Bozhen Zhang, X. Liu, Jun Dai, Ying Wang, Wen Wang
Classical stochastic electromagnetic field assumes that the number of steps is infinite, but in practice, the number of steps for random walk is limited, even though the number of steps is large. Therefore, the statistical properties of finite-step random phasor sums are different from those of classical ones. As an example, the negative exponential probability density function of classical intensity speckles is not suitable for speckles with limited steps. In some applications, including but not limited to synthetic-aperture radar (SAR) imagery, wireless communication and wavelet analysis, when the probability density function of the classical speckle is used to calculate, the acquired result is often biased, and can’t provide appropriate estimation with reasonable accuracy. In this paper, we make the statistical analysis of the Stokes parameters of the random polarization phasor sums with a limited number of steps. The statical properties for the stochastic optical fields generated with a limited number of steps are presented with different applications in optical engineering
{"title":"Statistics of random optical field generated by a random walk with a finite number of steps","authors":"Bozhen Zhang, X. Liu, Jun Dai, Ying Wang, Wen Wang","doi":"10.1117/12.2615505","DOIUrl":"https://doi.org/10.1117/12.2615505","url":null,"abstract":"Classical stochastic electromagnetic field assumes that the number of steps is infinite, but in practice, the number of steps for random walk is limited, even though the number of steps is large. Therefore, the statistical properties of finite-step random phasor sums are different from those of classical ones. As an example, the negative exponential probability density function of classical intensity speckles is not suitable for speckles with limited steps. In some applications, including but not limited to synthetic-aperture radar (SAR) imagery, wireless communication and wavelet analysis, when the probability density function of the classical speckle is used to calculate, the acquired result is often biased, and can’t provide appropriate estimation with reasonable accuracy. In this paper, we make the statistical analysis of the Stokes parameters of the random polarization phasor sums with a limited number of steps. The statical properties for the stochastic optical fields generated with a limited number of steps are presented with different applications in optical engineering","PeriodicalId":250235,"journal":{"name":"International Conference on Correlation Optics","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129038252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Kopylchuk, I. Nikolaychuk, A. Motrich, O. Ushenko
Various aspects of pathology of the pancreas (PP), functional insufficiency of which causes the development of hyperglycemia, insulin resistance, metabolic syndrome, and type I and type II diabetes mellitus have attracted considerable attention among researchers. Among the exogenous influences that can have a negative effect on metabolic processes in this organ, an imbalance of macronutrients in the diet and drug-induced organ injury due to uncontrolled consumption of commonly available antipyretic analgesics, of which paracetamol (acetaminophen) is the most common are of great importance [1].
{"title":"Algorithm for diagnosing pancreatic endocrine dysfunction based on biochemical and laser polarimetric parameters","authors":"H. Kopylchuk, I. Nikolaychuk, A. Motrich, O. Ushenko","doi":"10.1117/12.2616526","DOIUrl":"https://doi.org/10.1117/12.2616526","url":null,"abstract":"Various aspects of pathology of the pancreas (PP), functional insufficiency of which causes the development of hyperglycemia, insulin resistance, metabolic syndrome, and type I and type II diabetes mellitus have attracted considerable attention among researchers. Among the exogenous influences that can have a negative effect on metabolic processes in this organ, an imbalance of macronutrients in the diet and drug-induced organ injury due to uncontrolled consumption of commonly available antipyretic analgesics, of which paracetamol (acetaminophen) is the most common are of great importance [1].","PeriodicalId":250235,"journal":{"name":"International Conference on Correlation Optics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127753356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The possibility of simultaneous measurement of the refractive index and the thickness of optically transparent films in a classical interferometer with a modified illuminator is shown. The illuminator includes a source of coherent and incoherent lighting. Analysis of the correlation and interference fringes makes it possible to simultaneously determine the parameters of the refractive index and thickness for the considered region of the film. The method eliminates errors associated with the need to use different methods for measuring parameters.
