Features of the use of LEDs in artificial-vision systems

Modeling the radiation pattern of LEDs

“…Analytical far-field approximations (single Gaussian or single cosine power) of the LED radiation pattern have been used in a wide variety of applications [13,. For example, to determine and optimize the radiation flux reaching detectors, collectors or irradiated targets from arrays of LEDs [29][30][31][32][33]. They are also used in the design of wireless communication systems [33][34][35][36], and for using LED traffic lights as transmitters [37].…”

Designing light-emitting diode arrays for uniform near-field irradiance

“…Nevertheless, in many lighting applications a uniform illumination distribution is desired, which is affected by both the packing density and the array configuration of LEDs. 3 The illumination nonhomogeneity is appreciable when the panel-target distance is not much longer than the panel size, for instance, LED systems that produce directional lighting, such as display lighting, 4,5 machine vision, 6,7 and microscopy. 8 In this paper we analyze the optimum packaging density of LED arrays, i.e., the optimum LED-to-LED spacing, to achieve uniform near-field irradiance.…”

Ray Tracing-based Simulation of Image Formation in an Equipment for Automated Optical Inspection

“…이들 요소 혹은 소자를 조합하여 AOI장비에서 사용되는 LED 배열 광원 [7] 이나 fiber illuminator 와 같은 다양한 조명 광원을 모델링 한다. 광원부에서 빛의 방출 과정을 묘사하기 위해 Lambertian 방출 분포나 가우스 방출 분포를 가정하고 [8] , 이들 확률분포 함수에 맞춰 광선의 출발점 및 방향을 무작위로 결정한다.…”