Kolobrodov V.G.

Development of Calculation Methods of Diffractive Lenses

The purpose of this paper is to develop the calculation method of diffractive lenses with the given transmittance that allows determining structural parameters of diffractive lenses. To this end, we employ the example of one of the options of lenses transmittance. We show that the lens with the same parameter works as a Fresnel zone plate. In addition, we analyze the intensity distribution generated by this plate was analyzed. We show that with the increase of a focus number the focus intensity decreases, while the highest intensity is observed for the main focus.

Monochromatic Aberration of Kinoform Element

Based on the aberration model of thin lens, we obtain the monochromatic aberrations of the paraxial kinoform element with a high efficiency in the first diffraction order. We consider the dependence of field aberrations from the aperture position. Moreover, we determine the conditions, under which the kinoform element is free from some aberrations. We also study the conditions of the variation range of each field aberration minimum in the spectral range of 8–12 microns for the element with specific design parameters.

Determination of spatial resolution of the space scanner

In this paper, we propose to determine spatial resolution of the space scanner when the image contrast, formed by the objective lens–CCD-array’s system, is decreased twice. The obtained expression enables calculating spatial resolution of the space scanner. In this expression the modulation transfer function of the objective lens is represented by an experimentally obtained separate point. Furthermore, the influence of the pixel size of the CCDarray on spatial resolution of the scanner is studied.

Designing of the optical system for the thermal imager

The paper presents a method of designing of the optical system which provides set characteristics of the thermal imager. Crucially, we illustrate a sample of calculation of a FOV, a focal length, an entrance pupil diameter and the angular resolution of the objective.

The Influence of Fill-Factor by Pixels of an Infra-Red Matrix Detector on the Quality Thermal Images

The present paper deals with the modulation transfer function of the matrix detector which takes into account the sizes of a pixel, the format and the fill-factor of a matrix. Investigated here is the dependence of image contrast on the Niquist’s frequency from the fill-factor of the matrix.

An algorithm of quality enhancement of the resulting image by using exposure bracketing

Relying on multiple images formed by exposure bracketing without a prior conversion to the image with a high dynamic range (HDRI), we propose an algorithm for improving the quality of the resulting image.

The multifunction method of the object image registration with broad dynamic range of brightness

We propose the multifunction method of the object image registration. It allows matching the dynamic range of brightness of the observed objects with the dynamic range of photoregister.