What is Total Internal Reflection (TIR) Bidirectional Scattering Distribution (BSDF)?

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Total Internal Reflection (TIR) Bidirectional Scattering Distribution (BSDF)

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Table of Contents

?? ??? TIR? ??? ??? ??????
17�Թ�? TIR ??? ?? ?? ???? ??????

Definition

?? ???? ?? BSDF??? ?? ? ?? ??(TIR) ??? ?? ?? ?? (BSDF)? ? ?? ?? ?? ??? ???? ??????? ??? ??? ?? ?? ??? ?????. ??? ??? ???? ?? ??? ???? ????.

TIR BSDF? ?? ??? ? ?? ?? ??? ? ?? ?? ???? ??? ???? ?? ??? ?? ??? ??? ????. Total Internal Reflection Bidirectional Scattering Distribution Function? ??????.

Light Guide with VDI texture example modeled in LightTools | 17�Թ�

LightTools?? ??? VDI ???? ??? ? ??? (??? ???)

?? BSDF? ????? ?? ??? ????? ???. ?? ??? ? ???? ??? ???? ??? ?????.

Considering the orientation of light - examples | 17�Թ�

??? ??? ?? ??? ?? ???? ??? ? ?? ? ?? ??? ? ????. ?? ??, ????? ??? ?? ??? ??? ?? TIR BSDF ??? ???? ???.

Why is TIR important to an optical design?

?? ??? TIR (?? ???)? ??? ??? ??????

?? ?? ???? ??? ????? ??? ??? ?? ?? ??? ?????. ??? ??? ???? ??? ??? ?????? ??? ??? ?? ????, ?????? ? ??? ??? ? ????. ??? ??? ??? ??? ??? ??? ? ???? ???? ?? ?????. ??? ??? ?? ?? ?? ??? ??? ?? ???? ?? ?????? ??? ???? ???? ????.

??:

?? ???? ?? ?? ?????? ?? ??? ?? ??? ?????.
R&D ????? ??? ??? ??? ?? ??? ??? ???? ???.
?? ??? ?? ??? ???? ????? ???.

???:

??? ?? ?? BSDF (?? BSDF ? TIR BSDF)
?? ?? ? ??? TIS (???, ???, ???)

What solution does 17�Թ� offer for measuring TIR?

17�Թ�? TIR ??? ?? ?? ???? ??????

TIR? ?? ??? ?? ?? ? ????, 17�Թ�? TIR ??? ?? ? ?? ???? 17�Թ� REFLECT 180S? 17�Թ� Mini-Diff V2? ?????.

17�Թ� REFLET 180S

REFLET 180S? ??? ??? ??? BSDF ??(??? ?? ? ??)? ??? ??? ?? ??? ?? ?? ??? ?????. ??? ??? ??? ??? ??? ???? ?? ??? ??? ?? ?? ??? ???? ?????. ? ??? ??? ???? ?? ?? ?? ???? ??? ?? ??? ?????. ?? ??? ??? ???? ?? ???? ???? ??? ???? ????? ??? ??? ?????.

?? ?? 17�Թ� REFLET 180S? ???? ?? BRDF ?? BTDF ??? ?????.

??? ????? ??? ????? ???? ? ?? ?? ??? ?????.

Four measurement configurations for a sample in the 17�Թ� REFLET 180S | 17�Թ�

?? ??? VDI ?? ??? ?? 17�Թ� REFLET 180S?? ?? ??? ?????.

The following figures show results obtained from the 17�Թ� REFLET 180S for a VDI finishing surface.

Mini-Diff V2

TIR ??? LightTools Microfacet ?? ??? 17�Թ� Mini-Diff V2? ?? ???? ??? ? ????.

? ???? Mini-Diff V2? ??? ?? ??, ???? 0��? ?? BTDF? LightTools Microfacet ?? ??? ?????. ? ??? ???? ?? ???? ??? ???? ???? ??? ????.

TIR measurements can also be done using a 17�Թ� Mini-Diff V2 instrument in combination with LightTools and its Microfacet scattering model.

Mini-Diff V2? ?? ??? Excel?? ??? ? ???? LightTools? ??? Microfacet ??? ??? ? ????.

Microfacet ?? ??? ?? ???? ???? ?? ?? ??? ?????. ? ??? ???? ?? ? ????? ??? ?? ? ??? ??? ??? ??? ????? ?????. ?? ???? ?? Microfacet ??? ?? ??? ?????. ??? ???? ? ??? ?? ?? ?????? ??? ? ????.

Rough Surface Modeled with Small, Oriented Facets | 17�Թ�

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?? ?? ??? ????? ??? ?? ??? ?? ????? ???, ?? ??? ?????.

Comparing simulated and measured results | 17�Թ�

Optical Scattering Measurements & Equipment

Precision Light Scatter Data for Faster, More Cost-Effective Optical Product Development

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