Evaluation Of Shielding Performance Research Articles

The Investigation of New Phosphate–Titanite Glasses According to Optical, Physical, and Shielding Properties

The melt-quenching approach was used to prepare phosphate–titanite glasses with the composition P2O5-Na2O-CaO-8KF-CaCl2-xTiO2 (where x = 2, 4, and 6) in a mol %. The optical, physical, and shielding properties, such as the mass attenuation coefficient (MAC), half-value layer (HVL), effective electron density (Neff), and effective atomic number (Zeff), of the glasses were investigated at energies ranging between 15 and 200 keV. The shielding parameters were investigated using recently developed software (MIKE). The optical properties were examined using devices such as UV-Vis-NIR spectroscopy over wavelengths ranging between 190 and 2500 nm. The reported results showed that increasing the concentration of TiO2 led to an increase in the density from 2.657 to 2.682 g/cm3 and an increase in the OPD from 66.055 to 67.262 mol/L, while the molar volume (VM) and oxygen molar volume (VO) decreased from 39.21 to 39.101 cm3/mol and from 15.139 to 14.867 cm3/mol, respectively. The energy gap was found to decrease from 3.403 to 3.279 eV when the TiO2 concentration increased. Furthermore, as the surface plasmon resonance of TiO2 increases, so does its third-order susceptibility, non-linear refractive indices, linear attenuation, and mass attenuation. The shielding performance evaluation indicates that the most suitable energy range is between 15 and 50 keV. Based on the results, the PCKNT3 glass sample exhibits the highest attenuation performance of all of the samples tested.

Electromagnetic interference shielding performance evaluation of randomised overlapping ring mesh

The authors designed a randomised overlapping ring metallic mesh and built its evaluation model of electromagnetic interference shielding effectiveness. They simulated and analysed the effects of diameter 2R and period g on electromagnetic shielding effectiveness. The simulation and experiment results show that the electromagnetic shielding effectiveness is better than 23 dB in the 10–18 GHz band while its maximum normalised high-order diffraction optical energy is decreased to 0.00134%. The randomised overlapping ring mesh can realise strong shielding effectiveness and low image-degradation simultaneously.

Correlate the structural changes to gamma radiation shielding performance evaluation for some calcium bismuth-borate glasses containing Nb2O5

Bi2O3 was replaced with Nb2O5 to improve the optical absorption of calcium bismuth borate glass. Series of five samples were prepared according to the chemical formula 60 B2O3 – x Nb2O5 - (20-x) Bi2O3 – 20 CaO, where x = 0, 2.5, 5, 7.5 and 10 mol%, where all compositions were a melted and quenched in air. The obtained glasses were characterized by density measurements, in addition to molar volume Calculations. For all the studied samples, gamma radiation shielding was carried out, using MCNPX code to investigate the mass attenuation coefficients (μ/ρ) at different photon energies. The obtained values were found in a good agreement with XCOM results. Using μ/ρ values, parameters like half-value layer (HVL) and mean free path (MFP) were evaluated. Among all the glasses, NbBi1 glass sample was found to possess the lowest values of HVL and MFP while NbBi5 sample has the highest values.

Compare Shielding Performance Evaluation of Lead Alternatives

Compare Shielding Performance Evaluation of Lead Alternatives

AUTOMATIC RECOGNITION OF METAL FIBER PER UNIT AREA FOR ELECTROMAGNETIC SHIELDING FABRIC BASED ON COMPUTER IMAGE ANALYSIS

Metal flber content is often a measured parameter for electromagnetic shielding fabric (ESF). A commonly used method is combustion measuring, but measuring speed was slow and measured fabric damaged. This study proposes a new method based on computer image analysis for recognition of metal flber content per unit area (MFCPUA) of the ESF, which aims at analyzing the MFCPUA without damage and providing a basis for the shielding performance evaluation of the ESF. Local region images of garment or fabric are obtained using high deflnition shooting system to build a gray matrix model which can describe the image. A recognition algorithm for fabric density based on gray extreme judgment is then given to construct a computation for the MFCPUA. The recognition results obtained with the proposed method is compared with the experimental results from manual combustion measuring and the error reason and the application are also analyzed. Results of experiments and analyses show that the proposed method can identify the local fabric density with lossless and accurately calculate the MFCPUA, which provide a new method for electromagnetic shielding performance evaluation of the fabric and garment by computer technique.