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The NASA In Situ Airborne Formaldehyde (ISAF) instrument is ahigh-performance laser-based detector for gas-phase formaldehyde (HCHO). ISAFuses rotational-state specific laser excitation at 353 nm for laser-inducedfluorescence (LIF) detection of HCHO. A number of features make ISAF idealfor airborne deployment, including (1) a compact, low-maintenance fiberlaser, (2) a single-pass design for stable signal response, (3) astraightforward inlet design, and (4) a stand-alone data acquisition system. Afull description of the instrument design is given, along with detailedperformance characteristics. The accuracy of reported mixing ratios is±10% based on calibration against IR and UV absorption of a primaryHCHO standard. Precision at 1 Hz is typically better than 20% above100 pptv, with uncertainty in the signal background contributing most tovariability at low mixing ratios. The 1 Hz detection limit for asignal / noise ratio of 2 is 36 pptv for 10 mW of laser power, and the<i>e</i> fold time response at typical sample flow rates is 0.19 s. ISAF hasalready flown on several field missions and platforms with excellent results

A new airborne laser-induced fluorescence instrument for in situ detection of formaldehyde throughout the troposphere and lower stratosphere