Digital speckle photography with the ring aperture diaphragm

Osipov, Michael N.; Sergeev, R.N.

doi:10.1016/j.proeng.2017.09.591

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…The speckle pattern is the carrier of information in the DSPI system. Speckle attributes not only affect the quality of speckle pattern, but also affect its stability [35]. Especially when the DSPI system is applied to high-precision strain detection of bioactive materials, speckle size plays a key role in the performance of the detection system.…”

Section: B Methods Of Controlling Speckle Sizementioning

confidence: 99%

Effect of the Speckle Size on the Quality of Speckle Pattern in DSPI System

Zhong

Tang

et al. 2019

IEEE Access

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In order to detect the deformation and strain of materials accurately, the key is to obtain the phase information caused by dynamic loading in digital speckle pattern interferometry (DSPI). In this paper, the evaluation method of quality of the speckle pattern in DSPI system is proposed, and the influence of the size of speckle grain on the stability and contrast of speckle pattern is discussed. And then, the strain detection experiments of inactive and bioactive materials are provided with different aperture slit size under the same detection conditions. The size of speckle grain has an important influence on the quality of speckle pattern. For strain detection of inactive materials, using the small size of speckles can obtain higher quality speckle pattern under the condition of satisfying the Nyquist theorem and spectral separation. For active biomaterials, non-structural factors easily induce the instability of speckle pattern, which leads to the decorrelation of between pre-deformation and post-deformation speckle pattern. So the compromise between the stability and the information capacity of speckle images should be considered in the selection of speckle size. Experiments show that the optimum size of speckles used for strain detection active biomaterials is larger than that of inactive biomaterials under the same conditions in the same DSPI system.

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Section: B Methods Of Controlling Speckle Sizementioning

confidence: 99%

Effect of the Speckle Size on the Quality of Speckle Pattern in DSPI System

Zhong

Tang

et al. 2019

IEEE Access

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The influence of the aperture diaphragm on the size of the subjective speckles and the application of this in speckle photography

Osipov

Sergeev

2019

J. Phys.: Conf. Ser.

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The paper presents the results of a study showing the possibility of reducing the size of speckles to increase the sensitivity and accuracy of the measuring system based at the use of methods of speckle photography and speckle interferometry. The theoretical and experimental results the average size of speckles formed in the double-exposure specklegram depends on the aperture diaphragms of the optical system – circular aperture, annular aperture, square aperture and frame aperture – are presented. The experimental results forming of the diffraction halo and the Young’s fringes for a circular, annular, square and frame apertures are presented.

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Analysis focused image formation in double exposure speckle photography

Osipov

Sergeev

2021

J. Phys.: Conf. Ser.

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This paper presents the theoretical and experimental results of the analysis of the formation of the focused image in a double-exposure speckle photography. Theoretical analysis of the formation of the focused image in double-exposure speckle photography was carried out using the Vander Lugt method. It is shown that as a result of the summation of speckle structures displaced in the space of the photographic plates, moiré fringes are formed in double-exposure speckle photography. Experimental results confirming theoretical studies are presented.

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Digital speckle photography with the ring aperture diaphragm

Cited by 4 publications

References 5 publications

Effect of the Speckle Size on the Quality of Speckle Pattern in DSPI System

Effect of the Speckle Size on the Quality of Speckle Pattern in DSPI System

The influence of the aperture diaphragm on the size of the subjective speckles and the application of this in speckle photography

Analysis focused image formation in double exposure speckle photography

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