中国农业科学院农业信息研究所 中国农学会
Agricultural Information Institute of CAAS China Association of Agricultural Science Societies
En
Ch
中国农业科学院农业信息研究所 中国农学会 主办

AI检索

订阅

返回顶部
当前位置: 首页 > 文章 > 番茄声发射信号功率谱特征分析 农业机械学报 2017,48 (10) 189-194
Position: Home > Articles > Power Spectrum Characteristics Analysis for Acoustic Emissions Signal of Tomato Transactions of the Chinese Society for Agricultural Machinery 2017,48 (10) 189-194

番茄声发射信号功率谱特征分析

作  者：
余礼根;李长缨;陈立平;薛绪掌;卫如雪;郭文忠
单  位：
北京农业智能装备技术研究中心
关键词：
番茄;声发射;功率谱;土壤含水率;共振峰
摘  要：
采用番茄品种“佳丽14”为试材,采集盆栽番茄声发射信号进行短时傅里叶变换与频谱分析,获取番茄在水分亏缺条件下声发射信号、土壤含水率及光合特征的连续变化规律及相互关系.依据土壤含水率变化将试验过程划分为DAY1、DAY2、DAY3和DAY4共4个阶段.试验结果表明,番茄声发射信号发生频次呈现出规律性,高峰期发生时间为每天10:00-16:00,幅值分布在40 ~60 dB;番茄声发射信号的主频和中心频率分布于250 ~375 kHz,随着土壤含水率的降低,其主频与中心频率无显著变化;DAY1的第1共振峰频率分布在0~ 125 kHz,第2共振峰、第3共振峰位于250 ~375 kHz,DAY2、DAY3和DAY4的第1、第2、第3共振峰均分布在250 ~375 kHz;从共振峰幅值上看,DAY1的排列顺序为第3、第2、第1共振峰;DAY2和DAY4的次序与之相反.番茄叶片净光合速率变化呈现单峰曲线,在中午12:00出现峰值,番茄的胞间CO2浓度呈现先增后减的变化趋势.综合分析番茄声发射信号、土壤含水率和光合特征参数变化可知,番茄灌溉初期与灌水后期的声发射信号共振峰频率、幅值的变化规律不同,其与水分亏缺程度密切相关,与番茄净光合速率、胞间CO2浓度和光合作用具有相关性.通过番茄声发射信号功率谱特征分析可为番茄声发射特性研究提供一种分析方法.
译  名：
Power Spectrum Characteristics Analysis for Acoustic Emissions Signal of Tomato
关键词：
tomato%acoustic emission%power spectrum%soil water contents%resonance peak
摘  要：
Taking tomato variety of ‘Jiali14'as experimental materials,the relationship among the acoustic emissions signal,soil water contents and photosynthetic characteristic parameters of tomato under water deficit was analyzed.The short-time Fourier transform and power spectrum analysis computed by LabVIEW 2014 were employed to examine the spectrum characteristics of the collected AE signals.The whole process of water deficit was approximately divided into four stages:DAY1,DAY2,DAY3 and DAY4 according to the soil water contents.The results showed that characteristics for AEs during the water deficit period were presented by a regular change pattern,while the peak time was 10:00-16:00 and the amplitude was 40 ~ 60 dB.Power spectrum for acoustic emissions of tomato was a phenomenon observed in characteristic parameters with dominant frequency (fp),central frequency (fa) and formants.The frequencies of fp,fa and the second,third resonance peaks of DAY1 were distributed at 250 ~375 kHz,where the first resonance peak of DAY1 was distributed mainly at 0 ~ 125 kHz.The first,second and third resonance peaks of DAY2,DAY3 and DAY4 were all centralized at 250 ~ 375 kHz.From the amplitude of resonance peaks,the arrangement of DAY1 was the third,second,and first formant,but the order of formants for DAY2 and DAY4 were opposite of DAY1.A single peak curve was existed with net photosynthetic rate of tomato,and the peak value Pn occurred at 12:00,whereas the intercellular CO2 concentrations were increased firstly and then decreased with the decrease of soil water contents.Although the changes of amplitude and frequencies of resonance peaks for acoustic emissions of tomato in initial irrigation stage and late irrigation stage were different,a good correspondence between AE outcomes and experimental observations of the net photosynthetic rate,intercellular CO2 concentrations and photosynthetic performances was obtained and discussed.This result may provide a new monitoring method for acoustic emissions characteristics of water deficit through power spectrum analysis.

相似文章

导出引用
计量
文章访问数: 7
HTML全文浏览量: 0
PDF下载量: 0

所属期刊

推荐期刊

友情链接Friendly link
农业信息研究所Agricultural information institute 农业智能知识服务平台Agricultural intelligent knowledge service platform 农业学术服务平台Agricultural Knowledge Service System 中国知网CNKI 维普网VIP 万方WANFANG DATA
联系我们Contact us

电话Tell：010-82109652-808

邮箱E-mail：agrijournal@caas.cn

服务Service
关于我们About us 意见建议Opinions and suggest
版权说明Copyright
单位：中国农业科学院农业信息研究所 中国农学会 © 2017中国农业科学院农业信息研究所 ICP备案号：京ICP备09089781号-46