The Institute of Physics ( IOP ) по журналам "Journal of Optics"
Отображаемые элементы 2140 из 872

(19910901)The introduction of image algebra has made it possible to express much of the image processing literature in a very concise form. The resulting expressions have themselves suggested many new ideas. Restoration in general ...

(19870301)A similarity coefficient to compare the images obtained by a digitizer system with coherent and incoherent light is defined. A quality prediction obtained by filtering the digitized image is applied. The influence of the ...

(19850101)A compound prism is proposed which permits the use of a wide slit in the visible and the ultraviolet spectra. If the light is inversed the compound prism acts as a monochromator.

(19880301)The authors present a synthetic formulation of the generalized LorenzMie theory. With this very general fofmulation, they can describe scattering of arbitrary incident profiles by arbitrarily located spherical scatterers. ...

(19771101)The polarization state of light transmitted by cholesteric liquid crystals when the incident vibration direction makes any angle with the director, and when p>> lambda is studied. Theoretical investigations show that figures ...

(19910301)The principle and the components of an adaptive optics system are presented. The system scaling parameters are: the Fried diameter and the average speed of the turbulence. They determine the number of actuators of the ...

(19950301)In this paper, a diagrammatic method is proposed to describe the interference phenomena of convergent polarized light and explain the formation of the black cross and the isochromatic line pattern clearly.

(19850301)A device for the determination of the polychromatic and monochromatic optical transfer function (OTF) is described. A circular aperture is incoherently illuminated and imaged by the lens to be analyzed; the image is scanned ...

(19880701)The authors study the practical possibilities of filters constructed with linear polarizers with their polarizing axis in different orientations. A filter of such characteristics placed on the Fourier plane of an optical ...

(19960501)We present an optical method for the study of ultrafast oscillating systems, by using a train of femtosecond laser pulses of continuously tunable repetition rate. We also use this technique to measure an upper limit for ...

(19901101)Presents a process to linearize formally a constrained nonlinear automatic lens design problem, which is formulated by means of the penalty function method. Also is given the solutions derived by the QR factorization method.

(19910101)For pt. I, see J. Opt. (Paris), vol.21, no.6, p.241 (1990). Presents a constrained nonlinear automatic lens design problem formulated by means of Lagrange multipliers and slack variables. The first order and the second ...

(19850501)A general approach to the noncoherent correlations is presented. This approach may be an extended version of the description for the Laur effect. It is shown that the shadowcasting correlation, the Laur effect and the ...

(19800501)A general method for pointing in any direction with the coelostat of the Meudon solar tower is presented. It is based in the solution of the complete set of equations which relates the astronomical coordinates of the ...

(19970201)The stratified cladding of integrated optical waveguides is dispersive, which induces quite original phenomena. We present an example of a dielectric waveguide for which there exists a guided mode which propagates faster ...

(19960101)In this heterodyne interferometer for measuring small displacements, an electrooptic modulator is used as a frequency shifter. It has some merits, such as, free from the mechanical vibration, simple and compact optical ...

(19980201)We demonstrate a scheme of using two types of recorded photorefractive hologram  a photovoltaic hologram and a standard photorefractive hologram  to implement an alloptical bypassexchange switch. A programmable ...

(19980601)In this paper, we present a lowfrequency optical accelerometer which may be used as a part of a monitoring system in hydroelectric power plants. The high sensitivity required by the application has been achieved by using ...

(19800301)A matrix representation of nonsymmetrical optical systems is introduced. Each component of an optical system containing spherosymmetrical lenses and cylindrical lenses rotated by arbitrary angles about the optical axis ...

(19981201)A new method for determining Brewster's angle is proposed based on the effect that the phase difference produced by a simple reflection from the test medium, for a twofrequency circularly polarized light source, is exactly ...
Отображаемые элементы 2140 из 872