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Applied Sciences
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Digital Holography and Its Application
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Digital Holography and Its Application

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (20 July 2024) | Viewed by 7944

Special Issue Editor

Dr. Davood Khodadad

E-Mail Website
Guest Editor
Department of Applied Physics and Electronics, Umeå Universitet, 90187 Umeå, Sweden
Interests: signal and image analysis; imaging systems; digital holography; speckle metrology; optical metrology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Applied Sciences welcomes submissions for a Special Issue on "Digital holography and its application for Non-Destructive Testing (NDT)." Digital holography, which was founded in the twentieth century, has adapted and evolved into a remarkable field of study over the last few decades. Advances in signal processing, computers, computational optics, deep learning, and statistical analysis have resulted in the transformation of bulky, heavy, and slow digital holographic imagers into compact, lightweight, and faster devices. It enables the creation of multiple images on a single plate, including 3D images for real-time analysis. Digital holographic technologies can easily be combined with other technologies for new applications.

There have been many useful Special Issues on the topic of digital holography published in various journals; what distinguishes this Special Issue is that it focuses on NDT in a wide range of applications for various sciences. Applications for digital holography can be found in imaging science, mechanics, and biomedical engineering. However, the applications have the potential to be widespread in a variety of multidisciplinary fields. This Special Issue encourages all researchers to consider various applications and possible novelties and provides an opportunity for their ideas to become visible.

This Special Issue covers all the areas of digital holography related to NDT including, but not limited to, incoherent imaging, Fresnel incoherent correlation holography (FINCH), optical scanning holography, coded aperture imaging, compressive sensing, holographic display technologies, fluorescence microscopy, Raman holography, speckle metrology, optical instrumentation, computational optics, deep learning, computer generated holography, biomedical imaging, holographic tomography, synthetic aperture imaging, quantitative phase imaging, spectral imaging, speckle metrology, imaging through scattering layers and turbid media, holographic optical elements, ghost imaging, metrology, bio speckle analysis, 3D imaging, polarization holography, and ultrafast holographic imaging technologies.

Dr. Davood Khodadad
Guest Editor

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Published Papers (5 papers)

