Effects of radiation patterns from ultraviolet light-emitting diodes on the uniformity of the radiation field in surface disinfection

Sen YAO; Yiqing JIANG; Lianxi ZHANG; Lianfeng ZHANG; Zhangfa TONG

doi:10.11889/j.1000-3436.2023-0096

Journal of Radiation Research and Radiation Processing, Volume. 42, Issue 2, 020802(2024)

Effects of radiation patterns from ultraviolet light-emitting diodes on the uniformity of the radiation field in surface disinfection

Sen YAO^1,2, Yiqing JIANG^2,3, Lianxi ZHANG², Lianfeng ZHANG^2、*, and Zhangfa TONG¹

Author Affiliations

¹School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China

²Laboratory of Ecology and Environmental Protection, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China

³College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China

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Figures & Tables(7)

Fig. 1. Geometric diagram of UV-LED irradiating upwards from the origin

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Fig. 2. Various UV-LED radiation patterns

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Fig. 3. Irradiance distribution of D/L=5 under the radiation of multiple UV-LEDs: (a) Diffuse patterns; (b) Specular patterns; (c) Actual patterns

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Fig. 4. Non-uniformity of the radiation field under the radiation of multiple UV-LEDs: (a) Diffuse90°; (b) Diffuse60°; (c) Diffuse45°; (d) Specular90°; (e) Specular60°; (f) Specular45°; (g) pattern 1; (h) pattern 2; (i) pattern 3

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Fig. 5. Non-uniformity of the radiation field within 80% range under the radiation of multiple UV-LEDs: (a) Diffuse patterns; (b) Specular patterns; (c) Actual patterns

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Table 1. Summary of radiation models (the calculation formulas of fluence rate)

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Table 1. Summary of radiation models (the calculation formulas of fluence rate)

模型

Radiation model

θ_{m a x} < \frac{π}{2}

θ_{m a x} = \frac{π}{2}

通用

Universal

F (θ) = F (0) f (θ)

= \frac{Ψ f (θ)}{2 π R^{2} \int_{0}^{θ_{m a x}} f (θ) s i n (θ) d θ}

F (θ) = F (0) f (θ)

= \frac{Ψ f (θ)}{2 π R^{2} \int_{0}^{\frac{π}{2}} f (θ) s i n (θ) d θ}

镜型

Specular

F (θ) = F (0)

= \frac{Ψ}{2 π R^{2} (1 - c o s (θ_{m a x}))}

F (θ) = F (0)

= \frac{Ψ}{2 π R^{2}}

发散

Diffuse

F (θ) = F (0) c o s (θ)

= \frac{2 Ψ c o s (θ)}{π R^{2} (1 - c o s (2 θ_{m a x}))}

F (θ) = F (0) c o s (θ)

= \frac{Ψ c o s (θ)}{π R^{2}}

Table 2. Fitted curve of radiation pattern "Pattern 1"

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Table 2. Fitted curve of radiation pattern "Pattern 1"

$f (θ) = a θ^{6} + b θ^{5} + c θ^{4} + d θ^{3} + e θ^{2} + f θ + g$
范围 Range	0°≤θ≤40.06°	40.06°<θ≤51.75°	51.75°<θ≤52.66°	52.66°<θ≤56.99°	56.99°<θ≤90°
a	32.303	-668 654.675	0	-90 816 590.457	0
b	-69.709	3 172 487.047	0	516 816 194.286	0
c	57.338	-6 261 161.312	0	-1 225 105 982.846	0
d	-22.500	6 579 306.217	0	1 548 418 305.657	0
e	3.784	-3 882 407.411	-43.069	-1 100 536 209.871	0
f	-0.301	1 219 820.833	77.581	417 059 957.195	0
g	0.995	-159 424.721	-33.264	-65 835 673.898	0

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Sen YAO, Yiqing JIANG, Lianxi ZHANG, Lianfeng ZHANG, Zhangfa TONG. Effects of radiation patterns from ultraviolet light-emitting diodes on the uniformity of the radiation field in surface disinfection[J]. Journal of Radiation Research and Radiation Processing, 2024, 42(2): 020802

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Paper Information

Category: Research Articles

Received: Oct. 24, 2023

Accepted: Dec. 27, 2023

Published Online: May. 28, 2024

The Author Email: Lianfeng ZHANG (张连峰)

DOI:10.11889/j.1000-3436.2023-0096

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology