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Design and Test of a Microdestructive Tree-Ring Measurement System.

Xueyang Hu1,2,3, Yili Zheng1,2,3, Hao Liang1,2,3

  • 1School of Technology, Beijing Forestry University, Beijing 100083, China.

Sensors (Basel, Switzerland)
|June 11, 2020
PubMed
Summary

This study introduces a microdestructive tree-ring measurement system using a microdrill and analyzing drill resistance. The system accurately determines tree age and growth by detecting wood density variations, achieving high measurement accuracy for larch and fir trees.

Keywords:
DC servomotor controlFIR filteringanalysis of a tree ringmicrodestructive measurement

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Area of Science:

  • Dendrochronology
  • Biophysical Measurement Systems
  • Forestry Science

Background:

  • Tree ring analysis is crucial for determining tree age and growth patterns.
  • Traditional methods can be destructive or lack precision.
  • Microdestructive techniques offer a less invasive approach to tree ring analysis.

Purpose of the Study:

  • To develop and evaluate a microdestructive tree-ring measurement system.
  • To accurately determine tree age and growth by analyzing wood density variations.
  • To achieve precise tree ring measurements with minimal impact on living trees.

Main Methods:

  • A microdestructive system utilizing a 3 mm microdrill, mechanical transmission, DC servomotor, and stepper motor.
  • Measurement of drill resistance via DC servomotor armature current sampling.
  • Application of a finite impulse response (FIR) filtering algorithm to process signals and identify tree rings.
  • Testing on larch and fir tree discs to validate system performance.

Main Results:

  • The system achieved an average annual ring measurement accuracy of 95.28% for larch discs.
  • An average accuracy of 84.16% was recorded for fir discs.
  • The microdrill diameter remained under 3 mm, ensuring minimal damage to living trees.

Conclusions:

  • The developed microdestructive system effectively measures tree rings with high accuracy.
  • The method provides a valuable tool for dendrochronology and forest research.
  • This technique allows for precise tree age and growth determination with reduced tree damage.