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对干涉式光纤传感器来说 ,光源的谱宽直接影响着传感器的工作特性。从法布里珀罗干涉式光纤传感器出发 ,推导其灵敏度的理论表达式 ,并用MathCAD软件进行了数学分析 ,讨论了光源谱宽对传感器灵敏度的影响。介绍了具有温度反馈功能的法布里珀罗光纤干涉实验系统 ,给出了用该实验系统拍摄的谐振曲线照片。从该系统进行的两个重要的实验 (不同干涉腔长的灵敏度对比实验和不同干涉长度的光源实验 )表明 ,法布里珀罗干涉式光纤传感器的灵敏度与光源谱宽的理论表达式是正确的 ,理论公式与实验结论能很好地吻合。最后指出了该方法可以用于分析其他类型的干涉式光纤传感器的灵敏度问题 ,为光源的选择提供了参考
For interferometric fiber optic sensors, the spectral width of the light source directly affects the operating characteristics of the sensor. Based on the Fabry-Perot interferometric fiber optic sensor, the theoretical expression of sensitivity is deduced and analyzed by MathCAD software. The influence of spectral width of light source on the sensitivity of the sensor is discussed. The Fabry-Perot optical fiber interference experiment system with temperature feedback is introduced, and the photos of the resonant curve taken by this experimental system are given. Two important experiments performed from this system (sensitivity contrast experiments with different interference cavity lengths and light source experiments with different interference lengths) show that the theoretical expression of the sensitivity and spectral width of the Fabry-Perot interferometric fiber sensor is correct The theoretical formula and experimental conclusion can well fit. Finally, it is pointed out that this method can be used to analyze the sensitivity of other types of interferometric fiber optic sensors, providing a reference for the selection of light sources