This paper presents a review of modern-day schlieren optics system and its application. Schlieren
imaging systems provide a powerful technique to visualize changes or nonuniformities in refractive index
of air or other transparent media. For over two centuries, schlieren systems were typically implemented
for a wide variety of non-intrusive real-time fluid dynamics studies. With the popularization of computational
imaging techniques and widespread availability of digital imaging systems, schlieren systems
provide novel methods of viewing transparent flow. Innovations such as background-oriented schlieren,
rainbow schlieren interferometry, and synthetic schlieren imaging have built upon the fundamentals
of schlieren imaging to provide less ambiguous, quantifiable studies of schlieren systems. This paper
presents a historical background of the technique, describes the methodology behind the system, presents
a mathematical proof of schlieren fundamentals, and lists various recent applications and advancements
in schlieren studies.
This paper presents a review of modern-day schlieren optics system and its application. Schlierenimaging systems provide a powerful technique to visualize changes or nonuniformities in refractive indexof air or other transparent media. For over two centuries, schlieren systems were typically implementedfor a wide variety of non-intrusive real-time fluid dynamics studies. With the popularization of computationalimaging techniques and widespread availability of digital imaging systems, schlieren systemsprovide novel methods of viewing transparent flow. Innovations such as background-oriented schlieren,rainbow schlieren interferometry, and synthetic schlieren imaging have built upon the fundamentalsof schlieren imaging to provide less ambiguous, quantifiable studies of schlieren systems. This paperpresents a historical background of the technique, describes the methodology behind the system, presentsa mathematical proof of schlieren fundamentals, and lists various recent applications and advancementsin schlieren studies.
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