超低照度下的可见光物联网终端设计 
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Design of Visible Light-Based Internet of Things Terminal Under Ultralow Illumination Conditions
1 中国科学院大学微电子学院, 北京 101408
2 中国科学院大学材料与光电研究中心, 北京 100049
3 中国科学院半导体研究所集成光电子学国家重点实验室, 北京 100083
图 & 表
图 1. 朗伯光源的信道模型示意图
Fig. 1. Schematic of Lambert source channel model
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图 3. 接收器相对辐射特性曲线
Fig. 3. Relative radiation intensity of PD
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图 4. LED光谱分布曲线与接收器光谱响应曲线。(a) LED;(b)光接收器
Fig. 4. LED spectral distribution curve and receiver spectral response curve. (a) LED; (b) PD
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表 1仿真参数
Table1. Simulation parameters
| Parameter | Value |
|---|
| Operating current IF /mA | 13 | | Central luminous intensity I0 /cd | 1.36 | | Luminous half angle θ1/2/(°) | 60 | | Field of view φFOV/(°) | 90 | | Detector effective area S /mm2 | 20 | | Filter gain Gf | 1 | | Optical lens gain G0 | 4 | | Minimum irradiance at 940 nm Eemin/( W·m-2) | 0.4 | | Photosensitivity R /(A·W-1) | 0.7 |
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表 2非直视条件下不同环境亮度条件下被试人员对闪烁的感知度
Table2. 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. | |
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表 3直视条件下不同环境亮度条件下被试人员对闪烁的感知
Table3. 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. | |
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表 4系统测试结果
Table4. 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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潘天豪, 陈雄斌, 闵成彧, 孙启功, 毛旭瑞. 超低照度下的可见光物联网终端设计[J]. 光学学报, 2020, 40(7): 0706003. 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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