Yang Dexun, Nie Qilu, Cheng Mengen, Pei Shilong, Cheng Cheng, Guo Donglai, Yang Minghong
National Engineering Research Center of Fiber Optic Sensing Technology and Networks, Wuhan University of Technology, Wuhan 430070, China.
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
ACS Sens. 2025 Feb 28;10(2):1113-1122. doi: 10.1021/acssensors.4c02954. Epub 2025 Jan 30.
This paper presents a compact all-fiber multicomponent gas Raman probe using a dual-fiber architecture within a platinum-coated capillary. The probe eliminates the need for conventional optical components like filters and dichroic mirrors by strategically employing metal coating on the excitation fiber's surface to suppress interference signals. A detailed analysis of the silica Raman signal and fluorescence propagation within the system facilitated this design. Metal-coated capillary (MCC), produced via atomic layer deposition (ALD) of platinum on silica capillaries, exhibits excellent optical properties and environmental resilience, boosting gas Raman signal reception. Careful alignment of the dual fibers relative to the platinum-coated capillary optimizes signal-to-noise ratio enhancement. The system achieves detection limits of 21 ppm for CH, 30 ppm for CH, and 51 ppm for CH within 45 s of exposure, alongside a rapid response time of 25 s (relative to systems based on hollow-core antiresonant fibers) and robust stability. Its streamlined optical path and compact design enhance practicality across diverse fields, including agriculture, industry, environmental monitoring, and healthcare, advancing multicomponent gas detection technology.
本文介绍了一种紧凑的全光纤多组分气体拉曼探头，它在镀铂毛细管内采用双光纤结构。该探头通过在激发光纤表面巧妙地采用金属涂层来抑制干扰信号，从而无需使用滤光片和二向色镜等传统光学元件。对系统内二氧化硅拉曼信号和荧光传播的详细分析促成了这一设计。通过在二氧化硅毛细管上进行铂的原子层沉积（ALD）制备的金属涂层毛细管（MCC）具有出色的光学性能和环境耐受性，增强了气体拉曼信号接收。双光纤相对于镀铂毛细管的精心对准优化了信噪比增强效果。该系统在45秒的曝光时间内实现了对CH的检测限为21 ppm、对CH的检测限为30 ppm以及对CH的检测限为51 ppm，同时响应时间快至25秒（相对于基于空心反谐振光纤的系统）且稳定性强。其简化的光路和紧凑的设计提高了在农业、工业、环境监测和医疗保健等不同领域的实用性，推动了多组分气体检测技术的发展。
