Abstract
To meet the simultaneous requirement of high sensitivity and high measurement range is an uphill task in the development of fiber Bragg grating (FBG) strain sensor. A unique scheme of highly sensitive FBG strain sensor is proposed based on nonlinear four wave mixing (FWM) with a high measuring range. In this paper, both the edges of FBG reflection spectrum are used without increasing the number of sources. The FWM products generated are tuned to the reflection edges of the FBG. The signals reflected from the edges of the FBG are then utilized in the subsequent FWM process to enhance the sensitivity of the system. The proposed scheme can provide a strain measurement range of 2310 με with strain sensitivity of 91.21 dBm/nm.
Highlights
Fiber Bragg Grating (FBG) sensors have been widely used for strain measurements due to its main attractive features of high sensitivity, small size, low cost, immunity to electromagnetic interference and multiplexing ability [1], [2]
A simple and unique interrogation scheme is proposed that can simultaneously achieve high sensitivity of 91.21 dBm/nm and wider range of strain measurement of 2310 μ based on higher order four wave mixing (FWM) effects. In this work both the edges of the fiber Bragg grating (FBG) reflection spectrum is used with FWM products serving as sources to interrogate the FBG
The signals reflected from the edges of the FBG are utilized in the succeeding FWM process for enhancing the sensitivity
Summary
Fiber Bragg Grating (FBG) sensors have been widely used for strain measurements due to its main attractive features of high sensitivity, small size, low cost, immunity to electromagnetic interference and multiplexing ability [1], [2]. In recent years FBG interrogation methods based on matched grating and edge filters [8]–[11] have been realized In these techniques by detecting the optical power the wavelength shift information can be obtained. A new scheme of FBG strain sensor with enhanced sensitivity based on higher order FWM effect has been proposed recently [12]. It showed a trade-off between measurement range and sensitivity achieved. A unique scheme of FBG strain sensor has been proposed to simultaneously achieve high measurement range (2310 μ ) and high sensitivity(91.21 dBm/nm). Further the signals reflected from the edges of the FBG are used in subsequent FWM process to enhance the sensitivity of the system
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