Dynamic characteristics of moving-coil geophone with large damping

Zhang, G.H; Hu, Songyan

doi:10.3233/jae-2010-1159

Cited by 22 publications

(7 citation statements)

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“…These all have high requirements for the low-frequency performances of seismometers [ 1 , 2 , 3 , 4 , 5 ]. However, conventional seismometers based on moving-coils, optic-fibers, and piezoelectrics cannot effectively address these requirements due to poor low-frequency characteristics [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. Meanwhile, electrochemical seismometers that have appeared in recent years use electrolytes as inertial masses and are featured with large working angles, high sensitivities, low noise levels, and excellent low-frequency performances.…”

Section: Introductionmentioning

confidence: 99%

MEMS-Based Electrochemical Seismometer Relying on a CAC Integrated Three-Electrode Structure

She

Wang

Chen

et al. 2021

Sensors

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This study developed a MEMS-based electrochemical seismometer relying on a cathode–anode–cathode (CAC) integrated three-electrode structure where two cathodes were positioned on two surfaces of a silicon wafer, while one anode was positioned on the sidewalls of the through holes of the silicon wafer. Device design and numerical simulations were conducted to model the functionality of the three-electrode structure in detecting vibration signals with the key geometrical parameters optimized. The CAC integrated three-electrode structure was then manufactured by microfabrication, which demonstrated a simplified fabrication process in comparison with conventional four-electrode structures. Device characterization shows that the sensitivity of the CAC microseismometer was an order of magnitude higher than that of the CME6011 (a commercially available four-electrode electrochemical seismometer), while the noise level was comparable. Furthermore, in response to random vibrations, a high correlation coefficient between the CAC and the CME6011 (0.985) was located, validating the performance of the developed seismometer. Thus, the developed electrochemical microseismometer based on an integrated three-electrode structure may provide a new perspective in seismic observations and resource explorations.

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Section: Introductionmentioning

confidence: 99%

MEMS-Based Electrochemical Seismometer Relying on a CAC Integrated Three-Electrode Structure

She

Wang

Chen

et al. 2021

Sensors

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“…A seismometer is a core element in seismic monitoring and geological prospecting [1,2,3]. According to the detecting mechanisms, seismometers can be divided into moving-coil seismometers, piezoelectric seismometers, electromagnetic seismometers, capacitive seismometers, optic-fiber seismometers, and electrochemical seismometers [4,5,6,7,8,9,10]. Table 1 lists the advantages and disadvantages of several kinds of mainstream seismometers.…”

Section: Introductionmentioning

confidence: 99%

Microelectromechanical System-Based Electrochemical Seismometers with Two Pairs of Electrodes Integrated on One Chip

Zheng

Chen

Wang

et al. 2019

Sensors

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This paper presents microelectromechanical system (MEMS)-based electrochemical seismometers with two pairs of electrodes integrated on one chip. Both theoretical analysis and numerical simulations were conducted to reveal the working principle of the proposed electrochemical seismometers, finding that flow holes distributed on cathodes rather than anodes can produce significantly higher sensitivities. The proposed electrochemical seismometers were fabricated based on conventional micromachined processes with high fabrication repeatability. Sensitivity measurements of the proposed seismometers and their commercial counterpart of CME6011 were conducted, indicating the sensitivities of the proposed seismometer with flow holes on cathodes were two orders higher than the counterpart with flow holes on anodes and one order higher than CME6011 at dominant frequencies. Measurements of random ground motions based on the proposed seismometer with flow holes on cathodes and CME6011 were conducted, producing comparable noise levels without observable ground motions and high correlations in response to random events of ground motions. These results validated the functionality of the proposed electrochemical seismometers, which may contribute to seismic monitoring in the near future.

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“…The seismometers are the key sensing elements to detect seismic signals in the fields of geophysical prospection and seismic monitoring [2]. A variety of seismometers were developed, such as the electromagnetic moving-coil seismometers [3], capacitive seismometers [4], optical fiber seismometers [5], micro-electromechanical systems (MEMS) seismometers [6], and electrochemical seismometers [7,8]. The processing of seismic signals has been undoubtedly the motivation and driving factor of many innovations in the signal processing area, remarkably in blind deconvolution, time frequency distributions, and even neural networks [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Measurement of low frequency mechanical vibrations based on an inverted magnetic pendulum

Awad¹,

Orozco²,

Hoyos³

2019

IJECE

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<span>In this paper is presented the mathematical model, design and construction of a prototype of a vibration frequency meter in an adjustable range of 2 Hz to 30 Hz; The experimental results and their analysis are also presented, making a comparative evaluation with the theoretical model. The device is based on the principle of resonance applied in an inverted magnetic pendulum whose natural frequency can be modified by variations of physical parameters. The oscillation of the pendulum is recorded detecting variations in the magnetic field using hall effect sensors; the data recorded with a microprocessor is analyzed and the results are simultaneously plotted in a computer interface. The data obtained were processed to be plotted in the frequency domain, facilitating its analysis. It was proved that the prototype can be used as a frequency meter and that the adjustable character of the device works according to the mathematical model. Finally, The effect of the friction force was studied, it was concluded that the friction force affects the measurement after a considerable period of time of oscillation, but not in the first moments.</span>

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Dynamic characteristics of moving-coil geophone with large damping

Cited by 22 publications

References 0 publications

MEMS-Based Electrochemical Seismometer Relying on a CAC Integrated Three-Electrode Structure

MEMS-Based Electrochemical Seismometer Relying on a CAC Integrated Three-Electrode Structure

Microelectromechanical System-Based Electrochemical Seismometers with Two Pairs of Electrodes Integrated on One Chip

Measurement of low frequency mechanical vibrations based on an inverted magnetic pendulum

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