Australian Centre for Research on Separation Science (ACROSS) and School of Physical Sciences University of Tasmania, Private Bag 75, Hobart, 7001, Australia; Institute for Sustainable Industries and Liveable Cities, Victoria University, Footscray Park Campus, Melbourne, Victoria, 3011, Australia.
Australian Centre for Research on Separation Science (ACROSS) and School of Physical Sciences University of Tasmania, Private Bag 75, Hobart, 7001, Australia.
Talanta. 2020 Oct 1;218:121144. doi: 10.1016/j.talanta.2020.121144. Epub 2020 May 17.
We designed a simple, portable, low-cost and low-weight nondispersive infrared (NDIR) spectroscopy-based system for continuous remote sensing of atmospheric methane (CH) with rapidly pulsed near-infrared light emitting diodes (NIR LED) at 1.65 μm. The use of a microcontroller with a field programmable gate array (μC-FPGA) enables on-the-fly and wireless streaming and processing of large data streams (~2 Gbit/s). The investigated NIR LED detection system offers favourable limits of detection (LOD) of 300 ppm (±5%) CH,. All the generated raw data were processed automatically on-the-fly in the μC-FPGA and transferred wirelessly via a network connection. The sensing device was deployed for the portable sensing of atmospheric CH at a local landfill, resulting in quantified concentrations within the sampling area (ca 400 m) in the range of 0.5%-3.35% CH. This NIR LED-based sensor system offers a simple low-cost solution for continuous real-time, quantitative, and direct measurement of CH concentrations in indoor and outdoor environments, yet with the flexibility provided by the custom programmable software. It possesses future potential for remote monitoring of gases directly from mobile platforms such as smartphones and unmanned aerial vehicles (UAV).
我们设计了一种简单、便携、低成本、低重量的非分散型红外（NDIR）光谱仪系统，用于使用近红外发光二极管（NIR LED）在 1.65μm 处对大气甲烷（CH）进行连续远程感应。使用带有现场可编程门阵列（μC-FPGA）的微控制器可以实现数据流的实时、无线流式传输和处理（~2Gbit/s）。所研究的 NIR LED 检测系统提供了有利的检测限（LOD），其检测 300ppm（±5%）CH 的限为 300ppm（±5%）CH。所有生成的原始数据都在μC-FPGA 中实时自动处理，并通过网络连接无线传输。该感应设备用于在当地垃圾填埋场进行便携式大气 CH 感应，在采样区域（约 400m）内产生的定量浓度在 0.5%-3.35% CH 范围内。该基于 NIR LED 的传感器系统为在室内和室外环境中连续实时、定量、直接测量 CH 浓度提供了一种简单的低成本解决方案，同时还提供了定制可编程软件提供的灵活性。它具有未来从智能手机和无人机等移动平台直接远程监测气体的潜力。
