Optimized Uniform Illumination Design of Ultraviolet LED Array Module Used in Light Purification

Zhou Jing; Jiajie Fan; Wei Chen; Jie Liu; Weizi Wu; Yanjian Xiong

doi:10.3788/LOP56.192303

Laser & Optoelectronics Progress, Volume. 56, Issue 19, 192303(2019)

Optimized Uniform Illumination Design of Ultraviolet LED Array Module Used in Light Purification

Zhou Jing¹, Jiajie Fan^1,2,3、*, Wei Chen^1,2, Jie Liu¹, Weizi Wu¹, and Yanjian Xiong²

Author Affiliations

¹College of Mechanical and Electrical Engineering, Hohai University, Changzhou, Jiangsu 213022, China

²Changzhou Institute of Technology Research for Solid State Lighting, Changzhou, Jiangsu 213161, China

³Department of Microelectronics, EEMCS Faculty, Delft University of Technology, Delft 2628, the Netherlands

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Figures & Tables(18)

Fig. 1. UV light purification system structure

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Fig. 2. Structural diagram of UV LED array module. (a) 2D structure; (b) 3D structure

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Fig. 3. Luminescence intensity distribution with three illumination angles

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Fig. 4. Influence of LED array on illumination at points A and B. (a) Point A; (b) point B

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Fig. 5. Illumination of LED 1-3 at point A

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Fig. 6. Illumination of LED 1-3 at point B

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Fig. 7. Flowchart for calculating LED distance by the dichotomy method

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Fig. 8. Simulated illumination distribution of UV LED array module when the irritation angle is 120° and illumination ratio of purification layer is 0.6

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Fig. 9. Irradiance measurement setup for UV LED array module

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Fig. 10. Experimental module and measuring points. (a) Picture of UV LED array module; (b) UV irradiance measuring points

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Fig. 11. Simulated illumination distributions of UV LED array module at different distances. (a) 20 mm; (b) 40 mm; (c) 60 mm; (d) 80 mm; (e) 100 mm

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Fig. 12. Comparison of experimental and simulation results of illumination uniformity on each target surface at different distances

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Table 1. LED distances calculated by the dichotomy method

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Table 1. LED distances calculated by the dichotomy method

h /mm	2θ_1/2 /(°)	E_B/E_A	d /mm	Arrangement of LEDs(LED module size: 330 mm×330 mm)	Total number of LEDs
20	120	0.6	31.88	11×11	121
		0.75	26.32	13×13	169
		0.9	17.33	19×19	361
	90	0.6	27.41	12×12	144
	60	0.75	23.06	14×14	196
		0.9	15.77	21×21	441
		0.6	20.79	16×16	256
		0.75	18.00	18×18	324
		0.9	13.33	24×24	576

Table 2. Simulation results of normalized illumination distributions using the TracePro
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Table 2. Simulation results of normalized illumination distributions using the TracePro
E_B/E_A Normalized illumination on purificationlayer / LED emission illuminance
2θ₁_/₂ =120° 2θ₁_/₂ =90° 2θ₁_/₂ =60°
0.6 0.84 0.93 0.96
0.75 0.86 0.95 0.98
0.9 0.89 0.92 0.98

Table 3. Sample parameters of UV LED lamp bead used in this study
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Table 3. Sample parameters of UV LED lamp bead used in this study
Package size /(mm×mm) Peakwavelength /nm Power(@0.35 A) /W Opticalpower /W Thermal resistance /(℃·W^-1) Beam angle /(°)
3.5×3.5 372 1.26 0.35 6 120

Table 4. Irradiance density measurement results of target surfaces at different distances

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Table 4. Irradiance density measurement results of target surfaces at different distances

