Development of a customized gas sensor array for post harvest disease detection in onions during storage

Tharun Kumar Konduru, Changying Li, Glen Rains

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The shelf life of onions, which is one of the major vegetable crops in the world, is reduced mainly due to post-harvest diseases such as sour skin and botrytis neck rot. Recent studies have indicated the difference in the type and concentrations of the volatiles released by the healthy and sour skin infected and botrytis neck rot infected onions. To detect rotten onions in storage, a customized gas sensor array system was developed, which consists of five MOS (Metal Oxide Semiconductor) sensors that are sensitive to wide range of volatiles, electronic and mechanical components, and a specially designed sensor chamber. The chamber is attached with gas delivery system to deliver the volatiles from the onion samples to the chamber. The device is automated using a specially designed electronic circuit which comprises of a microcontroller (16F877A) that controls the functions of every component in the device. The microcontroller also transfers data between the device and PC. The automated electrochemical sensor was exposed to acetone (ketone), acetonitrile (nitrite), ethylacetate (ester) and ethanol (alcohol) to understand the range of each sensor's sensitivity to these compounds. Area under the curve, smellprint and slope features were extracted from the sensor's real time response to different concentrations (1ml, 2 ml and 3ml diluted to 50 ml of water) of four chemicals. Area under the curve and slope values were used to identify the concentration of each chemical and smellprint was used to classify the chemical.

Original languageEnglish
Title of host publicationAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012
PublisherAmerican Society of Agricultural and Biological Engineers
Pages2230-2240
Number of pages11
Volume3
ISBN (Print)9781622762088
Publication statusPublished - Jan 1 2012
EventAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012 - Dallas, TX, United States
Duration: Jul 29 2012Aug 1 2012

Other

OtherAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012
CountryUnited States
CityDallas, TX
Period7/29/128/1/12

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Bioengineering

Fingerprint Dive into the research topics of 'Development of a customized gas sensor array for post harvest disease detection in onions during storage'. Together they form a unique fingerprint.

  • Cite this

    Konduru, T. K., Li, C., & Rains, G. (2012). Development of a customized gas sensor array for post harvest disease detection in onions during storage. In American Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012 (Vol. 3, pp. 2230-2240). American Society of Agricultural and Biological Engineers.