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Evaluation Model and Parameter Analysis on the ‘Cat’s Eye’ Effect of Photo-electric Equipment
Y. Zhang and W-S. Hua

Most of the optical windows of photo-electric equipment strongly reflect the incident laser beam, which is known as ‘cat’s eye’ effect. To evaluate this effect objectively, an evaluation model that called laser cross-section (LCS) to gauge the intensity of ‘cat’s eye’ effect was deduced based on the bidirectional reflectance distribution function (BRDF). And the influences of the reticule inclination angle and the defocusing amount of lens on LCS were analysed and quantitatively simulated with Matlab numerical computation method, which was in good agreement with the results by ZEMAX. It is shown that LCS trends to decrease with increasing the inclination angle of reticule and the defocusing amount, so as to enhancing the viability of photo-electric equipment on the battlefield.

Keywords: Cat’s eye effect, evaluation method, parameter analysis, laser-crosssection, bidirectional reflectance distribution function (BRDF), photo-electric equipment

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