Skip to main content

Hans Bjelkhagen

Followers

257

Following

50

Co-authors

8

Mentions

1

Public Views

Dr Hans I Bjelkhagen, Professor at the Ultra-realistic Imaging Centre, Glyndŵr Univ., located in North Wales, UK. He was awarded his Doctoral Degree in 1978 by the Royal Institute of Technology in Stockholm, Sweden. Previously Bjelkhagen has worked on holographic applications at CERN in Geneva, Switzerland, at Fermilab in Batavia, IL and Northwestern Univ, IL, USA, at De Montfort Univ., Leicester, UK The most famous person recorded by Bjelkhagen in a hologram was President Ronald Reagan, recorded 1991. Bjelkhagen has published over 100 papers and two books: Silver-Halide Recording Materials for Holography and Their Processing, by Springer 1983/1985 and Ultra-Realistic Imaging, Advanced Techniques in Analogue and Digital Colour Holography, by CRC Press, 2013. Bjelkhagen is a member of OSA and a Fellow of the SPIE. In 2001 he received the RPS SAXBY AWARD and in 2011 the DENISYUK MEDAL, from the D.S. Rozhdestvensky Optical Society, Russia.
Address: www.hansholo.com

less

Interests

Uploads

Conference Presentations by Hans Bjelkhagen

ULTRA-REALISTIC IMAGING AND OPTOCLONES TM

by Andreas Sarakinos, Hans Bjelkhagen, and Alkis Lembessis

Recent improvements in solid state CW lasers, recording materials and light sources (such as LED ... more Recent improvements in solid state CW lasers, recording materials and light sources (such as LED lights) for displaying color holograms are described. Full-color analogue holograms can now be created with substantially better image characteristics than previously possible. To record ultra-realistic images depends on selecting the optimal recording laser wavelengths and employing ultra-fine-grain, silver-halide materials. The image quality is improved by using LED display light with improved spatial coherence. Recording museum artifacts using mobile holographic equipment is described. The most recent recorded such holograms (referred to as OptoClonesTM) are the Fabergé Eggs at the Fabergé Museum in St. Petersburg, Russia.

The True Colour of Photography

uk " We, the progeny of James Clerk Maxwell are beginning to recognize the need to return to the ... more uk " We, the progeny of James Clerk Maxwell are beginning to recognize the need to return to the genius of Newton, to resurrect the startling beauty of Lippmann and to step outside the constraints of a system which throws away a universe of information as soon as original spectra are converted to three channels of data". Rosen & Jiang (1999)

Color holography: a new technique for reproduction of paintings

Until recently display holography was usually associated with 3D imaging. After the appearance of... more Until recently display holography was usually associated with 3D imaging. After the appearance of color holography it has become possible, however, to record holographic images of 2D objects, such as, for example, oil paintings. The realistic-looking virtual image recorded in a Denisyuk reflection hologram is the most suitable for such reproductions. A holographic contact recording of a painting reproduces the painting with all its texture details preserved, such as brush strokes, the painter's signature, etc. This means that an exact copy of the painting can be made, which can then be displayed at art exhibitions, museums, etc., when the original is not available. If an expensive painting is concerned, possessing an exact copy of the painting may also be important for insurance purposes, in case the painting is stolen or damaged. The advantage of a color contact hologram is that the hologram reconstruction process can be relaxed, as there is no need of spatial coherence ofthe white light source used to illuminate the hologram. In addition, no depth distortions are introduced as a function of the light source's distance from the plate. Only the angle of illumination is ofpnmary importance if good color reproduction is to be obtained. The paper discusses the rendition of color in a hologram, which is extremely important in this case. The holographic reproduction process of an oil painting is also described, and the major advantages of holographic reproduction are discussed together with its limitations.

