25 Years of Acoustic Tomography — and a New Device for Non-Destructive Tree Assessment
In addition to the signal’s transit time, the new impactor acoustic tomograph records other important characteristics that improve diagnosis.
Articles tagged “Tomography”
Accuracy and reproducibility of acoustic tomography significantly increase with precision of sensor position
To produce accurate and repeatable tomograms of trees with complex shapes, it is essential to measure the sensor positions precisely. Accuracy of the position of sensors affects estimated stress wave velocity, the shape of the tomogram, the size of the defect, and the estimated loss in load carrying capacity.
Reproducibility of Stress Wave and Electrical Resistivity Tomography for Tree Assessment
Provided that sensor positions are accurately recorded and documented, tomograms can reliably be repeated by different assessors over periods of years. Assessments based on complex calculations like loss of section modulus should be treated with caution, because they accumulate and amplify all sources of variation.
Comparison of methods to measure sensor positions for tomography
Precise sensor positions in tomography can be measured quickly.
Are bumps an indicator of decay in London plane trees?
Often, the stem surface of mature London plane trees is bumpy. Our results, derived from a thorough characterization of the stem surface, tomography, and thermography, show that this does not indicate inner defects.