激光多普勒技术测量微管中液流加速度  

Measurement of Acceleration in a Pipeline Flow Using the Laser Doppler Technology

作　　者：周程[1,2] 李煌[1,2] 姚焜[1,2] 李银妹[1,2] 

机构地区：[1]合肥微尺度物质科学国家实验室,安徽合肥230026 [2]中国科学技术大学物理系,安徽合肥230026

出　　处：《应用激光》2009年第3期237-240,共4页Applied Laser

基　　金：国家高技术研究发展计划(863)(项目编号:2007AA021811;2007AA02809);中国科学院知识创新工程重要方向资助项目(项目编号:KJCX2-YX-H-10)

摘　　要：激光的广泛应用已经扩展到流体力学领域,如激光多普勒测流速,而加速度的量也与流体的动力学过程密切相关。提出了一种测量微管中流体加速度的新方法。搭建双光束干涉平台,在光路中引入微流管道,通过流体力学公式的推导,得出液流微弱加速度的产生与表式。微流发生时,采集实验数据并对其作信号处理与时频分析,得到信号频率随时间线性变化的关系。时频曲线的斜率即反应了加速度的信息。The application of laser has extended to hydromechanical area, such as the measurement of velocity of flow using Laser Doppler Technique（LDT）. The parameter acceleration is also affinitive with hydrodynamics in flows. A new method for measuring acceleration of flow is protended. Platform for dual-beam interference is set up. A micro-flow pipe is introduced into the optical path. The generation and form of weak acceleration are deduced. The experimental data are collected for signal processing and time-frequency analysis, result shows that signal frequency changes linearly while time elapses. Slope of the timefrequency response curve indicates information of the acceleration.

关 键 词：激光多普勒技术 流体力学 加速度 微管道 

分 类 号：O35[理学—流体力学] TH824[理学—力学]