Combined time and wavelength multiplexing technique of optical fiber grating sensor arrays using commercial OTDR equipment

Valente, L.C.G.; Braga, Arthur M. B.; Ribeiro, Alexandre S.; Regazzi, R.D.; Ecke, Wolfgang; Chojetzki, Christoph; Willsch, Reinhardt

doi:10.1109/jsen.2003.810106

Cited by 28 publications

(14 citation statements)

References 3 publications

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“…As interrogation system, OTDR has been utilized in different configurations. One of the most common is to use fiber Bragg grating (FBG) and/or long period grating (LPG) with OTDR [2][3][4]. Recently, it was proposed a multi-point strain measurement system based on OTDR for FBG sensors [2,3].…”

Section: Introductionmentioning

confidence: 99%

Fiber Loop Mirror Sensors Interrogated and Multiplexed by OTDR

Giraldi

Fernandes

Ferreira

et al. 2015

J. Lightwave Technol.

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In this work two techniques for interrogation and multiplexing of fiber loop mirror (FLM) intensity sensors based on Optical Time Domain Reflectometer (OTDR) are proposed. These configurations enable series and parallel FLM sensor interrogation. A fiber taper characterized as a displacement sensor was used as the intensity sensor. The OTDR parameters were optimized in order to obtain the best results. The optimized parameters were 100 ns pulse width and 10 dB input signal attenuation which permitted to attain ~18 dB dynamic range in the operating wavelength of 1550 nm. The results show a linear behavior for both configurations with similar slope, -15.3 dB/mm, in the normalized displacement range of 0.2 mm to 0.7 mm. It was also achieved a displacement resolution of 0.027 mm and 0.093 mm, for the series and parallel configurations, respectively. Sensors multiplexing are demonstrated for both configurations and the systems do not present crosstalk. Based on the experimental results, the best configuration is the parallel one. The proposed approach is a viable alternative for multiplexing and interrogation of remote fiber sensors. Index Terms-Optical fiber sensor, Fiber loop mirror, Sensor Interrogation, OTDR.The authors would like to thank CAPES (Project BEX 4463/13-7) and

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Section: Introductionmentioning

confidence: 99%

Fiber Loop Mirror Sensors Interrogated and Multiplexed by OTDR

Giraldi

Fernandes

Ferreira

et al. 2015

J. Lightwave Technol.

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“…Some works have been done to solve the mentioned problems by combining OTDR and FBGs. Although the SNR at the FBG positions is improved, it is still needed to scan the wavelength to obtain the spectra of the FBGs in these networks and most of these multiplexing systems cannot be used for distributed sensing [2,3]. Long period fiber grating (LPFG) has been used as a linear filter for spectrum demodulation of a single FBG by simply detecting the intensity information, which greatly reduces the complexity of demodulation system [4].…”

Section: Introductionmentioning

confidence: 99%

A distributed and key-position fiber sensing system based on LPFG and WFBG assisted OTDR

et al. 2014

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“…Published July 16, 2008 (projected Bragg Grating (FBG) sensors [1]- [3]. These sensing schemes appear to have difficulty in achieving optical intensity-based and real-time measurement, because the TDM technique requires a long averaging time for the stability of data acquisition and the WDM technique is used to wavelength-shift measurement of the sensors as FBGs, which need to be spectrally separated.…”

Section: Introductionmentioning

confidence: 99%

Optical Intensity-Based Measurement of Multipoint Hetero-Core Fiber Sensors by the Method of Time-Differentiation in Optical Loss

2008

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In this paper, we propose the multipoint optical intensity-based measurement of tandem connected intrinsic fiber-optic sensors by means of monitoring time-differentiation in optical loss. The use of hetero-core sensors can make it possible that a simple optical intensity-based measurement combined with a time-differentiation method could be facilitated for the multipoint measurement because the hetero-core technique has a low insertion loss and a sizable loss change in the tandem usage. Addressing multisensors has been successfully demonstrated including one displacement sensor and two contact sensors, which are located along a single transmission line in real-time basis. The gait system is also efficiently improved to monitor the knee flexure and the sole contact sensors located in a single transmission line with a mirror at the terminal end of fiber in order to simplify the measurement system for unconstrained monitoring.

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Combined time and wavelength multiplexing technique of optical fiber grating sensor arrays using commercial OTDR equipment

Cited by 28 publications

References 3 publications

Fiber Loop Mirror Sensors Interrogated and Multiplexed by OTDR

Fiber Loop Mirror Sensors Interrogated and Multiplexed by OTDR

A distributed and key-position fiber sensing system based on LPFG and WFBG assisted OTDR

Optical Intensity-Based Measurement of Multipoint Hetero-Core Fiber Sensors by the Method of Time-Differentiation in Optical Loss

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