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提出了一种基于窄带扫描光源的光纤气体传感系统。该系统能在多种气体共存环境下,完成对不同组分气体浓度的检测。克服了传统光纤气体传感系统在多种气体共存环境下需要多台光源进行检测的弊端,降低了工业化气体检测的成本。系统以放大自发辐射(ASE)光源为基础,结合锯齿波(STW)驱动的可调谐法-珀(Fabry-Perot)滤波器形成窄带扫描光源。针对可调谐滤波器的电容特性会引起锯齿波驱动失真的现象,提出了采用并联谐振回路的方案来解决锯齿波驱动失真的问题,保障了扫描光源工作的稳定性。实验结果表明,在乙炔和氨气混合气体的环境下,本系统可以实现对不同组分气体浓度的同时检测,检测结果误差较小。
A fiber optic gas sensing system based on narrowband scanning light source is proposed. The system can be in a variety of gas coexistence environment, to complete the concentration of different components of the gas detection. The utility model overcomes the defects of traditional optical fiber gas sensor system that multiple light sources need to be tested under the condition that multiple gases coexist, and reduces the cost of industrial gas detection. Based on an amplified spontaneous emission (ASE) light source, the system combines a sawtooth wave (STW) driven tunable Fabry-Perot filter to form a narrowband scanning light source. In view of the tunable filter capacitor characteristics will cause the phenomenon of sawtooth driving distortion, the proposed parallel resonant circuit solution to solve the problem of sawtooth driving distortion to ensure the stability of the scanning light source. The experimental results show that under the environment of mixed gas of acetylene and ammonia, the system can detect the gas concentrations of different components simultaneously, and the error of the test results is small.