Distinguish Sea Turtle and Fish Using Sound Technique in Designing Acoustic Deterrent Device
Abstract: Acoustic is a common
method for underwater object classification and to observe fish schools or
other marine animals in their environment, but it was never applied on sea
turtle. Knowledge about turtle detection using sound is very limited and there
are no target strength (TS) recorded before. In this study, an echo voltage
reference methodincorporating standard target was used to measure ex situ
target strength of two Green Turtle (Chelonian mydas) and three species of fish
(Indian scad, Indian Mackerel and Bigeyescad). The echo signal of animals has
been observed from echosounder output and every envelope of the echo was
digitized at a sampling rate 1MHz using high speed analog to digital converter
(USB‑1208HS). The finding shows a significant difference between fish and
turtles aged 18 years old. The result also demonstrates that TS increase
as age of turtle increase. This result is considered important in designing an
acoustic deterrent device. The result reveals that size, surface, and animal
body part influence in determining target strength value.
Author: Azrul Mahfurdz,
Sunardi Sunardi, H. Ahmad, Syed Abdullah, Nazuki
Journal Code: jptkomputergg150133
