Multi-Parameter Optical Fiber Sensing of Gaseous Ammonia and Carbon Dioxide
Multi-Parameter Optical Fiber Sensing of Gaseous Ammonia and Carbon Dioxide
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DOI：
10.1109/jlt.2019.2953271
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发表时间：
2020-04-01
影响因子：
4.7
通讯作者：
Korposh, Serhiy
中科院分区：
文献类型：
--
作者：
Liu, LiangLiang;Morgan, Stephen P.;Korposh, Serhiy
氨（NH3）和二氧化碳（CO2）是诊断肾脏和呼吸系统疾病的重要呼吸生物标志物。同时感测两种气体可用于评估幽门螺杆菌感染。本文介绍了一种涂有两种不同染料的多参数光纤传感器，将百里酚蓝和四苯基卟啉四硫酸水合物（TPPS）引入到一个光纤传感系统中，用于两种气体的多传感。使用溶胶-凝胶技术将染料分别涂覆在2 × 2光纤耦合器的远端上。反射光谱在波长域中包含两种染料的独特吸收峰，因此可以使用单个光谱仪进行分析。当CO2浓度从0 ppm增加到60 000 ppm时，百里酚蓝在608 nm处的吸收峰的吸光度呈指数下降。在约490 nm和711 nm处的吸收带分别对应于TPPS的Soret带和Q带，显示出响应于0 ppm至80 ppm范围内的NH3浓度的吸光度和中心波长的变化。对CO_2和NH_3的检测限和响应时间分别为637 ppm和0.15ppm，86 s和83 s。所提出的传感器证明了在含有其他化学物质（如甲醇和丙酮）的复杂气体气氛中同时感测NH3和CO2的能力，这些化学物质是可能混淆测量的工业或代谢化合物的代表。
Ammonia (NH3) and carbon dioxide (CO2) are important breath biomarkers for diagnosis of renal and respiratory diseases. Simultaneous sensing of the two gases is useful for assessment of Helicobacter Pylori infection. This article introduces a multi-parameter optical fibre sensor by coating two different dyes, i.e., thymol blue and tetraphenylporphyrin tetrasulfonic acid hydrate (TPPS) into one optical fibre sensing system for multi-sensing of the two gases. The dyes are separately coated on distal ends of a 2 x 2 optical fibre coupler using the sol-gel technique. The reflection spectrum contains distinctive absorption peaks of the two dyes in the wavelength domain and hence can be analysed using a single spectrometer. The absorbance at a wavelength of 608 nm corresponding to the absorption peak of the thymol blue exhibits an exponential decrease as the CO2 concentration increases from 0 ppm to 60 000 ppm. The absorption bands at approximately 490 nm and 711 nm corresponding to the Soret band and Q-band of TPPS, respectively, show changes both in absorbance and central wavelengths in response to NH3 concentration in the range from 0 ppm to 80 ppm. The limit of detection and response time for CO2 and NH3 are 637 ppm and 0.15 ppm, 86 s and 83 s, respectively. The proposed sensor demonstrates the capability of sensing NH3 and CO2 simultaneously in a complex gas atmosphere containing other chemicals such as methanol and acetone, which are representative of industrial or metabolic compounds that may confound measurements.