Surface-bonded fiber optic Sagnac sensors for ultrasound detection

Jang, Tae Seong; Lee, Seung Seok; Kim, Young Gil

doi:10.1016/j.ultras.2004.01.061

Cited by 18 publications

(6 citation statements)

References 7 publications

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“…There are many kinds of fiber-optic ultrasonic that have been researched in recent years, including fiber Bragg grating (FBG) based sensor [7], [8], fiber laser based interferometric sensor [9], [10], Sagnac interferometric sensor [11], [12], and diaphragm based Fabry-Perot interferometric sensor [13], [14] and taper based sensor [15], [16]. Among the fore-mentioned ultrasonic sensors, some are applied in the PD detection.…”

Section: Introductionmentioning

confidence: 99%

Gold-Diaphragm Based Fabry-Perot Ultrasonic Sensor for Partial Discharge Detection and Localization

Zhang

Lü

et al. 2020

IEEE Photonics J.

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Acoustic measurement is the most widely used non-electric method to detect partial discharge (PD) signals by detect the ultrasonic waves arisen from partial discharge. To solve the shortages of low sensitivity and susceptibility to interferences, a gold diaphragm based Fabry-Perot interferometer ultrasonic sensor is proposed and experimentally demonstrated. Its high acoustic sensitivity and directional insensitivity shows great capability for PD detection and localization. Experimental results illustrate a well acoustic response from 20 kHz to 150 kHz when standard ultrasonic signals applied. The frequency range covers the acoustic frequencies derived from PD process. The ultrasonic signals from a discharge source is measured by the proposed fiber optic sensor with difference distances and incident angles. The output shows an attenuation of 1.32 dB/m and the sensor can detect weak signals as far as 3 m. The directional deviation coefficients are less than 10% for each measuring distance which exhibits directional independence. Two localization techniques with a sensor array (four sensors) are proposed and simulations are carried out to verify them feasible. The fiber-optic ultrasonic sensor may have a great potential in stability maintenance of electrical power systems due to its low cost, compact structure, environmentally robustness and simple manufacturing.

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Section: Introductionmentioning

confidence: 99%

Gold-Diaphragm Based Fabry-Perot Ultrasonic Sensor for Partial Discharge Detection and Localization

Zhang

Lü

et al. 2020

IEEE Photonics J.

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“…Another way to improve the sensitivity is phase modulation of the sensor. Jang et al [25] showed that the sensitivity of surface-bonded fiber optic Sagnac AE sensors is almost twice that of noncontact-type fiber sensors. Fomitchov et al [22] also found that optimum sensitivity can be obtained if the initial phase of the optical fiber Sagnac AE sensor is π/2.…”

Section: Introductionmentioning

confidence: 99%

Influence of Initial Phase Modulation on the Sensitivity of the Optical Fiber Sagnac Acoustic Emission Sensor

et al. 2019

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Improving the phase sensitivity of the optical fiber Sagnac sensor is very important for accurately detecting weak signals of acoustic emission. Theoretical analysis shows that the initial phase of the sensor is π under ideal conditions, and the maximum phase sensitivity is obtained when the bias phase is π/2. In this work, an experimental system was built with an aluminum alloy plate as the experimental object. The initial phase of the sensor was modulated by a Y-branch waveguide, and the fitting curve of the experimental data was in good agreement with the curve of the numerical simulation. Moreover, our experiments show there was a single value for the bias phase of π/2, which significantly deviated from the theoretical value. The results show that the greatest phase sensitivity of the sensor not only could be increased by nearly nine times through modulating the initial phase, but also could suppress the harmonic interferences in the sensing system. This study can provide a useful reference for improving the phase sensitivity of the optical fiber Sagnac AE sensor in practical applications.

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“…3,4 Additionally, Q-switched ber lasers also do not require delicate adjustment and balancing of the dispersion and nonlinearity within the laser cavity as is usually the case with mode-locked ber lasers, thus giving them an added advantage. 5 These highly desirable traits have thus seen the integration of Q-switched ber lasers into a multitude of real world applications such as range nding, 6 medicine, 7 micromachining, 8 ber optic sensing 9 and telecommunications. 10 Q-switched pulses are typically generated through the use of a saturable absorber (SA), which modulates a continuous wave (CW) output into a periodic pulse train.…”

Section: Introductionmentioning

confidence: 99%

Chitosan capped nickel oxide nanoparticles as a saturable absorber in a tunable passively Q-switched erbium doped fiber laser

2018

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Surface-bonded fiber optic Sagnac sensors for ultrasound detection

Cited by 18 publications

References 7 publications

Gold-Diaphragm Based Fabry-Perot Ultrasonic Sensor for Partial Discharge Detection and Localization

Gold-Diaphragm Based Fabry-Perot Ultrasonic Sensor for Partial Discharge Detection and Localization

Influence of Initial Phase Modulation on the Sensitivity of the Optical Fiber Sagnac Acoustic Emission Sensor

Chitosan capped nickel oxide nanoparticles as a saturable absorber in a tunable passively Q-switched erbium doped fiber laser

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