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给出了基于宽谱光源问讯的具有波长标定功能的多模光纤温度传感器理论分析,指出光谱中凹陷所对应的特征波长位置是由多模光纤中激励起的多个传输模式再次耦合到引出单模光纤中进行干涉决定;特征波长由多模光纤的芯径、长度、纤芯和包层折射率决定。利用提出理论对光源光谱ASE的光谱范围中出现的特征波长的个数进行了分析模拟,并优化设计了只出现一个特征波长的多模光纤温度传感器,制作了三个长度分别约为4 cm,5.5 cm和10 cm的只有一个特征波长的多模光纤温度传感头,利用毛细玻璃管进行了封装,并利用分辨率为0.01 nm的光谱分析仪进行了温度测量实验,发现温度与特征波长漂移的线性关系约为13 pm/℃。
The theoretical analysis of a multimode fiber temperature sensor with wavelength calibration based on wideband light source is given. It is pointed out that the characteristic wavelength position corresponding to the recess in the spectrum is coupled to a single output from multiple transmission modes excited by multimode fiber. Mode interference in the fiber decision; characteristic wavelength by the multimode fiber core diameter, length, core and cladding refractive index decision. The number of characteristic wavelengths appearing in the spectral range of the light source spectrum ASE was analyzed and simulated based on the proposed theory. The multi-mode optical fiber temperature sensor with only one characteristic wavelength was designed and optimized. Three lengths with lengths of about 4 cm, 5.5 cm and 10 cm only one characteristic wavelength multi-mode fiber temperature sensor head, the use of capillary glass tube packaging and the use of a resolution of 0.01 nm spectrometer temperature measurement experiments found that the temperature and the characteristic wavelength drift The linear relationship is about 13 pm / ° C.