Dissolved gas sensing using an anti-resonant hollow core optical fiber.
Dissolved gas sensing using an anti-resonant hollow core optical fiber.
复制标题
使用反谐振空芯光纤进行溶解气体传感。
作者：
J. Kapit;A. Michel
环境、工业和生物医学应用都需要直接测量溶解气体的传感器。在这里，我们提出了一种空心芯光纤传感器，能够测量溶解在液体中的甲烷气体，仅使用纳升样品气体。该传感器基于抗谐振空心芯光纤，结合可渗透的毛细管膜入口，从液体中提取气体进行分析。由于分析所需的样品气体很少，因此只能使用小型毛细管入口进行气体提取，并且它在简单，坚固和紧凑的传感器配置中为溶解气体分析提供了新的可能性。我们演示了使用波长调制光谱的传感技术，并测量溶解在水中的甲烷，检测限低1σ为230 ppb，分辨率为45 ppb，响应时间为~ 8min。
Sensors that measure dissolved gases directly are needed for environmental, industrial, and biomedical applications. Here we present a hollow core fiber optic sensor capable of measuring dissolved methane gas in liquids using only nanoliters of sample gas. The sensor is based on an anti-resonant hollow core fiber combined with a permeable capillary membrane inlet that extracts gas from the liquid for analysis. Using a small capillary inlet for gas extraction is only possible due to the small amount of sample gas needed for analysis, and it presents new possibilities for dissolved gas analysis in a simple, robust, and compact sensor configuration. We demonstrate the sensing technique using wavelength modulation spectroscopy and measure methane dissolved in water with a 1σ lower detection limit of 230 ppb, a resolution of 45 ppb, and a response time of ∼8min.