The gas generators for calibration based on the use of “Method of Permeation Tubes.”. The permeation tubes are sealed capsules containing a small amount of the component that is in contact with a permeable membrane stable. The permeation through the membrane produces a vapor of the compound of the component of small quantity, very stable as a stream in time. This permeate stream by mixing with a dilution gas controlled and precise (for example nitrogen) creates a mixture in track at the desired concentration. The flow of the permeate is measured metrically through severe weight loss of the tube thus ensuring a standard high precision.
By ETG Risorse e Tecnologia S.r.l. based in Montiglio, ITALY.
GeoVantage digital multispectral imaging enables large-scale environmental changes such as fire damage, flooding, erosion, or chemical spills, to be quickly located and quantified. Recurrent issues can be tracked over time by comparing imagery taken at different intervals. This approach allows for the most effective containment and solution planning.
GeoVantage customizes each imagery collection plan to optimize your environmental management objectives, including vegetation delineation, pervious/impervious mapping, water quality, and change detection.
By GeoVantage based in Peabody, MASSACHUSETTS (USA).
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