A portable E-nose system for classification of Chinese liquor

In this paper, a portable electronic nose (e-nose), being highlighted with high speed and portability, was developed to classify Chinese liquor. It consisted of sampling module, gas chamber and ARM processor. First, two cascaded chambers wrapped with thermostat (Silicone heating band) were designed, one for rapid evaporation, and the other for reaction of the liquor samples. Then a novel bio-inspired segmented breathing sampling method was proposed, which can notably enrich the available dynamic information in limited time. Consequently, by taking the advantage of fast online algorithm, one test process was limited in 4.5 minutes, including sample evaporation, sequential sampling, data output and cleanout. Besides, the developed e-nose was easily carried (1.9 Kg including battery). To examine the performance of the e-nose, six kinds of Chinese liquors were tested (each for 20 times) using optimized support vector machine (SVM), and the accuracy rate was 90.8%.