基于有源多芯光纤光栅的拍频传感结构及二维矢量传感方法
By using a beat frequency sensing structure composed of active multi-core fiber optic gratings and a two-dimensional vector sensing method, the problem of measuring weak seismic wave signals in deep oil and gas exploration has been solved, achieving high-sensitivity and high-resolution seismic wave signal detection, and enabling the detection of seismic wave vibration acceleration with μg-level resolution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NORTHWEST UNIV
- Filing Date
- 2024-11-29
- Publication Date
- 2026-07-17
AI Technical Summary
Existing fiber Bragg grating sensors are difficult to accurately measure weak seismic wave signals in deep oil and gas exploration, especially when the wavelength shift is less than 0.02 nm. Traditional spectrometers cannot achieve accurate measurement and have insufficient sensitivity and resolution.
A beat frequency sensing structure composed of active multi-core fiber gratings is adopted. By writing gratings with different reflectivities on multi-core optical fibers to form an FP resonant cavity, energy is provided by a pump light source to form a single-frequency laser channel, and the magnitude and azimuth of the vibration signal are obtained by the beat frequency signal, which is converted into frequency difference component measurement.
It improves the measurement accuracy and sensitivity of weak seismic wave signals, enabling the detection of seismic wave vibration acceleration signals with μg-level resolution. The sensitivity is improved by three orders of magnitude, achieving high-resolution seismic wave signal detection.
Smart Images
Figure CN119620160B_ABST