Measuring the orientation of the flexural vibrations of a cantilevered microwire with a micro-lens fiber-optic interferometer

Fu, Chenghua; Zhu, Wanli; Deng, Wen; Xu, Feng; Wang, Ning; Zou, Lvkuan; Xue, Fei

doi:10.1063/1.5021801

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…For example, accelerometers used in the detection of seismic waves are required to be sensitive to low frequencies (<100 Hz) [4] and in mechanical equipment such as rotating machinery and aero-engines, sensitive to high frequencies is required [5]. Besides the frequency factor, information on the orientation is another critical detail in vibration systems, such as cantilevered microwire [6]. Various approaches have been reported to achieve a high sensitivity and a dynamic range of frequency response.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional vector accelerometer based on Bragg gratings inscribed in a multi-core fiber

Cui¹,

Liu²,

Gunawardena³

et al. 2019

Opt. Express

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We propose and demonstrate a novel orientation-sensitive two-dimensional accelerometer based on fiber Bragg gratings inscribed in a multi-core fiber. Through monitoring of the wavelength shifts of three of the seven cores, including the central core and two outer cores which are not aligned in a straight line, information on vibration orientation as well as acceleration can be obtained simultaneously. Performance of the proposed accelerometer in terms of frequency, acceleration and vibration orientation are experimentally investigated. The designed two-dimensional accelerometer is capable of obtaining all these three parameters simultaneously. A sensitivity which is strongly dependent on the orientation is achieved, with a best orientation accuracy of 0.127° over a range of 0-180°. Moreover, the resonance frequency and the sensitivity can be optimized through adjusting the length and weight of the free-fiber. The ease of fabrication as well as the versatility of the proposed sensor makes it potentially useful in dynamic monitoring for industrial applications.

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Section: Introductionmentioning

confidence: 99%

Two-dimensional vector accelerometer based on Bragg gratings inscribed in a multi-core fiber

Cui¹,

Liu²,

Gunawardena³

et al. 2019

Opt. Express

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show abstract

“…During the past two decades, fiber-optic vibration sensors have attracted universal research interests for their distinct properties, including inherent electrical isolation, immunity to electromagnetic interference and signal multiplexing capabilities [1,2]. Orientation information is one of the most critical parameters in a vibration measurement system, especially when the vibration source is unknown, such as a cantilevered microwire [3]. Generally, multiple single-axis vibration sensors are used to determine the vibration directions, making the system complex.…”

Section: Introductionmentioning

confidence: 99%

Omnidirectional vibration sensor based on fiber Bragg gratings in a seven-core fiber

Cui¹,

Liu²,

Gunawardena³

et al. 2019

Seventh European Workshop on Optical Fibre Sensors

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We report an orientation-sensitive omnidirectional vibration sensor based on fiber Bragg gratings (FBGs) inscribed in a seven-core optical fiber. By monitoring the central wavelength shifts of three FBGs in the central core and two outer cores, orientation information in 0-180° range as well as the acceleration value are obtained. The performance of the vibration sensor is characterized at different frequencies, orientations and accelerations. Comparison results for orientation discrimination using different groups of outer cores are investigated to enhance the reliability of the vibration sensor. The experimental results demonstrate an accuracy as high as 0.01° for orientation discrimination. The compact size and simple structure make the vibration sensor potentially superior in industrial applications where precise monitoring of the orientation is a necessity.

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Determining the orientation of the flexural modes of a thermally driven microwire cantilever

Deng

Zou

et al. 2019

Journal of Applied Physics

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Mechanical resonators are excellent transducers for ultrasensitive detection applications. Recent advances such as vectorial force sensing and ultrahigh-resolution mass spectra rely on the identification of two flexural vibrational modes of a resonator. The orientations of the flexural modes with respect to the incident optical axis are crucial parameters for a cantilevered resonator. Previous methods have adopted complex experimental setups using quadrant photodetectors or have required simultaneous detection of two flexural modes of the cantilever. In this paper, we propose a method for determination of the orientations of the flexural vibrations of a cantilever using a microlens optical fiber interferometer that takes both the light interference and the lateral light scattering of the cantilever into account. We demonstrated the method by experimentally determining the orientation of the first three flexural vibrational modes of a thermally driven microwire. Our method can be used to characterize individual flexural modes with arbitrary orientations and thus provides a new tool for detecting vectorial forces.

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Measuring the orientation of the flexural vibrations of a cantilevered microwire with a micro-lens fiber-optic interferometer

Cited by 3 publications

References 26 publications

Two-dimensional vector accelerometer based on Bragg gratings inscribed in a multi-core fiber

Two-dimensional vector accelerometer based on Bragg gratings inscribed in a multi-core fiber

Omnidirectional vibration sensor based on fiber Bragg gratings in a seven-core fiber

Determining the orientation of the flexural modes of a thermally driven microwire cantilever

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