Thermal Analysis of High-Power LED Lens

Dandan Xu¹ and Xuegong Hu^1、2、*

Author Affiliations

¹Research Center for Heat and Mass Transfer, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China

²University of Chinese Academy of Sciences, Beijing 100049, China

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DOI: 10.3788/AOS201939.1023001 Cite this Article Set citation alerts

Dandan Xu, Xuegong Hu. Thermal Analysis of High-Power LED Lens[J]. Acta Optica Sinica, 2019, 39(10): 1023001 Copy Citation Text

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Fig. 1. Physical model of LED. (a) Exterior photograph of LED; (b) interior structure model of lens

Fig. 2. Optical experimental device

Fig. 3. Comparison between experimental and calculation results (a) and thermal infrared images (b)

Fig. 4. Variation of surface temperature of lens with x. (a) Inner surface; (b) external surface

Fig. 5. Variation of surface temperature of lens with t. (a) Inner surface; (b) external surface

Fig. 6. Variation of central temperature of lens inner surface with ε

Fig. 7. Variation of thermal stress of lens with x

Fig. 8. Variation of total displacement of lens with x

Fig. 9. Variations of maximum thermal stress and maximum total displacement with α

Material	Density ρ /(kg·m^-3)	Thermal conductivity λ /(W·m^-1·K^-1)	Capacity ${c_{p}}_{}$ /(J·kg^-1·K^-1)	Young’s modulus E /GPa	Poisson’s ratio	Coefficient of thermal expansion /(10^-6 K^-1)
High borosilicate glass	2203	1.38	703	73.1	0.17	3.3
Aluminium	2700	201	900	69	0.33	23.4
Gallium nitride	6150	130	483	210	0.17	7.75
Thermal grease	2810	2.5	705	/	/	/
Air	1205	0.026	1005	/	/	/

Table 1. Material parameters used in calculation

Dandan Xu, Xuegong Hu. Thermal Analysis of High-Power LED Lens[J]. Acta Optica Sinica, 2019, 39(10): 1023001

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