“…Great efforts have been made to generate consistent vapors of various compounds for landmine determination [215], environmental chemical monitoring [216], explosives detection [217][218][219][220] and sensor calibration [221] throughout the past decades. One technique such as Controlled Odor Mimic Permeation Systems (COMPS) uses a thin plastic film to release vapors generated from the solid compounds into the headspace at a fixed rate [11,222].…”