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Research

16 pages, 8523 KiB  
Article
A Layered Method Based on Depth of Focus for Rapid Generation of Computer-Generated Holograms
by Xiandong Ma, Jinbin Gui, Junchang Li and Qinghe Song
Appl. Sci. 2024, 14(12), 5109; https://doi.org/10.3390/app14125109 - 12 Jun 2024
Viewed by 756
Abstract
In this paper, a layered method based on focal depth is proposed for the fast generation of computational holograms. The method layers objects with focal depth as spacing and approximates triangles on the object as projections on the layers based on the physical [...] Read more.
In this paper, a layered method based on focal depth is proposed for the fast generation of computational holograms. The method layers objects with focal depth as spacing and approximates triangles on the object as projections on the layers based on the physical properties of the focal depth to simplify the computation. Finally, the diffraction distributions of all layers are calculated via angular spectral diffraction and superimposed to obtain the hologram. The proposed method has been proven to be about 20 times faster on a CPU than the analytical polygon-based method. A hologram containing tens of thousands of triangles can be computed on a GPU in a fraction of a second. In addition, this method makes it easy to attach complex textures, which is difficult with polygon-based analysis methods. Finally, holograms of objects with complex textures were generated, and the three-dimensionality of these holograms was confirmed by numerical and optical reconstruction. Full article
(This article belongs to the Special Issue Digital Holography and Its Application)
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8 pages, 4459 KiB  
Communication
Recording of Full-Color Snapshot Digital Holographic Portraits Using Neural Network Image Interpolation
by Philippe Gentet, Matteo Coffin, Yves Gentet and Seung-Hyun Lee
Appl. Sci. 2023, 13(22), 12289; https://doi.org/10.3390/app132212289 - 13 Nov 2023
Cited by 4 | Viewed by 2276
Abstract
For 60 years, high-energy pulsed lasers have enabled the recording of extremely realistic portraits of living people within a few nanoseconds. In the 21st century, this confidential technique, which requires great skill and equipment, has almost disappeared because of the final monochromatic color [...] Read more.
For 60 years, high-energy pulsed lasers have enabled the recording of extremely realistic portraits of living people within a few nanoseconds. In the 21st century, this confidential technique, which requires great skill and equipment, has almost disappeared because of the final monochromatic color of the holograms, which does not appeal to the public. In this study, we show that ultra-realistic, full-color, and full-parallax snapshot holographic portraits can be recorded using a limited number of synchronized HD cameras. Experiments were successfully conducted using the digital CHIMERA holographic stereogram printing technique combined with image interpolation using a neural network. This new recording method allows holographic portraits to be developed and disseminated to the public on a larger scale. Full article
(This article belongs to the Special Issue Digital Holography and Its Application)
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16 pages, 16892 KiB  
Article
Multi-Object Deep-Field Digital Holographic Imaging Based on Inverse Cross-Correlation
by Jieming Zhao, Zhan Gao, Shengjia Wang, Yuhao Niu, Lin Deng and Ye Sa
Appl. Sci. 2023, 13(20), 11430; https://doi.org/10.3390/app132011430 - 18 Oct 2023
Cited by 1 | Viewed by 1259
Abstract
To address the complexity of small or unique reconstruction distances in digital holography, we propose an inverse cross-correlation-based algorithm for the digital holographic imaging of multiplanar objects with a large depth of field. In this method, a planar output mapping is closely around [...] Read more.
To address the complexity of small or unique reconstruction distances in digital holography, we propose an inverse cross-correlation-based algorithm for the digital holographic imaging of multiplanar objects with a large depth of field. In this method, a planar output mapping is closely around the objects, and it is established by calculating the image inverse cross-correlation matrix of the reconstructed image at similar reconstruction distances, whereby the object edges serve as the result guide. Combining the search for edge planes with the depth estimation operator, the depth of field of digital holography is improved, thus allowing for a digital holography that is capable of meeting the requirements of the holographic imaging of multiplanar objects. Compared with the traditional depth estimation operator method, the proposed method solves the reconstruction ambiguity problem in multiple planes with a simple optical path, and no additional optical or mechanical devices need to be added, thus greatly improving the reconstruction quality. The numerical calculation results and the experimental results with multiplanar samples validate the effectiveness of the proposed method. Full article
(This article belongs to the Special Issue Digital Holography and Its Application)
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13 pages, 6723 KiB  
Article
Temperature Sensing in Space and Transparent Media: Advancements in Off-Axis Digital Holography and the Temperature Coefficient of Refractive Index
by Davood Khodadad, Behnam Tayebi, Amin Saremi and Satyam Paul
Appl. Sci. 2023, 13(14), 8423; https://doi.org/10.3390/app13148423 - 21 Jul 2023
Cited by 2 | Viewed by 1525
Abstract
An off-axis digital holographic interferometry technique integrated with a Mach–Zehnder interferometer based setup is demonstrated for measuring the temperature and temperature profile of a transparent medium. This technique offers several advantages: it does not require precise optomechanical adjustments or accurate definition of the [...] Read more.
An off-axis digital holographic interferometry technique integrated with a Mach–Zehnder interferometer based setup is demonstrated for measuring the temperature and temperature profile of a transparent medium. This technique offers several advantages: it does not require precise optomechanical adjustments or accurate definition of the frequency carrier mask, making it simple and cost-effective. Additionally, high-quality optics are not necessary. The methodology relies on measuring the phase difference between two digitally reconstructed complex wave fields and utilizing the temperature coefficient of the refractive index. In this way, we presented an equation of the temperature as a function of phase changes and the temperature coefficient of refractive index. This approach simplifies the calculation process and avoids the burden of complicated mathematical inversions, such as the inverse Abel transformation. It also eliminates the need for additional work with the Lorentz–Lorentz equation and Gladstone–Dale relation and can be extend for 3D measurements. Full article
(This article belongs to the Special Issue Digital Holography and Its Application)
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11 pages, 3533 KiB  
Article
Serial Maximum a Posteriori Detection of Two-Dimensional Generalized Partial Response Target for Holographic Data Storage Systems
by Thien An Nguyen and Jaejin Lee
Appl. Sci. 2023, 13(9), 5247; https://doi.org/10.3390/app13095247 - 22 Apr 2023
Cited by 2 | Viewed by 1371
Abstract
Holographic data storage (HDS) is an emerging technology that promises to revolutionize digital data storage and access. Unlike traditional storage media such as hard drives and flash memory, HDS uses light to write and read page-oriented two-dimensional (2D) data from volume media. This [...] Read more.
Holographic data storage (HDS) is an emerging technology that promises to revolutionize digital data storage and access. Unlike traditional storage media such as hard drives and flash memory, HDS uses light to write and read page-oriented two-dimensional (2D) data from volume media. This allows for significantly higher densities and faster data transfer rates in HDS systems. However, 2D interference is a serious issue in HDS due to hologram dispersion during the reading process. Therefore, we present a novel detection algorithm based on maximum a posteriori (MAP) detection to mitigate 2D interference. In our proposed model, we inherited the structure of the serial generalized partial response target to design the serial structure for MAP detection. The simulation results show that the proposed model can achieve a high bit error rate performance. Full article
(This article belongs to the Special Issue Digital Holography and Its Application)
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