Overlap-Proof Fiber Bragg Grating Sensing System Using Spectral Encoding

Triana, Andrés; Pastor, D.; Varón, Margarita

doi:10.1109/lpt.2015.2508743

Cited by 7 publications

(2 citation statements)

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“…In this paper, we propose the use of code division multiplexing in order to resolve optical FBG sensors. The main difference with our previous work relies in the fact that here we use magnitude and phase patterns to encode the FBG sensors while in our previous approaches [12]- [14] we were shaping the sensors only in amplitude. Still, the fundamental idea is to add another multiplexing dimension, compatible with traditional WDM schemes, increasing the number of sensors that can be deployed in the system.…”

Section: Introductionmentioning

confidence: 93%

“…Note that since such structures will be manufactured as a compound of individual FBGs, they will preserve the sensing properties of any standard FBG sensor. Indeed, we have demonstrated in previous works [12]- [14] that providing the sensors with a distinctive amplitude shape makes it possible to achieve orthogonality between them, in such a way that each sensor in the network can be unequivocally distinguished even in overlapping scenarios. It is worth noting that other sensing systems have included CDMA concepts before [15], nevertheless the encoding of this kind of systems occurs in the source, not in the shape of the sensors, so they are more likely to be classified as a variation of a TDM.…”

Section: Introductionmentioning

confidence: 99%

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Code Division Multiplexing Applied to FBG Sensing Networks: FBG Sensors Designed as Discrete Prolate Spheroidal Sequences (DPSS-FBG Sensors)

Triana

Pastor

Varón

2017

J. Lightwave Technol.

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Abstract-We propose and demonstrate a sensing system with fiber Bragg grating (FBG) sensors designed as Discrete Prolate Spheroidal Sequences (DPSS). In this way, we can encode all of the sensing devices in the network making sure that each sensor is completely distinguishable from each other even under overlapping conditions. Since these devices are complex structures involving unique magnitude and phase response, the demodulation method should be able to recover the associated magnitude and phase response in order to identify each device in the sensing network. To do so, we use a Single Side Band (SSB) modulated optical source sweeping over the operational wavelength range of the sensors, the reflected signal from the sensors is sent to a Vector Network Analyzer (VNA) in which it is obtained the magnitude and phase ratio of the network in the microwave domain. Experimental demonstration has been carried out including the manufacturing of DPSS structures. Feasibility of the interrogation technique for devices involving magnitude and phase distinction has been validated, not only to identify encoded sensors in a measurement network but also to allow overlapping between them, which allow to increase the number of sensors allocated in the sensing network.

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Section: Introductionmentioning

confidence: 93%