Visualization of sound generation: special imaging techniques

Hahlweg, Cornelius; Skaloud, Daniel C.; Gutzmann, Holger L.; Kutz, Sascha; Rothe, Hendrik

doi:10.1117/12.2022268

Cited by 1 publication

(1 citation statement)

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“…3,27 In recent years we investigated optical imaging methods which use field distributions between the object itself and the far field for image formation. [28][29][30][31] A typical example is the well-known shadowgraph method for visualization of processes in transparent media, which is closely related to the schlieren technique. [32][33][34][35][36][37][38] The shadowgraph technique images the field distribution of the geometrical shadow of the object.…”

Section: Problem Statementmentioning

confidence: 99%

Near-field imaging techniques for surface inspection

Dannenberg

Hahlweg

Pescoller³

et al. 2014

SPIE Proceedings

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Following the recent work on the characterization of flexo-printing plates a concept for inspection of glossy surfaces using a defined out of focus image of the surface under parallel illumination is presented, which in principle represents a near field distribution of the reflection function of the surface. The image turns out to be equivalent to a focussed shadowgraph as used for the investigation of processes in transparent media. Beside the plain 'reflected shadow imaging' several degrees of freedom can be exploited for configuration of the feature emphasis. The method is especially interesting for the quality control of printed matter. In the paper the definition of the system, the mechanism of the imaging process and its relation to the real image of the surface itself are considered. Further, questions of resolution, extractable features and extended applications are discussed.

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