Abstract
A 20-node fiber-grating-based wireless sensor network is proposed and experimentally demonstrated. Each sensor node is integrated with the light source, 1–3 FBG sensing probes, wavelength demodulation, and wireless communication module. Via self-organized clusters and low energy adaptive clustering hierarchy (LEACH) route protocols, the sensor nodes are able to exchange sensing data with the control center, and the maximum communication radius of a sensor node is over 170 m. The sensor node is battery-powered with a survival lifetime of up to 120 days at a network refresh rate of 5 minutes.
Highlights
Multi-parameter, multi-function, and distributed real-time sensing networks have been of great interests in the past decades
Speaking, owing to the different central reflection wavelengths of different fiber sensors, it would be convenient to construct a small scale fiber Bragg grating (FBG) sensor array by adopting the wavelength division multiplexing (WDM), time division multiplexing (TDM), space division multiplexing (SDM), and mixed multiplexing (WDM+TDM+SDM) technologies
Based on the advanced reduced instruction set computer (RISC) machines (ARM), digital signal processing (DSP) and field-programmable gate array (FPGA) design, we set up the hardware development platform for the fiber-grating-based wireless sensing unit to achieve the wavelength demodulation of fiber gratings, data fusion of status parameters, data storage and wireless radiation driving
Summary
Multi-parameter, multi-function, and distributed real-time sensing networks have been of great interests in the past decades. The conventional fiber grating sensing networks are no longer able to meet the demand of the large scale, distributed, and extensional network technology. Around the 1980s, the United States National Defense Senior Project Agency presented a distributed sensing network (DSN) scheme and after that accomplished the study of the sensor, communication, and data processing techniques, and the development of the distributed software [20]. Wireless sensor network technology, we proposed and demonstrated a fiber-grating-based wireless sensor network for the application of the multi-parameter sensing measurement. Our research results would be expected to pave a new way for the application of fiber grating sensors and provide new methods and approaches for the safety and health monitors under different complicated and severe circumstances, making fiber sensors with their original good features more flexible and convenient for the construction of large scale sensor networks
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