热毛细对流自由面微弱位移信号高灵敏度相位检测系统  

High-sensitivity phase detecting system for measurement of weak displacement signals on the liquid free surface in thermocapillary convection

作　　者：曹文慧 段俐 李永强[2] 康琦 CAO WenHui;DUAN Li;LI YongQiang;KANG Qi(Institute of Mechanics,Chinese Academy of Sciences,School of Engineering Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Faculty of Science,Northeast University,Shenyang 110819,China)

机构地区：[1]中国科学院力学研究所,中国科学院大学工程科学学院,北京100190 [2]东北大学理学院,沈阳110819

出　　处：《中国科学：技术科学》2018年第8期908-920,共13页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号：11372328,11502271); 自然科学基金联合基金(批准号：U1738116)资助项目

摘　　要：在流体力学的研究领域,流体自由面的变化是一种非常重要的物理现象.针对自由面的形变位移,研制一套双频激光相位光电检测系统.将光学干涉技术与相位计相结合,实时获得相位计输出的反映流体表面形变的信号.本文详述了此双频激光相位光电检测系统的原理和装置.通过高精度PI步进电机驱动物体移动,标定系统的性能特性.应用激光位移传感器验证该系统的精度,同时分析环境对干涉测量系统的影响.将该系统应用于浮力热毛细对流自由面形变测量中,获得有意义的实验结果.In the research of fluid mechanics, the change on the fluid free surface is a very important physical phenomenon. To measure the displacement of the free surface deformation, a dual frequency laser photoelectric phase detecting system is developed. Combining the optical interference technology with the phasemeter, the detecting system collects real time phasemeter signals reflecting the deformation on the fluid free surface. The principle and setup of this dual frequency laser photoelectric phase detecting system are discussed in detail in this paper. By using the high-precision PI step motor to drive the object to move, the performance characteristics of the system is determined. The accuracy of this system is verified by the laser displacement sensor, and the environment influence on the interferometry system is also analyzed. Applying this system in the measurement of free surface deformations in buoyancythermocapillary convection, we have obtained meaningful experimental results.

关 键 词：表面变形 干涉测量 相位计 热毛细流动 

分 类 号：O35[理学—流体力学]