J4 ›› 2016, Vol. 33 ›› Issue (1): 75-80.

• Laser Applications • Previous Articles     Next Articles

Measurement of  fluid-velocity profile and flow rate in rectangular duct based on laser-diode self-mixing effect

Lu Anli ,Liu Jianguo ,Gui Huaqiao ,Sun Wu,Cheng Yin,Yu Tongzhu   

  1. 1 Key Laboratory of Environmental Optics and Technology , Anhui Institute of Optics and Fine Mechanics , Chinese Academy of Sciences , Hefei , Anhui 230031 , China 
    2 Anhui Key Laboratory of Environmental Optics and Technology, Hefei , Anhui 230031 , China)
  • Received:2015-02-13 Revised:2015-04-19 Published:2016-01-28 Online:2016-01-06

Abstract:

Accurate measurement of fluid-velocity profile and flow rate in complex duct is important to master the velocity distribution law and its application. A scheme of measuring the fluid-velocity profile and flow rate in rectangular duct based on laser-diode self-mixing effect was proposed. Based on the self-mixing interference theory and velocity distribution of laminar flow in rectangular duct theory, the feature of frequency spectrum of self-mixing signal of laminar flow in rectangular duct was analyzed. The feature of fluid-velocity profile and flow rate in rectangular duct were obtained. The average relative error of measured fluid-velocity is 2.7%. The relative errors of measured flow rate in rectangular duct are less than 2.0%. Experimental measurements accord with the theory.

Key words: laser techniques ; flow velocity ; flow rate ; self-mixing ; rectangular duct

CLC Number: