Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Fluidic velocity sensing with a speaker based optical doppler tomography

유속 센싱을 위한 스피커형 광학적 유체 단층촬영 기술

  • Lee, Chang-Ho (School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Kim, Jee-Hyun (Department of Computer Engineering, Kyungpook National University)
  • 이창호 (경북대학교 전자전기컴퓨터공학부) ;
  • 김지현 (경북대학교 컴퓨터공학과)
  • Published : 2008.07.31
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Abstract

This paper presents an optical doppler tomography(ODT) system using a speaker as a method to achieve depth measurement in a flowing sample. The use of the speaker provides easy implementation with a low cost. The nonlinear characteristics of the speaker has hindered its adaptation because it produces inconsistent fringe frequencies at different depths. This paper reports an adaptive algorithm to compensate the nonlinear characteristics, and could, resultantly, acquire the Doppler frequency shift caused by the sample. The experiment utilizes a flowing scattering particle solution in a capillary tube at a certain flow rate. The Doppler frequency profile over the lumen was calculated by using spectrogram method. and we obtained the velocity image of the sample.

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References

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