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基于应力型保偏光纤传输差对温度的敏感性及保偏光纤模式干涉理论,提出了利用波长的温度检测方法并推导出传感方程。传感方程表现出的温度与干涉频谱中对应的空间频率间呈线性关系,简化了温度解算的程序。实验中,对Fabry-Perot(F-P)可调谐滤波器的工作电压与相对应的允许通过波长的关系进行了研究,并使用F-P可调谐滤波器取代光谱仪来获取光谱,简化了实验设备。由于被测信息仅与波长信息有关,而与光在传播过程中所引起的光源光功率的浮动无关,所以,使用这种检测方法消除了光源的浮动以及光在传输过程中的损耗等对系统的稳定性和精度的不利影响,提高了传感器的环境适应能力。
Based on the sensitivity of temperature difference of polarization-maintaining fiber to the temperature and the theory of polarization-maintaining fiber mode interference, a temperature detection method based on wavelength is proposed and the sensing equation is deduced. The temperature exhibited by the sensor equation is linearly proportional to the corresponding spatial frequency in the interference spectrum, simplifying the temperature solution procedure. In the experiment, the relationship between the operating voltage of Fabry-Perot (F-P) tunable filter and the corresponding pass-through wavelength was studied and the F-P tunable filter was used instead of the spectrometer to obtain the spectrum, which simplified the experimental equipment. Since the information to be measured is only related to the wavelength information and is not related to the floating of the optical power of the light source caused by the propagation of light in the light, the detection method is used to eliminate the floating of the light source and the loss of light in the transmission, The stability and accuracy of the adverse effects of improved sensor adaptability to the environment.