Infrared thermography applied to the validation of thermal simulation of high luminance LED used in automotive front lighting

Rongier, Clément; Gilblas, Rémi; Maoult, Yannick Le; Belkessam, S.; Schmidt, Fabrice

doi:10.1016/j.infrared.2021.103980

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…Semiconductor doping also modifies the radiative properties of the active region, and as shown in the study of Welna et al [ 127 ], when free electron concentration is increased up to 10 −19 cm −3 in the n-GaN active region, shifting towards shorter wavelengths (from 7 µm to 2 µm) occurs in the infrared absorption band. One of the latest studies conducted by Rongier et al [ 128 ] thoroughly discussed these property changes for different spectral bands and opacity regions. By taking the emissivity variations into account, the authors successfully developed an in-lab IR thermography test bench that is calibrated for quantitative thermal analysis of high luminance LED front lights.…”

Section: Optical Temperature Probing Methodsmentioning

confidence: 99%

A Critical Review on the Junction Temperature Measurement of Light Emitting Diodes

2022

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In the new age of illumination, light emitting diodes (LEDs) have been proven to be the most efficient alternative to conventional light sources. Yet, in comparison to other lighting systems, LEDs operate at low temperatures while junction temperature (Tj) is is among the main factors dictating their lifespan, reliability, and performance. This indicates that accurate measurement of LED temperature is of great importance to better understand the thermal effects over a system and improve performance. Over the years, various Tj measurement techniques have been developed, and existing methods have been improved in many ways with technological and scientific advancements. Correspondingly, in order to address the governing phenomena, benefits, drawbacks, possibilities, and applications, a wide range of measurement techniques and systems are covered. This paper comprises a large number of published studies on junction temperature measurement approaches for LEDs, and a summary of the experimental parameters employed in the literature are given as a reference. In addition, some of the corrections noted in non-ideal thermal calibration processes are discussed and presented. Finally, a comparison between methods will provide the readers a better insight into the topic and direction for future research.

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Section: Optical Temperature Probing Methodsmentioning

confidence: 99%

A Critical Review on the Junction Temperature Measurement of Light Emitting Diodes

2022

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“…Heat transfer analysis can support the investigations of optical phenomena. In the literature, there are numerous thermal analyses of LED structures based on different modelling approaches, such as 3D-FEM (finite element method), analytical conjugate analyses, and compact simplified models [ 4 , 9 , 10 , 11 , 12 , 13 ]. In this research, a heat transfer analysis using compact 3D-FEM modelling was performed to validate the obtained experimental results.…”

Section: Introductionmentioning

confidence: 99%

Modelling and Thermographic Measurements of LED Optical Power

Strąkowska,

Urbaś,

Felczak

et al. 2024

Sensors

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This paper presents a simple engineering method for evaluating the optical power emitted by light-emitting diodes (LEDs) using infrared thermography. The method is based on the simultaneous measurement of the electrical power and temperature of an LED and a heat source (resistor) that are enclosed in the same plastic packaging under the same cooling conditions. This ensures the calculation of the optical power emitted by the LED regardless of the value of the heat transfer coefficient. The obtained result was confirmed by comparing it with the standard direct measurement method using an integrated sphere. The values of the estimated optical power using the proposed method and the integrated sphere equipped with a spectrometer were consistent with each other. The tested LED exhibited a high optical energy efficiency, reaching approximately η ≈ 30%. In addition, an uncertainty analysis of the obtained results was performed. Compact modelling based on a thermal resistor network (Rth) and a 3D-FEM analysis were performed to confirm the experimental results.

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Thermo-optical coupling applied to high luminance LED used in automotive front lighting

Rongier

Gilblas

Rasoldier

et al. 2023

International Journal of Thermal Sciences

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Infrared thermography applied to the validation of thermal simulation of high luminance LED used in automotive front lighting

Cited by 4 publications

References 29 publications

A Critical Review on the Junction Temperature Measurement of Light Emitting Diodes

A Critical Review on the Junction Temperature Measurement of Light Emitting Diodes

Modelling and Thermographic Measurements of LED Optical Power

Thermo-optical coupling applied to high luminance LED used in automotive front lighting

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