统的核心，信号中的噪声决定了整个系统的测量精度，空间分辨率，采集速度及最终的请求响应时间。通常系统采集到微弱的温度信息的反斯托克斯信号会被完全淹没在噪声中。因此，得到含有温度信息的有用信号就显得尤为重要。文中针对系统中噪声信号的特征，提出一种变步长的最小均方根自适应滤波算法，对拉曼散射的温度信号进行去噪处理并进行Matlab仿真。仿真结果表明，该算法有效提高了去噪的效果，从而可提升整个系统的测量精度，空间分辨率。
信號採集和數據處理是分佈式光纖測溫繫統的覈心，信號中的譟聲決定瞭整箇繫統的測量精度，空間分辨率，採集速度及最終的請求響應時間。通常繫統採集到微弱的溫度信息的反斯託剋斯信號會被完全淹沒在譟聲中。因此，得到含有溫度信息的有用信號就顯得尤為重要。文中針對繫統中譟聲信號的特徵，提齣一種變步長的最小均方根自適應濾波算法，對拉曼散射的溫度信號進行去譟處理併進行Matlab倣真。倣真結果錶明，該算法有效提高瞭去譟的效果，從而可提升整箇繫統的測量精度，空間分辨率。
신호채집화수거처리시분포식광섬측온계통적핵심，신호중적조성결정료정개계통적측량정도，공간분변솔，채집속도급최종적청구향응시간。통상계통채집도미약적온도신식적반사탁극사신호회피완전엄몰재조성중。인차，득도함유온도신식적유용신호취현득우위중요。문중침대계통중조성신호적특정，제출일충변보장적최소균방근자괄응려파산법，대랍만산사적온도신호진행거조처리병진행Matlab방진。방진결과표명，해산법유효제고료거조적효과，종이가제승정개계통적측량정도，공간분변솔。
The core of a distributed optical fiber temperature measurement system ( DTS ) is signal collection and data processing.The measuring accuracy, spatial resolution, collecting speed and final response time are all af-fected by the noise in signal.The anti-Stokes signal contains very weak temperature information and is often com-pletely overwhelmed by noise.Therefore, getting the useful temperature information from the signal is particularly important.A variable step size least-mean-square (LMS) adaptive filtering algorithm is researched for the character-istic of the noise signal in distributed optical fiber temperature measurement system and used to denoise the Raman scattering temperature signal.Matlab simulation shows that this algorithm has good denoising performance and im-proves the system measurement accuracy and spatial resolution.
