含温度补偿的便携式土壤水分测定仪研制

Development of portable instrument for measurement of soil moisture with temperature compensation

针对现有土壤水分测定仪的不足，研制了一种新型的便携式土壤水分测定仪。传感器快速测量出土壤温、湿度数据，GPS自动获取时间、经纬度信息，数据既可临时保存在仪器的存储芯片中，又可通过GPRS／GSM将数据及时发送到后台数据库和手机用户。通过温度补偿和野外验证实验得出，温度补偿项为Ay=O．0002t3-0．011t2＋O．444lt-6．4232，仪器所有功能运行正常，测量绝对误差为-3．64％-3．82％，平均绝对误差为2．24％，精度较高，适合在地方农技和水利部门推广应用，有助于农业水利信息化水平的提高。

Aiming at deficiency of existing instrument for measurement of soil moisture, a new type of portable instrument for measurement of soil moisture is developed. Sensors measure the soil temperature and humidity data quickly, GPS automatically obtain time,longitude and latitude information, data not only can be temporarily stored in memory chips of instrument, but also can be sent timely to the backstage database and mobile phone users by GPRS/GSM. Through temperature compensation and field verification experiments show that temperature compensation item is Ay =0. 0002 t3 -0. 011 t2 ＋0. 444 1 t -6. 423 2, all functions of instrument work properly, absolute error of measurement range of -3.64 % - 3.82 % , average absolute error is 2.24 % , it has high precision, and suitable for application in local agriculture technique and water conservancy department, and it will help improving the quality of agricultural water conservancy informatization level.