Development of a Measurement Method for Three-imensional Treeing Degradation using a Computerized Tomography Method and a Light Penetrating Method

Abstract

To measure the time to tree-initiation and the tree-growth rate, methods by visual measurements of trees in organic insulating materials through an ptical microscope have been used so far. We developed a system to measure tree-growth rate and degraded area of a tree in organic insulating materials using an optical microscope. It was, however, impossible to measure three-dimensional shape of a tree by those methods.
This paper describes the volume of a tree immediately after initiation, as well as changes in the configuration of the tree by a computerized tomography method and a light penetrating method.
Specimens were made of PMMA. As a result it was possible to record the cross sections of a tree by the method, and to describe the degraded volume of a tree from the sum total of the cross sections. We determined the specific characteristics of the degraded volume of tree and the cross section area of the tree. It was possible to recognize the difference of the shape of a tree by investigating characteristics.