Synthetic Aperture Focusing Technique 3D-CAD-SAFT

Schmitz, V.; Kro¨ning, M.; Chakhlov, S.; Fischer, W.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p873
Academic Journal
Till the 80’s ultrasonic holography has been used as an analyzing technique, a procedure which has been replaced by the Synthetic Aperture Focusing Technique “SAFT.” This technique has been applied on metallic components in different power plants, mostly on pipe systems on pressure vessels or on specimen made of composite or concrete material. SAFT exists in different versions, either in 2D or 3D, for plane or arbitrarily shaped surfaces, for pulse echo or pitch- and catch arrangements. The defect sizes ranged from 100 μm in turbine shafts till fractures of meters in research pressure vessels. The paper covers the lastest results of the SAFT-reconstruction technique under Windows NT which has been guided by the experience obtained in the field. It contributes to the currently discussed question of the possible benefit using TOFD—techniques versus pulse echo techniques; the target has been a fatigue crack in a pipe segment which was investigated by different insonification angles, wave modes and probe arrangements. The results are evaluated with respect to signal-to-noise ratio improvement; problems of TOFD are demonstrated using an animation procedure which allows to walk through the weld in three orthogonal directions. A special example will be shown from a bore hole inspection of water power station valves where the reconstruction procedure follows the radial axial insonification planes. The multi-line SAFT images can be cut according to the situation of the crack position and orientation. © 2000 American Institute of Physics.


Related Articles

  • Advanced Stochastic Models for Partially Developed Speckle. Daba, Jihad S.; Dubois, Jean-Pierre; Jreije, Philip // Proceedings of World Academy of Science: Engineering & Technolog;Jul2008, Vol. 43, p567 

    Speckled images arise when coherent microwave, optical, and acoustic imaging techniques are used to image an object, surface or scene. Examples of coherent imaging systems include synthetic aperture radar, laser imaging systems, imaging sonar systems, and medical ultrasound systems. Speckle...

  • Acoustic planar hyperlens based on anisotropic density-near-zero metamaterials. Yuan Gu; Ying Cheng; Xiaojun Liu // Applied Physics Letters;9/28/2015, Vol. 107 Issue 13, p1 

    Based on anisotropic density-near-zero metamaterials, we demonstrate a planar hyperlens with resolution beyond the diffraction limit in both one and two lateral dimensions. In contrast to the cylindrical hyperlens with elliptical dispersions of finite anisotropy, the proposed planar hyperlens is...

  • Radar, Part 8--Synthetic-Aperture Radars. Adamy, Dave // Journal of Electronic Defense;Dec2000, Vol. 23 Issue 12, p66 

    Part VIII. Features the synthetic-aperture radar. Range resolution; Azimuth resolution; Focused-array SAR.

  • Alternating-aperture masks ready for dense patterns. Ebihara, Takeaki; Morikawa, Yasutaka // Solid State Technology;Dec2003, Vol. 46 Issue 12, p28 

    Features alternating-aperture phase-shifting masks (Alt-PSM) that rely on the fact that photoresists are insensitive to the phase of the light exposing them. Use of Alt-PSM to pattern relatively isolated narrow gates on microprocessor and ASIC chips; Key features and specifications;...

  • Summary Report. Thiessen, Henry A. // AIP Conference Proceedings;2002, Vol. 642 Issue 1, p139 

    We discuss here the status of dynamic aperture calculations for the various machines discussed at this workshop. We recommend that these calculations be extended to include all magnet field errors and alignment errors as quickly as possible.

  • Rotating radar gives helicopters new vision.  // Electronic Design;11/6/95, Vol. 43 Issue 23, p30 

    Informs about the development a novel synthetic-aperture radar (SAR) system that allows pilots to land in near-zero visibility conditions. Enlargement of the radar's viewing area; Processing of the radar system by developed algorithms; Operation of the system.

  • Space-borne radar will revolutionize hazard watching. P.McG. // Electronic Design;03/03/97, Vol. 45 Issue 5, p28 

    Reports on the invention of the synthetic aperture radar (SAR) interferometry that uses radar pictures taken from 500 miles or more up in space to track tiny movements in the surface of the Earth. SAR's use to map the surface of the planet Venus; SAR's capability to circle the earth, mapping...

  • Synthetic Aperture Radar as a Tool for Investigating Polar Mesoscale Cyclones. Sikora, Todd D.; Friedman, Karen S.; Pichel, William G.; Clemente-Colon, Pablo // Weather & Forecasting;Dec2000, Vol. 15 Issue 6, p745 

    Polar mesoscale cyclones are intense vortices that form in cold, marine air masses poleward of major jet streams and frontal zones. Synthetic aperture radar (SAR) should be considered as a potential tool for the study of polar mesoscale cyclones because of its ability to remotely sense, at...

  • SAR poised to assume center stage in U.S. reconnaissance. McAuliffe, Amy // Military & Aerospace Electronics;Feb96, Vol. 7 Issue 2, p10 

    Analyzes synthetic aperture radar (SAR) technology. List of SAR-equipped fighter planes; Benefits; Setbacks; Role of commercial-off-the-shelf (COTS) technology; Product features and capabilities of ASARS 2; Planned future enhancements. INSETS: Real-time software: Just what SAR ordered, by...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics