Detection and Classification of Human Body Odor Using an Electronic Nose

Abstract

An electronic nose (E-nose) has been designed and equipped with software that can detect and classify human armpit body odor. An array of metal oxide sensors was used for detecting volatile organic compounds. The measurement circuit employs a voltage divider resistor to measure the sensitivity of each sensor. This E-nose was controlled by in-house developed software through a portable USB data acquisition card with a principle component analysis (PCA) algorithm implemented for pattern recognition and classification. Because gas sensor sensitivity in the detection of armpit odor samples is affected by humidity, we propose a new method and algorithms combining hardware/software for the correction of the humidity noise. After the humidity correction, the E-nose showed the capability of detecting human body odor and distinguishing the body odors from two persons in a relative manner. The E-nose is still able to recognize people, even after application of deodorant. In conclusion, this is the first report of the application of an E-nose for armpit odor recognition.

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“…Recently, evaluation of body odor strength based on isovaleric acid solutions as prepared according to the intensity scale can also be performed using gas sensor array in stead of the www.intechopen.com human nose (Wongchoosuk et al, 2009a). The response of a gas sensor array to the isovaleric acid is displayed in Fig.…”

“…7. Logarithmic plot of the sensor response to isovaleric acid at different intensity level (Wongchoosuk et al, 2009a).…”

Security System with Three Way Authentication

“…"Detection and Classification of Human Body Odor Using an Electronic Nose" proposes each human being has a unique odor [8].…”

“…The E-nose [8] also known as the electronics nose is used to detect the unique odor from each human. This sensor produces a binary value which can be used for verification of the genuine user.…”

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“…Electronic noses have been used to identify human beings from their body odor [74]. Although individuality in body odors has been described in a variety of mammals [75], the electronic noses which have been designed so far for animal studies mainly focus on purposes other than identification, such as controlling gas level around farms.…”