Mapping of velocity flow fields using the laser-two-focus technique

Helmut Selbach

doi:10.1117/12.34952

1 November 1990 Mapping of velocity flow fields using the laser two focus technique

Helmut Selbach

Proceedings Volume 1404, ICALEO '89: Optical Methods in Flow and Particle Diagnostics; (1990) https://doi.org/10.1117/12.34952
Event: ICALEO89, 1989, Orlando, FL, United States

Abstract

The role in flow research of the Laser-2-Focus velocimeter, also known as the Laser Transit Velocimeter, is discussed. This technique measures the time of flight of small tracer particles as they cross an optical gate formed by two highly focused laser beams. It is applicable to study laminar flows in different directions. The physical properties of the technique are outlined and compared to those of the laser Doppler technique. The relation between measurement time and turbulence intensity is estimated and solutions are proposed that make the L2F technique suitable for measurements in flows of higher turbulence intensities.

Citation Download Citation

Helmut Selbach "Mapping of velocity flow fields using the laser two focus technique", Proc. SPIE 1404, ICALEO '89: Optical Methods in Flow and Particle Diagnostics, (1 November 1990); https://doi.org/10.1117/12.34952

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