Reflector (antenna)

About: Reflector (antenna) is a research topic. Over the lifetime, 28730 publications have been published within this topic receiving 212618 citations.

Scintillation detector, system and method providing energy and position information

Abstract: A radiation detector, in particular a gamma camera, is constructed and operated in such a fashion that only a predetermined number of light sensors (such as PMT's) adjoining each other in a cluster are used to generate a signal with amplitude and event position information The camera may also use an array of individual scintillation elements (crystals) in place of a single crystal, with certain advantages obtained thereby According to another aspect of the invention, there is a reflector sheet that defines an array of apertures through which scintillation light can pass from the scintillation crystal to a plurality of light sensors optically coupled to an optical window in an array corresponding to the array of apertures in the reflector

Projection Matrix Method for Shaped Beam Synthesis in Phased Arrays and Reflectors

Abstract: We present the projection matrix method for shaped beam synthesis in a general array of different size elements. The method relies on orthogonal projection of the desired far-field intensity vector onto the space spanned by the far-field intensity vectors of the array elements. It is found that for a uniform convergence of the solution, the far-field sample space must be extended beyond the coverage region; otherwise the projection matrix becomes ill conditioned. A general guideline for the far-field sample space is provided. The method, with necessary amendments, is then employed successfully for a reflector surface synthesis. The method is found to be several times faster than the gradient search method commonly used for beam synthesis. Numerical results for array and shaped reflector syntheses are shown and the advantages discussed

Variable magnification stage light

Abstract: A variable magnification "zoom" spotlight assembly is disclosed in which the diameter and focal length of the focusing lens and object lens are selected so that the angle of incidence of a light ray as it emanates from the lamp and reflector of the assembly and thereafter from the focusing and objective lenses decreases by a constant factor. This angular relationship is established by selecting the diameter and focal length of the focusing lens and objective lens and the diameter and length of the reflector according to the following angular relationship: B.sub.R /B.sub.F ≅B.sub.1 /B.sub.R ≅B.sub.2 /B.sub.1 =k Where: B F =angle of the filament to reflector as measured from the focal axis; B R =angle of gate to reflector as measured from the focal axis; B 1 =angle of focusing lens as measured from its focal length along the focal axis to its radius; B 2 =angle of objective lens as measured from its focal length along the focal axis to its radius; and, k=constant.