Color uniformity in spotlights optimized with reflectors and TIR lenses

Teupner, Anne; Bergenek, K.; Wirth, R.; Benı́tez, Pablo; Miñano, Juan C.

doi:10.1364/oe.23.00a118

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…Color mixing approaches are generally used by designers to fit more complex spectrum by multiple light sources. Generally, elaborately planning of the spatial position for lamps [16], [19] freeform lens [4] and light guide design [34] is widely approach to provide color mixing. One of the advantages of the proposed structure is that it simplifies the spatial position optimization process in color mixing system design, in which designers could focus more on source parameter selection and then place the sources at the focus of one or more symmetric distributed ellipsoidal reflectors.…”

Section: Color Mixingmentioning

confidence: 99%

“…For these application scenarios, nonuniformity can cause negative effects such as partial shading, glare, and measurement uncertainty. Color mixing capabilities are sometimes required to extend applications of the uniform illumination sources to provide stable or tunable light spectrum for high quality test environment [4], [5].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, Xenon arc lamps have been widely used due to high output flux and match to solar spectrum [13]- [15]. Light emitting diodes (LEDs) are now becoming good candidates of uniformity illumination systems for their low cost, high stability, high efficiency, low heat dissipation, compact size and diverse spectrum [2]- [4], [16]- [18]. Furthermore, a hybrid of multiple lamp source types is proposed to produce more complex spectrum [19].…”

Section: Introductionmentioning

confidence: 99%

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Design of Ellipsoid and Spherical Combined Light Source for Uniform Flux and Color Mixing

et al. 2019

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In this letter, an ellipsoid-spherical combined light source structure is presented for the purpose of uniform flux and color mixing, when considering heat dissipation. To allow more rays couple into spherical chamber while keeping illumination uniformity, algebraic equations to estimate light spot size focused by ellipsoidal reflector are derived and then employed to decide input slot size of the chamber. Then Monte Carlo ray tracing simulation suggests that the most preferable output slot size is between 15% and 30% of the chamber radius when considering both uniformity and available test area. A prototype with a 150-W Xenon arc lamp is fabricated to demonstrate heat distribution for the system, and experiment about uniformity indicates that 89.4% of the test circle radius can reach 2% nonuniformity. Color mixing performance for the system is studied by equipped with three ellipsoidal reflectors to collect rays from different color LEDs, and experiment shows that the maximum root-mean-square error of the spectrum across 90% of output circle radius is 1.4%. Results demonstrate it is a structure with simplified design process and having less dependence with light source type.

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Section: Color Mixingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of Ellipsoid and Spherical Combined Light Source for Uniform Flux and Color Mixing

et al. 2019

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“…When employing multi-spectral LED lighting systems for wide-spectrum illumination, light mixing devices are often used to achieve uniform illumination. For instance, spotlights based on TIR lenses and reflectors have been designed to mix RGB light sources uniformly [7]. Incorporating a free-form surface lens and a square rod can produce a light spot with uniform illumination at a distance of 250 mm [8].…”

Section: Introductionmentioning

confidence: 99%

Design of multi-spectral LED lighting system with high color uniformity for microscopic imaging

Li¹,

Dong²,

Zhang³

2023

Laser Phys.

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Multi-spectral imaging is commonly used in biomedical field to detect and recognize targets, which are in a low contrast with their background. Highly integrated multichannel light-emitting diode (LED) devices enable tuning the spectral contents of the illumination in an accurate and compact fashion, and hence make multi-spectral lighting more easily achievable even in a microscope. Besides the light source, the light mixing system is also a key to realize it. Existing light mixing devices available for multi-spectral LED lighting systems are both costly to manufacture and intricate in design, making them a challenging solution to create. This work proposes a design of multi-spectral lighting system for microscopic imaging, which can achieve a high uniformity in the effective area of illumination in terms of both the illuminance and chromaticity. Simulation results first demonstrate that the designed lighting system consisting of two rods, both containing a frosted emitting surface, managed to reduce the non-uniformity to less than 0.05 for both the illuminance and chromaticity. Experiments with a real prototype show highly uniformly illuminated microscopic images of tissue section samples. Moreover, the pathogenic fungi in the infected tissue section samples can be highlighted by the superposition of multi-spectral images. These experimental results indicate that the designed multi-spectral LED lighting system can improve the quality of microscopic imaging in terms of the illumination and image contrast.

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Design of a freeform lens array based on an adjustable Cartesian candela distribution

Lin

Cai

et al. 2019

Journal of Modern Optics

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Color uniformity in spotlights optimized with reflectors and TIR lenses

Cited by 6 publications

References 10 publications

Design of Ellipsoid and Spherical Combined Light Source for Uniform Flux and Color Mixing

Design of Ellipsoid and Spherical Combined Light Source for Uniform Flux and Color Mixing

Design of multi-spectral LED lighting system with high color uniformity for microscopic imaging

Design of a freeform lens array based on an adjustable Cartesian candela distribution

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