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Khodadad, Davood
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Khodadad, D. (2019). Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement. International Journal of Optics, 2019, Article ID 4906109.
Öppna denna publikation i ny flik eller fönster >>Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement
2019 (Engelska)Ingår i: International Journal of Optics, ISSN 1687-9384, E-ISSN 1687-9392, Vol. 2019, artikel-id 4906109Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We present a digital holographic method to increase height range measurement with a reduced phase ambiguity using a dual-directional illumination. Small changes in the angle of incident illumination introduce phase differences between the recorded complex fields. We decrease relative phase difference between the recorded complex fields 279 and 139 times by changing the angle of incident 0.5° and 1°, respectively. A two cent Euro coin edge groove is used to measure the shape. The groove depth is measured as ≈300 μm  . Further, numerical refocusing and analysis of speckle displacements in two different planes are used to measure the depth without a use of phase unwrapping process.

Ort, förlag, år, upplaga, sidor
Hindawi Publishing Corporation, 2019
Nationell ämneskategori
Teknisk mekanik
Forskningsämne
Experimentell mekanik
Identifikatorer
urn:nbn:se:ltu:diva-72956 (URN)10.1155/2019/4906109 (DOI)000459030200001 ()2-s2.0-85062368196 (Scopus ID)
Anmärkning

Validerad;2019;Nivå 2;2019-03-13 (johcin)

Tillgänglig från: 2019-02-20 Skapad: 2019-02-20 Senast uppdaterad: 2019-03-13Bibliografiskt granskad
Khodadad, D. & Tayebi, B. (2018). Shape Measurement Based on Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements. In: : . Paper presented at 2018 Progress In Electromagnetics Research Symposium, PIERS-Toyama 2018; Toyama; Japan; 1-4 August 2018.
Öppna denna publikation i ny flik eller fönster >>Shape Measurement Based on Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements
2018 (Engelska)Konferensbidrag (Refereegranskat)
Identifikatorer
urn:nbn:se:ltu:diva-72847 (URN)10.23919/PIERS.2018.8597821 (DOI)000458673700026 ()
Konferens
2018 Progress In Electromagnetics Research Symposium, PIERS-Toyama 2018; Toyama; Japan; 1-4 August 2018
Tillgänglig från: 2019-02-11 Skapad: 2019-02-11 Senast uppdaterad: 2019-03-14
Khodadad, D., Singh, A. K., Pedrini, G. & Sjödahl, M. (2016). Full-field 3D deformation measurement: Comparison between speckle phase and displacement evaluation. Applied Optics, 55(27), 7735-7743
Öppna denna publikation i ny flik eller fönster >>Full-field 3D deformation measurement: Comparison between speckle phase and displacement evaluation
2016 (Engelska)Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 55, nr 27, s. 7735-7743Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The objective of this paper is to describe a full-field deformation measurement method based on 3D speckle displacements. The deformation is evaluated from the slope of the speckle displacement function that connects the different reconstruction planes. For our experiment, a symmetrical arrangement with four illuminations parallel to the planes (x,z) and (y,z) was used. Four sets of speckle patterns were sequentially recorded by illuminating an object from the four directions, respectively. A single camera is used to record the holograms before and after deformations. Digital speckle photography is then used to calculate relative speckle displacements in each direction between two numerically propagated planes. The 3D speckle displacements vector is calculated as a combination of the speckle displacements from the holograms recorded in each illumination direction. Using the speckle displacements, problems associated with rigid body movements and phase wrapping are avoided. In our experiment, the procedure is shown to give the theoretical accuracy of 0.17 pixels yielding the accuracy of 2 × 10-3 in the measurement of deformation gradients

Nationell ämneskategori
Strömningsmekanik och akustik
Forskningsämne
Strömningslära
Identifikatorer
urn:nbn:se:ltu:diva-59937 (URN)10.1364/AO.55.007735 (DOI)000383996900038 ()2-s2.0-8498881167 (Scopus ID)
Anmärkning

Validerad; 2016; Nivå 2; 2016-10-25 (andbra)

