Design and Development of a Low-cost Acoustic Device to Detect Pest Infestation in Stored Maize

Simple item page
dc.contributor.authorKiobia, Denis Olgenen
dc.contributor.committeechairMallikarjunan, Parameswaran Kumaren
dc.contributor.committeememberGrisso, Robert D.en
dc.contributor.committeememberTumbo, Siza D.en
dc.contributor.departmentBiological Systems Engineeringen
dc.date.accessioned2015-09-18T20:06:45Zen
dc.date.available2015-09-18T20:06:45Zen
dc.date.issued2015-09-17en
dc.description.abstractInsect damage in stored maize is one of the major post-harvest losses occurring in developing countries, especially in sub-Saharan Africa. To reduce economic losses, separation of infested grains from clean ones is critical and requires detection of infestation in stored grains. This study aimed at developing a rapid non-destructive detection system with three goals; - the first goal was to investigate the acoustic behavior of internally feeding S. zeamais (Coleoptera: Curculionidae) in maize. The pests were monitored for peak activity and signal amplitudes. The study was performed in the morning, afternoon and night times for three consecutive days with an ultrasonic probe attached to acoustic emission detector. The average number of peaks above threshold in the morning, afternoon and night was significantly different and were 60, 2 and 31 counts/s, respectively (P-value < 0.01). The average maximum amplitude was also different: 2.5, 1 and 1.8V for morning, afternoon and night sessions, respectively. The signal frequencies ranged between 1 and 15 kHz with a peak around 7 kHz. The second goal was to design and develop an inexpensive acoustic device for the detection of S. zeamais in the stored maize. This device included a microphone, signal conditioning circuit and a microcontroller. The third goal was to test the prototype in both clean and infested maize. The device could be manufactured for $55 or less. The device has a noise level below 0.2V in clean maize, infestation amplitude up to 1V and about 93.3% correct detection performance in infected maize.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:6321en
dc.identifier.urihttp://hdl.handle.net/10919/56588en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectSitophilus zeamaisen
dc.subjectmaize kernelen
dc.subjectacoustic sensoren
dc.subjectinfestationen
dc.subjectPost-harvest lossesen
dc.subjectstorage lossesen
dc.subjectTanzaniaen
dc.titleDesign and Development of a Low-cost Acoustic Device to Detect Pest Infestation in Stored Maizeen
dc.typeThesisen
thesis.degree.disciplineBiological Systems Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Kiobia_DO_T_2015.pdf
Size:
2 MB
Format:
Adobe Portable Document Format
Download

Collections

Masters Theses