基于电阻抗成像的立木孔洞缺陷检测研究
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摘要：
为实现对树木内部缺陷的识别和无损检测，提出一种基于电阻抗成像的立木孔洞缺陷检测系统设计方法。该系统以STM32F103ZET6为主控板。首先，将正弦激励电压信号输人Howland桥式压控电流源电路，获得输出激励电流；接着，采用16个针式电极，按照相邻激励相邻测量的策略将激励电流循环输人到立木表面电极上并采集电压测量信号；然后，利用数据处理模块对测量的微弱电压信号进行放大、滤波、解调处理，并经由串口传输至上位机；最后，通过图像重建算法重构立木内部生长情况的电导率分布图像，实现立木孔洞缺陷可视化检测.实验结果表明，所提基于电阻抗成像的立木孔洞缺陷检测系统可以有效识别立木孔洞缺陷的位置和轮廓，能够实现立木内部缺陷的无损检测。
In order to realize the identification and non-destructive testing of internal defects in trees, a design method of standing tree hole defect detection system based on electrical impedance tomography was proposed. The system uses STM32F103ZET6 as the main control board, firstly, the sinusoidal excitation voltage signal is input into the Howland bridge voltage controlled current source circuit to obtain the output excitation current; Then, 16 needle electrodes were used, and the excitation current was cyclically input to the standing trees surface electrode and the voltage measurement signal was collected according to the strategy of adjacent excitation and adjacent measurement. Then, the data processing module is used to ampli-fy. filter and demodulate the measured weak voltage signal, and transmit it to the upper computer through the serial port. Fi-naly, the image reconstruction algorithm was used to reconstruct the conductivity distribution image of the internal growth of the standing trees, and the visual detection of the hole defects of the standing trees was realized. Experimental results show that the proposed electrical impedance imaging based on standing tree hole defect detection system can effectively identily the loca-tion and contour of standing tree hole defects, and can realize the non-destructive detection of standing tree internal defects.
作者：
施艳艳,李玉珠,罗文雪,王萌
Shi Yanyan, Li Yuzhu, Luo Wenxue, Wang Meng
机构地区：
河南师范大学光电工程学院
引用本文：
施艳艳，李玉珠，罗文雪等。基于电阻抗成像的立木孔洞缺陷检测研究[J].河南师范大学学报(自然科学版).2026,54(4):106-112. (Shi Yanyan, Li Yuzhu, Luo Wenxue,et al. Research on hole defect detection of standing trees based on electrical impedance imaging[J].Journal of Henan Normal University(Natural Science Edition),2026,54(4) :106-112.DOI:10.16366/j.cnki.1000-2367.2025.02.16.0002.)
基金：
国家自然科学基金
关键词：
立木；电阻抗成像；缺陷检测
standing tree; electrical impedance tomography; defect detection
分类号：
TP216
