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基于对双光束干涉型光纤传感器原理的分析,针对洛仑兹、高斯、矩形3种典型光源谱分布,通过对谱分布线宽与光电管接收端功率谱密度之间关系的定量分析,讨论了3种典型光源谱分布特性对传感器灵敏度的影响。假设光场为稳态、遍历随机过程,定量分析了光源谱线宽与接收端相位改变量之间的关系,对比了3种光源谱特性对于传感器精度的影响。结果表明:当时延小于阈值时,采用洛仑兹光源谱的传感器灵敏度最大;当时延大于阈值时,采用矩形光源谱的传感器灵敏度随时延呈周期振荡变化。同时,3种光源谱分布下,洛仑兹光源谱分布线宽对传感器精度的影响最大,矩形光源谱分布线宽对传感器精度的影响最小。
Based on the analysis of the principle of double-beam interference optical fiber sensor, the spectral distribution of three typical light sources such as Lorentz, Gauss and Rectangular is analyzed. By quantitative analysis of the relationship between the spectral distribution linewidth and the power spectral density at the receiving end of the phototube, Influence of Spectral Distribution Characteristics of Three Typical Light Sources on Sensitivity of Sensors. Assuming that the light field is steady state and traversing the random process, the relationship between the spectral width of the light source and the phase change of the receiving end is quantitatively analyzed. The influence of the spectral characteristics of the three light sources on the accuracy of the sensor is compared. The results show that when the delay is less than the threshold, the sensitivity of Lorentz source spectrum is the highest. When the delay is greater than the threshold, the sensitivity of the sensor with rectangular light source changes with the periodic oscillation. At the same time, the spectral distribution of Lorentz sources has the greatest influence on the sensor accuracy under the three light source spectral distributions, and the linewidth of the rectangular light source distribution has the least influence on the sensor accuracy.