Point	Irradiance density /(10² μW·cm^-2)
	h=20 mm		h=40 mm		h=60 mm		h=80 mm		h=100 mm
	V	H	V	H	V	H	V	H	V	H
Point_-7	126.52	173.87	113.96	112.62	69.51	73.08	65.13	64.73	41.69	46.85
Point_-6	179.02	209.76	148.36	144.85	80.24	88.69	78.56	75.15	54.62	58.31
Point_-5	215.79	239.5	181.06	168.42	94.84	102.36	88.39	85.66	63.92	68.54
Point_-4	241.6	247.2	194.87	194.27	110.19	115.82	98.35	95.71	70.03	74.23
Point_-3	242.1	244.2	211.33	204.61	123.11	126.68	105.62	103.61	75.67	79.94
Point_-2	245.4	243.5	217.57	206.87	131.21	133.15	111.59	107.55	79.61	83.83
Point_-1	240.7	237.2	217.92	207.37	137.93	135.02	114.45	109.72	81.89	85.59
Point₀	232.9	230.7	214.02	202.12	139.18	134.69	114.51	108.56	82.87	85.54
Point₁	226.8	231.2	207.57	194.34	137.03	130.16	111.26	104.97	80.42	82.95
Point₂	222.1	217.9	198.69	182.14	131.48	119.56	106.07	98.02	77.53	79.30
Point₃	212.7	200.8	181.14	163.76	121.27	111.21	98.44	90.57	72.78	74.37
Point₄	207.8	184.47	165.52	146.68	108.46	99.67	88.32	79.48	66.97	65.83
Point₅	196.9	156.24	140.83	125.17	95.78	86.06	78.39	69.42	60.43	59.08
Point₆	169.02	129.14	114.52	102.40	82.83	70.02	66.20	59.16	53.83	51.57
Point₇	139.74	-	-	-	70.24	64.52	54.78	50.79	38.91	39.13
Max	245.4	247.2	217.92	207.37	139.18	135.02	114.51	109.72	82.87	85.59
Min	207.8	184.47	165.52	163.76	108.46	99.67	88.32	79.48	66.97	65.83

Table 5. Calculated results of irradiance uniformity of target surfaces at different distances
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Table 5. Calculated results of irradiance uniformity of target surfaces at different distances
Distance Uniformity /% Average uniformity /%
h=20 mm V 84.70 79.70
H 74.60
h=40 mm V 75.90 77.50
H 79.00
h=60 mm V 77.90 75.90
H 73.80
h=80 mm V 77.10 74.80
H 72.40
h=100 mm V 80.80 78.90
H 76.90

Table 6. Simulated illumination uniformity of target surfaces at different distances

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Table 6. Simulated illumination uniformity of target surfaces at different distances

Distance h /mm	Vertical uniformity	Horizontal uniformity	Average uniformity /%
20	0.71/0.91≈0.78	0.74/0.95≈0.78	78
40	0.70/0.92≈0.76	0.74/0.96≈0.77	77
60	0.66/0.90≈0.73	0.71/0.92≈0.77	75
80	0.61/0.85≈0.72	0.59/0.79≈0.75	73
100	0.64/0.86≈0.74	0.59/0.92≈0.64	69

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Zhou Jing, Jiajie Fan, Wei Chen, Jie Liu, Weizi Wu, Yanjian Xiong. Optimized Uniform Illumination Design of Ultraviolet LED Array Module Used in Light Purification[J]. Laser & Optoelectronics Progress, 2019, 56(19): 192303

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Paper Information

Category: Optical Devices

Received: Mar. 5, 2019

Accepted: Apr. 19, 2019

Published Online: Oct. 23, 2019

The Author Email: Jiajie Fan (jay.fan@connect.polyu.hk)

DOI:10.3788/LOP56.192303

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. LED distances calculated by the dichotomy method

Table 1. LED distances calculated by the dichotomy method

Table 2. Simulation results of normalized illumination distributions using the TracePro

Table 2. Simulation results of normalized illumination distributions using the TracePro

Table 3. Sample parameters of UV LED lamp bead used in this study

Table 3. Sample parameters of UV LED lamp bead used in this study

Table 4. Irradiance density measurement results of target surfaces at different distances

Table 4. Irradiance density measurement results of target surfaces at different distances

Table 5. Calculated results of irradiance uniformity of target surfaces at different distances

Table 5. Calculated results of irradiance uniformity of target surfaces at different distances

Table 6. Simulated illumination uniformity of target surfaces at different distances

Table 6. Simulated illumination uniformity of target surfaces at different distances