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Applied Optics

Applied Optics


  • Vol. 37, Iss. 3 — Jan. 20, 1998
  • pp: 479–485

Three-dimensional rainbow schlieren tomography of a temperature field in gas flows

Ajay K. Agrawal, Nelson K. Butuk, Subramanyam R. Gollahalli, and DeVon Griffin  »View Author Affiliations

Applied Optics, Vol. 37, Issue 3, pp. 479-485 (1998)

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We present quantitative rainbow schlieren deflectometry with tomography for measurements of temperature in three-dimensional gas flows. The schlieren apparatus with a continuously graded spectral filter of known transmissivity was used to create color schlieren images of the test media. These images at multiple viewing angles were used to infer beam deflection angles by the medium. The deflection data were used with a tomographic technique to reconstruct the refractive index and thus the temperature field. The temperature distributions obtained by the rainbow schlieren tomography agreed with those measured by a thermocouple probe. This research demonstrates that tomography can be used with full-field schlieren deflectometry to measure quantitatively temperature in asymmetric gas flows. The technique could be used to obtain related properties such as pressure, density, and gas composition.

© 1998 Optical Society of America

OCIS Codes
(100.6890) Image processing : Three-dimensional image processing
(110.6960) Imaging systems : Tomography

Original Manuscript: March 20, 1997
Revised Manuscript: September 2, 1997
Published: January 20, 1998

Ajay K. Agrawal, Nelson K. Butuk, Subramanyam R. Gollahalli, and DeVon Griffin, "Three-dimensional rainbow schlieren tomography of a temperature field in gas flows," Appl. Opt. 37, 479-485 (1998)

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