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.

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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.

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These devices also offer advantages, such as easy installation at a lower cost than wired devices and the ability to create a network of sensors. They also provide continuous, cost-effective, and reliable monitoring of remote locations. The adoption of wireless devices in developed regions is especially high in the automotive, environmental, industrial, and medical sectors. In 2018, Europe dominated the global market for sensors due to its increased IT investments and advancements in new technologies. However, Asia Pacific is expected to soon lead the gas sensors market since more consumer electronics, like tablets and wearables, will soon be integrated with these types of sensors.

Gas Sensor Applications [2]

• Automotive: The government’s increased focus on energy efficiency and emission control standards has resulted in the new usage of these devices in the automotive sector.
• Consumer: Demand for devices that can be integrated into handheld devices has encouraged advancements in technology. The market is projected to expand further on account of the rising need for ensuring safety at workplaces.
• Industrial: Indoor and outdoor air quality concerns are driving the use of gas sensors in building automation. Sensors are expected to have a high demand for HVAC control systems as they facilitate intelligent ventilation control. They’re also used for monitoring controlled combustion in industrial furnaces and measuring oxygen levels in confined spaces.
• Medical: These devices are primarily used for measuring volatile organic compounds, which may have adverse short-term and/or long-term health effects. For instance, they monitor the concentration of oxygen in anesthesia gas in incubators and ventilators. They’re also often integrated into medical equipment, such as breath monitoring systems, humidified oxygen heaters, life-supporting implants, oxygen concentrators, and temperature monitoring & control equipment.
• Petrochemical: Gas detection equipment is widely used in petrochemical applications to detect and monitor combustible and toxic gases. Many different types of sensors are used since each flammable gas requires a specific type of sensor to be accurately measured.

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.

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