In the aviation industry, automated inspection is essential for ensuring quality of production. I... more In the aviation industry, automated inspection is essential for ensuring quality of production. It allows acceleration of procedures for quality control of parts or mechanical assemblies. As a result, the demand of intelligent visual inspection systems aimed at ensuring high quality in production lines is increasing. In this work, we address a very common problem in quality control. The problem is verification of presence of the correct part and verification of its position. We address the problem in two parts: first, automatic selection of informative viewpoints before the inspection process is started (offline preparation of the inspection) and, second, automatic treatment of the acquired images from said viewpoints by matching them with information in 3D CAD models is launched. We apply this inspection system for detecting defects on aeronautical mechanical assemblies with the aim of checking whether all the subparts are present and correctly mounted. The system can be used durin...
The goal of this work is to develop the methodology for obtaining accurate, three-dimensional mea... more The goal of this work is to develop the methodology for obtaining accurate, three-dimensional measurements of object deformation using a scanning electron microscope. Calibration methods are being developed for the SEM that include novel distortion correction approaches. The 3D reconstruction of the specimen surface is computed using multiple views acquired through motion of the SEM specimen's stage. Since the displacement information obtained from typical SEM stages is not sufficiently accurate for 3D deformation measurements, we are employing a photogrammetric approach to estimate the movements of the sample using specimen images. Using these results, the 3D deformation measurements are computed using a bundle adjustment method that is also common to a range of photogrammetric methods.
This paper presents a contribution to the joint in-situ measurement of strain and temperature by ... more This paper presents a contribution to the joint in-situ measurement of strain and temperature by using Fiber Bragg Gratings (FBG) sensor. FBG’s are particularly suited to measuring strain and temperature in smart structures, e.g. for composite laminate materials in-situ measurements [Botsis, J., Humbert, L., Colpo, F. and Giaccari, P., Opt. Las. Eng., vol. 43, 491–510, 2005.]. Advantages are weakly intrusive
The goal of this work is to develop the methodology for obtaining accurate, three-dimensional mea... more The goal of this work is to develop the methodology for obtaining accurate, three-dimensional measurements of object deformation using a scanning electron microscope. Calibration methods are being developed for the SEM that include novel distortion correction approaches. The 3D reconstruction of the specimen surface is computed using multiple views acquired through motion of the SEM specimen's stage. Since the displacement information obtained from typical SEM stages is not sufficiently accurate for 3D deformation measurements, we are employing a photogrammetric approach to estimate the movements of the sample using specimen images. Using these results, the 3D deformation measurements are computed using a bundle adjustment method that is also common to a range of photogrammetric methods.
Proceedings of SPIE - The International Society for Optical Engineering
We propose a framework for obtaining synthetic speckle-pattern images based on successive transfo... more We propose a framework for obtaining synthetic speckle-pattern images based on successive transformations of Perlin's coherent noise function. In addition we show how a given displacement function can be used to produce deformed images, making this framework suitable for performance analysis of speckle-based displacement/strain measurement techniques, such as Digital Image Correlation, widely used in experimental mechanics.
In the aviation industry, automated inspection is essential for ensuring quality of production. I... more In the aviation industry, automated inspection is essential for ensuring quality of production. It allows acceleration of procedures for quality control of parts or mechanical assemblies. As a result, the demand of intelligent visual inspection systems aimed at ensuring high quality in production lines is increasing. In this work, we address a very common problem in quality control. The problem is verification of presence of the correct part and verification of its position. We address the problem in two parts: first, automatic selection of informative viewpoints before the inspection process is started (offline preparation of the inspection) and, second, automatic treatment of the acquired images from said viewpoints by matching them with information in 3D CAD models is launched. We apply this inspection system for detecting defects on aeronautical mechanical assemblies with the aim of checking whether all the subparts are present and correctly mounted. The system can be used durin...
The goal of this work is to develop the methodology for obtaining accurate, three-dimensional mea... more The goal of this work is to develop the methodology for obtaining accurate, three-dimensional measurements of object deformation using a scanning electron microscope. Calibration methods are being developed for the SEM that include novel distortion correction approaches. The 3D reconstruction of the specimen surface is computed using multiple views acquired through motion of the SEM specimen's stage. Since the displacement information obtained from typical SEM stages is not sufficiently accurate for 3D deformation measurements, we are employing a photogrammetric approach to estimate the movements of the sample using specimen images. Using these results, the 3D deformation measurements are computed using a bundle adjustment method that is also common to a range of photogrammetric methods.
This paper presents a contribution to the joint in-situ measurement of strain and temperature by ... more This paper presents a contribution to the joint in-situ measurement of strain and temperature by using Fiber Bragg Gratings (FBG) sensor. FBG’s are particularly suited to measuring strain and temperature in smart structures, e.g. for composite laminate materials in-situ measurements [Botsis, J., Humbert, L., Colpo, F. and Giaccari, P., Opt. Las. Eng., vol. 43, 491–510, 2005.]. Advantages are weakly intrusive
The goal of this work is to develop the methodology for obtaining accurate, three-dimensional mea... more The goal of this work is to develop the methodology for obtaining accurate, three-dimensional measurements of object deformation using a scanning electron microscope. Calibration methods are being developed for the SEM that include novel distortion correction approaches. The 3D reconstruction of the specimen surface is computed using multiple views acquired through motion of the SEM specimen's stage. Since the displacement information obtained from typical SEM stages is not sufficiently accurate for 3D deformation measurements, we are employing a photogrammetric approach to estimate the movements of the sample using specimen images. Using these results, the 3D deformation measurements are computed using a bundle adjustment method that is also common to a range of photogrammetric methods.
Proceedings of SPIE - The International Society for Optical Engineering
We propose a framework for obtaining synthetic speckle-pattern images based on successive transfo... more We propose a framework for obtaining synthetic speckle-pattern images based on successive transformations of Perlin's coherent noise function. In addition we show how a given displacement function can be used to produce deformed images, making this framework suitable for performance analysis of speckle-based displacement/strain measurement techniques, such as Digital Image Correlation, widely used in experimental mechanics.
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