【摘要】 研究开发了一种基于指示剂的二氧化碳光纤化学传感器,采用具有高气体可透过性和低折射率的无定型聚四氟乙烯(Teflon AF)材料作为液芯波导管,高灵敏度微型CCD分光光度计作为检测器,溴百里酚蓝(BTB,bromothymol blue)和Na2CO3为指示剂缓冲溶液。在0～194 ppm的CO2浓度范围内,传感器最佳精度为±1.21ppm,响应时间(99％)约为2 min。传感器具有体积小,能耗低等特点,适于现场长期自动监测。更多还原

【Abstract】 A reagent based CO2 fiber optical chemical sensor was developed. The sensor utilizes a Teflon AF tubing with high gas-permeability and low refractive index as a liquid core waveguide. A high sensitivity micro CCD spectrophotorneter was used as a detector, and BTB (bromothymol blue) dissolved in aqueous HCO3- /CO32- was applied as indicator-buffer solution. The sensor is able to achieve a precision of± 1.21 ppm in a xCO2 range of 0 - 194 ppm, and a response time (99 %) of 2 min.更多还原