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Abstract

The paper investigates the influence of the optical characteristics of functional coatings applied to automotive reflectors on vehicle active safety parameters, with a focus on the range and intensity of road illumination. The study examines the mathematical relationship between the maximum luminous intensity of a headlamp, the object detection distance, and the reflection coefficient (��) of an aluminium layer deposited via vacuum thermal evaporation. The main factors driving the degradation of surface reflectivity (including oxidation, thermal degradation of the base coat, and surface roughness) are analysed. It is demonstrated that a decrease in the reflection coefficient during operation directly impairs the photometric performance of the light beam in accordance with the square-root dependence. Based on analytical and experimental data, the authors substantiate the necessity of strict control over the thickness and continuity of the deposited working layer, as well as the application of protective organosilicon or interference films to stabilize the photometric characteristics of headlamps throughout the vehicle’s lifecycle.

First Page

82

Last Page

85

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