High-accuracy transient response fiber optic seismic accelerometer using a shock-absorbing ring as a mechanical...

Area of Science:

• Geophysics and Sensor Technology
• Optical Engineering
• Seismic Monitoring

Background:

• Traditional seismic accelerometers face challenges with resonance affecting transient response accuracy.
• Effective seismic data acquisition is crucial for vertical seismic profiling in oilfield operations.
• Developing robust sensors with extended bandwidth and suppressed sensitivity peaks is an ongoing research area.

Purpose of the Study:

• To propose and validate a high-accuracy transient response fiber optic seismic accelerometer.
• To implement a resonance suppression mechanism to improve sensor performance.
• To provide a practical solution for seismic acquisition in smart oilfield environments.

Main Methods:

• Designing a fiber optic seismic accelerometer incorporating a shock-absorbing ring as a mechanical antiresonator.
• Utilizing a resonance suppression mechanism to mitigate sensitivity peaks at resonant frequencies.
• Conducting experimental tests to evaluate transient response and bandwidth under vibration conditions.

Main Results:

• Achieved a 21.79 dB suppression of sensitivity at the resonance frequency.
• Extended the 3 dB operating bandwidth without compromising average sensitivity.
• Demonstrated high-accuracy transient response during vibration-event testing.

Conclusions:

• The proposed resonance suppression mechanism effectively enhances fiber optic seismic accelerometer performance.
• The developed accelerometer offers a practical and accurate solution for vertical seismic profiling in smart oilfields.
• This technology contributes to improved seismic data acquisition and reservoir monitoring.