Design and Analysis of a High Sensitivity FBG Accelerometer Based on Local Strain Amplification

Wang, Jun; Peng, Gang-Ding; Hu, Zhengliang; Yang, Huayong; Hu, Yongming

doi:10.1109/jsen.2014.2370640

Cited by 32 publications

(10 citation statements)

References 10 publications

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“…As a result, the resonant frequency is estimated to be 3216 Hz (η = 0.3), which is consistent with the experimental estimation (>2.5 kHz). Nevertheless, as a specification, the operational frequency can reach up to 1 kHz without any significant fluctuation in the sensitivity, which is much higher than most FBG-based accelerometers [13,20,[28][29][30], especially those capable of withstanding accelerations higher than 10 G. Since the sensing region of the fiber is pressed directly instead of being pulled by the mass, it can withstand high accelerations without any fiber breakage. The maximum acceleration applied during the experiment was ~40 G, which was limited by the shaker, however, no damage was caused to the accelerometer during the process.…”

Section: Fabrication and Principle Of The Si-based Accelerometermentioning

confidence: 99%

Novel accelerometer realized by a polarization-maintaining photonic crystal fiber for railway monitoring applications

Liu¹,

Htein²,

Gunawardena³

et al. 2019

Opt. Express

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In this paper, we present a novel accelerometer based on the Sagnac interferometer configuration using a polarization-maintaining photonic crystal fiber (PM-PCF), which has a sensitivity of ~8 pm/G, and a resonant frequency exceeding 2.5 kHz. The proposed accelerometer is capable of functioning with a constant sensitivity in a large frequency range from 0 to 1 kHz which is much wider than many FBG-based accelerometers. Experimental results obtained from a field test in railway monitoring, demonstrate a broader frequency range for the proposed accelerometer compared to that of the FBG based accelerometer and is comparable to the conventional piezoelectric sensor. The abrupt change in the acceleration measured by the sensor aids in locating any defect or crack present on the railway track. To the best of our knowledge, this is the first demonstration of an accelerometer based on a fiber interferometer aimed for the railway industry. The proposed accelerometer operating at high accelerations (>40 G) and capable of functioning at a broad frequency range, shows significant potential in being used in applications which require detection of strong and fast vibrations, especially in structural health monitoring of trains and railway tracks in real time.

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Section: Fabrication and Principle Of The Si-based Accelerometermentioning

confidence: 99%

Novel accelerometer realized by a polarization-maintaining photonic crystal fiber for railway monitoring applications

Liu¹,

Htein²,

Gunawardena³

et al. 2019

Opt. Express

View full text Add to dashboard Cite

show abstract

“…Unfortunately, all piezoelectric type accelerometers are basically a compromise between sensitivity and resonant frequency. To be specific, these two performance characteristics are fundamentally associated by a trade-off relation: namely, one property must increase at the sacrifice of the other [ 4 , 5 , 6 , 7 , 8 , 9 ]. In considering the possible presence of alternative designs of the sensor components, therefore, challenges always exist in seeking advanced sensor designs with improved performances related to these two characteristics.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical and Empirical Investigation of Design Characteristics in a Pb(Zr,Ti)O3-Based Piezoelectric Accelerometer

Lee

Han

Park

et al. 2020

Sensors

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A theoretical and experimental study on the design-to-performance characteristics of a compression-mode Pb(Zr,Ti)O3-based piezoelectric accelerometer is presented. Using the metamodeling to approximate the relationship between the design variables and the performances, the constituent components were optimized so that the generated electric voltage, representing sensitivity, could be maximized at different set values of the resonant frequency (25–40 kHz). Four kinds of optimized designs were created and fabricated into the accelerometer modules for empirical validation. The accelerometer modules fabricated according to the optimized designs were highly reliable with a broad range of resonant frequency as well as sufficiently high values of charge sensitivity. The fixed (or mounted) resonant frequency was between 16.1–30.1 kHz based on the impedance measurement. The charge sensitivity decreased from 296.8 to 79.4 pC/g with an increase of the resonant frequency, showing an inverse relation with respect to the resonant frequency. The design-dependent behaviors of the sensitivity and resonant frequency were almost identical in both numerical analysis and experimental investigation. This work shows that the piezoelectric accelerometer can be selectively prepared with best outcomes according to the requirements for the sensitivity and resonant frequency, fundamentally associated with trade-off relation.

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“…Ideal sensors for obtaining the best outcomes are sensors that offer, at the same time, a high sensitivity (low threshold) and a high resonant frequency (large frequency usable range) with a small mass (minimal mass loading on the measured object). However, all acceleration sensors are a compromise in functionalities because the main performance indicators of sensitivity and resonant frequency are inextricably linked to each other: the trade-off relation between them is well-known [7,8,9,10,11,12]. More importantly, their performance is totally influenced by the design or structural characteristics of the piezo element and constituent components.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of Bulk Piezoelectric Acceleration Sensor for Enhanced Performance

Lee

Han

Park

et al. 2019

Sensors

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While seeking to achieve high performances of a bulk piezoelectric acceleration sensor, we investigated the behavior of the design variables of the sensor components and optimized the sensor design using a numerical simulation based on piezoelectric analysis and metamodeling. The optimized results demonstrated that there was an exponential dependency in the trade-off relation between two performance indicators, the electric voltage and the resonant frequency, as induced by the design characteristics of the sensor. Among the design variables, a decrease in the base height and epoxy thickness and an increase in the piezo element’s inner diameter had a positive effect on two performances, while the head dimensions (diameter and height) exhibited the opposite effect on them. The optimal sensor designs are proposed within the valid range of resonant frequency (25–47.5 kHz). Our redesign of a commercial reference sensor improved the resonant frequency by 13.2% and the electric voltage by 46.1%.

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Design and Analysis of a High Sensitivity FBG Accelerometer Based on Local Strain Amplification

Cited by 32 publications

References 10 publications

Novel accelerometer realized by a polarization-maintaining photonic crystal fiber for railway monitoring applications

Novel accelerometer realized by a polarization-maintaining photonic crystal fiber for railway monitoring applications

A Theoretical and Empirical Investigation of Design Characteristics in a Pb(Zr,Ti)O3-Based Piezoelectric Accelerometer

Design Optimization of Bulk Piezoelectric Acceleration Sensor for Enhanced Performance

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