Design of biomimetic olfactory sensing system by implanted microelectrode array and its application in odor recognition

Mammalian olfactory system has merits of higher sensitivity, selectivity and faster response than current electronic nose system based on chemical sensor array in odor recognition. In order to discuss the feasibility of odor discrimination by odor sensing system, the microelectrode array was implanted into olfactory bulb of rats to record local field potential from mitral cell layer after stimulated by four odors including isobutanol, anisole, carvone and citral. The spectrograms using multitaper spectrum estimation and time-shift windows show relative high energy distribution in gamma band(40 Hz~120 Hz)after odor stimulus. A data set consists of 120 odor-induced spectrograms was used for odor classification by K-nearest neighbor method and the classification accuracy reached 77.4%. The result indicates that the olfaction based odor sensing system is capable of discriminating different odors.