Echo voltage reflected by turtle on various angles

Abstract

This research proposes the acoustic measurement by using echo sounder for Green turtle (Chelonia mydas) detection of 1 year, 12 and 18 years. Various positions or angles of turtles are head, tail, shell, lung, left and right side. MATLAB software is used to analyse the frequency and the response of the turtle as echo voltage and target strength parameters. Based on the experiment and analysis, the bigger size of the turtle give the higher echo voltage and target strength. The target strength of turtle for lung and shell for all ages are-26.52 dB and –26.17 dB respectively. The value of target strength of turtles in this research is different with fish in our previous research (-38 to-44 dB). Therefore, for future research, the repellant system based on differences of target strength the turtle and fish for avoids the turtle trapping in the net can be implemented to protect the population of turtle from extinction.