Tillgänglig från: 2016-10-25 Skapad: 2016-10-25 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Khodadad, D. (2016). Multiplexed Digital Holography incorporating Speckle Correlation (ed.). (Doctoral dissertation). Paper presented at . : Luleå tekniska universitet
Öppna denna publikation i ny flik eller fönster >>Multiplexed Digital Holography incorporating Speckle Correlation
2016 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In manufacturing industry there is a high demand for on line quality control to minimize the risk of incorrectly produced objects. Conventional contact measurement methods are usually slow and invasive, meaning that they cannot be used for soft materials and for complex shapes without influencing the controlled parts. In contrast, interferometry and digital holography in combination with computers become faster, more reliable and highly accurateas an alternative non-contact technique for industrial shape evaluation. For example in digital holography, access to the complex wave field and the possibility to numerically reconstruct holograms in different planes introduce a new degree of flexibility to optical metrology. With digital holography high resolution and precise three dimensional (3D) images of the manufactured parts can be generated. This technique can also be used to capture data in asingle exposure, which is important when doing measurements in a disturbed environment. The aim of this thesis is devoted to the theoretical and experimental development of shape and deformation measurements. To perform online process control of free-form manufactured objects, the measured shape is compared with the CAD-model to obtain deviations. To do this, a new technique to measure surface gradients and shape based onsingle-shot multiplexed dual-wavelength digital holography and image correlation of speckle displacements is demonstrated. Based on an analytical relation between phase gradients and speckle displacements it is shown that an object is retrieved uniquely to shape, position and deformation without the unwrapping problems that usually appear in dual-wavelength holography. The method is first demonstrated using continues-wave laser light from twotemperature controlled laser diodes operating at 640 nm. Then a specially designed dual core diode pumped fiber laser that produces pulsed light with wavelengths close to 1030 nm is used. In addition, a Nd:YAG laser with the wavelength of 532 nm is used for 3D deformation measurements. One significant problem when using the dual-wavelength single-shot approach is that phase ambiguities are built in to the system that needs to be corrected. An automatic calibration scheme is therefore required. The intrinsic flexibility of digital holography gives a possibility to compensate these aberrations and to remove errors, fully numerically without mechanical movements. In this thesis I present a calibration method which allows multiplexed singleshotonline shape evaluation in a disturbed environment. It is shown that phase maps and speckle displacements can be recovered free of chromatic aberrations. This is the first time that a multiplexed single-shot dual-wavelength calibration is reported by defining a criteria tomake an automatic procedure. Further, Digital Speckle Photography (DSP) is used for the full field measurement of 3D deformations. In order to do 3D deformation measurement, usually multi-cameras and intricate set-up are required. In this thesis I demonstrate the use of only one single camera torecord four sets of speckle patterns recorded by illuminating the object from four different directions. In this manner, meanwhile 3D speckle displacement is calculated and used for the measurement of the 3D deformations, wrapping problems are also avoided. Further, the same scale of speckle images of the surface for all four images is guaranteed. Furthermore, a need for calibration of the 3D deformation measurement that occurs in the multi-camera methods,is removed. By the results of the presented work, it is experimentally verified that the multiplexed singleshot dual wavelength digital holography and numerically generated speckle images can be used together with digital speckle correlation to retrieve and evaluate the object shape. Usingmultidirectional illumination, the 3D deformation measurements can also be obtained. The proposed method is robust to large phase gradients and large movements within the intensity patterns. The advantage of the approach is that, using speckle displacements, shape and deformation measurements can be performed even though the synthetic wavelength is out of the dynamic range of the object deformation and/or height variation.