{"title":"Measurement of parameters of optically transparent films","authors":"Myroslav T. Strynadko","doi":"10.1117/12.2616371","DOIUrl":"https://doi.org/10.1117/12.2616371","url":null,"abstract":"The possibility of simultaneous measurement of the refractive index and the thickness of optically transparent films in a classical interferometer with a modified illuminator is shown. The illuminator includes a source of coherent and incoherent lighting. Analysis of the correlation and interference fringes makes it possible to simultaneously determine the parameters of the refractive index and thickness for the considered region of the film. The method eliminates errors associated with the need to use different methods for measuring parameters.","PeriodicalId":250235,"journal":{"name":"International Conference on Correlation Optics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123400900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. N. Nikitchuk, O. L. Korenivska, D. Shtofel, J. Tussupov, V. Benedytskyi, T. Vakaliuk, I. Kobylianska
The article explores the possibility of applying modifications to the R/S- analysis method for pulsogram processing under conditions where the noise level is unknown. It is shown that a fast algorithm for calculating the Hirst coefficient can be used to estimate the noise level in a pulse signal. The R/S-analysis method for pulsogram processing has been improved by optimizing the initial conditions, which makes it possible to select the required pulse wave registration interval.
{"title":"Qualitative analysis of pulsograms by fractility indices","authors":"T. N. Nikitchuk, O. L. Korenivska, D. Shtofel, J. Tussupov, V. Benedytskyi, T. Vakaliuk, I. Kobylianska","doi":"10.1117/12.2617387","DOIUrl":"https://doi.org/10.1117/12.2617387","url":null,"abstract":"The article explores the possibility of applying modifications to the R/S- analysis method for pulsogram processing under conditions where the noise level is unknown. It is shown that a fast algorithm for calculating the Hirst coefficient can be used to estimate the noise level in a pulse signal. The R/S-analysis method for pulsogram processing has been improved by optimizing the initial conditions, which makes it possible to select the required pulse wave registration interval.","PeriodicalId":250235,"journal":{"name":"International Conference on Correlation Optics","volume":"356 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123106308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jun Zheng, Zhebo Chen, O. Ushenko, O. Dubolazov, O. Olar, M. Gavrilyak, I. Soltys, Christina V. Felde, M. Gorsky, N. Horodynska, O. Arkhelyuk, O. Konovchuk
A collection of layered maps of the depolarisation due to diffuse layers of polyvinyl acetate are produced using a polarization-holographic Mueller matrix method approach. The topography of maps of the diffuse layers of polyvinyl acetate relates to the scattering multiplicity within the volume and the specific of polycrystalline structure. The overall depolarisation map is a convolution of the effects of these two factors. Through statistical analysis, the dependences of the magnitudes of the first to fourth order statistical moments are determined. These moments characterise the changing distributions of the depolarisation values through the volume of diffuse layers of polyvinyl acetate with different concentration. Dehydrated polyvinyl acetate layers depolarisation maps are characterised by larger average and dispersion, and less skewness and kurtosis, compared to the distributions for the diffuse "dehydrated" layers of polyvinyl acetate. This work demonstrates that a polarization-holographic Mueller matrix method can be applied to the assessment of the 3D morphology of diffuse layers of polyvinyl acetate, with applications in diagnosis – differentiation of the degree of adhesion.
{"title":"Mueller-matrix microscopy of diffuse layers of polyvinyl acetate with digital holographic reconstruction of layer-by-layer depolarization maps","authors":"Jun Zheng, Zhebo Chen, O. Ushenko, O. Dubolazov, O. Olar, M. Gavrilyak, I. Soltys, Christina V. Felde, M. Gorsky, N. Horodynska, O. Arkhelyuk, O. Konovchuk","doi":"10.1117/12.2617049","DOIUrl":"https://doi.org/10.1117/12.2617049","url":null,"abstract":"A collection of layered maps of the depolarisation due to diffuse layers of polyvinyl acetate are produced using a polarization-holographic Mueller matrix method approach. The topography of maps of the diffuse layers of polyvinyl acetate relates to the scattering multiplicity within the volume and the specific of polycrystalline structure. The overall depolarisation map is a convolution of the effects of these two factors. Through statistical analysis, the dependences of the magnitudes of the first to fourth order statistical moments are determined. These moments characterise the changing distributions of the depolarisation values through the volume of diffuse layers of polyvinyl acetate with different concentration. Dehydrated polyvinyl acetate layers depolarisation maps are characterised by larger average and dispersion, and less skewness and kurtosis, compared to the distributions for the diffuse \"dehydrated\" layers of polyvinyl acetate. This work demonstrates that a polarization-holographic Mueller matrix method can be applied to the assessment of the 3D morphology of diffuse layers of polyvinyl acetate, with applications in diagnosis – differentiation of the degree of adhesion.","PeriodicalId":250235,"journal":{"name":"International Conference on Correlation Optics","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117308596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Orbital angular momentum (OAM) beams have the potential to increase the information-carrying capacity because of the extra degrees of freedom associated with them. Traditional methods for mode detection and de-multiplexing are complex and require expensive optical hardware. We propose a very simple and cost effective deep learning based model for demultiplexing OAM modes at the receiver. In this method we have used a random phase mask of known inhomogeneity to generate a scattered field of OAM mode and the intensity images of these scattered field are used as an input to the Convolutional Neural Network. The model is trained for various Laguerre-Gaussian (𝐿𝐺𝑝𝑙) modes carrying OAM with 𝑝 = 0 and 𝑙 = 1,2,3,4,5,6,7,8. The model is tested for various set of images and the overall accuracy of each dataset is <99%. To demonstrate the proof of concept we simulated an experiment to generate the speckle field at the receiver of optical communication system for demultiplexing OAM modes and decoding the 3-bit information.
