State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China.
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China.
Talanta. 2020 Jun 1;213:120841. doi: 10.1016/j.talanta.2020.120841. Epub 2020 Feb 14.
By feeding back the reflected light from the first cavity mirror to a single-/multi-pass gas cell via a multi-mode fiber, we demonstrated a novel gas-phase analytical scheme for methane (CH) detection by combing fiber-coupled off-axis integrated cavity output spectroscopy (FC-OA-ICOS) and cavity-reflected wavelength modulation spectroscopy (CR-WMS). This scheme has an electrical module and two optical sensing modules which are connected through both single- and multi-mode optical fibers. Long-distance gas sensing application was conducted for verifying the analytical ability of the demonstrated technique exploiting the two fiber-coupled optical modules. A detection limit of 3 parts-per-million in volume (ppmv) for an 84 s averaging time and a precision of 56 ppmv for a 150 s averaging time were achieved using FC-OA-ICOS and CR-WMS, respectively. Two different CH measurement ranges were achieved in the sensor system with a wide dynamic range from ~15 ppmv to ~12% for CH detection. Field monitoring of CH leakage was performed for environmental analysis under a static and mobile mode using the wireless-controlled vehicle-mounted gas sensor. The proposed gas sensing scheme with fiber-coupled dual optical modules demonstrates a good potential for long-distance field CH measurements, especially for those in hazardous environment where in-situ human observation is impossible.
通过将第一腔镜反射的光通过多模光纤反馈到单/多通气体池，我们展示了一种新颖的基于光纤耦合离轴集成腔输出光谱（FC-OA-ICOS）和腔反射波长调制光谱（CR-WMS）的甲烷（CH）检测气相分析方案。该方案具有一个电气模块和两个光学传感模块，它们通过单模和多模光纤连接。通过利用两个光纤耦合光学模块，进行了长距离气体传感应用，以验证所展示技术的分析能力。使用 FC-OA-ICOS 和 CR-WMS 分别实现了 84 秒平均时间的 3 百万分率（ppmv）的检测限和 150 秒平均时间的 56 ppmv 的精度。该传感器系统实现了两种不同的 CH 测量范围，具有从15 ppmv 到12%的宽动态范围，用于 CH 检测。使用无线控制车载气体传感器在静态和移动模式下进行了 CH 泄漏的现场环境分析。具有光纤耦合双光学模块的提议气体传感方案展示了用于长距离现场 CH 测量的良好潜力，特别是在原位人员观察不可能的危险环境中。