Ort, förlag, år, upplaga, sidor
Luleå tekniska universitet, 2016
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Nationell ämneskategori
Teknisk mekanik
Forskningsämne
Experimentell mekanik
Identifikatorer
urn:nbn:se:ltu:diva-26496 (URN)e874d6de-432c-4135-b7d0-a6c92417d677 (Lokalt ID)978-91-7583-517-4 (ISBN)978-91-7583-518-1 (ISBN)e874d6de-432c-4135-b7d0-a6c92417d677 (Arkivnummer)e874d6de-432c-4135-b7d0-a6c92417d677 (OAI)
Anmärkning
Godkänd; 2016; 20160126 (davkho); Nedanstående person kommer att disputera för avläggande av teknologie doktorsexamen. Namn: Davood Khodadad Ämne: Experimentell mekanik /Experimental Mechanics Avhandling: Multiplexed Digital Holography Incorporating Speckle Correlation Opponent: Professor Pascal Picart, ENSIM-École Nationale Supérieure d’Ingénieurs du Mans, LeMans, Frankrike. Ordförande: Professor Mikael Sjödahl, Avd för strömningslära och experimentell mekanik, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet, Luleå. Tid: Torsdag 25 februari, 2016 kl 10.00 Plats: E231, Luleå tekniska universitetTillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2017-11-24Bibliografiskt granskad
Tjörhammar, S., Eklöf, F. K., Yu, Z., Khodadad, D., Hällstig, E., Sjödahl, M. & Laurell, F. (2016). Multiwavelength laser designed for single-frame digital holography. Applied Optics, 55(27), 7517-7521
Öppna denna publikation i ny flik eller fönster >>Multiwavelength laser designed for single-frame digital holography
Visa övriga...
2016 (Engelska)Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 55, nr 27, s. 7517-7521Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this paper, we present a tailored multiwavelength Yb-fiber laser source in the 1.03 μm spectral region for spatially multiplexed digital holographic acquisitions. The wavelengths with bandwidths below 0.1 nm were spectrally separated by approximately 1 nm by employing fiber Bragg gratings for spectral control. As a proof of concept, the shape of a cylindrically shaped object with a diameter of 48 mm was measured. The holographic acquisition was performed in single-shot dual-wavelength mode with a synthetic wavelength of 1.1 mm, and the accuracy was estimated to be 3% of the synthetic wavelength.

Nationell ämneskategori
Teknisk mekanik
Forskningsämne
Experimentell mekanik
Identifikatorer
urn:nbn:se:ltu:diva-59960 (URN)10.1364/AO.55.007517 (DOI)000383996900010 ()2-s2.0-84988841942 (Scopus ID)
Anmärkning

Validerad; 2016; Nivå 2; 2016-10-26 (andbra)

Tillgänglig från: 2016-10-26 Skapad: 2016-10-26 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Khodadad, D. (2016). Phase-derivative-based estimation of digital reference wave from single off-axis digital hologram (ed.). Paper presented at . Applied Optics, 55(7), 1663-1669
Öppna denna publikation i ny flik eller fönster >>Phase-derivative-based estimation of digital reference wave from single off-axis digital hologram
2016 (Engelska)Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 55, nr 7, s. 1663-1669Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This paper describes a method to obtain an estimated digital reference wave from a single off-axis digital hologram that matches the actual experimental reference wave as closely as possible. The proposed method is independent of a reference flat plate and speckles. The digital reference wave parameters are estimated directly from the recorded phase information. The parameters include both the off-axis tilt angle and the curvature of the reference wave. Phase derivatives are used to extract the digital reference wave parameters without the need for a phase unwrapping process. Thus, problems associated with phase wrapping are avoided. Experimental results for the proposed method are provided. The simulated effect of the digital reference wave parameters on the reconstructed image phase distribution is shown. The pseudo phase gradient originating from incorrect estimation of the digital reference wave parameters and its effect on object reconstruction are discussed.

