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

Journals >Acta Optica Sinica >Volume 40 >Issue 7 >Page 0706003 > Article

Acta Optica Sinica
Vol. 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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DOI: 10.3788/AOS202040.0706003 Cite this Article Set citation alerts

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 Copy Citation Text

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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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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 1. Simulation parameters

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

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.

Table 4. Test results of system

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