Abstract: The present invention relates to a method and device for packaging dry ice in a plastic film, the said device comprising: —means for dispensing and shaping a plastic film comprising a shaping sleeve over the exterior wall of which the plastic film is paid out, —a dry ice generator connected to a source of liquid carbon dioxide, the dry ice generator being positioned inside the shaping sleeve so as to leave a gap between the generator and the shaping sleeve and allow the plastic film shaped to become filled with dry ice, —and means for sealing the shaped plastic film, characterized in that the shaping sleeve is equipped with thermal insulating means and/or with heating means.

Abstract: Fully optical device for breaking down the dynamic range of an optical signal and system for measuring the signal, using this device. This device comprises fully optical means to break down this dynamic range.