منابع مشابه
Extended-range temporal electronic speckle pattern interferometry.
In recent years the availability of high-speed digital video cameras has motivated the study of electronic speckle pattern interferometry (ESPI) in the time domain. To this end a properly sampled temporal sequence of N-fringe patterns is used to analyze the temporal experiment. Samples of temporal speckle images must fulfill the Nyquist criteria over the time axis. When the transient phenomena ...
متن کاملOblique incidence and observation electronic speckle-pattern interferometry.
In this paper we discuss an oblique incidence and observation electronic speckle-pattern interferometer, in which we use an anamorphic prism in front of the object. A collimated beam traveling through the prism is partly reflected at the base of the prism. The reflected light is the reference beam and the transmitted light illuminates the diffuse object, thereby generating the object beam. In t...
متن کاملPhase Unwrapping of Electronic Speckle Pattern Interferometry Maps
This paper aims to provide an effective and distortion-free approach for the phase unwrapping of digital speckle pattern interferometry (ESPI) maps. ESPI is a very powerful measurement tool among industrial users. However, high percentages of noise are present in the experimental data obtained from the method and, therefore, most phase unwrapping algorithms fail to restore the correct phase fil...
متن کاملNondestructive Evaluation of Automobile Tires by Electronic Speckle Pattern Interferometry
Electronic speckle pattern interferometry (ESPI) was used for the evaluation of mechanical properties of automobile tires. The tire on wheel disc was fixed on the holder and its vibration was generated by loudspeaker. Vibrational field of the whole tire was visualized by ESPI and recorded into PC. Natural frequencies of various vibrational modes were measured and results were compared with thos...
متن کاملContouring by electronic speckle pattern interferometry employing dual beam illumination.
In this paper we extend and study the method for generating contours of diffuse objects employing a dual beam illumination coupled with electronic speckle pattern interferometry. The sensitivity and the orientation of the contour planes are analyzed. A novel method for tilting the planes of contours and experimental results incorporating phase shifting and fringe analysis are also presented. Th...
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ژورنال
عنوان ژورنال: Physics and High Technology
سال: 2011
ISSN: 1225-2336
DOI: 10.3938/phit.20.039