Application of Neuromorphic Olfactory Approach for High-Accuracy Classification of Malts

Abstract

Current developments in artificial olfactory systems, also known as electronic nose (e-nose) systems, have benefited from advanced machine learning techniques that have significantly improved the conditioning and processing of multivariate feature-rich sensor data. These advancements are complemented by the application of bioinspired algorithms and architectures based on findings from neurophysiological studies focusing on the biological olfactory pathway. The application of spiking neural networks (SNNs), and concepts from neuromorphic engineering in general, are one of the key factors that has led to the design and development of efficient bioinspired e-nose systems. However, only a limited number of studies have focused on deploying these models on a natively event-driven hardware platform that exploits the benefits of neuromorphic implementation, such as ultra-low-power consumption and real-time processing, for simplified integration in a portable e-nose system. In this paper, we extend our previously reported neuromorphic encoding and classification approach to a real-world dataset that consists of sensor responses from a commercial e-nose system when exposed to eight different types of malts. We show that the proposed SNN-based classifier was able to deliver 97% accurate classification results at a maximum latency of 0.4 ms per inference with a power consumption of less than 1 mW when deployed on neuromorphic hardware. One of the key advantages of the proposed neuromorphic architecture is that the entire functionality, including pre-processing, event encoding, and classification, can be mapped on the neuromorphic system-on-a-chip (NSoC) to develop power-efficient and highly-accurate real-time e-nose systems.

Three‐Terminal Artificial Olfactory Sensors based on Emerging Materials: Mechanism and Application

“…A series of events need to be complexly orchestrated to achieve this detection performance, starting from the quick and effective delivery of ligands to the sensing location and the detection of various ligands simultaneously until the formation and subsequent decoding of the neural-signal representation of the odor in the nervous system. [174][175][176] Electronic noses are typically comprised of a sensor array, transducer, which contains an ADC for pre-processing signal data, and a von Neumann processor. It is a novel system used to measure the chemical composition of gas and is designed similar to the biological olfactory system.…”