Method for recognizing structure layer inside tree on basis of radar waves

Abstract

The invention relates to a continuous and nondestructive method for recognizing a layer structure in a tree, and can detect and image structures and abnormity in trees. Echo data are obtained at first by using radar waves to detect trees. When the radar waves are transmitted in wood, different dielectric constants in the wood affect radar wave transmitting speed, amplitude intensity, reflection time and the like. Dielectric constants of different dielectric layers (a bark, a splint wood and a heartwood) inside the tree are different, echo signal amplitude and reflection time of the radar waves are different. The dielectric constants of the various layers are estimated by a layer-by-layer inversion method, and electromagnetic wave transmitting speed is determined; and echo time delay of the various layers is obtained by a Hilbert detection method. Thicknesses of the various layers are determined on the basis of the echo time delay and the transmitting speed. According to the characteristics that a reflection wave amplitude value and value of difference between dielectric constants of adjacent interfaces are directly proportional, and reflection wave time delay depends on the property and the position of dielectric, the position and the shape of a rotten part in the tree can be determined by analyzing echo signal time delay and amplitude.

Description

technical field [0001] The invention belongs to the field of tree trunk internal structure detection and evaluation, in particular to a method for layer recognition of tree internal structure based on radar waves Background technique [0002] Trees growing in the natural environment are vulnerable to environmental deterioration and external infringement, which will affect the health and stability of trees, destroy the ecological environment, and untimely remedial and preventive measures will easily cause economic losses; internal defects, plant diseases and insect pests in forest areas and forest farms affect the growth quality; urban greening Trees are damaged and broken and toppled in bad weather, endangering people's property and life safety; ancient and famous trees are damaged by fungi and insects, causing irreparable losses to national cultural heritage. The damage to trees is mainly manifested as cracks, scabs, decay and hollows inside the trees. Most of the living t...

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Problems solved by technology

[0002] Trees growing in the natural environment are vulnerable to environmental deterioration and external infringement, which will affect the health and stability of trees, destroy the ecological environment, and untimely remedial and preventive measures will easily cause economic losses; internal defects, plant diseases and insect pests in forest areas and forest farms affect the growth quality; urban greening Trees are damaged and broken and toppled in bad weather, endangering the safety of people, property and lives; ancient and famous trees are damaged by fungi and insects, causing irreparable losses to national cultural heritage

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