CAFE: a new, improved non-resonant laser-induced fluorescence instrument for...

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St. Clair, J. M., A. K. Swanson, S. A. Bailey, and T. F. Hanisco (2019), CAFE: a new, improved non-resonant laser-induced fluorescence instrument for airborne in situ measurement of formaldehyde, Atmos. Meas. Tech., doi:10.5194/amt-2019-153.
Abstract: 

NASA Compact Airborne Formadehyde Experiment (CAFE) is a non-resonant laser-induced fluorescence instrument for airborne in situ measurement of formaldehyde (HCHO). The instrument is described here with highlighted improvements from the predecessor instrument, COmpact Formaldehyde FluorescencE Experiment (COFFEE). CAFE uses a 480 mW, 80 kHz laser at 355 nm to excite HCHO and detects the resulting fluorescence in the 420-550 nm range. The fluorescence is acquired at 5 ns resolution for 500 ns and the unique time profile of the HCHO fluorescence provides measurement selectivity. CAFE achieves a 1s precision of 160 pptv (1 s) and 90 pptv (10 s) for [HCHO] = 0 pptv. CAFE has successfully flown on multiple aircraft platforms and is particularly well-suited to high altitude research aircraft or small air quality research aircraft where high sensitivity is required but operator interaction and instrument payload is limited.

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