Design of Visible Light-Based Internet of Things Terminal Under Ultralow Illumination Conditions

Tianhao Pan; Xiongbin Chen; Chengyu Min; Qigong Sun; Xurui Mao

doi:10.3788/AOS202040.0706003

Acta Optica Sinica, Volume. 40, Issue 7, 0706003(2020)

Design of Visible Light-Based Internet of Things Terminal Under Ultralow Illumination Conditions

Tianhao Pan^1,3, Xiongbin Chen^2,3、*, Chengyu Min³, Qigong Sun^1,3, and Xurui Mao³

Author Affiliations

¹School of Micro-Electronics, University of Chinese Academy of Sciences, Beijing 101408, China

²Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

³State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

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Abstract Get PDF(in Chinese)

Figures & Tables(8)

Fig. 1. Schematic of Lambert source channel model

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Fig. 2. LED Arrays

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Fig. 3. Relative radiation intensity of PD

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Fig. 4. LED spectral distribution curve and receiver spectral response curve. (a) LED; (b) PD

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Table 1. Simulation parameters

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Table 1. Simulation parameters

Parameter	Value
Operating current I_F /mA	13
Central luminous intensity I₀ /cd	1.36
Luminous half angle θ₁_/₂/(°)	60
Field of view φ_FOV/(°)	90
Detector effective area S /mm²	20
Filter gain G_f	1
Optical lens gain G₀	4
Minimum irradiance at 940 nm E_emin/( W·m^-2)	0.4
Photosensitivity R /(A·W^-1)	0.7

Table 2. User perception of flicker in indirect viewing under different ambient light levels%
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Table 2. User perception of flicker in indirect viewing under different ambient light levels%
Modulation depth Level 1 Level 2 Level 3
1.14 90 80 0
0.46 100 100 100
0.18 100 100 100
Notes: 100% represents that none of the subjects can feel flicker; 0% represents that all subkects can feel flicker.

Table 3. User perception of flicker in direct viewing under different ambient light levels%
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Table 3. User perception of flicker in direct viewing under different ambient light levels%
Modulation depth Level 1 Level 2 Level 3
1.14 20 0 0
0.46 100 100 90
0.18 100 100 100
Notes: the same as in Table 2.

Table 4. Test results of system

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Table 4. Test results of system

Test Condition		Advance (R/W)	Retreat (R/W)	Total (R/W)	Accuracy /%
Visible light test	Robot 1	100/0	100/0	200/0	100
	Robot 2	100/0	100/0	200/0	100
IR test	Robot 1	100/0	100/0	200/0	100
	Robot 2	100/0	100/0	200/0	100
Note: The distance of horizontal visible light test with 100% accuracy is 0 m to 14.3 m; the distance of horizontal IR test with 100% accuracy is 0 m to 13.7 m; R/W represents right or wrong.

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Tianhao Pan, Xiongbin Chen, Chengyu Min, Qigong Sun, Xurui Mao. Design of Visible Light-Based Internet of Things Terminal Under Ultralow Illumination Conditions[J]. Acta Optica Sinica, 2020, 40(7): 0706003

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Paper Information

Category: Fiber Optics and Optical Communications

Received: Oct. 12, 2019

Accepted: Dec. 26, 2019

Published Online: Apr. 15, 2020

The Author Email: Chen Xiongbin (chenxiongbin@semi.ac.cn)

DOI:10.3788/AOS202040.0706003

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Simulation parameters

Table 1. Simulation parameters

Table 2. User perception of flicker in indirect viewing under different ambient light levels%

Table 2. User perception of flicker in indirect viewing under different ambient light levels%

Table 3. User perception of flicker in direct viewing under different ambient light levels%

Table 3. User perception of flicker in direct viewing under different ambient light levels%

Table 4. Test results of system

Table 4. Test results of system