Preparation

Muschaweck, Julius; Rehn, Henning

doi:10.1117/3.2618161.ch2

Cited by 1 publication

(3 citation statements)

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“…For example, to collimate the light from an LED into the far field, one would place the LED at the focal plane of the collimator. Or, to use an LED in Köhler illumination, 1 one would image the LED into the center of the entrance pupil of the second lens, by placing the LED at the conjugate point of the image. The virtual focus then serves as the reference point.…”

Section: Discussionmentioning

confidence: 99%

“…Which definition is correct? Ray files model the luminance/radiance distribution of a source: how much power is emitted from a small area into a small solid angle, with proper application of the cosine correction factor and the refractive index 1 . This power can be correctly represented in a ray file by many rays with little power or few rays with much power.…”

Section: Virtual Focus Definitionmentioning

confidence: 99%

“…2) and (b) model (from Ref. 1). To determine the working distance from first order optics, the designer needs the source location.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Virtual focus of a ray data source

Muschaweck¹

2023

Opt. Eng.

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.Ray data files are a common way to model light sources, such as light emitting diodes (LEDs), in optical design software. Often, when an LED shall be placed at the focal point of a collimating lens, it is desirable to know the coordinates of just a single point, which is representative of the light source location, similar to the center of mass for a distribution of matter. In some communities, this point is known as the “virtual focus,” and some LED vendors publish the virtual focus coordinates with their ray data sources. However, it is hard to find a clear and precise definition of the virtual focus, and it is not clear how it can be computed in an efficient way. We explain our definition and provide an efficient algorithm and its MATLAB® implementation.

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Section: Discussionmentioning

confidence: 99%

Section: Virtual Focus Definitionmentioning

confidence: 99%