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Optic simulation and optimization of a laser Doppler velocity profile sensor for microfluidic applications

机译：用于微流控应用的激光多普勒速度分布传感器的光学仿真和优化

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摘要

The application of laser Doppler velocimetry to microfluidic flows is usually prevented due the large size of the measurement volume of typically 100 μm. A significantly higher spatial resolution can be achieved with the concept of the laser Doppler velocity profile sensor. However, the resolution is limited by wavefront distortions caused by aberrations of the optical setup. In this work, optical simulation software was employed to investigate the aberrations caused by the profile sensor setup by going from ideal to real lenses step by step. As the main source for the aberrations, the aspheric lens for collimating the laser beams was identified. On the basis of this simulation the setup of the velocity profile sensor could be optimized. The sensor was employed to measure the velocity profile in a microchannel. A spatial resolution of 1.2 μrn and a relative uncertainty of the velocity of 0.25% result, confirming the findings of the simulation. This demonstrates the potential of the optimized velocity profile sensor for flow measurements at the microscale.
机译：通常由于大体积的测量体积（通常为100μm），通常无法将激光多普勒测速仪应用于微流。激光多普勒速度分布传感器的概念可以实现更高的空间分辨率。然而，分辨率受到由光学装置的像差引起的波前畸变的限制。在这项工作中，光学仿真软件被用来逐步研究由轮廓传感器设置引起的像差，方法是从理想的透镜到真实的透镜。作为用于像差的主要来源，已确定了用于准直激光束的非球面透镜。在此模拟的基础上，可以优化速度分布传感器的设置。该传感器用于测量微通道中的速度分布。结果为1.2μrn的空间分辨率和0.25％的速度相对不确定性，证实了仿真的结果。这证明了优化的速度分布传感器在微尺度上进行流量测量的潜力。

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  • 来源
    《Optical engineering》 |2010年第7期|p.073602.1-073602.9|共9页
  • 作者

    Lars Buettner; Christoph Skupsch; Joerg Koenig; Juergen Czarske;

  • 作者单位

    Technische Universitaet Dresden Faculty of Electrical Engineering and Information Technology Laboratory for Measurement and Testing Techniques Helmholtzstrasse 18 01069 Dresden, Germany;

    rnTechnische Universitaet Dresden Faculty of Electrical Engineering and Information Technology Laboratory for Measurement and Testing Techniques Helmholtzstrasse 18 01069 Dresden, Germany;

    rnTechnische Universitaet Dresden Faculty of Electrical Engineering and Information Technology Laboratory for Measurement and Testing Techniques Helmholtzstrasse 18 01069 Dresden, Germany;

    rnTechnische Universitaet Dresden Faculty of Electrical Engineering and Information Technology Laboratory for Measurement and Testing Techniques Helmholtzstrasse 18 01069 Dresden, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    laser doppler velocimetry; laser doppler velocity profile sensor; wavefront aberration; flow measurement; microfluidics;

    机译：激光多普勒测速仪激光多普勒速度分布传感器;波前像差流量测量;微流体;

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