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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 15 — May. 20, 2007
  • pp: 2954–2962

Miniature rainbow schlieren deflectometry system for quantitative measurements in microjets and flames

Rajani P. Satti, Pankaj S. Kolhe, Semih Olcmen, and Ajay K. Agrawal  »View Author Affiliations

Applied Optics, Vol. 46, Issue 15, pp. 2954-2962 (2007)

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Recent interest in small-scale flow devices has created the need for miniature instruments capable of measuring scalar flow properties with high spatial resolution. We present a miniature rainbow schlieren deflectometry system to nonintrusively obtain quantitative species concentration and temperature data across the whole field. The optical layout of the miniature system is similar to that of a macroscale system, although the field of view is smaller by an order of magnitude. Employing achromatic lenses and a CCD array together with a camera lens and extension tubes, we achieved spatial resolution down to 4   μm . Quantitative measurements required a careful evaluation of the optical components. The capability of the system is demonstrated by obtaining concentration measurements in a helium microjet (diameter, d = 650   μm ) and temperature and concentration measurements in a hydrogen jet diffusion flame from a microinjector ( d = 50   μm ) . Further, the flow field of underexpanded nitrogen jets is visualized to reveal details of the shock structures existing downstream of the jet exit.

© 2007 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.6780) Instrumentation, measurement, and metrology : Temperature

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: August 14, 2006
Revised Manuscript: December 10, 2006
Manuscript Accepted: December 11, 2006
Published: May 1, 2007

Rajani P. Satti, Pankaj S. Kolhe, Semih Olcmen, and Ajay K. Agrawal, "Miniature rainbow schlieren deflectometry system for quantitative measurements in microjets and flames," Appl. Opt. 46, 2954-2962 (2007)

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