University of Twente Student Theses


The bug zapper

Ouderaa, M. van der and Laar, R. van (2013) The bug zapper.

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Abstract:In this project the goal was to make a bug zapper which can localize a sound source by means of phase difference detection in the measured sound waves at different positions in space and shoot a laser at this source. The sound source localization is done by using five microphones of which one is a reference. A TDOA is detected by cross correlation and peak detection of the measured signals of one of the four microphones with the reference. This TDOA is used to calculate the DDOA and then the sound source localization is calculated by a linear closed loop algorithm. We did not manage to implement a laser into the system but a laser can be implemented with a galvano mirror. The sound source localization works with measuring repeatability of 0.75 cm and localizes the sound source within 2.5 cm error for 11 out of 24 measured locations. This is not accurate enough to realize a bug zapper with minimum measuring repeatability and sound source localization error of 0.3 cm. The difference in measured and desired sound source locations is due to errors in calculating the TDOA’s, inaccurate measurements of the positions of the microphones, false assumptions made on the sound source and inaccurate measurements of the temperature.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics BSc (56962)
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