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Infrared overtone spectroscopy measurements of ammonia and carbon dioxide in the effluent of a biological water processor

机译：生物水处理器流出物中氨和二氧化碳的红外线泛孔光谱测量

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NH{sub}3 and CO{sub}2 concentration measurements performed on a Biological Water Processor (BWP), under development at NASA-JSC for water recycling, using near infrared laser diode absorption spectroscopy are reported. The gaseous effluents from the bioreactor are a concern for potentially introducing harmful amounts of NH{sub}3 in a spacecraft environment. Furthermore, NH{sub}3 and CO{sub}2 monitoring is important for understanding the nitrogen and total organic carbon (TOC) balance and conversion dynamics in the BWP, and real time continuous monitoring could reveal dynamic situations that are hard to detect otherwise. Diode lasers operating at wavelengths that access NH{sub}3 and CO{sub}2 absorption lines near 1.53 mm and 1.99 mm are used in a portable and automated gas sensor system. Concentration measurements were performed during a 16-day period starting in August 25, 2000, and a 5-day period starting in November 10, 2000. A sensitivity of 0.7 ppm (signal to noise ratio -SNR- ～3) with a precision of 0.2 ppm will be reported for ammonia, and of 1000 ppm (SNR ～3) for CO{sub}2. Ammonia levels up to 5.6 ppm were observed, with fluctuating dynamics that depended upon the operating conditions of the bioreactor. Carbon dioxide levels fluctuated from 0.05% to 3.5%.
机译：报道了在NASA-JSC的生物水处理器（BWP）上进行的NH {亚} 3和CO·{SUB} 2浓度测量。使用近红外激光二极管吸收光谱，在NASA-JSC进行水循环的情况下进行。来自生物反应器的气态流出物是潜在地引入航天器环境中的有害量的NH {Sub} 3。此外，NH {sub} 3和CO {sub} 2监测对于理解氮气和总有机碳（TOC）平衡和转换动态，并且实时连续监测可以揭示难以检测的动态情况。在便携式和自动化气体传感器系统中使用以接近NH {Sub} 3和Co {Sub} 2的波长操作的二极管激光器，该吸收线用于便携式和自动化气体传感器系统中使用近1.53mm和1.99mm。在2000年8月25日开始的16天期间进行浓度测量，以及从2000年11月10日开始的5天的时间。0.7ppm（信噪比-snR-〜3）的灵敏度为精确度将报告0.2ppm的氨，以及CO {SUB} 2的1000ppm（SNR〜3）。观察到氨水量高达5.6ppm，具有波动的动态，依赖于生物反应器的操作条件。二氧化碳水平波动为0.05％至3.5％。

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