Nationell ämneskategori
Teknisk mekanik
Forskningsämne
Experimentell mekanik
Identifikatorer
urn:nbn:se:ltu:diva-8952 (URN)10.1364/AO.55.001663 (DOI)000371297000023 ()2-s2.0-84962194635 (Scopus ID)7822b113-b7ce-460f-a72c-51977af493a9 (Lokalt ID)7822b113-b7ce-460f-a72c-51977af493a9 (Arkivnummer)7822b113-b7ce-460f-a72c-51977af493a9 (OAI)
Anmärkning
Validerad; 2016; Nivå 2; 20160204 (davkho)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Khodadad, D., Bergström, P., Hällstig, E. & Sjödahl, M. (2015). Fast and robust automatic calibration for single-shot dual-wavelength digital holography based on speckle displacements (ed.). Paper presented at . Applied Optics, 54(16), 5003-5010
Öppna denna publikation i ny flik eller fönster >>Fast and robust automatic calibration for single-shot dual-wavelength digital holography based on speckle displacements
2015 (Engelska)Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 54, nr 16, s. 5003-5010Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The objective of this paper is to describe a fast and robust automatic single-shot dual-wavelength holographic calibration method that can be used for online shape measurement applications. We present a model of the correction in two terms for each lobe, one to compensate the systematic errors caused by off-axis angles and the other for the curvature of the reference waves, respectively. Each hologram is calibrated independently without a need for an iterative procedure or information of the experimental set-up. The calibration parameters are extracted directly from speckle displacements between different reconstruction planes. The parameters can be defined as any fraction of a pixel to avoid the effect of quantization. Using the speckle displacements, problems associated with phase wrapping is avoided. The procedure is shown to give a shape accuracy of 34 μm using a synthetic wavelength of 1.1 mm for a measurement on a cylindrical test object with a trace over a field of view of 18  mm×18  mm.

Nyckelord
digital holography, Speckle imaging, Interferometry, metrology, calibration, surface measurement, multiplexing, single shot, Technology - Engineering physics, Teknikvetenskap - Teknisk fysik
Nationell ämneskategori
Teknisk mekanik Beräkningsmatematik
Forskningsämne
Experimentell mekanik; Teknisk-vetenskapliga beräkningar
Identifikatorer
urn:nbn:se:ltu:diva-10347 (URN)10.1364/AO.54.005003 (DOI)000355555700009 ()2-s2.0-84942372341 (Scopus ID)924b8540-da35-4fa3-90a0-89f1ac2a9d3d (Lokalt ID)924b8540-da35-4fa3-90a0-89f1ac2a9d3d (Arkivnummer)924b8540-da35-4fa3-90a0-89f1ac2a9d3d (OAI)
Anmärkning
Validerad; 2015; Nivå 2; 20150522 (davkho)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Khodadad, D., Amer, E., Gren, P., Melander, E., Hällstig, E. & Sjödahl, M. (2015). Single-shot dual-polarization holography: measurement of the polarization state of a magnetic sample (ed.). In: (Ed.), Fernando Mendoza Santoyo; Eugenio R. Mendez (Ed.), SPECKLE 2015: VI International Conference on Speckle Metrology. : SPIE - International Society for Optical Engineering
Öppna denna publikation i ny flik eller fönster >>Single-shot dual-polarization holography: measurement of the polarization state of a magnetic sample
Visa övriga...
2015 (Engelska)Ingår i: SPECKLE 2015: VI International Conference on Speckle Metrology / [ed] Fernando Mendoza Santoyo; Eugenio R. Mendez, SPIE - International Society for Optical Engineering, 2015Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

In this paper a single-shot digital holographic set-up with two orthogonally polarized reference beams is proposed to achieve rapid acquisition of Magneto-Optical Kerr Effect images. Principles of the method and the background theory for dynamic state of polarization measurement by use of digital holography are presented. This system has no mechanically moving elements or active elements for polarization control and modulation. An object beam is combined with two reference beams at different off-axis angles and is guided to a detector. Then two complex fields (interference terms) representing two orthogonal polarizations are recorded in a single frame simultaneously. Thereafter the complex fields are numerically reconstructed and carrier frequency calibration is done to remove aberrations introduced in multiplexed digital holographic recordings. From the numerical values of amplitude and phase, a real time quantitative analysis of the polarization state is possible by use of Jones vectors. The technique is demonstrated on a magnetic sample that is a lithographically patterned magnetic microstructure consisting of thin permalloy parallel stripes

