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Skeppsmask

This study examines the phenomenon of "skeppsmask" in log wood and compares it to fresh wood. The echoes, wobbling effect, and fluctuations in transmission strength are analyzed. Surprisingly, wood with skeppsmask exhibits stronger echoes and higher TS fluctuations compared to fresh wood. There is also a noticeable difference in the ringing behind the target.

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Skeppsmask

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  1. Skeppsmask

  2. Wahlberg, Axenrot and Balk 2005 A short study of Skeppsmask in a log verus fresh wood

  3. Fresh wood left Skeppsmask right

  4. Echogram 120kHz, medium pulse Fresh wood Skeppsmask

  5. Fresh wood Skeppsmask

  6. Fresh wood Note the stable echo in this log Skeppsmask Typical wobbling effect seen In a log with skeppsmask

  7. Fresh wood Skeppsmask

  8. TS Range

  9. Summary of findings • Wood with “skeppsmask” returns stronger echo than fresh wood. Not expected • Wood with skeppsmask has higher fluctuations in TS than fresh wood, (not expected) • There is a difference in the ringing behind the target

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