Identification of antinodes and zero-surface-strain contours of flexural vibration with time-averaged speckle pattern shearing interferometry
نویسندگان
چکیده
منابع مشابه
Dynamic Corneal Surface Mapping with Electronic Speckle Pattern Interferometry
In view of the fast advancement in ophthalmic technology and corneal surgery, there is a strong need for the comprehensive mapping and characterization techniques for corneal surface. Optical methods with precision non-contact approaches have been found to be very useful for such bio measurements. Along with the normal mapping approaches, elasticity of corneal surface has an important role in i...
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We propose an effective image denoising filter, which combines an improved spin filter (ISF) and wave atoms thresholding (WA), to remove the noise of fringe patterns in electronic speckle shearing pattern interferometry (ESSPI). The WA is firstly employed to denoise the fringe to save the processing time, and then the ISF is further used to remove noise of the denoised image using WA to obtain ...
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Time-averaged in-line digital holography is applied for vibration analysis. In particular, by use of a double-exposure approach, simultaneous determination of vibration mode shape and mean static state deformation during a vibration cycle are obtained. The subtraction of two numerically reconstructed digital holograms recorded at the same resonant frequency but with a small difference in amplit...
متن کاملElectronic Speckle Pattern Shearing Interferometry for Nondestructive Testing of Thermal Sprayed Alloy Coatings
Thermal sprayed coatings have wide engineering applications. There now exists a wide range of destructive and nondestructive testing (NDT) methods for surface coating inspections. This paper describes an application of Electronic Speckle Pattern Shearing Interferometry (ESPSI) for NDT of thermal sprayed surface coatings. In contrast to other conventional methods such as eddy current, ultrasonic...
متن کاملTime-averaged electronic speckle pattern interferometry in the presence of ambient motion. Part I. Theory and experiments.
An electronic speckle pattern interferometer is introduced that can produce time-averaged interferograms of harmonically vibrating objects in instances where it is impractical to isolate the object from ambient vibrations. By subtracting two images of the oscillating object, rather than the more common technique of subtracting an image of the oscillating object from one of the static objects, i...
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ژورنال
عنوان ژورنال: Applied Optics
سال: 1997
ISSN: 0003-6935,1539-4522
DOI: 10.1364/ao.36.003776