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Devices that detect potentially hazardous gases or airborne environmental pollutants are out there.
雖然有能夠檢測潛在有害氣體或空氣中環境污染物的設備。
But they're expensive and bulky.
但它們一直價格昂貴而且體積笨重
Now M.I.T. researchers say they've developed a way to get the same detection abilities—with your smartphone.
而現在麻省理工學院的研究人員們已經研發出了一種同樣能夠進行檢測的方法—那就是利用智能手機。
The research team modified what are called near-field communication tags, or NFC tags.
這個研究小組修改了被稱為近場通信標簽的NFC標簽。
Smartphones with NFC capabilities send out magnetic field pulses.
具有NFC功能的智能手機會發出磁場脈沖。
The magnetic field creates an electric current on the tag that the phones pick up.
而這種磁場會在手機接收的標簽上產生電流。
Such systems are typically used to track products or drugs.
這樣的系統通常用于追蹤產品或藥物。
For the new application, the scientists added links to the circuit made of carbon nanotubes.
而對于這樣一款新應用程序，科學家們在碳納米管制成的電線回路加上了鏈接。
Each link responds to one particular gas, by changing how the nanotubes conducts electricity.
通過改變納米管的導電方式，每個鏈接都對應一種特定氣體。
By sensing the change in electric current on the tag,the smartphone signals that it has detected the gas in question.
通過感應標簽上的電流變化，智能手機信號就會檢測到問題氣體。
The method was tested with ammonia, cyclohexanone and hydrogen peroxide.
這種方法已經經過氨氣，環己酮及過氧化氫的檢驗。
And the tags could sense the substances at levels of a few parts per million.
而且這些標簽可以在每百萬的極少物質中感應到問題物質。
The research is in the Proceedings of the National Academy of Sciences.
這項研究已經在《美國國家科學院院刊》上發表。
Such inexpensive tiny tags require no external power.
這種廉價的小標簽不需要外部電力。
The scientists say their NFC tag system has the potential to be widely used to monitor gases that can affect health, safety and the environment.
科學家們表示他們所研發的這種NFC標簽系統可能在未來會被廣泛用于監測影響健康、安全和環境的氣體。
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