Electronic noses بینی الکترونیکی

Compared with dogs, people aren't very good at identifying smells. So, chemists are designing sensors—electronic noses—that help people do this job better.
Electronic noses can go where human noses shouldn't. For example, some electronic noses can sense substances that would be harmful to humans. Other electronic noses can sense chemicals that people can't detect at all. One such device looks a bit like a computer chip covered with neat rows of dots. Each dot contains a chemical dye. "We use anywhere from 20 to 36 different dyes that change color depending on what chemical they're exposed to," says Ken Suslick. He's a chemist at the University of Illinois.
Electronic noses can also alert people to hazards. On the space shuttle or in the International Space Station, for example, a chemical leak could mean a problem with the spacecraft or danger for the crew. Detecting such leaks promptly is essential.
But even this sensitive space sensor can't compete with a dog's amazing ability to detect and identify smells. Electronic noses still have a long way to go to top a dog's sniffer.