Image processing for interferometric Mie and Rayleigh scattering velocity measurements

D. Bivolaru, M. V. Ötügen, Antonios Tzes, G. Papadopoulos

Research output: Contribution to journalArticle

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 languageEnglish (US)
Pages (from-to)688-694
Number of pages7
JournalAIAA Journal
Volume37
Issue number6
DOIs
StatePublished - Jan 1 1999

Fingerprint

Rayleigh scattering
Velocity measurement
Image processing
Interferometers
Doppler effect
Fabry-Perot interferometers
Volume measurement
Lasers
CCD cameras
Autocorrelation
Image analysis
Mach number
Flow of gases
Processing

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 journalArticle

Bivolaru, D. ; Ötügen, M. V. ; Tzes, Antonios ; Papadopoulos, G. / Image processing for interferometric Mie and Rayleigh scattering velocity measurements. In: AIAA Journal. 1999 ; Vol. 37, No. 6. pp. 688-694.
@article{255c9beb802b4927ae88f4f241788a9c,
title = "Image processing for interferometric Mie and Rayleigh scattering velocity measurements",
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.",
author = "D. Bivolaru and {\"O}t{\"u}gen, {M. V.} and Antonios Tzes and G. Papadopoulos",
year = "1999",
month = "1",
day = "1",
doi = "10.2514/2.796",
language = "English (US)",
volume = "37",
pages = "688--694",
journal = "AIAA Journal",
issn = "0001-1452",
publisher = "American Institute of Aeronautics and Astronautics Inc. (AIAA)",
number = "6",

}

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.

UR - http://www.scopus.com/inward/record.url?scp=0344146566&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0344146566&partnerID=8YFLogxK

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 -