#3 Lo que dice el artículo es lo contrario, que el hecho de simular la inspiración y expiración es lo que aumenta la eficiencia en la detección:
"Chemical sampling and detection experiments quantified two modes of operation with the artificial nose-active sniffing and continuous inspiration-and demonstrated an increase in odorant detection by a factor of up to 18 for active sniffing. A 16-fold improvement in detection was demonstrated with a commercially-available explosives detector by applying this bio-inspired design principle and making the device “sniff” like a dog."
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https://meneame.wikispaces.com/Comenzando