Commonly Used Sensors Designed for Electronic Noses

Disruptive technological advancement waves in the areas of cloud, artificial intelligence (AI), and the Internet of things (IoT) created a positive impact and the demand for the technology used for electronic noses. These e-noses provide external benefits to various commercial industries, agriculture, biomedical, cosmetics, environment, food & beverage, and various research & scientific fields. Electronic noses are instruments that attempt to mimic the human olfactory system with an array of chemical sensors designed to detect either gases or vapors. Due to continuing improvements in gas sensor technologies and falling manufacturing costs, the e-nose market is expected to reach over $17.9M by 2025. [1] Working Principle The instrument essentially consists of sensor arrays, pattern recognition modules, and a headspace sampling unit to generate signal patterns used to characterize smells. Therefore, it can be classified into three major parts: detecting system, computing system, and sample delivery system. The air sample is pulled by a vacuum pump and led through a tube into a smaller chamber consisting of an electronic sensor array. Then the sample delivery system first enables the generation of the headspace of samples or volatile compounds that are fractionally analyzed there and sends the samples to the detection system. The detection system consists of a group of sensors that contact the volatile compound samples and reacts with the sensors causing electrical changes. These electrical changes are digitally transmitted into the computing system for data analysis. Commonly Used Sensors The digital output generated by electronic nose sensors is analyzed and interpreted, and the values are shown in the display based on the results. The most important component in the construction of e-noses is the sensor, and the commonly used sensors include:

• Metal oxide semiconductor (MOSFET), where the molecules entering sensor areas will be charged positively or negatively, will directly affect the electric field inside MOSFET.
• Metal oxide sensors absorb gas molecules to provoke a change in conductivity, and the change is measured for the number of volatile compounds and adsorbed.
• Piezoelectric sensors adsorb gas molecules on the surface of the polymer that leads to the change in the mass on the sensor surface, which in turn produces a change in the resonant frequency of the crystal.

What’s the Future? The recent convergence of ICT and biotechnology has led to an increasing number of areas where machines take over what people used to do. The electronic nose is one such technology that’s being used in both primary and secondary care. The future is directing it towards personalized healthcare to provide non-invasive means of diagnosing and monitoring health. Nano-composite sensors and advanced pattern recognition algorithms are used to detect chronic obstructive pulmonary diseases and other medical conditions, as well as industrial & agri-tech applications relating to quality control or contamination detection. Backed by 40 Years of Expertise We contribute our 40 years of design and manufacturing expertise spanning multiple diverse markets. We look forward to discussing how we can deliver world-class products for OEMs across the globe. We understand our home Indian market, familiar with its vast regulatory and selling environments. We foster growth opportunities within India through our strong technology incubation ecosystem. We also assist global OEMs in entering the Indian market by leveraging the local supply chain and favorable operating environments for cost reductions. Our flagship Chennai location opened in 2006 and lies within a Special Economic Zone (SEZ) for electronics manufacturing, offering economic incentives for imports and exports. This primary facility is within 90 minutes of the Chennai seaport and 20 minutes to the international airport. Additional road and rail connectivity links to the rest of India and beyond and infrastructure advantages with faster import and export clearances. We also have labor force flexibility, both technical and manual, to scale to demand rapidly. To learn more about this topic, please contact us.