Mr. Chen Gao Profile

Chen Gao

at Nanjing Univ of Posts and Telecommunications

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Proceedings Article | 24 October 2014 Paper

Optically powered active sensing system for Internet Of Things

Chen Gao, Jin Wang, Long Yin, Jing Yang, Jian Jiang, Hongdan Wan

Proceedings Volume 9270, 927016 (2014) https://doi.org/10.1117/12.2071724

KEYWORDS: Sensing systems, Power supplies, Solar cells, Sensors, Active remote sensing, Internet, Active optics, Solar energy, Phase only filters, Resistance

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Internet Of Things (IOT) drives a significant increase in the extent and type of sensing technology and equipment. Sensors, instrumentation, control electronics, data logging and transmission units comprising such sensing systems will all require to be powered. Conventionally, electrical powering is supplied by batteries or/and electric power cables. The power supply by batteries usually has a limited lifetime, while the electric power cables are susceptible to electromagnetic interference. In fact, the electromagnetic interference is the key issue limiting the power supply in the strong electromagnetic radiation area and other extreme environments. The novel alternative method of power supply is power over fiber (PoF) technique. As fibers are used as power supply lines instead, the delivery of the power is inherently immune to electromagnetic radiation, and avoids cumbersome shielding of power lines. Such a safer power supply mode would be a promising candidate for applications in IOT. In this work, we built up optically powered active sensing system, supplying uninterrupted power for the remote active sensors and communication modules. Also, we proposed a novel maximum power point tracking technique for photovoltaic power convertors. In our system, the actual output efficiency greater than 40% within 1W laser power. After 1km fiber transmission and opto-electric power conversion, a stable electric power of 210mW was obtained, which is sufficient for operating an active sensing system.

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