These ultrafine particle sensors allow a radical improvement in air quality

To reduce certain risks of health problems, sensors allowing the detection of particles ultrafine have been developed. Despite the availability of these sensors in industries, several problems make their use difficult. As part of his doctorate, Tim Staples introduces new methods that could improve the development and use of these sensors.

Plasmas are made up of charged particles, and are used in systems industrial high technology such as photolithography equipment. By measuring the size and concentration of particles in these plasmas, Tim Staples indicates that it is possible to develop sensors of particles smaller and more durable in the future.

Furthermore, he presented the results of his research at the Department of Applied Physics on February 8. He was optimistic and sees his research as a starting point for the development of future particle sensors.

Are the financial and technical problems finally resolved?

Currently, a multitude of sensors industrial exist in the market. However, many problems prevent their daily use. First comes their cost, which represents a major obstacle. At 10,000 euros each, this device is quite expensive for most companies. What’s more, the absence of legislation on the particles ultrafine limits the use of this technology on a large scale.

There are also problems techniques that prevent widespread use. Indeed, the concentration of particles in the air is very low and difficult to measure. The material should therefore be more sensitive and capable of detecting the movements of these particles.

Particle charge measurement

As part of its research studies, Staples and his colleagues have developed a method to accurately measure the surface charge of particles anodized. it’s about the spectroscopy through resonance microphonewaveused since the 1950s for measure electrons free in vacuum gases.

The team of researchers then adapted this new method to use it under normal conditions of pressure atmospheric and density.

In a vacuum, electrons can travel several meters before colliding with a gas or a dust particle. Under normal conditions, this distance decreases considerably, and the signals produced when an electron strikes a gas or dust particle are much smaller than in a vacuum. We have therefore designed a new device that minimizes the effects of external vibrations. »



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