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Title: Wavelet analysis of speckle patterns with a temporal carrier
Authors: Fu, Yu
Tay, Cho Jui
Quan, Chenggen
Miao, Hong
Keywords: DRNTU::Science::Physics::Optics and light
Issue Date: 2005
Source: Fu, Y., Tay, C. J., Quan, C., & Miao, H. (2005). Wavelet analysis of speckle patterns with a temporal carrier, Applied Optics, 44(6), 959-965.
Series/Report no.: Applied Optics
Abstract: A novel temporal phase-analysis technique that is based on wavelet analysis and a temporal carrier is presented. To measure displacement on a vibrating object by using electronic speckle pattern interferometry, one captures a series of speckle patterns, using a high-speed CCD camera. To avoid ambiguity in phase estimation, a temporal carrier is generated by a piezoelectric transducer stage in the reference beam of the interferometer. The intensity variation of each pixel on recorded images is then analyzed along the time axis by a robust mathematical tool, i.e., a complex Morlet wavelet transform. After the temporal carrier is removed, the absolute displacement of a vibrating object is obtained without the need for temporal or spatial phase unwrapping. The results obtained by a wavelet transform are compared with those from a temporal Fourier transform.
ISSN: 0003-6935
Rights: This paper was published in [Applied Optics] and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website:[]. Systematic or multiple reproduction or distribution to multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:TL Journal Articles

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