Impact of Inhomogeneous Light Intensity on Test and Its Correction Method for Digital Speckle Interferometry with Substraction

Dongsheng, 何东升 He; Dexing, 杨德兴 Yang; Bin, 古彬 Gu; Zhiqiang, 方志强 Fang

doi:10.3788/aos20092902.0362

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Speckle produced when a diffusely surface rough on the scale of a wavelength，which illuminated by laser beam, has been widely developed as metrology methods and investigated for displacement and deformation measurement by many authors [1] [2] . As a branch of speckle Metrology and a well-established tool, Digital Speckle Pattern Interferometry (DSPI) has been used for whole-field methods to detect the deformation from static to dynamic [3] [4] .…”

Section: Introductionmentioning

confidence: 99%

Uniform illumination for large area digital speckle pattern interferometry using multibeam

et al. 2010

View full text Add to dashboard Cite

Using Digital Speckle Pattern Interferometry (DSPI) method measuring the large object in practice, the primarily problem is uniform illumination. This paper presents a method that using multiple laser beams to enlarge the illumination area and analysis the non-uniform illumination influences for interferogram. We design an illumination model using 10 semiconductor lasers for interferometer, and corresponding experiment shows that this method is suitable for industrial measurement in large area detection.

show abstract

Section: Introductionmentioning

confidence: 99%

Uniform illumination for large area digital speckle pattern interferometry using multibeam

et al. 2010

View full text Add to dashboard Cite

show abstract

Adaptive correction method of inhomogeneous light intensity for digital speckle interferometry by subtraction

Yang

et al. 2009

Appl. Opt.

View full text Add to dashboard Cite

In digital speckle interferometry, subtracted fringe patterns are always influenced by inhomogeneous light that is reflected from the tested object and received by the CCD. In this paper, by analyzing speckle's statistic property, we propose a numerical processing method to correct this nonuniform light intensity distribution within adaptive windows. This method includes estimating light intensity distribution of the tested object, constructing an adaptive window for every pixel, and correcting the intensity in the adaptive windows. By applying this method to our experiment, we find it is valid for intensity correction without changing necessary phase information.

show abstract

Investigation of Speckle Image Correction Technique Based on Coding Assistance

Yu¹,

Hua²,

Fan³

et al. 2016

Proceedings of the International Symposium on Mechanical Engineering and Material Science

View full text Add to dashboard Cite

The effect of image correction on digital speckle correlation method (DSCM) is researched. And the error caused by differences in attitude is analyzed. Then the theoretical model of image correction based on coding assistance is established. According to the model, computer simulation is conducted. The error of corrected image is significantly reduced after correlation calculation. The relationship between the angle of distortion and matching rate is studied in physical experiment, the error is obviously stabilized, so the accuracy is guaranteed basically. The result showed that speckle image correction technique based on coding assistance will be conductive to improve the measurement accuracy and sensitivity, and the measurement error will decrease from 0.05pixel to 0.01pixel.

show abstract

Impact of Inhomogeneous Light Intensity on Test and Its Correction Method for Digital Speckle Interferometry with Substraction

Cited by 3 publications

References 0 publications

Uniform illumination for large area digital speckle pattern interferometry using multibeam

Uniform illumination for large area digital speckle pattern interferometry using multibeam

Adaptive correction method of inhomogeneous light intensity for digital speckle interferometry by subtraction

Investigation of Speckle Image Correction Technique Based on Coding Assistance

Contact Info

Product

Resources

About