Ort, förlag, år, upplaga, sidor
SPIE - International Society for Optical Engineering, 2015
Serie
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 9660
Nyckelord
Single-shot acquisition, holography, dual-polarization, Magneto-Optical Kerr Effect, polarization, measurement, multiplexed holography, Technology - Electrical engineering, electronics and photonics, Teknikvetenskap - Elektroteknik, elektronik och fotonik
Nationell ämneskategori
Teknisk mekanik
Forskningsämne
Experimentell mekanik
Identifikatorer
urn:nbn:se:ltu:diva-34046 (URN)10.1117/12.2189782 (DOI)000360300500036 ()2-s2.0-84943551779 (Scopus ID)82680dae-42a6-4c75-92d6-621694a624d6 (Lokalt ID)9781628418781 (ISBN)82680dae-42a6-4c75-92d6-621694a624d6 (Arkivnummer)82680dae-42a6-4c75-92d6-621694a624d6 (OAI)
Anmärkning
Validerad; 2015; Nivå 1; 20150829 (davkho)Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Khodadad, D. (2014). Combined Digital Holography and Speckle Correlation for Rapid Shape Evaluation (ed.). (Licentiate dissertation). Paper presented at . : Luleå tekniska universitet
Öppna denna publikation i ny flik eller fönster >>Combined Digital Holography and Speckle Correlation for Rapid Shape Evaluation
2014 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In manufacturing industry there is a high demand for on line quality control to minimize the risk of incorrectly produced objects. Conventional contact measurement methods are usually slow and invasive, meaning that they cannot be used for soft materials and for complex shapes without influencing thecontrolled parts. In contrast, interferometry and digital holography in combination with computers become faster, more reliable and highly accurate as an alternative non-contact technique for industrial shape evaluation. In digital holography, access to the complex wave field and the possibility tonumerically reconstruct holograms in different planes introduce a new degree of flexibility to optical metrology. With digital holography high resolution and precise three dimensional (3D) images of the manufactured parts can be generated. This technique can also be used to capture data in a single exposure,which is important when doing measurements in a disturbed environment.The aim of this thesis is to perform online process control of free-form manufactured objects by measuring the shape and compare it to the CAD-model. To do this, a new technique to measure surface gradients and shape based on single-shot dual wavelength digital holography and image correlation of speckle displacements is demonstrated. Based on an analytical relation between phase gradients and speckle displacements it is shown that an object is retrieved uniquely to shape and position without the unwrapping problems that usually appear in dual wavelength holography. The method is firstdemonstrated using continues wave laser light from two temperature controlled laser diodes operating at 640 nm. Further a specially designed dual core diode pumped fiber laser that produces pulsed light with wavelengths close to 1030 nm is used. One significant problem when using the dual wavelength single-shot approach is that phase ambiguities are built in to the system that needs to be corrected. An automatic calibration scheme is therefore required. The intrinsic flexibility of digital holography gives a possibility to compensate these aberrations and to remove errors, fully numerically without mechanical movements. In this thesis I present a calibration method which allows single-shot online shape evaluation in a disturbed environment. It is shown that phase maps and speckle displacements can be recovered free of chromatic aberrations. This is the first time that a single-shot dual wavelength calibration is reported by defining a criteria to make an automatic procedure.By the results of the presented work, it is experimentally verified that the single-shot dual wavelength digital holography and numerically generated speckle images can be used together with digital speckle correlation to retrieve and evaluate the object shape. The proposed method is also robust to large phasegradients and large movements within the intensity patterns. The advantage of the approach is that, using speckle displacements, the shape measurement can be done even though the synthetic wavelength is out of the dynamic range of the height variation of the object.

