International Journal of Applied Electromagnetics and Mechanics - Volume 41, issue 4

Authors: Ghaffar, A. | Shoaib, M. | Mehmood, N. | Naz, M.Y. | Azam, M. | Naqvi, Q.A.

Article Type: Research Article

Abstract: Asymptotic ray theory (ART) or Geometrical optics approximation shows singularity in the focal region of focusing systems. Maslov's method is a technique which overcomes the defect of asymptotic ray theory (ART). In this research work, electromagnetic field expressions for a paraboloidal mirror are derived in which incident electromagnetic field is considered to be oblique. In this work polarization of the incidence wave are studied under two cases, when the field is parallel and perpendicular to the …assumed meridional plane of incidence. The procedure used to calculate the electromagnetic field in the focal region of paraboloidal mirror is Maslov's method. The numerical integration is performed for the integrals obtained by this technique in order to get information about intensity of field in focal region. Show more

Keywords: Geometrical optics, Hamilton, caustic, Maslov's method, reflector

DOI: 10.3233/JAE-121638

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 41, no. 4, pp. 479-494, 2013

Authors: Cao, Huiliang | Li, Hongsheng

Article Type: Research Article

Abstract: A novel method is investigated in this paper to estimate the temperature's influence upon the resonant frequency (RESF) and quality factor (Q) of a vacuum packaged Micro-Electro-Mechanical-System (MEMS) gyroscope, which can give suggestions to improve the architecture's temperature robustness. The dual-mass decoupled gyroscope's architecture is introduced, and the drive and sense modes' mechanical character are analyzed. The models of RESF and damping are established, and the influence factors are investigated. Four samples …are tested and the results indicate that the models can estimate and evaluate the tendency of the RESF and Q in different temperature. The investigation also considers the Young Modulus is the dominate element influencing RESF and increasing the thickness and width of the U-shaped spring can decrease this influence; Q is impacted mainly by the air viscosity coefficient and ambient pressure. The errors of the models are caused by manufacture error and the air getter's influence. Show more

Keywords: MEMS gyroscope architecture, resonant frequency, damping, temperature robustness

DOI: 10.3233/JAE-131668

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 41, no. 4, pp. 495-506, 2013

Article Type: Other

Abstract: Author Index Volume 41 (2013)

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 41, no. 4, pp. 507-511, 2013