农业机械学报2017，Vol.48Issue(10)：195-201,7.DOI:10.6041/j.issn.1000-1298.2017.10.024
基于超声射频的植物茎体水分无损检测方法研究
Non-destructive Measurement of Plant Stem Water Content Based on Ultrasonic Radio Frequency
摘要
Abstract
Water is directly or indirectly involved in the activities of plant physiology.One role of stems is water storage,the other is water transmission channel.Detection of plant stem water by non-destructive online method becomes one of the hot spots in the study of plant water physiological activity.A real-time online non-destructive detection system designed by LabVIEW was proposed based on ultrasonic echoes,which was composed by ultrasonic probe,ultrasonic RF transmitter receiver,data acquisition instrument and portable computer.The simulation model was built by the system with various ultrasonic velocities of different organic solutions to represent the water content of plant stems.The correlation between the changes of water content and that of ultrasonic velocity was analyzed on a set of poplar cutting samples in the process of water absorption of those samples.The average determination coefficient reached about 0.98.For 24 h detection on stem of a living Michelia alba,the highest ultrasonic velocity appeared at 14:00,and the lowest appeared at 22:00.The results showed the variations of ultrasonic velocity accorded with plant physiological characteristic.Meanwhile,the variations of velocities in radial and axial directions and in different kinds of plant stem were detected by the system,which provided a detection instrument with structural differences for the research on plant stem water physiological characteristics.关键词
茎体水分/超声/无损检测Key words
stem water content/ultrasonic/non-destructive detection分类
信息技术与安全科学引用本文复制引用
吕丹桔,施心陵,董易,王跃民,王霞,王超..基于超声射频的植物茎体水分无损检测方法研究[J].农业机械学报,2017,48(10):195-201,7.基金项目
国家自然科学基金项目(61661050)和昆明市林业信息工程技术研究中心重点项目(2015) （61661050）