Papers by Hans Bjelkhagen

Ultra-realistic imaging and OptoClones™

by Andreas Sarakinos and Hans Bjelkhagen

Practical Holography XXX: Materials and Applications, 2016

Crack profiles in mortar measured by holographic interferometry

Experimental Mechanics, Dec 1, 1988

In order to test the accuracy of theoretical fracture models for mortar and concrete, it is neces... more In order to test the accuracy of theoretical fracture models for mortar and concrete, it is necessary to have accurate measurements of the crack profiles. In this study, sandwich holographic interferometry has been used to find the crack profiles in a center-notched plate specimen loaded at the center of the notch. The results have shown that at low load levels

Processing Schemes

Springer eBooks, 1993

Color vision and colorimetry: theory and applications, SPIE press monograph Vol. PM105

Optics and Lasers in Engineering, Oct 1, 2004

HOLOGRAPHY, TECHNIQUES | Color Holography

New OVDs for Personalized Documents Based on Color Holography and Lippmann Photography

Springer eBooks, Nov 20, 2006

ABSTRACT

Holographic Portraits Made by Pulse Lasers

Leonardo, 1992

The author presents the history of holographic portraits made with pulse lasers and briefly discu... more The author presents the history of holographic portraits made with pulse lasers and briefly discusses the work of some of the scientists and artists working in this field. He then describes the recording technique that is used for making pulse portraits at Holicon Corporation (Evanston, Illinois) and the transfer setup that is used for making reflection copies of pulse masters at Holovision AB (Stockholm, Sweden). An extensive list of references relating to the art and technique of making holographic portraits is also provided.

Pulsed Fiber Holography: A New Technique For Hologram Interferometry

Optical Engineering, Aug 1, 1985

The advantage of the rapid development of fiber optics for communication purposes is that now hol... more The advantage of the rapid development of fiber optics for communication purposes is that now holographic investigations can be made much more flexible if fibers are used. The use of optical fibers in connection with cw lasers has already found interferometric applications within metrology. The possibility of using a pulsed laser with fibers will open important new applications for hologram interferometry within science, industry, and medicine. A fiber coupling technique for pulsed lasers is described, as well as suitable equipment for pulsed or cw laser holographic investigations. Possible applications also are discussed.

Holographic interferometry with multiple wavelengths

Applied optics, Jun 1, 1997

Silver-Halide Recording Materials for Holography and their Processing

The journal of photographic science, Mar 1, 1994

Optics for protection of man and environment against natural and technological disasters : selected contributions to the Second International Conference on Optics within Life Sciences, OWLS II, Münster, Germany, 4-9 October 1992

Elsevier eBooks, 1993

Science ethics: Aspects of responsibility of scientists, W. Buckel. Applications of optics for ea... more Science ethics: Aspects of responsibility of scientists, W. Buckel. Applications of optics for earthquake prediction, analysis and early warning: Laser holography and electronic speckle pattern interferometry in earthquake prediction and analysis, S. Takemoto. The resonance interaction of ultra low frequency electromagnetic emission with Van Allen belt particles as an earthquake predictor, A. Galper, S. Koldashov, S. Voronov. Applications of optics for atmospheric, soil, and marine pollution monitoring: Optical approaches to atmospheric monitoring, N. Sugimoto. Stratospheric trace gas measurements with Improved Limb Atmospheric Spectrometer (ILAS) for ADEOS satellite, Y. Sasano, M. Suzuki, T. Yokota. Remote sensing in forest decline by colour infrared aerial photography, M. Seger. Time-resolved chlorophyll fluorescence for early detection of forest decline, W. Schmidt, H. Schneckenburger. Ozone sensing by surface plasmon resonance, J.W. Sadowski, I. Vikholm. Fibre optic guided laser fluorescence for the real-time in situ measurement of petroleum contamination in soils, S.E. Apitz, S.H. Lieberman. Ocean monitoring - The application of flow cytometry for single aquatic particles, G.A. Tarran, P.H. Burkill, V. Kachel. Application of laser saturation fluorometry for study of environmental influences on primary photosynthetic processes, A.M. Chekalyuk, M.Yu. Gorbunov. New fluorescent method for remote detection of oil pollutions in natural water, S.V. Patsayeva. Classification of remote sensing images with neural networks, C. Cruse, P. Kempa. Applications of optics for cultural heritage protection: Holography in culture heritage protection, V.B. Markov. Optical profilometry for documentation in cultural heritage protection, X.-Y. Su, G. von Bally. Deformation monitoring in historical buildings by electronic speckle pattern interferometry ESPI, G. Guelker et al. Optical analysis of environmental influences on artefacts, P.M. Boone, D.H. van Nieuwenburgh. Applications of optics for disaster medicine and related medical specialities: Holographic biopsy and endoscopy for early detection of environmentally and radiation-induced cancers, H.I. Bjelkhagen, G. von Bally. Native fluorescence spectroscopic detection of the effects of chemotherapeutic retinoids on a cancer model of the aerodigestive tract, G.C. Tang et al. Monte-Carlo-Simulations of time-modulated methods in diaphanography, H. Pulvermacher. Analysis of corneal injuries by means of holographic interferometry, H. Kasprzak et al. Measurements of blood flow volume in retinal vessels using bio-speckle phenomena, Y. Aizu et al. The tip of the mantubrium in cat describes 3D motions which are strongly frequency dependent, W.F. Decraemer, S.M. Khanna. Removal of innercranial tumours and bone related to nerves with pulsed lasers in the UV and IR - Focussing and thermal effects, A.M. Stefanec. Applications of optics for bioindication and biosensors. (Part contents).

