Instrumentation, Techniques, and Measurement

Performance comparison of background-oriented schlieren and fringe deflection in temperature measurement: part I. Numerical evaluation

[+] Author Affiliations
Alan Blanco, Bernardino Barrientos, Carlos Mares

Centro de Investigaciones en Óptica A. C., Loma del Bosque 115, Col. Lomas del Campestre, 37150, León, Guanajuato, México

Opt. Eng. 55(5), 054102 (May 05, 2016). doi:10.1117/1.OE.55.5.054102
History: Received December 18, 2015; Accepted April 11, 2016
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Abstract.  Numerical comparisons of temperature measurement through background-oriented schlieren (BOS) and fringe deflection (FD) are presented. Both techniques are based on ray deflection and on the comparison of two different states of a region of observation. A background image displayed on a screen is used in both techniques: for BOS, randomly located spots, and for FD, sinusoidal straight fringes. When a phase object is incorporated into the layout, these spatial structures undergo displacements that are proportional to the gradient of the change of index of refraction. These displacement fields are calculated through digital correlation in BOS and by means of the Fourier phase extraction method in FD. Numerical simulations that model a flame issued by a gas nozzle are presented. The results show that FD presents a slightly larger accuracy for images that either contain relatively high temperature gradients or show low contrast.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Alan Blanco ; Bernardino Barrientos and Carlos Mares
"Performance comparison of background-oriented schlieren and fringe deflection in temperature measurement: part I. Numerical evaluation", Opt. Eng. 55(5), 054102 (May 05, 2016). ; http://dx.doi.org/10.1117/1.OE.55.5.054102


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