Instrumental Methods for Extending the Amplitude-Frequency Responses of a Geophone

Besedina, A. N.; Kabychenko, N. V.; Павлов, Д. В.; Volosov, S. G.

doi:10.3103/s0747923920020048

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…The acceleration influence function conforms to the transfer function form of the second-order bandpass filter. Keeping

unchanged and only increasing the damping ratio

= 0.3 to

= 10, then the moving coil geophone will be in the frequency range from

, and the response to acceleration will be flat [ 39 ]. The traditional way to increase the damping ratio is to introduce negative resistance.…”

Section: Series Circuit Correction Methodsmentioning

confidence: 99%

“…For geophone V g , the load is the input impedance of R NEG amplifier U 1 at the inverting input. This impedance is subtracted from the resistance of the geophone coil R g , which increases the damping [ 39 ].…”

Section: Series Circuit Correction Methodsmentioning

confidence: 99%

“…The disadvantage of the negative resistance method is that after the negative resistance is introduced, the impedance caused by the inductance cannot be ignored when the frequency of the system is high, resulting in an uneven acceleration response curve and distortion [ 37 , 39 ].…”

Section: Series Circuit Correction Methodsmentioning

confidence: 99%

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An Effective Method for Improving Low-Frequency Response of Geophone

et al. 2023

Sensors

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The natural frequency of traditional velocity sensors such as moving coil geophones limits their measurable low-frequency range, and the damping ratio affects the flatness of the sensor in the amplitude and frequency curves, resulting in variations in sensitivity over the available frequency range. In this paper, the structure and working principle of the geophone are analyzed and its dynamics are modeled. After synthesizing the negative resistance method and zero-pole compensation, two commonly adopted low-frequency extension methods, a method for improving low-frequency response, which is a series filter and a subtraction circuit to increase the damping ratio, is proposed. Applying this method to improve the low-frequency response of the JF-20DX geophone, which has a natural frequency of 10 Hz, results in a flat response to acceleration in the frequency range from 1 to 100 Hz. Both the PSpice simulation and actual measurement show a much lower noise level via the new method. Testing the vibration at 10 Hz, the new method has a 17.52 dB higher signal-to-noise ratio than the traditional zero-pole method. Both theoretical analysis and actual measurement results show that this method has a simple circuit structure, introduces less circuit noise, and has a low-frequency response improvement effect, which provides an approach for the low-frequency extension of moving coil geophones.

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“…The acceleration influence function conforms to the transfer function form of the second-order bandpass filter. Keeping

unchanged and only increasing the damping ratio

= 0.3 to

= 10, then the moving coil geophone will be in the frequency range from

, and the response to acceleration will be flat [ 39 ]. The traditional way to increase the damping ratio is to introduce negative resistance.…”

Section: Series Circuit Correction Methodsmentioning

confidence: 99%

Section: Series Circuit Correction Methodsmentioning

confidence: 99%