This study presents a fault detection of roller bearings through signal processing and optimization techniques. After the occurrence of scratch-type defects on the inner race of bearings, variations of kurtosis values are investigated in terms of two different data processing techniques: minimum entropy deconvolution (MED), and the Teager-Kaiser Energy Operator (TKEO). MED and the TKEO are empl...

The design of high quality factor (Q) optical cavities in two dimensional photonic crystal (PC) slab waveguides based upon a momentum space picture is presented. The results of a symmetry analysis of defect modes in hexagonal and square host photonic lattices are used to determine cavity geometries that produce modes which by their very symmetry reduce the vertical radiation loss from the PC sl...

An anisotropic photonic crystal containing two defect layers is considered. It demonstrated that the system can support a Fabry-Perot bound state in continuum (FP-BIC). A fully analytic solution of scattering problem as well condition for FP-BIC have been derived framework temporal coupled-mode theory.