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理论分析了考虑吸收线型函数展宽时的Beer-Lambert定律,作了进一步推导并应用于多点乙炔气体监测。提出一种采用波分复用器、利用吸收峰区分不同传感点的多点光纤乙炔传感系统,系统简单易操作,无需对光源进行调制,且系统损耗与串扰小。理论分析表明当目标检测灵敏度为0.5%时,在1510~1540 nm范围内该系统最大可监测18个传感点。搭建了一个3个监测点的乙炔传感系统并验证了上述理论的可行性,各传感点的测量误差均小于1.8%。
The Beer-Lambert law is considered theoretically when broadening the absorption linear function, and further deduced and applied to multi-point acetylene gas monitoring. A multi-point optical fiber acetylene sensor system using wavelength division multiplexer to distinguish different sensing points by using absorption peak is proposed. The system is easy to operate and does not need to modulate the light source, and the system loss and crosstalk are small. Theoretical analysis shows that when the target detection sensitivity is 0.5%, the system can monitor up to 18 sensing points in the range of 1510 ~ 1540 nm. An acetylene sensing system was set up at three monitoring sites and the feasibility of the above theory was verified. The measurement error of each sensing point was less than 1.8%.