Ground vibrations detection with fiber optic sensor

Liang, Tsair–Chun; Lin, Yung-Li

doi:10.1016/j.optcom.2012.01.037

Cited by 46 publications

(19 citation statements)

References 23 publications

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“…Recently, fiber-optic vibration (or, equivalently, acceleration) sensors have received more attention than their electrical counterparts because of their inherent superiority, as described above [84,85,86,87,88,89,90,91,92,93,94,95,96]. In particular, FBG accelerometers have undergone rapid development and have established themselves as the leading technology, compared to other fiber sensor technologies.…”

Section: Functional Fbg Sensorsmentioning

confidence: 99%

Fiber Bragg Grating Sensors for the Oil Industry

Qiao

Shao

Bao

et al. 2017

Sensors

174

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With the oil and gas industry growing rapidly, increasing the yield and profit require advances in technology for cost-effective production in key areas of reservoir exploration and in oil-well production-management. In this paper we review our group’s research into fiber Bragg gratings (FBGs) and their applications in the oil industry, especially in the well-logging field. FBG sensors used for seismic exploration in the oil and gas industry need to be capable of measuring multiple physical parameters such as temperature, pressure, and acoustic waves in a hostile environment. This application requires that the FBG sensors display high sensitivity over the broad vibration frequency range of 5 Hz to 2.5 kHz, which contains the important geological information. We report the incorporation of mechanical transducers in the FBG sensors to enable enhance the sensors’ amplitude and frequency response. Whenever the FBG sensors are working within a well, they must withstand high temperatures and high pressures, up to 175 °C and 40 Mpa or more. We use femtosecond laser side-illumination to ensure that the FBGs themselves have the high temperature resistance up to 1100 °C. Using FBG sensors combined with suitable metal transducers, we have experimentally realized high- temperature and pressure measurements up to 400 °C and 100 Mpa. We introduce a novel technology of ultrasonic imaging of seismic physical models using FBG sensors, which is superior to conventional seismic exploration methods. Compared with piezoelectric transducers, FBG ultrasonic sensors demonstrate superior sensitivity, more compact structure, improved spatial resolution, high stability and immunity to electromagnetic interference (EMI). In the last section, we present a case study of a well-logging field to demonstrate the utility of FBG sensors in the oil and gas industry.

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Section: Functional Fbg Sensorsmentioning

confidence: 99%

Fiber Bragg Grating Sensors for the Oil Industry

Qiao

Shao

Bao

et al. 2017

Sensors

174

View full text Add to dashboard Cite

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“…Although x w , y w , and m are not intuitionistic, they can be expressed as Eqs. (10)(11)(12), respectively,…”

Section: Mathematical Model and Calculationsmentioning

confidence: 99%

“…Compared with traditional sensors, FBG sensors have their intrinsic advantages such as immunity to electromagnetic radiation, resistance to chemical corrosion, small size, high accuracy, remote operation capability [3][4][5], low noise, and multiplexing capabilities. These characteristics promote the application of FBG accelerometers in remote online monitoring and measurement in harsh environments [6][7][8]: for instance, in earthquakes, debris flow, oil and gas, wind energy, coal mines, and even nuclear explosions [9][10][11]. In recent years, great progress has been made in the design of FBG-based accelerometers, such as embedded-type and cantileverbased, with a typical L-shaped [12][13][14] accelerometer based on a diaphragm [15,16].…”

Section: Introductionmentioning

confidence: 99%

Medium-high frequency FBG accelerometer with integrative matrix structure

et al. 2015

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To meet the requirements for medium-high frequency vibration monitoring, a new type fiber Bragg grating (FBG) accelerometer with an integrative matrix structure is proposed. Two symmetrical flexible gemels are used as elastic elements, which drive respective inertial mass moving reversely when exciting vibration exists, leading to doubling the wavelength shift of the FBG. The mechanics model and a numerical method are presented in this paper, by which the influence of the structural parameters on the sensitivity and eigenfrequency is discussed. Sensitivity higher than 200 pm/g and an eigenfrequency larger than 3000 Hz can be realized separately, but both cannot be achieved simultaneously. Aiming for a broader measuring frequency range, a prototype accelerometer with an eigenfrequency near 3000 Hz is designed, and results from a shake table test are also demonstrated.

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“…Not only silica optical fiber sensors but also polymer optical fibers (POF) sensors are widely used in different sensing applications. Several fiber sensor designs based on FBG have been reported for various applications, such as liquid level monitoring [13], transverse force sensing [14], concentration measurement [15], biomedical measurement [16,17], pressure [18][19][20], displacement [21,22], temperature [23,24], and ground vibration [25]. An FBG is a type of distributed Bragg reflector constructed in a short segment of optical fiber that reflects particular wavelengths of light and transmits all others.…”

Section: Introductionmentioning

confidence: 99%

Design and Testing of a 2D Optical Fiber Sensor for Building Tilt Monitoring Based on Fiber Bragg Gratings

Chao

Liang

2017

ASI

Self Cite

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Abstract:In this paper, a new type of optical fiber tilt sensor based on fiber Bragg grating (FBG) is presented for 2D dual-axis tilt angle sensing. The tilt sensor is composed of two cylindrical floats suspended in water, connected with FBG. When the external environment causes the tilting of the sensor, the surface of the liquid within the container will form a new balanced liquid surface plane due to the gravity and change the height of the liquid at different locations in the container. So the buoyancy force of the cylindrical floats of the sensor will vary with the depth of liquid, thus the changed FBG strain will cause the FBG reflection central wavelength shift. According to the measured central wavelength shift by the optical spectral analyzer (OSA), we can obtain the two-axis tilt angle of the sensor. The proposed sensor can detect a tilt angle range of −5 degrees to +5 degrees and achieve a sensitivity of 0.1 • with optical spectrum analyzer resolution of 0.01 nm. Due to its good sensing linearity, the proposed sensor can be applied in building tilt measurement.

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Ground vibrations detection with fiber optic sensor

Cited by 46 publications

References 23 publications

Fiber Bragg Grating Sensors for the Oil Industry

Fiber Bragg Grating Sensors for the Oil Industry

Medium-high frequency FBG accelerometer with integrative matrix structure

Design and Testing of a 2D Optical Fiber Sensor for Building Tilt Monitoring Based on Fiber Bragg Gratings

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