对流水槽温度场和速度场的测量

根据室内模拟大气边界层的需要，开发了适合于水中温度场和速度场测量的快速响应设备。采用铂电阻传感器多探头测量温度场，速度场采用片光源流动显示及PTV数据处理技术。温度和速度测量设备响应快，分辨率高，为室内模拟研究提供了可靠的实验手段。文中分析了温度和速度测量的系统误差和偶然误差，并提出了速度测量改进方法。

Measurement Methods of Temperature Field and Velocity Field in the Convective Tank

In need of study of atmospheric convective boundary layer(ACBL) in laboratory model , we developed a set of equipments used for measuring temperature and velocity field in water. Single-probe sensor made of copper was used for measuring mean temperature, and multi-probe sensor made of platinum was used for measuring temperature fluctuation . These sensors can be moved by motors. Microparticles illuminated by a laser light sheet and particle tracing velocimetry (PTV) technology were used for measuring velocity. Response of these equipments is fast, and resolution is high, so the laboratory model can be provided with reliable experimental methods. From the measuring results, the structure of the laboratory model of ACBL, especially of entrainment zone, can be studied at large. The measurement errors of temperature and velocity and their estimation were also analyzed. The error of measuring temperature mostly came from random error, and the random error is about 0.005℃. The error of measuring velocity mostly came from systematic error .How to decrease error was prosposed in the paper.