A high-reliability acceleration sensor based on fiber Bragg grating (FBG) that can be used in downhole for a long time is proposed, which is aimed at solving the problem of low-reliability of existing optical fiber acceleration sensors in the field of petroleum and natural gas resources exploration. The acceleration sensor uses the inertial force generated by the mass to make the symmetrically tilting cantilever beams bend slightly to detect the vibration signal. Using solder glass to package FBG is an important method to ensure that the sensor maintains high stability in harsh environment. It can significantly reduce the creep and improve the thermal shock resistance of the sensor. Through theoretical calculation, the sensitivity formula of sensor is derived, and the size parameters that can maximize sensitivity is solved by MATLAB. After that, the performance of the sensor and the stability at high temperature are tested. Experiments show that the operating frequency range of the acceleration sensor is from 0.1 Hz to 30 Hz, the sensitivity is 290 pm/g at room temperature, and the maximum lateral interference degree is 3.6%. Most importantly, the sensor packaged by glass welding can keep excellent stability under long-term high temperature. Moreover, the sensor has a quick response to severe temperature shock and can maintain measuring accuracy after cyclic thermal shocks. Therefore, the sensor can be reliably used for micro-vibration measurement in harsh environments such as downhole.

提出一种可长期在井下使用的基于光纤布拉格光栅（FBG）的高可靠性加速度传感器，旨在解决石油和石油领域现有光纤加速度传感器可靠性低的问题。天然气资源勘探。加速度传感器利用质量产生的惯性力，使对称倾斜的悬臂梁轻微弯曲以检测振动信号。使用焊锡玻璃封装FBG是确保传感器在恶劣环境下保持高稳定性的重要方法。它可以显着减少蠕变并提高传感器的抗热震性。通过理论计算，推导出传感器的灵敏度公式，并通过MATLAB求解使灵敏度最大化的尺寸参数。之后，测试了传感器的性能和高温稳定性。实验表明，加速度传感器的工作频率范围为0.1 Hz～30 Hz，室温下灵敏度为290 pm/g，最大横向干扰度为3.6%。最重要的是，玻璃焊接封装的传感器可以在长期高温下保持出色的稳定性。此外，该传感器对严重的温度冲击具有快速响应，并且在循环热冲击后仍能保持测量精度。因此，该传感器可以可靠地用于井下等恶劣环境下的微振动测量。室温下灵敏度为290 pm/g，最大横向干扰度为3.6%。最重要的是，玻璃焊接封装的传感器可以在长期高温下保持出色的稳定性。此外，该传感器对严重的温度冲击具有快速响应，并且在循环热冲击后仍能保持测量精度。因此，该传感器可以可靠地用于井下等恶劣环境下的微振动测量。室温下灵敏度为290 pm/g，最大横向干扰度为3.6%。最重要的是，玻璃焊接封装的传感器可以在长期高温下保持出色的稳定性。此外，该传感器对严重的温度冲击具有快速响应，并且在循环热冲击后仍能保持测量精度。因此，该传感器可以可靠地用于井下等恶劣环境下的微振动测量。