Fiber Bragg grating microphone system

Mohanty, Lipi; Koh, Liang Mong; Tjin, Swee Chuan

doi:10.1063/1.2363977

Cited by 36 publications

(14 citation statements)

References 8 publications

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“…Traditional architectures of FBG microphones [3], however, lead to overwhelmingly expensive systems, and are not of interest for practical CBM application. Following an approach that combines cheap fiber optics components with signal processing, previously reported in [4], the authors have developed an ad-hoc architecture for a multiplexed FBG sensing network with multi-step signal processing that increases the operative signal-to-noise ratio by 59 dB.…”

Section: Introductionmentioning

confidence: 98%

Fiber Bragg grating microphone system for condition-based maintenance of industrial facilities

Tosi¹,

Olivero²,

Perrone³

et al. 2011

SPIE Proceedings

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This paper presents a multipoint fiber Bragg grating (FBG) sensing system operating as a precision microphone. This instrument aims to become the best performing technology for condition-based maintenance (CBM) of critical elements, like ball bearings and cogwheels, embedded in industrial manufacturing machineries. The system architecture is based on the simple matched-laser principle, leading to a low-cost and high-sensitivity system, operating in time and wavelength multiplexing mode. Then, heavy signal processing is applied, providing an outstanding performance improvement of 59 dB in terms of signal-to-noise ratio. A demonstration of condition-based maintenance operation has been performed using standard models of ball bearing sound spectra. Compared to traditional microphones applied to CBM, the signal processing-powered FBG system provides remarkable advantages in terms of sensitivity and rejection of environment noise, providing an improvement of cost-effectiveness of CBM.

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Section: Introductionmentioning

confidence: 98%

Fiber Bragg grating microphone system for condition-based maintenance of industrial facilities

Tosi¹,

Olivero²,

Perrone³

et al. 2011

SPIE Proceedings

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“…Each FBG is sensitive to strain and temperature, exhibiting a linear sensitivity over a wide sensing range [2]. FBG strain sensors are employed in structural health monitoring [6,7], avionics [8,9], vibration sensing [10][11][12][13], and seismic applications [14,15]; FBGs are also often embedded into composite materials [6]. Miniature FBG sensors are often employed in medicine for temperature [16,17] and strain sensing [18][19][20] and in harsh environments such as nuclear plants [21,22].…”

Section: Introductionmentioning

confidence: 99%

Improved KLT Algorithm for High-Precision Wavelength Tracking of Optical Fiber Bragg Grating Sensors

Tosi¹

2017

Journal of Sensors

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Fiber Bragg Gratings (FBGs) are among the most popular optical fiber sensors. FBGs are well suited for direct detection of temperature and strain and can be functionalized for pressure, humidity, and refractive index sensing. Commercial setups for FBG interrogation are based on white-light sources and spectrometer detectors, which are capable of decoding the spectrum of an FBG array. Low-cost spectrometers record the spectrum on a coarse wavelength grid (typically 78–156 pm), whereas wavelength shifts of 1 pm or lower are required by most of the applications. Several algorithms have been presented for detection of small wavelength shift, even with coarse wavelength sampling; most notably, the Karhunen-Loeve Transform (KLT) was demonstrated. In this paper, an improved algorithm based on KLT is proposed, which is capable of further expanding the performances. Simulations show that, reproducing a commercial spectrometer with 156 pm grid, the algorithm estimates wavelength shift with accuracy well below 1 pm. In typical signal-to-noise ratio (SNR) conditions, the root mean square error is 22–220 fm, while the accuracy is 0.22 pm, despite the coarse sampling. Results have been also validated through experimental characterization. The proposed method allows achieving exceptional accuracy in wavelength tracking, beating the picometer level resolution proposed in most commercial and research software, and, due to fast operation (>5 kHz), is compatible also with structural health monitoring and acoustics.

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“…This means that the FOM can work in some difficult measurement environments such as inside magnetic resonance medical imaging equipment and in other industrial applications subject to high electromagnetic fields. A number of different optical fiber microphone schemes have been reported, employing a fiber Bragg grating [1, 2], reflective membrane [3], fiber DFB laser [4], and an interferometer [5, 6]. However by comparison to a conventional microphone, the cost of available FOMs is not competitive since the sensing schemes often require expensive sensor components and complex demodulation systems to achieve a high sensitivity to the weak acoustic pressure.…”

Section: Introductionmentioning

confidence: 99%

A novel highly sensitive optical fiber microphone based on single mode–multimode–single mode structure

An¹,

Semenova²,

Farrell³

2010

Micro & Optical Tech Letters

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In this article, a novel multimode interference based optical fiber microphone by employing single mode‐multimode‐single mode (SMS) structure is presented. The acoustic vibration is measured by detecting the transmission loss of the SMS structure that attached to a thick aluminum membrane. Experiments are carried on to test the performance of SMS structured fiber microphone, and the experimental results show that the SMS fiber sensor can effectively detect the acoustic signal within the audio range of 20 kHz. It also exhibits a high sensitivity and human voice can also be picked up effectively within the distance of 2 m. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:442–445, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25688

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Fiber Bragg grating microphone system

Cited by 36 publications

References 8 publications

Fiber Bragg grating microphone system for condition-based maintenance of industrial facilities

Fiber Bragg grating microphone system for condition-based maintenance of industrial facilities

Improved KLT Algorithm for High-Precision Wavelength Tracking of Optical Fiber Bragg Grating Sensors

A novel highly sensitive optical fiber microphone based on single mode–multimode–single mode structure

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