农业机械学报2012，Vol.43Issue(10)：179-183,5.DOI:10.6041/j.issn.1000-1298.2012.10.032
基于柱面近场声全息的植物病害胁迫分析
Plant Disease Stress Analysis Based on Cylindrical Near-field Acoustic Holography
摘要
Abstract
When plant suffered from disease, the acoustic emission signal released. In order to understand the acoustic emission signal distribution regularities, the relationship between the degree of plant disease and acoustic emission signal' s position was analyzed. The near-field acoustic holography based on spatial transformation of sound fields was used for the purpose of reconstruction model. The reconstruction algorithm was given out in order to realize the simulation through Matlab software. The parameters, such as the size of holographic cylindrical, the spacing of measurement points, the holographic radius, the reconstruction radius and so on should be adjusted constantly to obtain the optimal parameters. In view of the impact of environmental noise and acoustic emission signal characteristics, the window function was introduced into ultrasonic frequency signal to obtain the optimum simulation results. It was showed that cylindrical near-field acoustic holography based on spatial transformation of sound fields can be applied for recognition and positioning of acoustic emission signal accurately.关键词
植物/病害胁迫/近场声全息/声发射信号Key words
Plant/ Disease stress/ Near-field acoustic holography/ Acoustic emission signal分类
农业科技引用本文复制引用
王秀清,王尹超,杨世凤,赵继民,张静雅..基于柱面近场声全息的植物病害胁迫分析[J].农业机械学报,2012,43(10):179-183,5.基金项目
国家自然科学基金资助项目(61071207) （61071207）