{"title":"Deep learning assisted OAM modes demultiplexing","authors":"Venugopal Raskatla, Vijay Kumar","doi":"10.1117/12.2615170","DOIUrl":"https://doi.org/10.1117/12.2615170","url":null,"abstract":"Orbital angular momentum (OAM) beams have the potential to increase the information-carrying capacity because of the extra degrees of freedom associated with them. Traditional methods for mode detection and de-multiplexing are complex and require expensive optical hardware. We propose a very simple and cost effective deep learning based model for demultiplexing OAM modes at the receiver. In this method we have used a random phase mask of known inhomogeneity to generate a scattered field of OAM mode and the intensity images of these scattered field are used as an input to the Convolutional Neural Network. The model is trained for various Laguerre-Gaussian (𝐿𝐺𝑝𝑙) modes carrying OAM with 𝑝 = 0 and 𝑙 = 1,2,3,4,5,6,7,8. The model is tested for various set of images and the overall accuracy of each dataset is <99%. To demonstrate the proof of concept we simulated an experiment to generate the speckle field at the receiver of optical communication system for demultiplexing OAM modes and decoding the 3-bit information.","PeriodicalId":250235,"journal":{"name":"International Conference on Correlation Optics","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125435449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, a three-dimensional representation of the probability density distribution of the Stokes parameters in polarization speckle was developed. Following the electron cloud model used widely to visualize the hydrogen atomic orbitals, we present the density of the dots sculptured in the Hilbert space shows the probability density of finding the Stokes parameters in polarization speckle. Advantages of the electron cloud presentation for the statistics of the Stokes parameters are also discussed.
{"title":"Visualizing probability density distribution of polarization speckle with electron cloud diagrams","authors":"M. Zang, X. Liu, Jun Dai, Ying Wang, Wen Wang","doi":"10.1117/12.2615510","DOIUrl":"https://doi.org/10.1117/12.2615510","url":null,"abstract":"In this paper, a three-dimensional representation of the probability density distribution of the Stokes parameters in polarization speckle was developed. Following the electron cloud model used widely to visualize the hydrogen atomic orbitals, we present the density of the dots sculptured in the Hilbert space shows the probability density of finding the Stokes parameters in polarization speckle. Advantages of the electron cloud presentation for the statistics of the Stokes parameters are also discussed.","PeriodicalId":250235,"journal":{"name":"International Conference on Correlation Optics","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114329223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The problem of holographic associative memory in the framework of the correlation-optical approach is discussed. Analysis of models of referenceless holograms and nonlinearly registered off-axis holograms, reconstructed in associative method, shows a wide range of useful properties of such holograms. Not only to reconstruct the missing part of the stored data set but also to detect small changes ("errors") in the recorded picture an array of data with error correction for an incomplete version of the array as well as for the implementation of high-performance heteroassociative reconstruction based on the non-interference mechanism of partial signals. It is shown that the visually assessed quality of the reconstructed associative response can approach the image quality achieved in conventional off-axis holography.
