An Interrogation Technique of FBG Cascade Sensors Using Wavelength to Radio-Frequency Delay Mapping

Hervás, J.; Fernández-Pousa, Carlos R.; Barrera, David; Pastor, D.; Sales, Salvador; Capmany, J.

doi:10.1109/jlt.2015.2409318

Cited by 33 publications

(16 citation statements)

References 8 publications

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“…The operational principle is based on the coherent interrogation of the sensors as a MWP filter [11]. The layout of the interrogation system is shown in Fig.1.…”

Section: Principle Of Operationmentioning

confidence: 99%

“…Novel interrogation techniques are being studied in order to overcome the main disadvantages of the conventional techniques [10,11]. The sought-after goal is to improve the resolution, sensitivity, interrogation speed, flexibility or the amount of sensors that can be interrogated in a single fiber creating this way large scale sensing networks [12,13,14].…”

mentioning

confidence: 99%

“…The usage of microwave photonics (MWP) techniques [15] is a line of research that is attracting more and more attention from the research community. Several techniques have been presented and they proved to be able to retrieve the sensing information of point [16][17][18][19], multiplexed [10,11,[20][21][22][23][24] and distributed photonic sensors [25].…”

mentioning

confidence: 99%

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Microwave Photonics Filtering Interrogation Technique Under Coherent Regime For Hot Spot Detection on a Weak FBGs Array

Hervás

Barrera

Madrigal

2018

J. Lightwave Technol.

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An interrogation technique of cascaded FBGs sensors based on a Microwave Photonics filtering technique under coherent regime is presented. The sensing information of a 5m fiber coil containing 500 weak FBGs with a similar central wavelength is retrieved. The FBGs are 9mm long and the spatial separation between consecutive FBGs is 1mm. The principle of operation is based on the calculation of the impulse response by recording the electrical frequency response of the system. Hot spot detection, location and temperature measurement are demonstrated by experimental measurements with a temperature sensitivity of 0.6dB/ºC in a 10ºC range. Fifteen measurements are recorded in order to average them to reduce noise and smooth the saw tooth appearance typical of coherent measurements. The resolution of the proposed interrogation technique is related to the bandwidth of the electrical measurement. We have obtained a resolution of 20 cm for an electrical bandwidth of 1 GHz. The SNR was larger than 16dB despite the fact that no amplification was used within the system.

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“…The operational principle is based on the coherent interrogation of the sensors as a MWP filter [11]. The layout of the interrogation system is shown in Fig.1.…”

Section: Principle Of Operationmentioning

confidence: 99%

mentioning

confidence: 99%

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Microwave Photonics Filtering Interrogation Technique Under Coherent Regime For Hot Spot Detection on a Weak FBGs Array

Hervás

Barrera

Madrigal

2018

J. Lightwave Technol.

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“…After photodetection of the samples generated by each FBG the electrical frequency response has the form [9]:…”

Section: Principle Of Operation and Simulationsmentioning

confidence: 99%

“…Cascaded weak FBGs [4] can be used to perform temperature measurements also, avoiding the fabrication problems of a continuous long weak FBG. Besides, data processing techniques like zero padding [9] or the Karhunen-Loeve transform (KLT) [10] are being studied to facilitate and improve the interrogation of such sensors.…”

Section: Introductionmentioning

confidence: 99%

FBGs cascade interrogation technique based on wavelength-to-delay mapping and KLT analysis

et al. 2016

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The Karhunen-Loeve transform is applied to the coarsely sampled impulse response generated by an FBG cascade in order to calculate the temperature change suffered by the FBGs. Thanks to a dispersive media, the wavelength change performed by the temperature change produces a delay shift in the sample generated by an FBG, delay shift which is recorded in the eigenvalues calculated by the KLT routine, letting to measure the temperature variation. Although the FBGs samples are represented only by four points, a continuous temperature measurement can be performed thanks to the KLT algorithm. This means a three order reduction in the number of points giving this method a low computational complexity. Simulations are performed to validate the interrogation technique and estimate performance and an experimental example is provided to demonstrate real operation.

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High speed and high sensitivity fiber Bragg grating interrogator based on the RF phase-shift technique

Glasser

Ofer

Abramov

et al. 2018

Optics Communications

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An Interrogation Technique of FBG Cascade Sensors Using Wavelength to Radio-Frequency Delay Mapping

Abstract: Abstract-

Cited by 33 publications

References 8 publications

Microwave Photonics Filtering Interrogation Technique Under Coherent Regime For Hot Spot Detection on a Weak FBGs Array

Microwave Photonics Filtering Interrogation Technique Under Coherent Regime For Hot Spot Detection on a Weak FBGs Array

FBGs cascade interrogation technique based on wavelength-to-delay mapping and KLT analysis

High speed and high sensitivity fiber Bragg grating interrogator based on the RF phase-shift technique

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