基于超声波水面蒸发测量系统的研究

Research on the system of water surface evaporation measurement based on ultrasound

文章阐述了超声波水面蒸发测量原理,分析了测量误差产生的主要原因并探讨了误差补偿方法,提出了通过测量温湿度进行声速修正,以及利用最小二乘法补偿非线性误差以提高水面蒸发测量精度的方法。通过GPRS无线传输模块进行数据的远程传送,实现了水面蒸发的远程遥测。文章还介绍了整个系统的硬件和软件设计,并进行了相关实验研究,实验结果表明:该水面蒸发测量系统实用性强、精度高、稳定性好。

This paper describes the principle of water surface evaporation measurement based on the ultrasound. And the main error sources of this measurement and its compensation resolutions are analyzed. A method of improving precision of the measurement of water surface evaporation is proposed, in which the transmission speed of ultrasonic wave is corrected by measuring air temperature and humidity. The non-linear error is compensated with the least-square method. In addition, the module of wireless data transmission based on GPRS is designed,which makes it possible to telemeter evaporation. The hardware and software of the system are introduced and some experiments are done in this paper. The result indicates that this applied system has higher precision and better stability.