152 research outputs found
Scattering of Light from the Systemic Circulatory System
No full textThere are many factors of methodological origin that influence the measurement of optical properties of the entire circulatory system which consists of blood as the basic component. The basic idea of this review article is to provide the optical properties of the circulatory system with all those factors of influence that have been employed in biomedical optics for different applications. We begin with the available optical properties, i.e., absorption, scattering and, reduced scattering coefficient, in general for any tissue inside the human body and prominent scattering theories (e.g., light, X-rays, neutrons) that are helpful in this regard. We have reviewed and compiled already available formulas and their respective available data for different human tissues for these optical properties. Then we have descended to the blood composition and to different scattering techniques available in the literature to study scattering and light propagation inside blood. We have reviewed both computational and theoretical scattering techniques
To study the Mueller matrix polarimetry for the characterization of wood and Teflon flat samples
No full textIn our manuscript, we carry out the Mueller matrix polarimetry for the characterization of wood and polytetrafluoroethylene (PTFE) or Teflon flat samples. Polarization measurements allows to enhance the imaging contrast of the anisotropic wood (Horizontal (H) and Vertical (V)) superficial fibers tissues and isotropic material (Teflon). We study the polarization-sensitive parameters for better investigations of the micro- and macro- structural and optical properties of complex tissues. The polarization imaging methodology has evolved to accept increasingly complex parametric measurements. The Mueller matrix is now generally calculated using a polarimetry technique. Herein, we attempt to study the difference between wood H, wood V, and Teflon samples. We calculated 3×3 Mueller matrix, which can be used to describe an intuitive overview of the material characteristics. We have interpreted our experimental results of Mueller matrix coefficients in terms of graphical representation using two different approaches named MS1 and MS2. This study gives us a new idea on the contrast mechanisms of polarization-sensitive measurements for different samples wood H, wood V, and Teflon and may provide new and simple diagnostic techniques for biological applications
Cloaking using anisotropic multilayer circular cylinder
No full textIn this article, we study a homogenization model for cloaking applications. In the given model, we consider an isotropic inner layer, which iscoated with a multilayer anisotropic circular cylinder. We describe the electrostatic response of a polarly radially anisotropic (PRA) multilayercircular cylinder. It consists of different components of permittivity in radial and tangential directions for each layer. We have shown themathematical derivation of the polarizability and effective permittivity of a PRA multilayer circular cylinder. Moreover, we demonstrate thecloaking behavior using a PRA multilayer circular cylinder. Meanwhile, we test our formation with advanced computational approaches.During our numerical test, we have investigated the numerical results of the polarizability of a PRA multilayer circular cylinder. We employan inner cloak surrounded by a multilayer anisotropic circular cylinder. However, for an ideal cloak, the contrast between the permittivityparameters approaches infinity
Multiple scattering by two PEC sphere
No full textAn analysis of multiple scattering by two Perfect Electric Conducting (PEC) sphere using translation Addition Theorem (AT) for spherical vector wave equation is presented. Specifically, Cruzan formalism is used to represent the AT for spherical harmonics, which introduced translation coefficients for transformation of spherical harmonic from one coordinate to another. These coefficients allow a very efficient solution for the calculation of multiple scattering electric field using two PEC sphere in a near zone region. The numerical simulations are included the validity of the multiple scattering behavior
Mueller matrix polarimetry for differentiating characteristic features of different materials (wood, shinning steel, unpolished plastic)
No full textPolarization measurements improve the imaging contrast by using various samples (wood,shinning steel,unpolished plastic). For better explanations of the micro and macro-structures and basic characteristics of the materials, we perform Mueller matrix imaging on various samples, expressed by the characteristic features of the 3×3 Mueller matrix elements. This research gives new ideas for various samples on the contrast mechanisms of Mueller matrix components, which can provide new diagnostic techniques for biomedical applications
Absorption and invisibility of a Transparent Radial Anisotropy (TRA) cylinder
No full textThis article presents the inspection of a Transparent Radially Anisotropic (TRA) cylinder with permittivity dyadic, in the electrostatic settings. The quasistatic polarizability of the TRA cylinder with the values and signs of permittivity components offering different interesting features, involving absorbance, anomalous losses, resonant singularities, invisibility. In this manuscript, we have a special focus on the electrostatic response of a circular cylinder with a certain condition of
anisotropic parameters. We study the stimulating behaviour of polarizability of a TRA cylinder in quadrant (plane geometry). We have also computed the TRA cylinder behavior as a cloak using suitable choices of the anisotropic parameters
Erratum: “Cloaking using anisotropic multilayer circular cylinder” [AIP Adv. 10, 095312 (2020)]
No full textIn this article, we study a homogenization model for cloaking applications. In the given model, we consider an isotropic inner layer, which is
coated with a multilayer anisotropic circular cylinder. We describe the electrostatic response of a polarly radially anisotropic (PRA) multilayer
circular cylinder. It consists of different components of permittivity in radial and tangential directions for each layer. We have shown the
mathematical derivation of the polarizability and effective permittivity of a PRA multilayer circular cylinder. Moreover, we demonstrate the
cloaking behavior using a PRA multilayer circular cylinder. Meanwhile, we test our formation with advanced computational approaches.
During our numerical test, we have investigated the numerical results of the polarizability of a PRA multilayer circular cylinder. We employ
an inner cloak surrounded by a multilayer anisotropic circular cylinder. However, for an ideal cloak, the contrast between the permittivity
parameters approaches infinity
Scattering from a cylindrical obstacle deeply buried beneath a planar non-integer dimensional dielectric slab using Kobayashi potential method
No full textMathematical formulation for the far-zone field scattered by a cylindrical obstacle deeply
buried beneath a planar dielectric slab has been presented. Method known as Kobayashi
potential method has been employed for this purpose and transverse electric uniform plane
wave has been used as a source of excitation. It has been assumed that dimension of space
within slab is non-integer in the direction normal to planar interfaces of the slab. Moreover,
it has also been assumed that distance of each interface of the slab from obstacle is very large
as compared to size of the obstacle. Due to this assumption scattered field after reflection
from the slab has no interaction with the obstacle and the situation has been called deeply
buried. Field pattern has also been obtained and compared with the published work
Interpreting Mueller matrix of anisotropic material
No full textThe polarization imaging methodology has evolved to accept increasingly complex parametric measurements. The Mueller matrix is now generally calculated using a polarimetry technique. In our manuscript, we study the anisotropic wood sample using polarization imaging techniques. Herein, We attempt to study the difference between wood horizontal and vertical fibers. We calculated 3×3 Mueller matrix elements, which can be used to described an intuitive overview of the anisotropic material characteristics. We interpreted experimental results of Mueller matrix coefficients in terms of a graphical representation
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