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2 Wahlberg, Axenrot and Balk 2005 A short study of Skeppsmask in a log verus fresh wood
4 Fresh wood left Skeppsmask right
5 Echogram 120kHz, medium pulse Fresh wood Skeppsmask
6 Fresh wood Skeppsmask
7 Fresh wood Skeppsmask Typical wobbling effect seen In a log with skeppsmask Note the stable echo in this log
8 Fresh wood Skeppsmask
9 TS Range
10 Summary of findings u Wood with “skeppsmask” returns stronger echo than fresh wood. Not expected u Wood with skeppsmask has higher fluctuations in TS than fresh wood, (not expected) u There is a difference in the ringing behind the target
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1 Improved fish detection probability in data from split- beam sonars. Helge Balk and Torfinn Lindem. Department of Physics. University of Oslo.
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