OFCEAS: balloon-borne experiments, atmospheric compounds measurements, flight of 20 April 2011

OFCEAS (Optical Feedback Cavity Enhanced Spectroscopy): in situ compact analyzer working with a DFB diode laser at 2325 nm, capable of CO and CH4 simultaneous measurements down to 1 pbbv concentration levels at 1 Hz. The high finesse cavity allows effective path lengths of the order of 10 km with a 50 cm long cell (20 cm3 internal sample volume). Local air is flown through this cavity, delay from sample inlet is known from flow rate. Automatic continuous measurement from ground to ceiling and back, with logging on flashdisk.
This flight is involved in the ENRICHED campaign.