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Smart Structures and Systems
  Volume 12, Number 1, July 2013, pages 23-39

Investigation of smart multifunctional optical sensor platform and its application in optical sensor networks
C. Pang, M. Yu, A.K. Gupta and K.M. Bryden

    In this article, a smart multifunctional optical system-on-a-chip (SOC) sensor platform is presented and its application for fiber Bragg grating (FBG) sensor interrogation in optical sensor networks is investigated. The smart SOC sensor platform consists of a superluminescent diode as a broadband source, a tunable microelectromechanical system (MEMS) based Fabry-Perot filter, photodetectors, and an integrated microcontroller for data acquisition, processing, and communication. Integrated with a wireless sensor network (WSN) module in a compact package, a smart optical sensor node is developed. The smart multifunctional sensor platform has the capability of interrogating different types of optical fiber sensors, including Fabry-Perot sensors and Bragg grating sensors. As a case study, the smart optical sensor platform is demonstrated to interrogate multiplexed FBG strain sensors. A time domain signal processing method is used to obtain the Bragg wavelength shift of two FBG strain sensors through sweeping the MEMS tunable Fabry-Perot filter. A tuning range of 46 nm and a tuning speed of 10 Hz are achieved. The smart optical sensor platform will open doors to many applications that require high performance optical WSNs.
Key Words
    microelectromechanical system; Fabry-Perot tunable filter; wireless optical sensor network; multiplexing fiber Bragg grating; strain measurement
C. Pang, M. Yu and A.K. Gupta : Department of Mechanical Engineering, University of Maryland, College Park, USA
K.M. Bryden: Department of Mechanical Engineering, Iowa State University, Ames, USA

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