Modern Lippmann Photography

Holography and Holographic Pattern Recognition for Preservation and Evaluation of Cultural-Historic Sources

Naturwissenschaften, Dec 1, 1994

Practical Holography XXVIII: Materials and Applications

Practical Holography XXII: Materials and Applications

SPringer series in optical sciences, 1995

After-Treatment

SPringer series in optical sciences, 1993

ULTRA-REALISTIC IMAGING AND OPTOCLONES TM

by Andreas Sarakinos, Hans Bjelkhagen, and Alkis Lembessis

Recent improvements in solid state CW lasers, recording materials and light sources (such as LED ... more Recent improvements in solid state CW lasers, recording materials and light sources (such as LED lights) for displaying color holograms are described. Full-color analogue holograms can now be created with substantially better image characteristics than previously possible. To record ultra-realistic images depends on selecting the optimal recording laser wavelengths and employing ultra-fine-grain, silver-halide materials. The image quality is improved by using LED display light with improved spatial coherence. Recording museum artifacts using mobile holographic equipment is described. The most recent recorded such holograms (referred to as OptoClonesTM) are the Fabergé Eggs at the Fabergé Museum in St. Petersburg, Russia.

The True Colour of Photography

uk " We, the progeny of James Clerk Maxwell are beginning to recognize the need to return to the ... more uk " We, the progeny of James Clerk Maxwell are beginning to recognize the need to return to the genius of Newton, to resurrect the startling beauty of Lippmann and to step outside the constraints of a system which throws away a universe of information as soon as original spectra are converted to three channels of data". Rosen & Jiang (1999)

Color holography: a new technique for reproduction of paintings

Until recently display holography was usually associated with 3D imaging. After the appearance of... more Until recently display holography was usually associated with 3D imaging. After the appearance of color holography it has become possible, however, to record holographic images of 2D objects, such as, for example, oil paintings. The realistic-looking virtual image recorded in a Denisyuk reflection hologram is the most suitable for such reproductions. A holographic contact recording of a painting reproduces the painting with all its texture details preserved, such as brush strokes, the painter's signature, etc. This means that an exact copy of the painting can be made, which can then be displayed at art exhibitions, museums, etc., when the original is not available. If an expensive painting is concerned, possessing an exact copy of the painting may also be important for insurance purposes, in case the painting is stolen or damaged. The advantage of a color contact hologram is that the hologram reconstruction process can be relaxed, as there is no need of spatial coherence ofthe white light source used to illuminate the hologram. In addition, no depth distortions are introduced as a function of the light source's distance from the plate. Only the angle of illumination is ofpnmary importance if good color reproduction is to be obtained. The paper discusses the rendition of color in a hologram, which is extremely important in this case. The holographic reproduction process of an oil painting is also described, and the major advantages of holographic reproduction are discussed together with its limitations.

