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Saturday, August 8, 2020 | History

2 edition of Digital shearography found in the catalog.

Digital shearography

Wolfgang Steinchen

Digital shearography

theory and application of digital Speckle pattern shearing interferometry

by Wolfgang Steinchen

  • 305 Want to read
  • 34 Currently reading

Published by SPIE Press in Bellingham, Wash .
Written in English

    Subjects:
  • Holographic interferometry.,
  • Speckle.,
  • Nondestructive testing

  • Edition Notes

    Includes bibliographical references and index.

    Statementby Wolfgang Steinchen, Lianxiang Yang.
    ContributionsYang, Lianxiang.
    Classifications
    LC ClassificationsTA1555 .S74 2003
    The Physical Object
    Paginationxvii, 310 p. :
    Number of Pages310
    ID Numbers
    Open LibraryOL19493472M
    ISBN 100819441104

    Laser digitial shearography – NDT technique In Croucher Optical Nondestructive Testing (CNDT) Laboratory, it has different nondestructive testing methods for quality shearography is one of the optical technique that. Overview. Laser shearography is an optical measurement technique.   The shearography camera is a common path interferometer and images the first derivative of the out-of-plane deformation of the test part surface in response to a change in load. When a shearography camera is used to image an aircraft honeycomb panel, a wide range of defects may be seen including disbonds, damage to the core and impact damage.

    The recent rapid development of rotation rate sensor technology opens new opportunities for their application in more and more fields. In this paper, the potential of rotational sensors for the modal analysis of full-scale civil engineering structural elements is experimentally examined. For this purpose, vibrations of two 6-m long beams made of ultra-high performance concrete (UHPC) were. Digital Shearography 作者: Wolfgang Steinchen / Lianxiang Yang 出版社: SPIE Publications 副标题: Theory and Application of Digital Speckle Pattern Shearing Interferometry 出版年: 页数: 定价: USD 装帧: Hardcover ISBN:

    Books about digital photography for the photo enthusiast that inspire, inform, and help you capture beautiful photographs. Score A book’s total score is based on multiple factors, including the number of people who have voted for it and how highly those voters ranked the book. This paper introduces a digital shearography system which utilizes the spatial phase-shift technique to obtain an extremely high acquisition rate. The newly developed spatial phase-shift shearography system uses a Michelson-Interferometer as the shearing device. A high power laser at nm wavelength is used as the light source.


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Digital shearography by Wolfgang Steinchen Download PDF EPUB FB2

This book describes the development of second-generation digital shearography, which is especially effective in nondestructive testing, strain measurement, and vibration analysis due to its relative insensitivity to environmental disturbances.

Contents - Introduction and approach to problem - Shearographic metrology - Simple digital shearography. That book has greatly contributed to Digital shearography book better understanding and improvement of the digital shearography technique.

During the past 13 years, digital shearography has been widely applied by industry and accepted as a practical tool for nondestructive testing; at the same time, the technique itself has been greatly by: Shearography is an optical interferometric technique that is finding increasing application for composite inspection [32,33].

Figure shows a schematic of the shearography process. Coherent laser light is scattered from the test surface and passed through a shearing optic that splits the scene into two identical but displaced images before the image is focused on the detector.

This book describes the development of second-generation digital shearography, which is especially effective in nondestructive testing, strain measurement, and vibration analysis due to its relative insensitivity to environmental disturbances.

Shearography or Speckle pattern shearing interferometry is a measuring and testing method similar to holographic uses coherent light or coherent soundwaves to provide information about the quality of different materials in nondestructive testing, strain measurement, and vibration analysis.

Shearography is extensively used in production and development in aerospace, wind rotor. It has been more than a decade since SPIE Press published the first book on shearography in Digital Shearography: Theory and Application of Digital Speckle Pattern Shearing Interferometry by Wolfgang Steinchen and Lianxiang book has greatly contributed to enabling better understanding and improvement of the digital shearography technique.

