&lt;title&gt;Multiplexing of grating-based fiber sensors using broadband spectral coding&lt;/title&gt;

Shlyagin, Mikhail G.; Miridonov, Serguei V.; Tentori, Diana; Mendieta-Jiménez, Francisco J.; Spirin, V. V.

doi:10.1117/12.339101

Cited by 12 publications

(12 citation statements)

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“…To develop the sensing system based on the frequency-division multiplexing (Figure 1), the broadband light source can have the following parameters: a central wavelength of

λ_{c} = 1532.5 nm

λ_{m i n} = 1520 nm

, and

λ_{m a x} = 1570 nm

. The low reflectivity eliminates the cross-talk noise and its value can be selected from the references [29,38]. …”

Section: Numerical Simulation and Discussionmentioning

confidence: 99%

A Theoretical Study and Numerical Simulation of a Quasi-Distributed Sensor Based on the Low-Finesse Fabry-Perot Interferometer: Frequency-Division Multiplexing

Bonilla

Rodríguez-Betancourtt

et al. 2017

Sensors

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The application of the sensor optical fibers in the areas of scientific instrumentation and industrial instrumentation is very attractive due to its numerous advantages. In the industry of civil engineering for example, quasi-distributed sensors made with optical fiber are used for reliable strain and temperature measurements. Here, a quasi-distributed sensor in the frequency domain is discussed. The sensor consists of a series of low-finesse Fabry-Perot interferometers where each Fabry-Perot interferometer acts as a local sensor. Fabry-Perot interferometers are formed by pairs of identical low reflective Bragg gratings imprinted in a single mode fiber. All interferometer sensors have different cavity length, provoking frequency-domain multiplexing. The optical signal represents the superposition of all interference patterns which can be decomposed using the Fourier transform. The frequency spectrum was analyzed and sensor’s properties were defined. Following that, a quasi-distributed sensor was numerically simulated. Our sensor simulation considers sensor properties, signal processing, noise system, and instrumentation. The numerical results show the behavior of resolution vs. signal-to-noise ratio. From our results, the Fabry-Perot sensor has high resolution and low resolution. Both resolutions are conceivable because the Fourier Domain Phase Analysis (FDPA) algorithm elaborates two evaluations of Bragg wavelength shift.

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“…To develop the sensing system based on the frequency-division multiplexing (Figure 1), the broadband light source can have the following parameters: a central wavelength of

λ_{c} = 1532.5 nm

λ_{m i n} = 1520 nm

, and

λ_{m a x} = 1570 nm

. The low reflectivity eliminates the cross-talk noise and its value can be selected from the references [29,38]. …”

Section: Numerical Simulation and Discussionmentioning

confidence: 99%

A Theoretical Study and Numerical Simulation of a Quasi-Distributed Sensor Based on the Low-Finesse Fabry-Perot Interferometer: Frequency-Division Multiplexing

Bonilla

Rodríguez-Betancourtt

et al. 2017

Sensors

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“…Thus, the proposed technique allows strain measurement free from temperature influence. It is necessary to note that double Bragg grating technique allows multiplexing of point sensors based on combination of wavelength division multiplexing (WDM) and frequency division multiplexing (FDM) principle [5]. Recently, we have demonstrate this new multiplexing method for the twin Bragg grating sensor configuration, where we use a signal processing based on the phase evaluation of the interference component in reflection spectra [6].…”

Section: Resultsmentioning

confidence: 99%

“…Fig. 5 from our previous work [5] shows composite reflection spectrum of DDBG sensor, consisting of 5 pairs of Bragg gratings with the same resonant wavelengths but different distances between gratings. Two sensors with another resonant wavelengths are used as references.…”

Section: Resultsmentioning

confidence: 99%

Differential double Bragg grating sensor for temperature-insensitive strain measurement

Spirin¹,

Shlyagin²,

Miridonov

et al. 2001

SPIE Proceedings

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A novel differential double Bragg grating sensor for temperature-insensitive strain measurement is presented. The sensor consists of two identical weak measuring and reference gratings separated by some distance. The reference grating is placed inside the silica capillary that made it almost strain insensitive. The basic idea in differential double Bragg grating sensor is to measure the energy of the oscillating term in reflection spectrum of double Bragg grating structure. The normalized energy of the interference term depends on the pitch difference of two gratings and does not change when pitch variations of both gratings are equal with temperature variation. Therefore the normalized energy of the interference term can be used for the temperature-insensitive strain measurement.

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“…A second term is cosinusoidal oscillations, a rapidly varying with wavelength AC component, whose amplitude is modulated by the grating reflectivity. Frequency of this oscillations is determined mainly by the cavity length, FP L , and plays a role of a carrier frequency in the frequency demultiplexing technique [17]. These two components can be distinguished in the frequency domain when…”

Section: Bragg Gratingsmentioning

confidence: 99%

“…Recently, we proposed a twin Bragg gratings technique [17] using a low finesse Fabry-Perot configuration. A signal processing based on a phase evaluation of the interference component in reflectance spectra [18] allows an absolute precise evaluation of measurand acting equally on both gratings in the pair and the space between them.…”

Section: Introductionmentioning

confidence: 99%

<title>Simple and potentially cost-effective demodulation technique for fiber Bragg grating sensor arrays</title>

Shlyagin¹,

Spirin²,

Miridonov

et al. 2001

SPIE Proceedings

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A new demodulation technique for fiber Bragg grating based sensors is presented. The technique makes a use of pairs of low reflectance Bragg gratings forming a low finesse Fabry-Perot local sensor. The gratings in a pair have different sensitivity to a measurand, and overlapping of their reflectance spectra depends on the external influence. Demodulation is based on measurement of the degree of the grating's spectra overlapping by means of energy of interference pattern in reflection spectrum of the interferometer. We demonstrate implementation of the proposed technique in experiments with axial strain and temperature measurements.

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<title>Multiplexing of grating-based fiber sensors using broadband spectral coding</title>

Cited by 12 publications

References 0 publications

A Theoretical Study and Numerical Simulation of a Quasi-Distributed Sensor Based on the Low-Finesse Fabry-Perot Interferometer: Frequency-Division Multiplexing

A Theoretical Study and Numerical Simulation of a Quasi-Distributed Sensor Based on the Low-Finesse Fabry-Perot Interferometer: Frequency-Division Multiplexing

Differential double Bragg grating sensor for temperature-insensitive strain measurement

<title>Simple and potentially cost-effective demodulation technique for fiber Bragg grating sensor arrays</title>

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