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介绍了吸收型光纤气体传感器的工作原理,提出并分析了基于差分后谐波检测的光纤气体传感器的模型,并设计了传感器系统结构。利用参考光路与检测光路光强的差分消去基波分量,对差分后的信号再进行二次谐波检测得出气体浓度。使用该方法提高了系统检出二次谐波分量的能力,同时有效地提高了系统的分辨率。实验结果表明基于差分后谐波检测的光纤气体传感器具有良好的检测效果。
The working principle of optical fiber gas sensor is introduced. The model of optical fiber gas sensor based on differential post-harmonic detection is proposed and analyzed. The structure of sensor system is also designed. The fundamental component is eliminated by the difference between the light intensity of the reference light path and the detection light path, and then the second harmonic detection is performed on the differenced signal to obtain the gas concentration. The method is used to improve the ability of the system to detect the second harmonic components and effectively improve the resolution of the system. The experimental results show that the optical fiber gas sensor based on differential post-harmonic detection has a good detection effect.