Instantaneous, three-component planar Doppler velocimetry using imaging fibre bundles
This paper describes a planar Doppler velocimetry (PDV) technique that is capable of measuring the three, instantaneous and time average components of velocity over two spatial dimensions using a single pair of signal and reference cameras. The three views required to obtain three-component velocity information are guided from the collection optics to a single imaging plane using flexible fibre imaging bundles. These are made up of a coherent array of single fibres and are combined at one end as the input plane to the measurement head. Measurements of the velocity field of a rotating disk are used in the development of the technique and initial results of the instantaneous velocity field of a jet are presented.
KeywordsReference Image Laser Frequency Scattered Signal Laser Speckle Instantaneous Velocity Field
The work was funded by Engineering and Physical Research Sciences (EPSRC) UK, and The Royal Society (UK).
- Forkey JN (1996) Development and demonstration of filtered Rayleigh scattering—a laser based flow diagnostic for planar measurements of velocity, temperature, and pressure. Final Technical Report for NASA Graduate Student Researcher, Fellowship Grant #NGT-50826, Princeton UniversityGoogle Scholar
- Komine H (1990) System for measuring velocity field of fluid flow utilizing a laser-Doppler spectral image converter. US Pat No. 4,919,536Google Scholar
- Meyers JF (1991) Generation of particles and seeding. Von Karman Institute Lecture Series 1991-08. Available from NASA Report ServerGoogle Scholar
- Meyers JF, Fleming GA, Althoff Gorton S, Berry JD (1998) Instantaneous Doppler global velocimetry measurements of a rotor wake: lessons learned. In Proceedings of the Ninth International Symposium on Applications of laser techniques to fluid mechanics, Lisbon, Portugal, 13–16 JulyGoogle Scholar
- Meyers JF, Komine H (1991) Doppler global velocimetry: a new way to look at velocity. Laser Anemometry 1:289–296Google Scholar
- Mosedale AD, Elliott GS, Carter CD, Beutner TJ (2000) Planar Doppler velocimetry in a large-scale facility. AIAA J 38:1010–1024Google Scholar
- Nobes DS, Ford HD, Tatam RP (2002) Three dimensional planar Doppler velocimetry using imaging fiber bundles. In Fortieth AIAA Aerospace Sciences Meeting and Exhibit, Reno, Nevada, 14–17 January 2002. AIAA, Reston, Va.Google Scholar
- Reinath MS (1997) Doppler global velocimeter development for the large wind tunnels at Ames Research Center. NASA TM-112210Google Scholar
- Samimy M, Wernet MP (2000) Review of planar multiple-component velocimetry in high speed flows. AIAA J 38:553–574Google Scholar
- Smith M, Northam G, Drummond P (1996) Application of absorption filter planar velocimetry to sonic and supersonic jets. AIAA J 34:434–441Google Scholar
- Tropea C (ed) (2001) Special feature: Molecular filter based diagnostics. Meas Sci Technol vol 12Google Scholar