Ultra-realistic imaging and OptoClones™

by Andreas Sarakinos and Hans Bjelkhagen

Practical Holography XXX: Materials and Applications, 2016

Crack profiles in mortar measured by holographic interferometry

Experimental Mechanics, Dec 1, 1988

In order to test the accuracy of theoretical fracture models for mortar and concrete, it is neces... more In order to test the accuracy of theoretical fracture models for mortar and concrete, it is necessary to have accurate measurements of the crack profiles. In this study, sandwich holographic interferometry has been used to find the crack profiles in a center-notched plate specimen loaded at the center of the notch. The results have shown that at low load levels

Processing Schemes

Springer eBooks, 1993

Color vision and colorimetry: theory and applications, SPIE press monograph Vol. PM105

Optics and Lasers in Engineering, Oct 1, 2004

HOLOGRAPHY, TECHNIQUES | Color Holography

New OVDs for Personalized Documents Based on Color Holography and Lippmann Photography

Springer eBooks, Nov 20, 2006

ABSTRACT

Holographic Portraits Made by Pulse Lasers

Leonardo, 1992

The author presents the history of holographic portraits made with pulse lasers and briefly discu... more The author presents the history of holographic portraits made with pulse lasers and briefly discusses the work of some of the scientists and artists working in this field. He then describes the recording technique that is used for making pulse portraits at Holicon Corporation (Evanston, Illinois) and the transfer setup that is used for making reflection copies of pulse masters at Holovision AB (Stockholm, Sweden). An extensive list of references relating to the art and technique of making holographic portraits is also provided.

Pulsed Fiber Holography: A New Technique For Hologram Interferometry

Optical Engineering, Aug 1, 1985

The advantage of the rapid development of fiber optics for communication purposes is that now hol... more The advantage of the rapid development of fiber optics for communication purposes is that now holographic investigations can be made much more flexible if fibers are used. The use of optical fibers in connection with cw lasers has already found interferometric applications within metrology. The possibility of using a pulsed laser with fibers will open important new applications for hologram interferometry within science, industry, and medicine. A fiber coupling technique for pulsed lasers is described, as well as suitable equipment for pulsed or cw laser holographic investigations. Possible applications also are discussed.

Holographic interferometry with multiple wavelengths

Applied optics, Jun 1, 1997

Silver-Halide Recording Materials for Holography and their Processing

The journal of photographic science, Mar 1, 1994

Optics for protection of man and environment against natural and technological disasters : selected contributions to the Second International Conference on Optics within Life Sciences, OWLS II, Münster, Germany, 4-9 October 1992

Elsevier eBooks, 1993

Science ethics: Aspects of responsibility of scientists, W. Buckel. Applications of optics for ea... more Science ethics: Aspects of responsibility of scientists, W. Buckel. Applications of optics for earthquake prediction, analysis and early warning: Laser holography and electronic speckle pattern interferometry in earthquake prediction and analysis, S. Takemoto. The resonance interaction of ultra low frequency electromagnetic emission with Van Allen belt particles as an earthquake predictor, A. Galper, S. Koldashov, S. Voronov. Applications of optics for atmospheric, soil, and marine pollution monitoring: Optical approaches to atmospheric monitoring, N. Sugimoto. Stratospheric trace gas measurements with Improved Limb Atmospheric Spectrometer (ILAS) for ADEOS satellite, Y. Sasano, M. Suzuki, T. Yokota. Remote sensing in forest decline by colour infrared aerial photography, M. Seger. Time-resolved chlorophyll fluorescence for early detection of forest decline, W. Schmidt, H. Schneckenburger. Ozone sensing by surface plasmon resonance, J.W. Sadowski, I. Vikholm. Fibre optic guided laser fluorescence for the real-time in situ measurement of petroleum contamination in soils, S.E. Apitz, S.H. Lieberman. Ocean monitoring - The application of flow cytometry for single aquatic particles, G.A. Tarran, P.H. Burkill, V. Kachel. Application of laser saturation fluorometry for study of environmental influences on primary photosynthetic processes, A.M. Chekalyuk, M.Yu. Gorbunov. New fluorescent method for remote detection of oil pollutions in natural water, S.V. Patsayeva. Classification of remote sensing images with neural networks, C. Cruse, P. Kempa. Applications of optics for cultural heritage protection: Holography in culture heritage protection, V.B. Markov. Optical profilometry for documentation in cultural heritage protection, X.-Y. Su, G. von Bally. Deformation monitoring in historical buildings by electronic speckle pattern interferometry ESPI, G. Guelker et al. Optical analysis of environmental influences on artefacts, P.M. Boone, D.H. van Nieuwenburgh. Applications of optics for disaster medicine and related medical specialities: Holographic biopsy and endoscopy for early detection of environmentally and radiation-induced cancers, H.I. Bjelkhagen, G. von Bally. Native fluorescence spectroscopic detection of the effects of chemotherapeutic retinoids on a cancer model of the aerodigestive tract, G.C. Tang et al. Monte-Carlo-Simulations of time-modulated methods in diaphanography, H. Pulvermacher. Analysis of corneal injuries by means of holographic interferometry, H. Kasprzak et al. Measurements of blood flow volume in retinal vessels using bio-speckle phenomena, Y. Aizu et al. The tip of the mantubrium in cat describes 3D motions which are strongly frequency dependent, W.F. Decraemer, S.M. Khanna. Removal of innercranial tumours and bone related to nerves with pulsed lasers in the UV and IR - Focussing and thermal effects, A.M. Stefanec. Applications of optics for bioindication and biosensors. (Part contents).

