Russian scientists have created ultra-precise and durable "electronic nose"
The sense of smell - a truly amazing feeling. It allows you to not only feel the smell, but at a fairly advanced receptors (eg, dogs) makes it possible to look for dangerous substances. Not the first day of scientists around the world are trying to recreate a highly sensitive nose in the form of an electronic device, and recently a group of Russian scientists managed to develop the most accurate to date an electronic nose.
Immediately it should be noted that the electronic nose is fundamentally different from the gas analyzers. The latter can only distinguish between certain substances, but their noses - a device for detecting a broad class of chemicals. They can not simply distinguish odors, but also to learn new thanks to machine learning.
"Training" electronic nose is almost indistinguishable from the dog training: a computer equipped with a sensor, demonstrated the desired odor, which is assigned to a specific designation in the database. Moreover, the stored "image" of the smell, and then it can not only be allocated in a number of others, but also is associated with like. If necessary, a new odor notes and made its comparison with similar, forming cross smells one species (e.g., flower scents). But unlike the "natural" electronic nose often "confused" outside the lab. As explained by one of the authors of Viktor Sysoev, professor of Saratov State Technical University,
"The fact is that the sensors are not stable, and time drift. Because sensors need a stable, avoiding drift. We have shown how to address this problem on an example of an electronic nose based on multisensor array of metal oxide. "
The usual high-sensitivity sensors based nanofibres can accurately detect smells just a couple of weeks, after which require recalibration. But experts from the CSTs have used a different approach.
"We found that the stability of the electronic nose depends mainly on random variations in the composition of the surrounding air, and enter the nasal additional training procedure ensures its stability for many years. Moreover, we are the first to demonstrate the device's ability to function for more than eight years. This result has not yet been demonstrated none of the created artificial noses ".
In the event that the final phase of testing is successful, scientists will be able to create a "perfect" electronic nose, which can be used for the analysis of gaseous media and identifying various odors.