| 光纤布拉格光栅传感器的一种波长解调方法 |
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| 引用本文： | 张红霞,郑林,黄岑,刘琨,贾大功,刘铁根,张以谟.光纤布拉格光栅传感器的一种波长解调方法[J].天津大学学报(自然科学与工程技术版),2012(2):111-115. |
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| 作者姓名： | 张红霞 郑林 黄岑 刘琨 贾大功 刘铁根 张以谟 |
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| 作者单位： | 天津大学精密仪器与光电子工程学院;天津大学光电信息技术教育部重点实验室 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)资助项目(2010CB327806);教育部新教师博士点基金资助项目(200800561022) |
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| 摘 要： | 光纤布拉格光栅（FBG）经过中心波长解调，可实现对应变、温度等物理量的高精度传感检测．在光纤光栅传感中，如何检测中心波长的微小移位是传感解调的核心问题．为此，文中介绍了一种基于互相关原理的FBG中心波长解调方法．FBG的初始光谱和被调制后的受扰光谱形状相似，只是中心波长产生了漂移，通过对初始光谱与受扰光谱互相关值的解算，即可解调出中心波长的位移量．将实验结果与自相关法、功率加权法和最小二乘法等波长解调方法进行了对比，结果表明互相关方法可以有效地进行中心波长解调．
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| 关 键 词： | 光纤传感 光纤布拉格光栅 波长解调 互相关 |
A Wavelength Demodulation for Fiber Bragg Grating Sensor |
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| ZHANG Hong-xia,ZHENG Lin,HUANG Cen,LIU Kun,JIA Da-gong,LIU Tie-gen,ZHANG Yi-mo.A Wavelength Demodulation for Fiber Bragg Grating Sensor[J].Journal of Tianjin University(Science and Technology),2012(2):111-115. |
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| Authors: | ZHANG Hong-xia ZHENG Lin HUANG Cen LIU Kun JIA Da-gong LIU Tie-gen ZHANG Yi-mo |
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| Institution: | 1,2(1.School of Precision Instrument and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China;2.Key Laboratory of Opto-Electronics Information Technology of Ministry of Education,Tianjin University,Tianjin 300072,China) |
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| Abstract: | By demodulating the central wavelength,fiber Bragg grating(FBG)can be used for high precision detec-tion in strain,temperature and other physical quantities.The key problem of this demodulation method is the detec-tion of the slight shift of the central wavelength.In this paper,a FBG central wavelength demodulation algorithm based on cross-correlation is presented.The perturbed and undisturbed spectra of FBG have the similar form,except a slight shift of the central wavelength.By computing the cross-correlation between the perturbed and undisturbed spectrums,the slight shift of the central wavelength can be obtained.Compared with the auto-correlation algorithm,the weighted wavelength algorithm and the least squares algorithm,the cross-correlation algorithm can demodulate the central wavelength shift effectively in experiments. |
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| Keywords: | optical fiber sensor fiber Bragg grating wavelength demodulation cross-correlation |
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