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1
Content available remote Verification of the correctness of thermal imaging modelling.
Dulski R., Niedziela T.
Optica Applicata
|
2001
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Vol. 31, nr 1
193-202
EN
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.
2
Content available remote Test stands for measuring the average diameter of the fuel aerosol drops by diffraction method
Opara T.A.
Optica Applicata
|
2001
|
Vol. 31, nr 1
143-164
EN
Measuring stands enabling practical implementation of the diffraction method for measuring the drop sizes of the fuel aerosol stream are presented. The construction of the diffractometer is described in which the recording of the light intensity distribution is made by scanning the image plane with a detecting system adjusted to the specificity of the image. A stand for measuring the average drop diameter in aerosols produced by fuel injectors of airplane turbine engines are presented and examples of the examination results are shown.
3
Content available remote Model examinations of edge effects in light-sensitive materials
Rajkowski B., Nowak P.
Optica Applicata
|
2001
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Vol. 31, nr 1
185-191
EN
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.
4
Content available remote Model examination of the reflex-halation in single-layer light-sensitive system
Latacz L., Nowak P.
Optica Applicata
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2001
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Vol. 31, nr 2
499-506
EN
The results of computer simulation of the effects of light scattering in a system composed of single silver halide light-sensitive layer coated on a transparent base are presented. The scattered light penetrating the base film can suffer from internal reflection from its lower surface and thus contributes to some loss of image sharpness. This effect, called reflex-halation, is very disadvantageous. The qualitative dependence of the MTF curve of the system on its geometric and optical parameters is examined. It has been shown, among others, that the deterioration of image quality is stronger for the thinner light-sensitive layer and is more elongated for the elementary scattering indicatrix of silver halide crystals. The result is similar to that obtained in the case of crossover effect, though in the presence of the antihalation layer the observed dependences are opposite to those just mentioned.
5
Content available remote Model examination of the crossover effect in two-layer light-sensitive system
Latacz L., Nowak P.
Optica Applicata
|
2001
|
Vol. 31, nr 1
177-184
EN
The results of computer simulation of the effect of light scattering in a system composed of two heterogenic light-sensitive layers coated on two sides of a transparent base are presented. It has been assumed that the modelled system is irradiated with a directed X-ray beam, while the photographic effect is caused only by the light emitted by the fluorescent screens adjacent to the light-sensitive layers and containing phosphors fluorescing due to X-ray irradiation. The scattered light transpassing the base reaches the opposite light sensitive layer, thus damaging the sharpness of the details. This effect called crossover is disadvantageous in roentgenography. The qualitative dependence of the modulation transfer function of the system on both its geometric and optical parameters was examined. It has been shown that worsening of the image is the stronger the thinner the light-sensitive layers and the weaker the light scattering by single silver halide crystals. This result is surprising since in the case of single-layer light-sensitive systems not suffering from the crossover effect opposite effects are observed.
6
Content available remote Model examination of application of fluorescent substance to silver halide light-sensitive layers
Latacz L., Nowak P.
Optica Applicata
|
2001
|
Vol. 31, nr 1
165-175
EN
The results of computer simulation of the outcomes of scattering, fluorescence and absorption of actinic light inside the hypothetical light-sensitive layer containing the silver halide crystals and fluorescent substance are presented. It has been assumed that the modelled layer is exposed exclusively to the radiation of the wavelength belonging to the intrinsic sensitivity range of silver halide. The quantitative dependence of the effective light absorption by the silver halide on the fluorescent substance concentration, the layer thickness, quantum efficiency of fluorescence and the ratio of the absorption probability of a photon of wavelength belonging to the sensitized sensitivity range and the absorption probability of a photon of the wavelength from the intrinsic sensitivity range has been examined. Also, the dependence of the modulation transfer function curve on the above parameters has been studied. The results obtained indicate that under some circumstances an addition of fluorescent substance can enhance the photosensitivity of the layer and improve simultaneously the sharpness of the recorded image.
7
Content available remote Diffraction methods of drop size measurement in polydispersive media
Opara T.A.
Optica Applicata
|
2001
|
Vol. 31, nr 1
115-141
EN
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.
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