Miniature rainbow schlieren deflectometry system for quantitative measurements in microjets and flames
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 {mu}m. 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 {mu}m) and temperature and concentration measurements in a hydrogen jet diffusion flame from a microinjector(d=50 {mu}m). Further, the flow field of underexpanded nitrogen jets is visualized to reveal details of the shock structures existing downstream of the jet exit.
- OSTI ID:
- 20929734
- Journal Information:
- Applied Optics, Vol. 46, Issue 15; Other Information: DOI: 10.1364/AO.46.002954; (c) 2007 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6935
- Country of Publication:
- United States
- Language:
- English
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