为了实现强电磁场环境下的三维地震高精度勘探,提高油气产量和油气开采率,设计了三分量光弹波导加速度传感器。利用光弹原理设计出可检测加速度的3个轴向分量的集成光路及组合式三分量谐振子,达到了降低加速度各分量串扰的目的。依据LiNbO3光波导相位变化规律对影响该串扰的交叉轴灵敏度和横向灵敏度比进行了分析,结果表明:该传感器的自然频率为3 500 Hz,响应频带为0~3 000 Hz,横向灵敏度比为0.11%。所设计的传感器具有较宽的频带和良好的线性频率响应特性,能够满足高精度地震勘探的要求。

In order to realize the high accuracy seismic exploration in high electro-magnetic fields and to improve oil producibility and oil recovery efficiency,a three-component photoelastic waveguide accelerometer was developed. Based on the photoelastic effect,a Mach-Zehnder integrated optical interferometer was presented to measure the three-orthogonal components of acceleration and a combined three-component simple harmonic vibrator was designed to reduce the cross-talk among the acceleration components. According to the phase variation of a LiNbO3 waveguide under the action of the applied acceleration,the cross-axis sensitivity and transverse sensitivity ratio(TSR) were analysed. Experimental results indicate that the natural frequency of the sensor is 3 500 Hz; response bond is from 0 Hz to 3 000 Hz,and the transverse sensitivity ratio is 0.11%,which can satisfy the sensor requirements of high accuracy seismic exploration.