超声波土壤含水量检测装置的模型建立与验证

发布时间：2018-03-02 09:09

  本文关键词： 土壤 模型 土壤含水量 超声波脉冲速度 差值声速　出处：《农业工程学报》2017年13期 　论文类型：期刊论文

【摘要】：为探究利用超声波脉冲速度检测土壤体积含水量的可行性,以广东省红壤、赤红壤、水稻土为研究对象,设计了一种超声波土壤含水量检测装置,并利用ZBL-U510型非金属超声波检测仪在3种不同温度环境下(10、20、30℃)对不同含水量的土壤样本进行声速测定,构建了土壤体积含水量与超声波差值声速的温度效应数学模型。结果表明:超声波在水稻土中的传播速度比红壤、赤红壤快,且温度对超声波声速随土壤体积含水量变化节律的影响不同。20℃环境下超声波在土壤中的传播速度最快,10℃其次,30℃最慢。采用Richards模型表征土壤体积含水量与超声波差值声速关系的预测误差在3%左右,采用分段结构温度效应模型的预测误差在5%以内,证明该文提出的超声波脉冲速度-土壤体积含水量的温度效应模型可用于动态温度条件下的土壤含水量预测。该研究可为超声波技术在土壤水分检测领域的应用研究提供参考。
[Abstract]:In order to explore the feasibility of using ultrasonic pulse velocity to detect soil volume water content, a kind of ultrasonic wave measuring device for soil water content was designed with red soil, lateritic red soil and paddy soil in Guangdong Province as the research object. The sound velocities of soil samples with different water content were measured by using ZBL-U510 nonmetallic ultrasonic detector at three different temperatures. The temperature effect mathematical model of the difference between soil volume water content and ultrasonic wave velocity was established. The results showed that ultrasonic wave propagation in paddy soil was faster than that in red soil, and that in lateritic red soil, the velocity of ultrasonic wave in paddy soil was faster than that in lateritic soil. The effect of temperature on the rhythm of ultrasonic wave velocity with soil volumetric water content was different. The speed of ultrasonic wave propagation in soil was the fastest at 10 鈩，

本文编号：1555893