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Electronic Nose

Electronic Nose

In much the same way as dogs with their keen sense of smell can be trained to detect odors, electronic devices can be built to perform this same task. “Electronic sensing” technology has applications in quality control, health care, crime and safety, and environmental monitoring. In health care, we are seeing new innovations in technology that may be able to sniff out disease including cancer, colon cancer, diabetes, Crohn’s disease, preeclampsia, and kidney disease.  In many cases there are molecules in the patient’s breath that can be detected with the electronic nose. These new technologies are accurate and provide non-invasive detection of disease.

Some electronic nose applications currently on the market:

Electronic noses include three major parts: a sample delivery system, odor detecting sensors, and pattern recognition system. The most commonly used sensors for electronic noses include liquid or gas chromatography and mass spectrometery.


Chips That Enable Electronic Nose Applications and Devices

Common sensors for key air quality and environmental parameters such as humidity, temperature, volatile organic compounds (VOCs), particulate matter (PM2.5), and CO2.

There are a variety of chemical and gas sensors with various methods of measurement. Electrochemical sensors are the most common approach, and operate by reacting with the chemical being sensed and producing an electrical signal that is proportional to the chemical concentration.  Some measure voltage while others measure current or resistivity.

Other gas sensors

Acid Gasses
Acetic Acid
Acetylene
Alcohol
Ammonia
Arsine
Bromine
Carbon Dioxide
Carbon Monoxide
Chlorine
Chlorine Dioxide
Diborane
Dimethylamine
Ethylene Oxide
Fluorine
Formaldehyde
Germane
HydroCarbons
Hydrogen
Hydrogen Bromide
Hydrogen Chloride
Hydrogen Cyanide
Hydrogen Fluoride
Hydrogen Peroxide
Hydrogen Selenide
Hydrogen Sulfide
Iodine
Methane
Nitric Oxide
Nitrogen Dioxide
Nitrogen Oxides
NMHC
Oxygen
Ozone
Peracetic Acid
Perchloroethelyne
Phosgene
Phosphine
Silane
Sulfur Dioxide
VOC
Additional articles

Photo source: Teguh Mujiono

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