TV-Holography and holographic interferometry: Industrial applications

Steinbichler, H.; Gehring, G.

doi:10.1016/0143-8166(95)00025-9

Cited by 19 publications

(7 citation statements)

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“…Incorporation of digital techniques in holography led to the development of TV holography for almost realtime recording using video camera and numerical reconstruction of holograms [50]. This was an extension of the speckle interferometry [42] and thus is also known as 'electronic speckle pattern interferometry (ESPI).'…”

Section: Interferometric Applications Of Digital Holography 71 Princi...mentioning

confidence: 99%

“…HI precisely measure micro and nanometer displacements [27][28][29][30], vibrations [31,32], refractive index and phase [33,34] and thus find applications in a wide range of processes. Hence, holographic interferometric techniques have been widely used for study and NDT applications including testing and quality control of industrial and scientific products [4,[22][23][24][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54], space and avionic components [42][43][44][45], automotive components [45,46], machine tools [47,48] etc.…”

Section: Introductionmentioning

confidence: 99%

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Emerging scientific and industrial applications of digital holography: an overview

Kumar,

Dwivedi

2023

Eng. Res. Express

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Holography is a technique to record and reconstruct three dimensional (3D) information without mandating lenses. Digital holography (DH) provides direct access to the complex amplitude of the reconstructed wavefront. This feature differentiates DH from other imaging techniques and enables it to provide quantitative information of the object under investigation. Advancements in technologies of digital image sensors, coherent sources, and computation algorithms and hardware, has paved the way of digital holographic systems for industrial applications. This work presents an overview of the scientific and industrial applications where DH can play an important role. Few of the applications of digital holographic systems in the industrial and scientific areas including microscopy, non-destructive testing, displays, environment, cloud and ocean studies are discussed.

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Section: Interferometric Applications Of Digital Holography 71 Princi...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Emerging scientific and industrial applications of digital holography: an overview

Kumar,

Dwivedi

2023

Eng. Res. Express

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“…Industrial applications of HI and other interferometric techniques are reported in e.g. [BH00,SG96].…”

Section: (Pulse) Espi In Applicationmentioning

confidence: 99%

Electronic speckle pattern interferometry

Cloud¹

1995

Optical Methods of Engineering Analysis

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Nondestructive Testing of various kinds is one of the cornerstones in Structural-Health-Monitoring concepts, maintenance plans, and quality management. Increasing automation and speed of production processes is motivating research on appropriately instrumented Nondestructive Testing methods that also show potential for automation. Furthermore, an increasing use of advanced engineering materials and the simultaneously occurring challenges in detection and assessment of damage is motivating research into suitable additional and complementary inspection methods. Commercial off-the-shelf measurement systems, which can be easily adapted to a specific task, are of special interest in industry. This research work investigates the feasibility and applicability of visual defect detection with a commercial double-pulse Electronic Speckle Pattern Interferometry (ESPI) system, based on impact-excited elastic waves, on methods with forced vibrations, and on methods with thermoelastic deformations. In the case of forced vibrations, methods are adopted that show an increased potential of defect-selectivity. Elements of civil infrastructure (made of reinforced concrete-a slab track segment, block sleepers, sleepers) are investigated for defects with respect to instrumented NDT in quality management. The traditional single-exciter "mode studies" method in use with doublepulse ESPI is extended with multi-exciter methods adapted from vibration testing. The potential of successful application can be concluded for all of the applied excitation methods. Samples of advanced engineering materials (CFRP laminates, composite honeycomb) are investigated for artificial defects with elastic-wave and vibration-based methods and with thermoelastic deformations. The traditional "mode studies" method is complemented with "chirp" and band-limited "narrow noise" excitation. The potential of successful application and increased defect-selectivity can be demonstrated for the vibration methods. Further advance in elastic-wave and thermoelastic-deformation-based defect detection in CFRP laminates will become possible by gaining skill and experience in defect-pattern recognition. A full-scale skin-stringer structure (an elevator flap of a Breguet 1150 aircraft) is tested with elastic waves and forced vibrations. First insights are gained into the "full-field" appearance of related phenomena. This complements on the one hand the analysis of such structures to date and, on the other hand, points out the challenges confronting visual defect detection. In all cases under consideration, the encouraging results obtained justify continuing research and proposals for future work are put forward. THIS PAGE INTENTIONALLY LEFT BLANK List of Acronyms and Abbreviations xix * Symbols/quantities in common use, auxiliary variables. † Dimensions, geometric quantities. ‡ Complex and phasor notation. § Propagation of light and speckle interferometry. Continuum mechanics and elastic waves. # Wave propagation in periodic structures. * "live", † double/multi pulsed, ‡ strob...

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“…With a measurement accuracy in sub-micrometer range this methods have already been applied in many fields of industry [1] as well as for biomedical applications [2]. Furthermore, by utilization of modern CCD sensor technology and fast digital image processing an on-line application of these methods even in vivo [3] is possible.…”

Section: Introductionmentioning

confidence: 97%

Holographic interferometric microscopy systems for the application on biological samples

Kemper

Carl

Knoche

et al. 2004

Optical Metrology in Production Engineering

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Holographic interferometric metrology allows a fast, non destructive and quantitative high resolution full field detection of optical path length changes. Furthermore, by utilization of modern CCD sensor technology and digital image processing algorithms an on-line application of these methods even on biological specimens is possible. In combination with a microscopic resolution this offers new possibilities for the detection of variations of shape, micro movements or refractive index changes e. g. for the marker free analysis of cellular samples. Three holographic interferometric systems for microscopy applications based on digital holography, (speckle) interferometry and photorefractive crystals as holographic recording medium are introduced. Results of investigations on test charts and biological samples to characterize and optimize the lateral resolution as well as the resolution of the detected phase difference changes are presented and discussed. Finally, the applicability of the developed measurement techniques on living cells is demonstrated. INTRODUCTIONHolographic and speckle interferometry are well-established and frequently applied tools for non destructive testing (NDT) and the analysis of displacements, movements and vibrations. With a measurement accuracy in sub-micrometer range this methods have already been applied in many fields of industry [1] as well as for biomedical applications [2]. Furthermore, by utilization of modern CCD sensor technology and fast digital image processing an on-line application of these methods even in vivo [3] is possible. Holographic interferometric metrology allows a fast, non-contact and quantitative high resolution full field detection of optical path length changes. This offers in combination with a microscopic resolution new possibilities for the analysis of cellular tissues and cells. In the upcoming fields of life sciences and biophotonics there is a requirement for an optical instrumentation of timely and spatially high resolution analysis, measurement and documentation in microscopic dimensions. Here, applications are of particular interest to get enhanced information about cellular tissues and single cells e. g. the detection of shape variations and refractive index changes as well as the full field analysis of parameters like micro movements or the local distribution of elasticity. Up to the present, such parameters are in general not considered in cellular and sub cellular dimensions although they are already routinely used e. g. for defect detection and tumor diagnostics in the macroscopic scale. In that view, holographic interferometric microscopy tools open up new facilities for a marker free monitoring of life processes and cell manipulation as well as for an automated cell differentiation and feedback systems for growing processes in tissue engineering.For such applications of holographic interferometric metrology, the specific requirements for the analysis of cellular tissues and living cells have to be considered and a lateral resolution in microscop...

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TV-Holography and holographic interferometry: Industrial applications

Cited by 19 publications

References 0 publications

Emerging scientific and industrial applications of digital holography: an overview

Emerging scientific and industrial applications of digital holography: an overview

Electronic speckle pattern interferometry

Holographic interferometric microscopy systems for the application on biological samples

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