Interrogation of Fiber Bragg Grating Dynamic Strain Sensors by Self-Mixing Interferometry

Suleiman, M.; Seat, Han Cheng; Bosch, Thierry

doi:10.1109/jsen.2008.926961

Cited by 26 publications

(20 citation statements)

References 29 publications

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“…[18,19] . Fig.2(a) shows Schematic diagram of the proposed experimental setup; Photograph of the experimental setup as shown in Fig.2(b).…”

Section: Advances In Engineering Research Volume 150mentioning

confidence: 99%

Extremely heart-throb measurement based on laser self-mixing interferometer

Wang¹,

Yang²,

Li³

2018

Proceedings of the 2017 4th International Conference on Machinery, Materials and Computer (MACMC 2017)

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Abstract:In this paper, A heart-throb acquisition technique based on laser self-mixing is proposed. In view of the characteristics of extremely weak vibration of human heart-throb, a multiple reflection method is proposed. The objective of the external cavity is to improve the measurement accuracy by λ / 5. Fringe counting algorithm, A periodic heart-throb is successfully reconstructed. The measurement results show that the root mean square error (RMSE) the reconstructed heartthrob was 0.813 μm at 9kHz sampling rate. In addition, correlation coefficients. And heartbeat were analyzed by this method and conventional photoelectric volume meter (PPG) measurements.

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“…[18,19] . Fig.2(a) shows Schematic diagram of the proposed experimental setup; Photograph of the experimental setup as shown in Fig.2(b).…”

Section: Advances In Engineering Research Volume 150mentioning

confidence: 99%

Extremely heart-throb measurement based on laser self-mixing interferometer

Wang¹,

Yang²,

Li³

2018

Proceedings of the 2017 4th International Conference on Machinery, Materials and Computer (MACMC 2017)

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“…Recently, work have demonstrated the feasibility of exploiting the optical feedback (OFI) or self-mixing (SM) phenomenon in a laser diode (LD) cavity as a potential interrogation technique for FBG-based devices [2][3]. Individually, OFI or SM is a non-linear compound cavity effect which has been employed in sensing applications for velocimetry, vibration and displacement measurement as well as for other parameters in free-space [4].…”

Section: Introductionmentioning

confidence: 99%

“…By its conception, the FBG can coherently back-reflect the injected laser light if both their wavelengths coincide. The early schemes reported in [2][3] required fine adjustment of the passively-operated or fixed LD wavelength to closely match the FBG peak wavelength. The wavelength requirement at the initial stages thus pertains only to an FBG sensor with a dynamic range symmetric about the FBG central wavelength and this consequently limits the dynamic range when the latter shifts away beyond the fixed LD spectrum.…”

Section: Introductionmentioning

confidence: 99%

A novel FBG interrogation method for potential structural health monitoring applications

Pham

Seat

Bernal

et al. 2011

2011 IEEE SENSORS Proceedings

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We propose an improved innovative interrogation scheme for fiber Bragg grating-based strain sensors using the optical feedback coupled into the cavity of a DFB laser diode. Strain-induced shifts of the Bragg grating peak reflectivity, which are back-reflected into the laser cavity when both the Bragg and laser wavelengths are in resonance, result in sawtooth-type fringes typical of optical feedback interference being produced. By introducing a modulation scheme to the laser drive current, the laser wavelength is scanned slowly across the extremities of the FBG spectrum, allowing the dynamic strain range to be extended by a factor of approximately half the width of the FBG spectrum. A resolution of ~6 µε is currently obtained via basic fringe counting of the detected sawtooth interference signals.

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“…The laser acts both as a light source and demodulation system in which a self-mixing effect in the laser can detect wavelength shifts induced by dynamic variations of a strained sensor [57].…”

Section: Fiber Bragg Grating Sensor Demodulation Techniquesmentioning

confidence: 99%

“…However, there are some limitations on the previous methodologies, for example, on the use of optical spectrum analyzers, although they provide high wavelength resolu-tions, its measurement response is slow and limited, it has bulk size / weight and requires frequent calibration [43,57]. The ratio-metric method in some experiments was implemented using bulk-optic filters and collimation elements, which impacts the system size and requires optical alignment [43,16].…”

Section: Fiber Bragg Grating Sensor Demodulation Techniquesmentioning

confidence: 99%

Silicon Photonic Device for Wavelength Sensing and Monitoring

López¹,

German²

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However, other fields of research such as optical sensor processing can benefit from silicon photonics technology, specially in sensors where the physical measurement is wavelength encoded.In this research work, we present a design and application of a thermally tuned silicon photonic device as an optical sensor interrogator.The main device is a micro-ring resonator filter of 10 µm of diameter. A photonic design toolkit was developed based on open source software from the research community. With those tools it was possible to estimate the resonance and spectral characteristics of the filter. From the obtained design parameters, a 7.8 x 3.8 mm optical chip was fabricated using standard micro-photonics techniques. In order to tune a ring resonance, Nichrome micro-heaters were fabricated on top of the device. Some fabricated devices were systematically characterized and their tuning response were determined. From measurements, vi a ring resonator with a free-spectral-range of 18.4 nm and with a bandwidth of 0.14 nm was obtained. Using just 5 mA it was possible to tune the device resonance up to 3 nm.In order to apply our device as a sensor interrogator in this research, a model of wavelength estimation using time interval between peaks measurement technique was developed and simulations were carried out to assess its performance. To test the technique, an experiment using a Fiber Bragg grating optical sensor was set, and estimations of the wavelength shift of this sensor due to axial strains yield an error within 22 pm compared to measurements from spectrum analyzer.Results from this study implies that signals from FBG sensors can be processed with good accuracy using a micro-ring device with the advantage of ts compact size, scalability and versatility. Additionally, the system also has additional applications such as processing optical wavelength shifts from integrated photonic sensors and to be able to track resonances from laser sources.

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Interrogation of Fiber Bragg Grating Dynamic Strain Sensors by Self-Mixing Interferometry

Cited by 26 publications

References 29 publications

Extremely heart-throb measurement based on laser self-mixing interferometer

Extremely heart-throb measurement based on laser self-mixing interferometer

A novel FBG interrogation method for potential structural health monitoring applications

Silicon Photonic Device for Wavelength Sensing and Monitoring

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