Dynamics study (finished)

The project has two main aims strictly connected with optoelectronic measuring systems used in the study of dynamics of mechanical objects. The firs aim is to propose algorithmic solution, investigate and compare the accuracy of the group of methods of automatic analysis of fringe patterns used for processing images in which the intensity distribution is described by a function other than the harmonic function. An example of this type of images is fringe distribution described by zero-order Bessel function of first kind Jo. Images of this type are obtained e.g., in the measurement of resonance vibrations of mechanical, electrical and electronic objects with optical methods (mainly time-averaging interferometric methods). Processing of besselogram (evaluated interferogram contrast map), in order to recover the information encoded in its argument, is a very difficult task due to the non periodic and non injective character of the function. The works carried out within the project work allow examining whether it is possible (and with what accuracy) to retrieve the quantitative information from fringe patterns described by Bessel function Jo.

The second main objective of the project is to analyze the possibility of using (the scope of work also includes the construction of a measuring system) modern Smart-Pixel Camera in full-field heterodyne interferometer for mechanical objects dynamics (e.g., resonant vibration of MEMS microdevices) testing. Up to now heterodyne interferometers were so called point-wise measuring systems (measurements were carried out in single measuring point). In order to measure the object over the entire field a specially developed scanning system constructions were required. Application of Smart-Pixel Camera (with I/Q demodulators in each pixel) allow constructing full-field heterodyne interferometer with no additional scanning systems required.[more]

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