- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Study of In-Plane Wave Propagation in 2-Dimensional Anisotropic Elastic Metamaterials
摘要： Objective Due to its multiple applications, elastic metamaterial is of great interest for researchers today. In this article, in-plane wave propagation in 2-D anisotropic metamateials with anisotropic density and anisotropic Young’s modulus is comprehensively studied. Method Characteristics of wave propagation in 2-D metamaterial with different combinations of negative properties are provided, and the unnatural phenomenon is also explained. Based on Snell’s law and weld boundary condition, analysis of wave propagation from conventional isotropic material into anisotropic metamaterial is performed. Significance This paper can serve as a foundation for future study of massive modeling and simulation of both isotropic and anisotropic metamaterials.
关键词： Anisotropy,Snell’s law,Wave propagation,Christoffel equations,Elastic metamaterials
更新于2025-09-23 15:23:52
-
Spatial waveguide mode separation for acoustic waves in a meta-slab composed of subunits with graded thicknesses
摘要： A meta-slab composed of subunits with graded thicknesses is proposed for spatially separating the zeroth- and first-order acoustic waveguide modes according to the generalized Snell’s law. The phase velocity for the first-order mode depends on the waveguide thickness, whereas that for the zeroth-order mode does not. This enables the required phase-shift gradients of the meta-slab to be obtained for spatially separating the two waveguide modes. To design the meta-slab, analytic solutions are derived for the transmission coefficients and phase shifts of the incident acoustic waves with the two modes propagating through the subunits. Numerical simulations with transient finite-element analyses are implemented to demonstrate the propagation of the two waveguide modes. Sinusoidal signal and tone-burst excitations are applied in the analyses. The latter case shows that the two waveguide modes can be successfully separated in space by the designed meta-slab.
关键词： phase velocity,finite-element analyses,acoustic waveguide modes,meta-slab,transmission coefficients,phase shifts,generalized Snell’s law
更新于2025-09-23 15:19:57
-
[IEEE 2018 IEEE 2nd International Conference on Dielectrics (ICD) - Budapest (2018.7.1-2018.7.5)] 2018 IEEE 2nd International Conference on Dielectrics (ICD) - Macro Bending Effect in Optical Fiber Composite Low Voltage Cable
摘要： Smart Grid distribution network comprised of power supply cable as well as two way communication between the customer and grid. This two way communication is carried out by Optical fiber composite low voltage cable (OPLC). In the installation of OPLC cable, the most important factor to be taken care of is the attenuation loss occur in optical unit. In attenuation loss, macro bending is one of the major contributors. Therefore it is necessary to minimize the macro bending loss in signal attenuation while installing the OPLC cable. In this paper, we have studied the macro bending effect in optical fiber unit of optical fiber composite low voltage cable that occurs in handling and installation process of the cable. In the paper, simulation is being done by using COMSOL to measure the attenuation loss in bending the cable at the suggested radius. The experiment is carried out to analyze and investigate the attenuation loss at different bending radius and number of turns. The critical radius and suggested radius for installation have been proposed to keep the attenuation loss below 0.15 dB.
关键词： suggested radius,single mode fiber,macro bending loss,snell’s law,critical radius
更新于2025-09-11 14:15:04
-
A Liquid Pendulum Based Optical Tilt Sensor
摘要： In this paper a simple, low-cost single axis optical tilt sensor is presented. The presented sensor body is a transparent, cube shaped container made of an acrylic sheet. Additionally, it is half filled with liquid (i.e. water) based on its inner volume. In order to sense the liquid column inclination during the tilting of the sensor body, two pairs of optical trans-receiver have been used and their unique orientation across the sensor body claims relatively high measuring range. The basic working principle of the sensor depends on Snell’s law of refraction and reflection. Experimentally, it is observed that the developed prototype is able to sense the tilt angle in the range of ±90°, but a significant linear range is found in ±20°. In this range, the sensor has a resolution of 0.02° and sensitivity of 225mV/°.
关键词： optical sensor,Inclination,liquid pendulum,refraction of lights,tilt,Snell’s Law
更新于2025-09-10 09:29:36