A four-element fiber grating sensor array with phase-sensitive detection

Weis, Rüdiger; Kersey, Alan D.; Berkoff, Timothy A.

doi:10.1109/68.392208

Cited by 95 publications

(49 citation statements)

References 8 publications

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“…Hence, FBG sensor systems should be available for a complete sensing procedure including detecting and signal-processing electronics. Multiplexing and networking is one of the most effective ways to economize the system cost as mentioned above [24][25][26][27][28].…”

Section: Multiplexing and Networking Of Fbg Sensorsmentioning

confidence: 99%

Review of fiber Bragg grating sensor technology

Chen

Liu

Zeng

2011

Front. Optoelectron. China

162

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The current status of the fiber Bragg grating (FBG) sensor technology was reviewed. Owing to their salient advantages, including immunity to electromagnetic interference, lightweight, compact size, high sensitivity, large operation bandwidth, and ideal multiplexing capability, FBG sensors have attracted considerable interest in the past three decades. Among these sensing physical quantities, temperature and strain are the most widely investigated ones. In this paper, the sensing principle of FBG sensors was briefly introduced first. Then, we reviewed the status of research and applications of FBG sensors. As very important for industrial applications, multiplexing and networking of FBG sensors had been introduced briefly. Moreover, as a key technology, the wavelength interrogation methods were also reviewed carefully. Finally, we analyzed the problems encountered in engineering applications and gave a general review on the development of interrogation methods of FBG sensor.

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Section: Multiplexing and Networking Of Fbg Sensorsmentioning

confidence: 99%

Review of fiber Bragg grating sensor technology

Chen

Liu

Zeng

2011

Front. Optoelectron. China

162

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“…To achieve multipoint sensing, fiber-optic sensing elements in a sensor network need to be interrogated. Conventional fiber-optic sensor multiplexing schemes include time-division multiplexing (TDM) [17], wavelength-division multiplexing (WDM) [18], or a combination of both [19]. In a TDM scheme, pulsed light and a fast detection unit are required.…”

Section: Introductionmentioning

confidence: 99%

Cryogenic fluid level sensors multiplexed by frequency-shifted interferometry

Chen

Xü

et al. 2010

Appl. Opt.

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We present a liquid level sensing system for cryogenic fluids based on an array of aluminum-coated fiber Bragg gratings written in high-attenuation fibers (HAFs) interrogated by frequency-shifted interferometry (FSI). The sensors are heated up optically through the absorption of light at the core of the HAF sections. The distinct thermal response of sensors in the liquid from that in the gas provides an unambiguous means to detect the liquid level. FSI allows the sensors to have overlapped spectral response, and, therefore, has the potential of accommodating a larger number of sensors in the array. The measurement of liquid nitrogen level using this system was experimentally demonstrated. The successful combination of aluminum-coated HAF Bragg grating sensors and the FSI technique promises a viable solution for liquid level sensor networks at cryogenic temperatures.

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“…Theinterferometer output vs. wavelength shift is significantly influenced bythebandwidth ofthereflected light from the fiber optic Bragg grating [6]. The full width half maximum (FWHM) power of the optical spectrum for the grating used was experimentally measured to be 0.2 nm using an optical spectrum analyzer with a resolution of 0,1 nm, The error band of the spectrum analyzer gives a range of FWHM from 0.15 to 0.25 in the measurement of bandwidth.…”

Section: Nasa/tm--2001-210895mentioning

confidence: 99%

“…Interference of two optical signals with linfited coherence length results in a pattern that is influenced not only by the phase difference but also by fringe visibility [5,6,7]. The visibility function, V, limits the maximum interferometer response to wavelength shift because the increase in OPD decreases the coherence between the interferometer paths.…”

Section: Theory Of Operationmentioning

confidence: 99%