With digital shearography, the flaws are revealed in one second, whilst the ultrasonic technique requires point-by-point scanning Digital shearography book the test surface and, at the same time, proper fluid coupling between the transducer and the test surface must be ensured (Choi et al., ).

Note that the ultrasound image is of low quality, as the result was. Shearography, also called speckle pattern shearing interferometry, is a measurement technique based on laser speckle pattern interferometry.

It measures the gradient of the deformation. In order to provide a better understanding of the digital shearography technique, this chapter gives a brief review of basic optics principles by reviewing the. This book is, however, not intended as a commemoration, rather as an occasion to review the trends and undercurrents that are driving the field of optical metrology, with emphasis on nondestructive testing.

Digital Shearography and Applications (Y.Y. Hung). Principles of digital shearography. Applications. Limitations and remedies.

Measurement Principles of Digital Shearography: Digital shearography is a laser measuring technique based on digital data processing, phase-shifting techniques and interferometry. According to the common sense of interferometry, two beams with an identical wavelength are required for a. The book presents recent developments of phase shift-digital shearography and its applicatis with focus on spatial phase shift-digital shearography, pages and more than figures.

Nondestructive Evaluation (NDE) of Composites: Digital Shearography - (a book chapter with 32 pages: pp. 84 - ). 10+ Free eBooks for Digital Photography.

Stephanie Kay-Kok. Because most photography gear is so expensive, it’s a relief when you can get nice stuff for free. One nice thing you can always get for free is knowledge. While you can certainly pay for a memorable photography workshop, there are plenty of tips and resources online.

Digital shearography, a laser interferometric technique in conjunction with the digital image processing, has the potential for vibration analysis due to its simple optical system and sensitivity against small rigid body motions.

This paper will focus on its recent developments for vibration analysis and for nondestructive testing (NDT) by dynamic (harmonic) excitation.

Book April Digital shearography can directly measure strain with high sensitivity when combined with different optical setups, phase-shift techniques, and algorithms. Its simple setup. For exploring these motivations, it is important to develop didactic tools to understand the potential of digital shearography through training and didactic courses in the field of NDT.

In this paper we describe a simple tool for making one familiar with the. Abstract. Digital Shearography is an optical non-contacting non- destructive testing technique. The inspection method has found many applications and is particularly suited for amongst others, in-situ inspection of composite components for defects such as low velocity impact damage and delaminations.

Three versions of shearography are in existence which are based on different recording media: photographic[1]; thermoplastic[2]; and digital[3].

Recently, a unified approach for practising holography and shearography was reported[4]. In this paper, only the digital version of shearography is presented.

Book: Lian X. Yang and Xin Xie, “Digital Shearography: New Developments and Applications”, ISBN:published in by SPIE Press, Bellingham, WA, USA Book: Wolfgang Steinchen and Lian X. Yang, “Digital Shearography: Theroy and Application of Digital Speckle Pattern Shearing Interferometry” ISBN Books & Publications Patents Teaching Laboratories Links: Patents in Germany, USA and Canada.

US Patent Application: (January ), "3D Digital Image Correlation Using Single Color Camera Pseudo-Stereo System," L.X.

Yang, J.R. Li, G. Yang, and W. Digital shearography, also called TV-shearography, is a further technical development of shearography. The experimental setup ofdigital shearography is shown below on the right side.

It is the technique using laser speckle as the carrier ofthe displacement information, recording the. optics means that development of simple digital shearography. systems is now easier than ever before and more comple x. systems covering a wider range of measurement applications.Genre/Form: Electronic books: Additional Physical Format: Print version: Yang, Lianxiang.

Digital Shearography: New Developments and Applications. Bellingham: Society of Photo-Optical Instrumentation Engineers (SPIE), ©  Digital speckle shearography (DSS) is a noncontact, full-field optical interferometric technique for the high sensitivity measurement of displacement derivatives at an object's surface.

It uses charge-coupled device (CCD) sensors as a recording medium and digital processing technology to acquire image data and analyse the results [17–22].