High-responsivity fiber-optic flexural disk accelerometers

Cranch, Geoffrey A.; Nash, Phillip J.

doi:10.1109/50.871700

Cited by 71 publications

(41 citation statements)

References 15 publications

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“…Flexural disc designs exhibit poor responsivity in small packages. Previously, as much as 75 m of SMF-28 has been used in flexural disc designs for the purpose of high responsivity [9]. Still, the flexural disc designs have operating bandwidths higher than most configurations, e.g.…”

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Theoretical and experimental demonstrations of a microfiber-based flexural disc accelerometer

et al. 2011

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The proof-of-concept demonstration of a microfiber-based flexural disc accelerometer is presented. The reduced microfiber size and bending radii give rise to high device compactness and responsivity. A flexural disc accelerometer manufactured from a 10 mm long microfiber showed a performance of ∼2:2 rad=g, with the responsivity expected to increase proportionally with the microfiber length. © 2011 Optical Society of America OCIS codes: 060.2370, 120.0280, 120.3180, 280.4788. Accelerometers . In-fiber designs are highly compact, but are limited by low responsivity. Although designs based on compliant cylinders/mandrels and weighted reflective diaphragm showed some positive attributes, notably very high sensitivity ∼10 4 rad=g [4], they also exhibit small operating bandwidth that is typically below 1 kHz. Flexural disc designs exhibit poor responsivity in small packages. Previously, as much as 75 m of SMF-28 has been used in flexural disc designs for the purpose of high responsivity [9]. Still, the flexural disc designs have operating bandwidths higher than most configurations, e.g. a few kHz. For portable applications where weight and size requirements are stringent, flexural discs face a serious design problem. In this Letter, we present a solution with a microfiberbased, centrally-supported flexural disc accelerometer that has the potential to achieve higher compactness and higher responsivity than conventional flexural discs that use telecom single-mode optical fibers or even bendinsensitive fiber (BIF). The phase-demodulation is performed by a differential technique on the intensity. Microfibers used in sensors and devices have diameters in the region of 1-3 μm, meaning that small bend radii can be achieved [12] without inducing significant polarization dependent loss and depolarization of light. Therefore, high device compactness is feasible without deterioration in expected performance. A smaller disc size also implies a higher fundamental resonance frequency, thus higher operating bandwidth. Since microfibers have reduced width, longer lengths are possible on a disc of the same size, leading to a larger response to strain and hence higher responsivity.The operating principle of the flexural disc accelerometer utilizes axial acceleration, which causes extensive strain in one fiber spiral and compressive strain in another, providing a push-pull enhancement and effectively doubles the accelerometer's response while providing common-mode rejection of pressure and temperature variations. Equations (1) and (2) are used to predict the phase (ϕ) responsivity to acceleration (A) of a centrally-supported flexural disc [9]. The stress-optic effect of microfibers are assumed to be the same as bulk silica and approximately equal to doped silica fibers [13]. Equation (1) calculates the length change due to the strain ε (expressed in terms of pressure changes ΔP due to acceleration) experienced by a ring of microfiber at radial distance r from the disc center. Equation (2) gives the sensor responsivity (rad=g) by app...

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“…Equations (1) and (2) are used to predict the phase (ϕ) responsivity to acceleration (A) of a centrally-supported flexural disc [9]. The stress-optic effect of microfibers are assumed to be the same as bulk silica and approximately equal to doped silica fibers [13].…”

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Theoretical and experimental demonstrations of a microfiber-based flexural disc accelerometer

et al. 2011

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“…Interferometric accelerometers have been fabricated by using a compliant cylinder or a central/edge-supported flexural disc to elongate optical fibers [3][4][5]. An accelerometer with a minimum detectable acceleration of 84 ng/Hz 1/2 has been achieved with 75-meter long optical fiber [4]. Fiber Bragg grating based accelerometers have attracted great interests due to the much shorter sensing element [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…To date, photonic accelerometers have been demonstrated in many different schemes to attain higher detection limit. Interferometric accelerometers have been fabricated by using a compliant cylinder or a central/edge-supported flexural disc to elongate optical fibers [3][4][5]. An accelerometer with a minimum detectable acceleration of 84 ng/Hz 1/2 has been achieved with 75-meter long optical fiber [4].…”

Section: Introductionmentioning

confidence: 99%

Compact dual-frequency fiber laser accelerometer with sub-μg resolution

et al. 2016

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Abstract:We demonstrate a compact and high-resolution dual-polarization fiber laser accelerometer. A spring-mass like scheme is constructed by fixing a 10-gram proof mass on the laser cavity to transduce applied vibration into beat-frequency change. The loading is located at the intensity maximum of intracavity light to maximize the optical response. The detection limit reaches 107 ng/Hz 1/2 at 200 Hz. The working bandwidth ranges from 60 Hz to 600 Hz.

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“…Many researches on fiber-optic flexural disk accelerometers have been reported in recent decades [7,8], while fiber laser based accelerometers have become more and more attractive on account of high resolution and small volume [9,10]. We use a short cavity distributed feedback (DFB) fiber laser as the sensing element, to construct a vector hydrophone with a diameter of 10 cm.…”

Section: Introductionmentioning

confidence: 99%

Short cavity DFB fiber laser based vector hydrophone for low frequency signal detection

Zhang

Jiang

et al. 2017

Photonic Sens

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A short cavity distributed feedback (DFB) fiber laser is used for low frequency acoustic signal detection. Three DFB fiber lasers with different central wavelengths are chained together to make three-element vector hydrophone with proper sensitivity enhancement design, which has extensive and significant applications to underwater acoustic monitoring for the national defense, oil, gas exploration, and so on. By wavelength-phase demodulation, the lasing wavelength changes under different frequency signals can be interpreted, and the sensitivity is tested about 33 dB re pm/g. The frequency response range is rather flat from 5 Hz to 300 Hz.

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High-responsivity fiber-optic flexural disk accelerometers

Cited by 71 publications

References 15 publications

Theoretical and experimental demonstrations of a microfiber-based flexural disc accelerometer

Theoretical and experimental demonstrations of a microfiber-based flexural disc accelerometer

Compact dual-frequency fiber laser accelerometer with sub-μg resolution

Short cavity DFB fiber laser based vector hydrophone for low frequency signal detection

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