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A new non-resonant laser-induced fluorescence instrument for the airborne in situ measurement of formaldehyde

机译:一种新型的非共振激光诱导荧光仪,用于机载甲醛原位测量

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A new in situ instrument for gas-phase formaldehyde (HCHO), COmpact Formaldehyde FluorescencE Experiment (COFFEE), is presented. COFFEE utilizes non-resonant laser-induced fluorescence (NR-LIF) to measure HCHO, with 300?mW of 40?kHz 355?nm laser output exciting multiple HCHO absorption features. The resulting HCHO fluorescence is collected at 5?ns resolution, and the fluorescence time profile is fit to yield the ambient HCHO mixing ratio. Typical 1iσ/i precision at ?~??0?pptv HCHO is 150?pptv for 1?s data. The compact instrument was designed to operate with minimal in-flight operator interaction and infrequent maintenance (1–2 times per year). COFFEE fits in the wing pod of the Alpha Jet stationed at the NASA Ames Research Center and has successfully collected HCHO data on 27 flights through 2017 March. The frequent flights, combined with a potentially long-term data set, makes the Alpha Jet a promising platform for validation of satellite-based column HCHO.
机译:提出了一种新的气相甲醛原位测定仪,即紧密甲醛甲醛荧光实验(COFFEE)。 COFFEE利用非共振激光诱导荧光(NR-LIF)来测量HCHO,其300?mW的40?kHz 355?nm激光输出激发了多种HCHO吸收特性。以5?ns的分辨率收集所得的HCHO荧光,并调整荧光时间曲线以产生环境HCHO混合比。对于1?s数据,在?〜?0?pptv HCHO处典型的1 σ精度为150?pptv。这款紧凑型仪器的设计目的是使操作员在飞行中的互动降到最低,并且不需频繁维护(每年1-2次)。 COFFEE安装在位于美国国家航空航天局艾姆斯研究中心的Alpha Jet机翼吊舱中,并成功收集了截至2017年3月的27个航班的HCHO数据。频繁的飞行加上潜在的长期数据集,使Alpha Jet成为验证基于卫星的HCHO色谱柱的有希望的平台。

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