Laser Doppler field sensor for high resolution flow velocity imaging without camera

Andreas Voigt, Christian Bayer, Katsuaki Shirai, Lars Büttner, Jürgen Czarske

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


In this paper we present a laser sensor for highly spatially resolved flow imaging without using a camera. The sensor is an extension of the principle of laser Doppler anemometry (LDA). Instead of a parallel fringe system, diverging and converging fringes are employed. This method facilitates the determination of the tracer particle position within the measurement volume and leads to an increased spatial and velocity resolution compared to conventional LDA. Using a total number of four fringe systems the flow is resolved in two spatial dimensions and the orthogonal velocity component. Since no camera is used, the resolution of the sensor is not influenced by pixel size effects. A spatial resolution of 4 μm in the x direction and 16 μm in they direction and a relative velocity resolution of 1 × 10-3 have been demonstrated up to now. As a first application we present the velocity measurement of an injection nozzle flow. The sensor is also highly suitable for applications in nano- and microfluidics, e.g., for the measurement of flow rates.

Original languageEnglish
Pages (from-to)5028-5040
Number of pages13
JournalApplied Optics
Issue number27
Publication statusPublished - 2008 Sept 20
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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