Two-dimensional quantification of the corrosion process in metal surfaces using digital speckle pattern interferometry

Andrés, Nieves; Lobera, Julia; Arroyo, M. P.; Angurel, L.A.

doi:10.1364/ao.50.001323

Cited by 16 publications

(11 citation statements)

References 16 publications

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“…using a VanderLugt 4F correlator with a matched filter for nondestructively monitoring structural changes in a surface [9]. Later, digital speckle correlation was implemented for a variety of surface studies [10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Implementation of a speckle-correlation-based optical lever with extended dynamic range

Anand

Jayavel

et al. 2019

Appl. Opt.

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A speckle correlation based optical lever (SC-OptLev) is constructed for the measurement of small changes in the angle of orientation of a surface. The dynamic range of SC-OptLev is found to be twice that of a conventional OptLev for the same experimental configurations. Different filtering mechanisms are implemented and the correlation results are compared. Two types of computer automated SC-OptLevs, open source based computing system with a low-cost image sensor and a commercial computing system, are presented with assistive computational modules.

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Section: Introductionmentioning

confidence: 99%

Implementation of a speckle-correlation-based optical lever with extended dynamic range

Anand

Jayavel

et al. 2019

Appl. Opt.

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“…Alternatively, structured light techniques with spatial calibration were developed to measure tilts 27 . Currently, the speckle correlation technique is used as a sensing tool for various applications such as measurement of random processes in rough surfaces 28,29 , quantification of the corrosion process 30 , surface slope, deformation and motion measurements 31–35 , and sub-micrometer displacement measurement 36 .…”

Section: Introductionmentioning

confidence: 99%

Spatial Multiplexing Technique for Improving Dynamic Range of Speckle Correlation based Optical Lever

Anand

Bhattacharya

Rosen

2019

Sci Rep

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Speckle correlation based optical levers (SC-OptLev) possess attractive characteristics suitable for sensing small changes in the angular orientations of surfaces. In this study, we propose and demonstrate a spatial multiplexing technique for improving the dynamic range of SC-OptLev. When the surface is in its initial position, a synthetic speckle intensity pattern, larger than the area of the image sensor is created by transversely shifting the image sensor and recording different sections of a larger speckle pattern. Then, the acquired images are stitched together by a computer program into one relatively large synthetic speckle pattern. Following the calibration stage, the synthetic speckle intensity pattern is used to sense changes in the surface’s angular orientation. The surface is monitored in real-time by recording part of the speckle pattern which lies within the sensor area. Next, the recorded speckle pattern is cross-correlated with the synthetic speckle pattern in the computer. The resulting shift of the correlation peak indicates the angular orientations of the reflective surface under test. This spatial-multiplexing technique enables sensing changes in the angular orientation of the surface beyond the limit imposed by the physical size of the image sensor.

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“…14 Digital speckle pattern interferometry (DSPI) has been employed to measure the thickness of the corrosion layer in a metallic surface but the sample had to be removed from the corrosion media before recording each image. 17 As in many cases corrosion processes take place when the metallic surface is immersed in liquids, the possibility of measuring changes in the surface during the dynamic process would be very useful. For measurements inside liquids, concentration gradients, liquid movements, or changes in the refractive index can have a very important influence on the optical results limiting the applicability of the technique in these conditions.…”

Section: Introductionmentioning

confidence: 99%

Application of digital speckle interferometry to visualize surface changes in metallic samples immersed in Cu(NO3)2 solutions

et al. 2013

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Digital speckle pattern interferometry (DSPI) has been applied to analyze surface corrosion processes in a metallic sample immersed in a 0.1 M CuðNO 3 Þ 2 solution. The corrosion process induces changes in the surface and in the solution refractive index. A detailed analysis of the DSPI measurements has been performed to obtain a two-dimensional visualization of the surface changes and an evaluation of the refractive index changes of the solution. The possibilities of DSPI for measuring surface changes in these conditions have been analyzed.

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Two-dimensional quantification of the corrosion process in metal surfaces using digital speckle pattern interferometry

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Cited by 16 publications

References 16 publications

Implementation of a speckle-correlation-based optical lever with extended dynamic range

Implementation of a speckle-correlation-based optical lever with extended dynamic range

Spatial Multiplexing Technique for Improving Dynamic Range of Speckle Correlation based Optical Lever

Application of digital speckle interferometry to visualize surface changes in metallic samples immersed in Cu(NO3)2 solutions

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