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Measuring trees with the speed of sound

Foresters and researchers are using sound to look inside living trees. A new study presents methods for use of sonic tomography, which measures wood decay by sending sound waves through tree trunks. The new study describes optimum placement of the sensors to avoid aberrant tomography results for the non-model tree shapes that populate the tropics and details how to analyze the tomograms to quantify areas of decayed and damaged wood.

(via WSJ)