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3 Optica Applicata

3 2001

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Verification of the correctness of thermal imaging modelling.

Dulski R., Niedziela T.

Optica Applicata

2001

Vol. 31, nr 1

193-202

Presents a method for verifying the correctness of modelling of thermal imaging of targets by means of the computer faceted thermal target model (FTTM) and the theoretical model of the thermodetection system (MTS). It is proved that the computer-produced imaging of the target model is close to the imaging of an actual target obtained by means of a scanning thermodetection system. It is demonstrated that directional temperature characteristics and directional radiative characteristics generated with the use of the FTTM model can replace efficiently actual thermograms of the target and can be applied as input data to theoretical models of thermal imaging by thermodetection systems.

Model examinations of edge effects in light-sensitive materials

Rajkowski B., Nowak P.

Optica Applicata

2001

Vol. 31, nr 1

185-191

The results of theoretical examinations of the dependence of edge effects on the optical density, which influence directly the contour sharpness in the image, are presented. Besides, the results of calculations of the influence of contrast in the characteristic curve of the radiation sensitive layer on the shape and properties of the limiting curve are shown. The results obtained are presented in the form of functions of changes in the relative edge enhancement indicator and maximum gradient of the limiting curve as dependent on the level and difference of the optical density in the image and background, respectively.

Diffraction methods of drop size measurement in polydispersive media

Opara T.A.

Optica Applicata

2001

Vol. 31, nr 1

115-141

The principles of the diffractive method of drop size determination in the aerosol stream of fuel of significant diversification of drop dimensions are presented. Three variants of data processing obtained from the light intensity distribution I(r) in the image plane are described. A comparison of both properties and applicability of the two variants is made.