High-Speed Interferometric FBG Interrogator With Dynamic and Absolute Wavelength Measurement Capability

Perry, Marcus; Orr, Philip; Niewczas, Paweł; Johnston, Michael B.

doi:10.1109/jlt.2013.2276391

Cited by 25 publications

(13 citation statements)

References 12 publications

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“…If predictive monitoring for dynamically loaded structures is required, then this could be achieved by deploying high-speed measurement systems with ∼kHz interrogation rates [27]. In this work, a reasonably low interrogation rate was chosen to demonstrate that the algorithm could work without contributing further to data management problems.…”

Section: Discussionmentioning

confidence: 99%

Tipping point analysis of cracking in reinforced concrete

Perry

Livina

Niewczas³

2015

Smart Mater. Struct.

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Abstract.In this work, we demonstrate that tipping point analysis of strain data can provide reactive and predictive indicators of cracking and structural transitions in a reinforced concrete system. The method is able to detect trend-driven transitions in a short time series of approximately 2000 datapoints, providing a clear indication of when a concrete beam under gradual bending progresses from a linear to a non-linear strain response. The method is also able to provide an early warning signal of the appearance of bifurcations, such as cracks, with a forewarning of 200-500 datapoints. The method, which was originally developed for applications in geophysics, shows promising results in the area of structural health monitoring, in particular, for real-time observations of civil constructions.

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Section: Discussionmentioning

confidence: 99%

Tipping point analysis of cracking in reinforced concrete

Perry

Livina

Niewczas³

2015

Smart Mater. Struct.

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“…This, however, can be realised only when the MZI-based interrogator is stable and accurate. To improve the interrogator accuracy, more advanced system modifications have recently been proposed by the authors 9 . An initial laboratory embodiment achieves a stability of 20 pm (1.6 °C).…”

Section: Discussionmentioning

confidence: 99%

Temperature characterisation of an optically interrogated Rogowski coil

2014

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An investigation into the performance of an optically-interrogated Rogowski coil over temperatures up to 80 °C is presented. Preliminary thermal tests reveal that the sensor response is temperature-dependent and the measurement errors are increased at higher temperatures. Compensation of temperature effects is, therefore, necessary in order for the sensors to meet the requirements of protection and metering classes specified by relevant IEC standards over the considered operating temperature range. This can, however, only be achieved when the utilised sensor interrogator is adapted to ensure sufficient resolution and accuracy from a generally low-output transducer. As such, the design of a new multiplexing, interferometric interrogation platform is also proposed in this paper.

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“…Another approach for interrogation is to use passive interferometers such as Mach-Zehnder interferometers. In combination with a demultiplexing element, such as an AWG, it is possible to interrogate the photonic sensors as demonstrated in [14,15]. Despite the high sensitivity of this interrogator, special care should be taken to match the spectra of the AWG outputs to the sensors spectra.…”

Section: On-chip Interrogator Based On Fourier Transform Spectroscopymentioning

confidence: 99%

On-chip interrogator based on Fourier transform spectroscopy

Peternella¹,

Esselink²,

Dorsman³

et al. 2019

Opt. Express

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In this paper, the design and the characterization of a novel interrogator based on integrated Fourier transform (FT) spectroscopy is presented. To the best of our knowledge, this is the first integrated FT spectrometer used for the interrogation of photonic sensors. It consists of a planar spatial heterodyne spectrometer, which is implemented using an array of Mach-Zehnder interferometers (MZIs) with different optical path differences. Each MZI employs a 3×3 multi-mode interferometer, allowing the retrieval of the complex Fourier coefficients. We derive a system of non-linear equations whose solution, which is obtained numerically from Newton's method, gives the modulation of the sensor's resonances as a function of time. By taking one of the sensors as a reference, to which no external excitation is applied and its temperature is kept constant, about 92% of the thermal induced phase drift of the integrated MZIs has been compensated. The minimum modulation amplitude that is obtained experimentally is 400 fm, which is more than two orders of magnitude smaller than the FT spectrometer resolution.

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High-Speed Interferometric FBG Interrogator With Dynamic and Absolute Wavelength Measurement Capability

Cited by 25 publications

References 12 publications

Tipping point analysis of cracking in reinforced concrete

Tipping point analysis of cracking in reinforced concrete

Temperature characterisation of an optically interrogated Rogowski coil

On-chip interrogator based on Fourier transform spectroscopy

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