A bipolar, two component laser-Doppler velocimeter

R. J. Adrian

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


A fringe mode laser-Doppler velocimeter is described that instantaneously measures two orthogonal velocity components that have fluctuating signs. The optical system utilizes an equiangular configuration of three intersecting beams which allows measurements of the normal velocity component to be taken in close proximity to a wall. Acousto-optic frequency shifting of two beams is used to eliminate cross channel interference and to provide detection of the velocity polarity. The instrument is applicable to flows having velocities in the range of +or-1 mm s-1 to +or-10 m s-1.

Original languageEnglish (US)
Article number011
Pages (from-to)723-726
Number of pages4
JournalJournal of Physics E: Scientific Instruments
Issue number9
StatePublished - Dec 1 1975
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation
  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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