Abstract
Demodulation is a bottleneck for applications involving fiber Bragg gratings (FBGs). An overlap spectrum FBG sensor based on a light power demodulation method is presented in this paper. The demodulation method uses two chirp FBGs (cFBGs) of which the reflection spectra partially overlap each other. The light power variation of the overlap spectrum can be linked to changes in the measurand, and the sensor function can be realized via this relationship. A temperature experiment showed that the relationship between the overlap power spectrum of the FBG sensor and temperature had good linearity and agreed with the theoretical analysis.
Highlights
Fiber Bragg gratings (FBGs) are key passive optical components with numerous advantages including an all-fiber geometry, small size, low insertion loss, good insulation, and high flexibility [1].As a result, they have attracted considerable attention because of their wide range of applications in fiber sensors, fiber filters, fiber lasers, dispersion compensators, and other optoelectronic devices [2,3,4,5].Fiber sensors based on fiber Bragg gratings (FBGs) have high sensitivity and resolution and facilitate measurements via changes in reflection spectrum or transmitted spectrum induced by the measured entities [6]
Fiber sensors based on FBGs have high sensitivity and resolution and facilitate measurements via changes in reflection spectrum or transmitted spectrum induced by the measured entities [6]
Alternative methods based on well-known optical instruments and tools, such as Fabry-Perot filters, the Mach–Zehnder interferometer, and linear edge filters have been investigated for FBG demodulation to reduce the difficulty and the cost of applications of FBG [11,12,13,14]
Summary
Fiber Bragg gratings (FBGs) are key passive optical components with numerous advantages including an all-fiber geometry, small size, low insertion loss, good insulation, and high flexibility [1] As a result, they have attracted considerable attention because of their wide range of applications in fiber sensors, fiber filters, fiber lasers, dispersion compensators, and other optoelectronic devices [2,3,4,5]. Alternative methods based on well-known optical instruments and tools, such as Fabry-Perot filters, the Mach–Zehnder interferometer, and linear edge filters have been investigated for FBG demodulation to reduce the difficulty and the cost of applications of FBG [11,12,13,14] These methods are limited to some extent by a range of factors including low sensitivity, limited ability to adjust the measurement range, high complexity, and the utilization of devices that are not readily available [15]. Linearity, and the measurement range could be estimated and controlled
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
