Pico-Light H2O: balloon-borne experiments, atmospheric water vapor measurements, flight of 19 February 2019

Pico-SDLA (Spectromètre à Diode Laser Accordable) is an hygrometer developed to measure in situ water vapour, CO2, and methane under small balloons. Is a smaller/lighter version of the former instruments SDLA and micro-SDLA. The main difference with its predecesors is that it uses a one-meter long path for the open cell. The H2O version uses two different spectral lines (the more intense line is chosen for the stratosphere) to perform measurement up to 25 km.