Ort, förlag, år, upplaga, sidor
Luleå tekniska universitet, 2014
Serie
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Nationell ämneskategori
Teknisk mekanik
Forskningsämne
Experimentell mekanik
Identifikatorer
urn:nbn:se:ltu:diva-26355 (URN)de077eb5-becf-48b0-a396-12dc1594bf00 (Lokalt ID)978-91-7439-960-8 (ISBN)978-91-7439-961-5 (ISBN)de077eb5-becf-48b0-a396-12dc1594bf00 (Arkivnummer)de077eb5-becf-48b0-a396-12dc1594bf00 (OAI)
Anmärkning
Godkänd; 2014; 20140516 (davkho); Nedanstående person kommer att hålla licentiatseminarium för avläggande av teknologie licentiatexamen. Namn: Davood Khodadad Ämne: Experimentell mekanik/Experimental Mechanics Uppsats: Combined Digital Holography and Speckle Correlation for Rapid Shape Evaluation Examinator: Professor Mikael Sjödahl, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet Diskutant: Teknisk doktor Anna Runnemalm, Institutionen för ingenjörsvetenskap, Högskolan Väst, Trollhättan Tid: Fredag den 13 juni 2014 kl 15.00 Plats: E243, Luleå tekniska universitetTillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2017-11-24Bibliografiskt granskad
Khodadad, D., Bergström, P., Hällstig, E. & Sjödahl, M. (2014). Dual-wavelength digital holography: single shot calibration (ed.). In: (Ed.), (Ed.), Interferometry XVII: Techniques and Analysis. Paper presented at Interferometry XVII : Techniques and Analysis 17/08/2014 - 21/08/2014. Bellingham, Wash: SPIE - International Society for Optical Engineering, Article ID 920305.
Öppna denna publikation i ny flik eller fönster >>Dual-wavelength digital holography: single shot calibration
2014 (Engelska)Ingår i: Interferometry XVII: Techniques and Analysis, Bellingham, Wash: SPIE - International Society for Optical Engineering, 2014, artikel-id 920305Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

In an on line shape measurement in disturbed environment, use of many wavelengths in order to avoid phase ambiguity may become a problem as it is necessary to acquire all holograms simultaneously due to environmental disturbances. Therefore to make the shape data available the different holograms have to be extracted from a single recorded image in spectral domain. Appropriate cut areas in the Fourier method are therefore of great importance for decoding information carried by different wavelengths. Furthermore using different laser sources, induces aberration and pseudo phase changes which must be compensated. To insure any phase change is only because of the object shape, calibration is therefore indispensable. For this purpose, effects of uncontrolled carrier frequency filtering are discussed. A registration procedure is applied using minimum speckle displacements to find the best cut area to extract and match the interference terms. Both holograms are numerically propagated to a focus plane to avoid any unknown errors. Deviations between a reference known plate and its measurement are found and used for calibration. We demonstrate that phase maps and speckle displacements can be recovered free of chromatic aberrations. To our knowledge, this is the first time that a single shot dual wavelength calibration is reported by defining a criteria to make the spatial filtering automatic avoiding the problems of manual methods. The procedure is shown to give shape accuracy of 35μm with negligible systematic errors using a synthetic wavelength of 1.1 mm.

Ort, förlag, år, upplaga, sidor
Bellingham, Wash: SPIE - International Society for Optical Engineering, 2014
Serie
Proceedings of S P I E - International Society for Optical Engineering, ISSN 0277-786X ; 9203
Nyckelord
digital holography, dual-wavelength, single shot, calibration, speckle displacements, on line shape measurement, image correlation, Technology - Engineering physics, Teknikvetenskap - Teknisk fysik
Nationell ämneskategori
Teknisk mekanik Beräkningsmatematik
Forskningsämne
Experimentell mekanik; Teknisk-vetenskapliga beräkningar
Identifikatorer
urn:nbn:se:ltu:diva-39188 (URN)10.1117/12.2062101 (DOI)000354364200005 ()2-s2.0-84922880623 (Scopus ID)dd50de19-cde8-41f8-bbb9-c54962ee2580 (Lokalt ID)9781628412314 (ISBN)dd50de19-cde8-41f8-bbb9-c54962ee2580 (Arkivnummer)dd50de19-cde8-41f8-bbb9-c54962ee2580 (OAI)
Konferens
Interferometry XVII : Techniques and Analysis 17/08/2014 - 21/08/2014
Anmärkning
Godkänd; 2014; 20140827 (davkho)Tillgänglig från: 2016-10-03 Skapad: 2016-10-03 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
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