Abstract
An image-processing method that is used in conjunction with a Fabry-Perot interferometer has been developed for time-resolved local velocity measurements in gas flows. The processing method is used to determine the Doppler shift in Mie or Rayleigh scattered light from the measurement volume. The method minimizes the adverse effects due to the drifting of laser frequency and interferometer alignment. The scattered light is mixed with unshifted light from the interrogation laser for reference before it is passed through the interferometer. The concentric, double-ring pattern images (from both the signal and the reference light) formed at the output of the interferometer are captured by a charge-coupled device camera and analyzed for free spectral range and Doppler shift simultaneously using an autocorrelation technique. Measurements have been made in the near field of a Mach 1.6 supersonic jet to determine the structure of the velocity field. Velocity data obtained using the present image analysis technique has been compared with those obtained using a direct analysis method in the same jet.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 688-694 |
| Number of pages | 7 |
| Journal | AIAA Journal |
| Volume | 37 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jan 1 1999 |
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ASJC Scopus subject areas
- Aerospace Engineering
Cite this
Image processing for interferometric Mie and Rayleigh scattering velocity measurements. / Bivolaru, D.; Ötügen, M. V.; Tzes, Antonios; Papadopoulos, G.
In: AIAA Journal, Vol. 37, No. 6, 01.01.1999, p. 688-694.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Image processing for interferometric Mie and Rayleigh scattering velocity measurements
AU - Bivolaru, D.
AU - Ötügen, M. V.
AU - Tzes, Antonios
AU - Papadopoulos, G.
PY - 1999/1/1
Y1 - 1999/1/1
N2 - An image-processing method that is used in conjunction with a Fabry-Perot interferometer has been developed for time-resolved local velocity measurements in gas flows. The processing method is used to determine the Doppler shift in Mie or Rayleigh scattered light from the measurement volume. The method minimizes the adverse effects due to the drifting of laser frequency and interferometer alignment. The scattered light is mixed with unshifted light from the interrogation laser for reference before it is passed through the interferometer. The concentric, double-ring pattern images (from both the signal and the reference light) formed at the output of the interferometer are captured by a charge-coupled device camera and analyzed for free spectral range and Doppler shift simultaneously using an autocorrelation technique. Measurements have been made in the near field of a Mach 1.6 supersonic jet to determine the structure of the velocity field. Velocity data obtained using the present image analysis technique has been compared with those obtained using a direct analysis method in the same jet.
AB - An image-processing method that is used in conjunction with a Fabry-Perot interferometer has been developed for time-resolved local velocity measurements in gas flows. The processing method is used to determine the Doppler shift in Mie or Rayleigh scattered light from the measurement volume. The method minimizes the adverse effects due to the drifting of laser frequency and interferometer alignment. The scattered light is mixed with unshifted light from the interrogation laser for reference before it is passed through the interferometer. The concentric, double-ring pattern images (from both the signal and the reference light) formed at the output of the interferometer are captured by a charge-coupled device camera and analyzed for free spectral range and Doppler shift simultaneously using an autocorrelation technique. Measurements have been made in the near field of a Mach 1.6 supersonic jet to determine the structure of the velocity field. Velocity data obtained using the present image analysis technique has been compared with those obtained using a direct analysis method in the same jet.
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U2 - 10.2514/2.796
DO - 10.2514/2.796
M3 - Article
AN - SCOPUS:0344146566
VL - 37
SP - 688
EP - 694
JO - AIAA Journal
JF - AIAA Journal
SN - 0001-1452
IS - 6
ER -