电子鼻可能成为下一件日常设备

Researchers at the Texas Analog¹ Center of Excellence² (TxACE) at UT Dallas are working to develop an affordable³ electronic nose that can be used in breath analysis for a wide range of health diagnosis⁴. While devices that can conduct breath analysis using compound semiconductors⁵ exist, they are bulky and too costly⁶ for commercial use, said Dr. Kenneth O, one of the principal investigators⁷ of the effort and director of TxACE. The researchers determined⁸ that using CMOS integrated circuits technology will make the electronic nose more affordable. 

 

CMOS is the integrated circuits technology used to manufacture the bulk of electronics that have made smartphones, tablets and other devices possible. 

 

The new research was presented Wednesday in a paper titled "200-280GHz CMOS Transmitter for Rotational⁹ Spectroscopy and Demonstration¹⁰ in Gas Spectroscopy and Breath Analysis" at the 2016 IEEE Symposia¹¹ on VLSI Technology and Circuits in Honolulu, Hawaii. 

 

"Smell is one of the senses of humans and animals, and there have been many efforts to build an electronic nose," said Dr. Navneet Sharma, the lead author of paper, who recently defended his doctoral thesis at UT Dallas. "We have demonstrated that you can build an affordable electronic nose that can sense many different kinds of smells. When you're smelling something, you are detecting chemical molecules¹² in the air. Similarly, an electronic nose detects chemical compounds using rotational spectroscopy." 

 

The rotational spectrometer generates and transmits electromagnetic waves over a wide range of frequencies, and analyzes¹³ how the waves are attenuated¹⁴ to determine what chemicals are present as well as their concentrations in a sample. The system can detect low levels of chemicals present in human breath. 

 

Breaths contain gases from the stomach and that come out of blood when it comes into contact with air in the lungs. The breath test is a blood test without taking blood samples. Breath contains information about practically every part of a human body.

 

The electronic nose can detect gas molecules with more specificity and sensitivity than Breathalyzers, which can confuse acetone for ethanol in the breath. The distinction is important, for example, for patients with Type 1 diabetes¹⁵ who have high concentrations of acetone in their breath.

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