A fiber optic Bragg grating seismic sensor

Laudati, A.; Mennella, F.; Esposito, Marco; Cusano, A.; Giordano, M.; Breglio, G.; Sorge, S.; Tassini, C. Calisti; Torre, A. de la; D'Altrui, G.; Cutolo, A.

doi:10.1117/12.738396

Cited by 7 publications

(5 citation statements)

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“…So there is a trade-off between its measurement frequency range and sensitivity. Accelerometers with high sensitivities are important in seismic monitoring [3] and space projects [27]. The measurement frequency range can be widen a little by introducing proper damping [17,28].…”

Section: Theorymentioning

confidence: 99%

“…Fiber Bragg grating (FBG) sensors are well suited for many fields such as structural health monitoring [1,2] and seismic monitoring [3,4] because of their intrinsic advantages of frequency modulation, ease of multiplexing, and strong immunity to electromagnetic interference [5]. FBG is inherently sensitive to strain and temperature.…”

Section: Introductionmentioning

confidence: 99%

“…FBG is inherently sensitive to strain and temperature. Modulating its strain can measure acceleration [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], strain and displacement [18,19], inclination [20,21], temperature [22,23], and so on. We demonstrated that its strain is more sensitive to transverse forces than axial forces [24].…”

Section: Introductionmentioning

confidence: 99%

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Very sensitive fiber Bragg grating accelerometer using transverse forces with an easy over-range protection and low cross axial sensitivity

Chan

Yau

et al. 2013

Appl. Opt.

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The first fiber Bragg grating (FBG) accelerometer using direct transverse forces is demonstrated by fixing the FBG by its two ends and placing a transversely moving inertial object at its middle. It is very sensitive because a lightly stretched FBG is more sensitive to transverse forces than axial forces. Its resonant frequency and static sensitivity are analyzed by the classic spring-mass theory, assuming the axial force changes little. The experiments show that the theory can be modified for cases where the assumption does not hold. The resonant frequency can be modified by a linear relationship experimentally achieved, and the static sensitivity by an alternative method proposed. The principles of the over-range protection and low cross axial sensitivity are achieved by limiting the movement of the FBG and were validated experimentally. The sensitivities 1.333 and 0.634 nm/g were experimentally achieved by 5.29 and 2.83 gram inertial objects at 10 Hz from 0.1 to 0.4 g (g = 9.8 × m/s2), respectively, and their resonant frequencies were around 25 Hz. Their theoretical static sensitivities and resonant frequencies found by the modifications are 1.188 nm/g and 26.81 Hz for the 5.29 gram one and 0.784 nm/g and 29.04 Hz for the 2.83 gram one, respectively.

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Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Very sensitive fiber Bragg grating accelerometer using transverse forces with an easy over-range protection and low cross axial sensitivity

Chan

Yau

et al. 2013

Appl. Opt.

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“…1 Recently, fiber-optic accelerometers have been developed for a range of applications which include oil and gas reservoir monitoring 2 , earthquake monitoring, intruder detection 3 and machinery monitoring 4 . In order to make a small size fiber optic accelerator, fiber Bragg grating (FBG) based accelerometers have been proposed and developed [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

A compact fiber optic accelerator

Peng

et al. 2011

SPIE Proceedings

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A compact fiber optic Michelson interferometer based accelerometer is proposed and demonstrated. In this sensing system, two optical fibers have been used as the differential sensing element. By way of demodulating the different optical phase, we can obtain the acceleration which proportional to the initial force applied on the central position of the two fibers. A simple model has been built to calculate the sensitivity and resonant frequency. The experimental results show that such an accelerometer has a sensitivity of 0.42rad/g at the resonant frequency 600Hz.

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“…10,11) There are several methods for measuring acceleration using optical fibers. For example, there are methods using the Fabry-Perot interferometer, 12,13) amplitude modulators, 14) and differential optical detectors; 15) others measure the vibration of a micromachine silicon cantilever with light-density modulation using multimode fibers, 16) involve fiber Bragg gratings (FBGs), 10,11,[17][18][19][20][21][22][23] or are interferometric methods. [24][25][26][27] Among these, FBG 10,11,21) and interferometric 25) methods are primarily used for actualizing frequencies of 0.1 to several hundreds of Hz, which are necessary in earthquake observations including geophysical exploration, with a dynamic range of 100 dB.…”

Section: Introductionmentioning

confidence: 99%

Real-time displacement measurement system using phase-shifted optical pulse interferometry: Application to a seismic observation system

Yoshida¹,

Hirayama²,

Takahara³

et al. 2016

Jpn. J. Appl. Phys.

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We developed a method of detecting incident light levels on the oscillator surfaces and light pulses that include two interfering pulses with a phase shift of π/2 (phase-shifted optical pulse interferometry). This system enables the measurement of displacements greatly exceeding the half wavelength of the laser. Moreover, it allows measurements at multiple locations with a single optical fiber for using optical pulses. In this study, we conducted an interference experiment using 30 ns optical pulses and transmitted them at 1 µs intervals. We confirmed that the above two measurements are possible. Furthermore, from the data of the oscillator used for verification, we showed that measurements on the order of nanometers are possible. Since this method does not require a power supply to the oscillator, its widespread applications in physical exploration can be expected.

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A fiber optic Bragg grating seismic sensor

Cited by 7 publications

References 0 publications

Very sensitive fiber Bragg grating accelerometer using transverse forces with an easy over-range protection and low cross axial sensitivity

Very sensitive fiber Bragg grating accelerometer using transverse forces with an easy over-range protection and low cross axial sensitivity

A compact fiber optic accelerator

Real-time displacement measurement system using phase-shifted optical pulse interferometry: Application to a seismic observation system

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