{"title":"Correlation-optics approach for holographic associative memories problem","authors":"G. V. Bogatyryova, Christina V. Felde","doi":"10.1117/12.2615313","DOIUrl":"https://doi.org/10.1117/12.2615313","url":null,"abstract":"The problem of holographic associative memory in the framework of the correlation-optical approach is discussed. Analysis of models of referenceless holograms and nonlinearly registered off-axis holograms, reconstructed in associative method, shows a wide range of useful properties of such holograms. Not only to reconstruct the missing part of the stored data set but also to detect small changes (\"errors\") in the recorded picture an array of data with error correction for an incomplete version of the array as well as for the implementation of high-performance heteroassociative reconstruction based on the non-interference mechanism of partial signals. It is shown that the visually assessed quality of the reconstructed associative response can approach the image quality achieved in conventional off-axis holography.","PeriodicalId":250235,"journal":{"name":"International Conference on Correlation Optics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124326983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The article is devoted to research on determining the roughness parameters of antifriction composite parts based on tool steel R6M5K5 grinding waste for high-speed printing equipment by optical profilometry using an optical profilometer ProfilControl 7S. It is shown the granularity, the elbor wheel’s bond material and the modes of fine elbor grinding significantly affect the surface roughness parameter Ra. The roughness parameter Ra best values, which meet the high requirements for the surface quality of the antifriction parts for printing machines, provide elbor LO grinding wheels with a grain size of 14–28 μm on a bakelite-rubber bond and fine cutting modes. It is recommended to carry out the flat elbor grinding at a wheel speed of 22 m/s, longitudinal feed of 2 m/min, cross feed of 0.1 mm/double stroke and cutting depth of 2 μm. Studies have shown the use of high-precision profilometric equipment allows obtaining not only accurate data on the surface roughness, but also helps to regulate the technological modes of fine elbor (cubonite CBN) grinding of working surfaces to obtain high quality parameters. Using the most up-to-date optical profilometric analysis for studying the surface quality parameters allowed correctly choosing the modes of new composite antifriction parts' processing and also to provide reliable results.
{"title":"Analysis of the parts' roughness parameters of high-speed printing equipment by optical profilometry","authors":"T. Roik, A. Brovkyn, A. Dubolazov","doi":"10.1117/12.2615584","DOIUrl":"https://doi.org/10.1117/12.2615584","url":null,"abstract":"The article is devoted to research on determining the roughness parameters of antifriction composite parts based on tool steel R6M5K5 grinding waste for high-speed printing equipment by optical profilometry using an optical profilometer ProfilControl 7S. It is shown the granularity, the elbor wheel’s bond material and the modes of fine elbor grinding significantly affect the surface roughness parameter Ra. The roughness parameter Ra best values, which meet the high requirements for the surface quality of the antifriction parts for printing machines, provide elbor LO grinding wheels with a grain size of 14–28 μm on a bakelite-rubber bond and fine cutting modes. It is recommended to carry out the flat elbor grinding at a wheel speed of 22 m/s, longitudinal feed of 2 m/min, cross feed of 0.1 mm/double stroke and cutting depth of 2 μm. Studies have shown the use of high-precision profilometric equipment allows obtaining not only accurate data on the surface roughness, but also helps to regulate the technological modes of fine elbor (cubonite CBN) grinding of working surfaces to obtain high quality parameters. Using the most up-to-date optical profilometric analysis for studying the surface quality parameters allowed correctly choosing the modes of new composite antifriction parts' processing and also to provide reliable results.","PeriodicalId":250235,"journal":{"name":"International Conference on Correlation Optics","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121702292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The condenser is one of the most important components in many transmitted light compound microscopes. In this Letter, was shown that such a condenser can be replaced by a solution of liquid crystal in a polymer matrix (PDLC) and back light lamp to achieve greater imaging flexibility and functionality. By changing the voltage applying to the PDLC, we change the amplitude ratio of the non-scattered and the singly forward scattered interfering components significantly affects the spatial-frequency filtering by PDLC. Without mechanically scanning the sample or changing the microscope setup, the proposed approach can be used for dark-field imaging, bright-field imaging, microscopy sectioning, and digital refocusing. Images of a starfish embryo were acquired by using such an approach for demonstration.
{"title":"Tunable microscopy illuminator by using polymer dispersed liquid crystals","authors":"P. Maksimyak, A. Maksimyak, A. Nehrych","doi":"10.1117/12.2615159","DOIUrl":"https://doi.org/10.1117/12.2615159","url":null,"abstract":"The condenser is one of the most important components in many transmitted light compound microscopes. In this Letter, was shown that such a condenser can be replaced by a solution of liquid crystal in a polymer matrix (PDLC) and back light lamp to achieve greater imaging flexibility and functionality. By changing the voltage applying to the PDLC, we change the amplitude ratio of the non-scattered and the singly forward scattered interfering components significantly affects the spatial-frequency filtering by PDLC. Without mechanically scanning the sample or changing the microscope setup, the proposed approach can be used for dark-field imaging, bright-field imaging, microscopy sectioning, and digital refocusing. Images of a starfish embryo were acquired by using such an approach for demonstration.","PeriodicalId":250235,"journal":{"name":"International Conference on Correlation Optics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123025235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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