Wang Jianing, Li Bingqiang, Wu Weiping, Lin Guanyu
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Sensors (Basel). 2024 Mar 5;24(5):1670. doi: 10.3390/s24051670.
A greenhouse gas sensor has been developed to simultaneously detect multiple gas species within a hollow-core photonic bandgap fiber (HC-PBF) structure entirely composed of fibers. To enhance sensitivity, the gas cell consists of HC-PBF enclosed between two single-mode fibers fused with a reflective end surface to double the absorption length. The incorporation of side holes for gas diffusion allows for analysis of the relationship between gas diffusion speed, number of drilled side holes, and energy loss. As the number of drilled holes increases, the response time decreases to less than 3 min at the expense of energy loss. Gas experiments demonstrated detection limits of 0.1 ppm for methane and 2 ppm for carbon dioxide, with an average time of 50 s. In-situ testing conducted in rice fields validates the effectiveness of the developed gas detection system using HC-PBF cells, establishing all-fiber sensors with high sensitivity and rapid response.
一种温室气体传感器已被开发出来，用于在完全由光纤组成的空心光子带隙光纤（HC-PBF）结构内同时检测多种气体种类。为提高灵敏度，气室由夹在两根单模光纤之间的HC-PBF组成，单模光纤的一端熔接有反射面，以使吸收长度加倍。引入用于气体扩散的侧孔，有助于分析气体扩散速度、钻出的侧孔数量和能量损失之间的关系。随着钻出的孔数量增加，响应时间缩短至不到3分钟，但代价是能量损失。气体实验表明，甲烷的检测限为0.1 ppm，二氧化碳的检测限为2 ppm，平均时间为50秒。在稻田进行的现场测试验证了使用HC-PBF气室开发的气体检测系统的有效性，建立了具有高灵敏度和快速响应的全光纤传感器。
