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《Acta Optica Sinica》 2017-08
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Spectral Resolution Improvement Technique for Optical Frequency-Domain Reflectometry-Based Optical Fiber Distributed Sensing

Zhang Chao;Yang Nan;Bao Yan;Zheng Puchao;Zhang Bing;Xi'an Flight Automatic Control Research Institute,Aviation Industry Corporation of China;  
A research for optical fiber distributed sensing technique based on optical frequency-domain reflectometry is conduct to realize the health monitoring for aircraft structure with high accuracy and high resolution.The principle of cross-correlation distributed sensing based on Rayleigh scattering spectrum is introduced,and the limitation factor of sensing gauge length in traditional cross-correlation method on spectral resolution is analyzed.A Fourier interpolation method is proposed to enhance the spectral resolution,and experiments are carried out to verify the spectral resolution.The experimental results show that continuous distributed sensing can be obtained with the proposed method when we use a 14.2msingle mode fiber with spectral resolution of 1.6pm and sensing gauge length of 1cm.The proposed method with high accuracy and high resolution is promising in short and medium health monitoring applications.
【Fund】: 国防预研究基金(6141B05060106)
【CateGory Index】: TP212
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