| 测量光纤外腔Fabry-perot干涉仪的白光干涉术 |
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| 引用本文： | 江毅.测量光纤外腔Fabry-perot干涉仪的白光干涉术[J].光子学报,2006,35(3):381-384. |
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| 作者姓名： | 江毅 |
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| 作者单位： | 北京理工大学信息学院光电工程系,北京,100081 |
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| 基金项目： | 国家自然科学基金(60277015)，国家高技术研究发展计划(2004AA616020)，教育部回国人员留学基金(2004527)资助项目 |
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| 摘 要： | 提出了一种基于白光干涉术测量低锐度光纤外腔Fabry Perot干涉仪（EFPI）的方法用宽带光源注入F P腔，在接收端用一高锐度的可调谐光纤F P滤波器对EFPI的反射光谱进行扫描，获得了周期性变化的光谱输出为了测量出EFPI的腔长，对光谱信号进行傅里叶变换，得到光谱的周期，由此求出EFPI的绝对腔长证明了用低锐度EFPI的测量准确度由腔长决定F P腔越长，测量准确度越高在腔长分别是200 μm,400 μm和600 μm时，测量的腔长与实际腔长相同.
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| 关 键 词： | 波导与纤维光学 光纤传感器 光纤外腔Fabry-Perot干涉仪 傅里叶变换 |
| 收稿时间： | 2005-07-22 |
| 修稿时间： | 2005年7月22日 |
White Light Interferometry for the Measurement of Extrinsic Fabry-Perot Interferometer |
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| Jiang Yi.White Light Interferometry for the Measurement of Extrinsic Fabry-Perot Interferometer[J].Acta Photonica Sinica,2006,35(3):381-384. |
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| Authors: | Jiang Yi |
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| Institution: | Department of Optical Engineering, School of Information Science and Technology,
Beijing Institute of Technology, Beijing 100081 |
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| Abstract: | The white light interferometry for the measurement of low-finesse extrinsic Fabry-Perot interferometer(EFPI) is reported. A broadband light is injected into EFPI,and the reflected light is scanned by another high-finesse tunable Fabry-Perot filter,the periodic spectra of EFPI can be obtained.To measure the cavity length,the spectra are fast Fourier transformed,the absolute length of cavity can be calculated by using the periodic spectra. The measuring accuracy is limited by the length of cavity. The longer cavity has higher measuring accuracy. When the length of cavity are 200 μm,400 μm,and 600 μm respectively,the measured results are agree with the actual length of the cavity. |
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| Keywords: | Guiding wave and fiber optics Optical fiber sensor Fiber extrinsic Fabry-Perot interferometer FFT |
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