高精度红外叶温测量系统研发

发布时间：2018-03-21 23:18

  本文选题：红外辐射　切入点：叶温　出处：《河北大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着精准农业的不断发展,在许多植物、农作物的种植过程中,如何快速、准确的监测植物叶温或植物冠层温度,以研究农田蒸散、灌溉、品种选育以及产量预报,已经成为现代农业发展中的焦点问题。本文针对目前植物叶温测量不准确、操作复杂、费时费力等问题,研发了高精度的红外叶温测量系统。首先,本文设计了测温模块、时钟模块、存储模块、显示模块等硬件电路,实现了红外测温传感器驱动程序以及各功能模块的软件设计,然后提出了准确测量植物叶片发射率的方法,对测量距离进行了系统误差补偿,最后对系统功能进行了测试,并对补偿效果进行了实验验证。本设计完成了基于MSP430F249单片机的高精度红外叶温测量系统,采用MLX90614DCI红外传感器实现了植物叶片温度的非接触式测量。同时,系统还具有时钟模块,存储模块和显示模块,实现了叶温的实时监测,并对温度数据进行存储、显示。高精度是系统的另一特色,本文对影响系统测温精度的因素,包括对叶片发射率、环境因素以及测量距离做了理论分析,然后通过实验证实,叶片发射率和测量距离是影响本系统精度的因素,从而提出了误差补偿公式,使测温误差可以达到±0.1℃,精度高于现有的大多数测温设备,能够满足现代农业发展中对叶温测量准确性的要求。
[Abstract]:With the continuous development of precision agriculture, how to quickly and accurately monitor plant leaf temperature or plant canopy temperature in the process of planting many plants and crops in order to study evapotranspiration, irrigation, variety breeding and yield prediction, It has become a focal point in the development of modern agriculture. Aiming at the problems of inaccurate plant leaf temperature measurement, complicated operation and time-consuming and laborious measurement, a high precision infrared leaf temperature measurement system is developed. First, the temperature measurement module is designed. Clock module, storage module, display module and other hardware circuits, the infrared temperature sensor driver and the software design of each functional module are realized, and then the method of accurately measuring the emissivity of plant blade is proposed. The system error compensation of measuring distance is carried out, and the function of the system is tested, and the effect of compensation is verified experimentally. A high precision infrared leaf temperature measuring system based on MSP430F249 single chip microcomputer is designed. The MLX90614DCI infrared sensor is used to realize the non-contact measurement of plant leaf temperature. At the same time, the system also has clock module, storage module and display module, which realizes the real-time monitoring of leaf temperature, and stores the temperature data. It is shown that high accuracy is another characteristic of the system. This paper makes a theoretical analysis of the factors affecting the accuracy of temperature measurement of the system, including blade emissivity, environmental factors and measuring distance. The emissivity and the measuring distance of the blade are the factors that affect the accuracy of the system, so the error compensation formula is put forward. The error of measuring temperature can reach 卤0.1 鈩，

本文编号：1646012