Single camera three component planar velocity measurements using two-frequency planar Doppler velocimetry (2ν-PDV)

Two-frequency planar Doppler velocimetry (2ν-PDV) is used in conjunction with imaging fibre bundles to make time-averaged three component velocity measurements using a single CCD camera and iodine cell. In this scheme the flow is sequentially illuminated with two different frequencies of laser light, which are separated by approximately 700 MHz to 1 GHz. Images are captured for each illumination frequency on a CCD camera viewing through an iodine absorption filter. These images are then used to produce a normalized transmission image that can be processed as in normal PDV. Three component measurements are made possible by porting separate views to a single CCD camera using the imaging fibre bundles. Results are presented here for a 2ν-PDV system demonstrated making time-averaged velocity measurements on a rotating disc and a seeded air jet.

[1]  Ralph P. Tatam,et al.  Instantaneous two-camera three-dimensional planar Doppler velocimetry using imaging fiber bundles , 2001, SPIE Optics + Photonics.

[2]  Ralph P. Tatam,et al.  Acousto-optic frequency switching for single-camera planar Doppler velocimetry , 2001, SPIE Optics + Photonics.

[3]  Hiroshi Komine,et al.  Real-time, Doppler global velocimetry , 1990 .

[4]  J. W. Lee,et al.  Proof of Concept Test of the Doppler Global Velocimeter , 1991, LEOS 1991 Summer Topical Meetings on Spaceborne Photonics: Aerospace Applications of Lasers and Electro-Optics, Optical Millimeter-Wave Interactions: Measurements, Generation, Transmission and Control.

[5]  M. Beversdorff,et al.  Application of Doppler global velocimetry in cryogenic wind tunnels , 2005 .

[6]  Two-Color Planar Doppler Velocimetry , 2000 .

[7]  Thomas O. H. Charrett,et al.  Dual-illumination planar Doppler velocimetry using a single camera , 2003, SPIE Optics + Photonics.

[8]  James F. Meyers,et al.  Identification and Minimization of Errors in Doppler Global Velocimetry Measurements , 2000 .

[9]  Gregory S Elliott,et al.  Molecular filter based planar Doppler velocimetry , 1999 .

[10]  J. T. Turner,et al.  Iodine absorption filters for Doppler global velocimetry , 1995 .

[11]  Bernhard Wieneke,et al.  Determination of view vectors from image warping mapping functions , 2004 .

[12]  Michael S. Reinath.  Doppler Global Velocimeter Development for the Large Wind Tunnels at Ames Research Center , 1997 .

[13]  Christian Willert,et al.  Extension of Doppler global velocimetry to periodic flows , 2001 .

[14]  R. Tatam,et al.  In-line laser Doppler velocimeter using fibre-optic Bragg grating interferometric filters , 2003 .

[15]  Michael S Reinath.  Doppler global velocimeter development for large wind tunnels , 2001 .

[16]  Johannes Heinze,et al.  Doppler Global Velocimetry in flames using a newly developed, frequency stabilized, tunable, Long pulse, Nd: YAG Laser , 2000 .

[17]  R. J. Schwartz,et al.  Characterization of measurement error sources in Doppler global velocimetry , 2001 .

[18]  Thomas O. H. Charrett,et al.  Two-frequency planar Doppler velocimetry (2ν-PDV) , 2004 .

[19]  Mo Samimy,et al.  Review of Planar Multiple-Component Velocimetry in High-Speed Flows , 2000 .

[20]  Christian Willert,et al.  Recent developments and applications of quantitative laser light sheet measuring techniques in turbomachinery components , 2000 .

[21]  Ikuo Ihara,et al.  Ultrasonic probes for high temperature immersion measurements , 2001 .

[22]  Ralph P. Tatam,et al.  Planar Doppler velocimetry measurements of flows using imaging fiber bundles , 2003, SPIE Optics + Photonics.

[23]  T. J. Quinn,et al.  A new type of iodine cell for stabilized lasers , 1993 .

[24]  Ralph P. Tatam,et al.  Instantaneous, three-component planar Doppler velocimetry using imaging fibre bundles , 2002 .

[25]  Ralph P. Tatam,et al.  In-line fiber optic laser Doppler velocimetry , 2001, SPIE Optics + Photonics.

[26]  Ralph P. Tatam,et al.  Development of extended field Doppler velocimetry for turbomachinery applications , 1997 .