Modern Lippmann Photography

Holography and Holographic Pattern Recognition for Preservation and Evaluation of Cultural-Historic Sources

Naturwissenschaften, Dec 1, 1994

Practical Holography XXVIII: Materials and Applications

Practical Holography XXII: Materials and Applications

SPringer series in optical sciences, 1995

After-Treatment

SPringer series in optical sciences, 1993

Commercial Silver-Halide Materials

Springer eBooks, 1993

Special Techniques

SPringer series in optical sciences, 1993

Color, Infrared and Ultraviolet Holography

SPringer series in optical sciences, 1993

Holography and Philately (Introduction + sample pages)

SUMMARY:mma Ultra-high resolution holograms are now finding commercial and industrial application... more SUMMARY:mma Ultra-high resolution holograms are now finding commercial and industrial applications in such areas as museum artefact displays, holographic maps, 3D medical imaging, and advertising. Ultra-Realistic Imaging: Advanced Techniques in Analogue and Digital Colour Holography brings together a comprehensive discussion of key methods that enable holography to be used as a technique of ultra-realistic imaging. After a historical review of progress in holography, the book: • Discusses CW recording lasers, pulsed holography lasers, and reviews optical designs for many of the principal laser types with emphasis on attaining the parameters necessary for digital and analogue colour holography • Gives a full review of current photosensitive materials for colour holography • Covers modern methods of analogue colour holography and digital holographic printing • Introduces mathematical and geometrical notation for horizontal parallax-only holograms and practical computational algorithms for the full-parallax case • Reviews systems and the image processing algorithms required to convert the raw image data to the format required by digital printers for colour holograms • Develops the physical theory of the holographic grating and the hologram • Provides an up-to-date review of illumination sources, including LED and laser diode sources Written by leaders in colour holography, this handbook provides complete coverage of colour holographic techniques, including applications. The book covers not only the optics and theory behind such holographic 3D imaging techniques, but also laser technologies, recording devices, data acquisition and processing techniques, materials for recording colour holograms, and current applications of ultra-realistic images used in museums and for other display purposes. The book can be ordered from CRC Press:

Ultra-Realistic Imaging

by Hans Bjelkhagen and David Brotherton-Ratcliffe

Ultra-Realistic lmaging may be defined as any imaging technique which is able to record and recon... more Ultra-Realistic lmaging may be defined as any imaging technique which is able to record and reconstruct the visible electromagnetic light-field scattered from a real-world object or scene with a resolution better than or equal to that of the unaided human eye. This book is devoted to a discussion of how the goal of ultra-realistic imaging may be attained through the application of the interferential methods of modern analogue and digital holography-and in particular through vol ume phase holography. Ultra-high resolution holograms are now finding commercial and industrial applications in such areas as holographic maps, 3D medical imaging, and consumer devices. In addition to discussing the optics and theory behind these holographic systems, the book details laser technologies, printer design and recording devices, data acquisition and processing techniques, software algorithms, and materials for reproduction. Leading researchers in the field cover the key holographic technologies underpinning the new field of ultra-realistic imaging. Includes colour images throughout the text. Hans Bjelkhagen and David Brotherton-Ratcl iffe