Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Jacques Lewandowski"'
Autor:
Murielle Kirkove, Jacques Lewandowski, Louis-Daniel Théroux, Marc Georges, Pascal Blain, Fabian Languy, Jean-François Vandenrijt
Publikováno v:
SPIE Proceedings.
Locating defects in CFRP composite materials is a hot topic in nondestructive inspection (NDI). Beside classical NDI technique, such as ultrasound testing (UT), contactless techniques are actively studied. Generally manufacturers of CFRP structure in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b2ab38fbad43a377fcf5d88476000e2
https://doi.org/10.1117/12.2271701
https://doi.org/10.1117/12.2271701
Autor:
Jacques Lewandowski, Lyne Desjardins
Publikováno v:
SPIE Proceedings.
The optical system proposed combines together the axial motion technique (where the camera remains motionless during the experiment measuring absolute range) with the triangulation technique giving relative range with respect to a reference point. Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b5cf22170ff59d59dd91b763e765efa
https://doi.org/10.1117/12.230404
https://doi.org/10.1117/12.230404
Publikováno v:
SPIE Proceedings.
We present an active triangulation based system for 3D reconstruction of objects with large depth variations which are placed on a rotary table to obtain the entire 3D view. We project Fresnel diffraction from an edge to generate an illumination patt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf07e367b9c85fab9feef5989c7b90ef
https://doi.org/10.1117/12.194345
https://doi.org/10.1117/12.194345
Publikováno v:
SPIE Proceedings.
The phase-coded image of a scene results from the projection of a grid on the objects of the scene. We show how the wavelet transform can be used as an oriented pattern detector for the segmentation of phase-coded images. The detector coupled with a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0f0dc28760be3ab822c6f284ce2e5b74
https://doi.org/10.1117/12.188798
https://doi.org/10.1117/12.188798
Autor:
Jacques Lewandowski, Lyne Desjardins
Publikováno v:
SPIE Proceedings.
Light sectioning computes the object profile using the line deformation seen by a CCD camera. Due to the low magnification between the object and the CCD plane, the image line deformation is small and leads to low resolution on profile measurements.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae5c65ac6ae8f31a470aade56ff31b61
https://doi.org/10.1117/12.198846
https://doi.org/10.1117/12.198846
Publikováno v:
SPIE Proceedings.
A thin oil film on a glass substrate has been subjected to thermal stimulation by means of incident infrared (10.6 micrometers ) laser beams, which were mostly absorbed in the substrate, in order to develop an appropriate real-time recording medium f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aa8e14abd630c75fed11fcabd2481d6a
https://doi.org/10.1117/12.47053
https://doi.org/10.1117/12.47053
Autor:
Jacques Lewandowski
Publikováno v:
SPIE Proceedings.
An infrared (10 μm) wave front is recorded holographically on a dynamic recording medium consisting of a thin oil film on a glass substrate. The phase hologram obtained is used to restore the information of the infrared wave front or alternatively a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe9e460c87b416a90a91af02b2ac6926
https://doi.org/10.1117/12.961321
https://doi.org/10.1117/12.961321
Autor:
Jacques Lewandowski, Lyne Desjardins
Publikováno v:
Optical Engineering. 34:2481
Light sectioning of an object surface uses the line deformation imaged by a CCD camera to compute the object profile. Because of the low optical magnification between the object and the CCD image plane, the measured CCD line deformation is small and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1f871f3a0b9d9ba4a2d66f1ddb384ea0
https://doi.org/10.1117/12.207140
https://doi.org/10.1117/12.207140
Publikováno v:
Optical Engineering. 32:2181
We propose the use of Fresnel diffraction from an edge to produce a fringe pattern illumination with large depth of focus. The line separating dark and bright areas of the fringe pattern is used for light sectioning of the object, and the height prof
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bb69b9816ee3568e3c4342f11a9da243
https://doi.org/10.1117/12.145054
https://doi.org/10.1117/12.145054
Publikováno v:
Journal of Applied Physics. 60:3407-3413
The two infrared (10‐μm) wave fronts of an interferometer (Michelson or Mach‐Zehnder) interfere separately with a tilted reference beam on a dynamic recording medium consisting of a thin oil film on a glass substrate. Illumination of this twin h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a69ae0b1ab4e03dc0c9e3c6965fa2e39
https://doi.org/10.1063/1.337638
https://doi.org/10.1063/1.337638