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An optical system with potential for remote health monitoring of subsea machinery

机译：具有对水下机械进行远程健康监控的潜力的光学系统

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A prototype fibre-optic sensing system is described with potential to remotely monitor the condition of three-phase variable frequency subsea motors and electric submersible pumps. An indication that the integrity of a powerful electric motor may be compromised can be gained by spectral analysis of the stator drive current, the phases of the currents, the measurement of vibration at specific locations on the motor and the temperature of the bearings. The optical interrogation system is based on an imbalanced Mach-Zehnder fibre interferometer, illuminated with a broadband source with fibre Bragg gratings (FBGs) used as the basic transducers for the current and vibration measurements. Signals were recovered at a distance of 7 km, for the 'in house' current sensor at an effective ac current of 500 A at frequencies from 10 to 1000 Hz with a S/N ratio of 45 dB, together with the relative phases between the currents. These signals were generated with a simulated high power three-phase electric motor. A commercial accelerometer was incorporated into the system which demonstrated a sensitivity of 1 mg Hz~(-1/2) also from 10 to 1000 Hz. As the interrogation system can only be used to detect dynamic signals, a second interrogation for quasi-static temperature measurements is required; although this was not deployed, possible applications other than bearing temperature measurement are considered.
机译：描述了一种原型光纤传感系统，该系统有潜力远程监测三相变频海底电动机和潜水电泵的状况。可以通过对定子驱动电流，电流的相位，电流在电动机上特定位置的振动的测量以及轴承温度的频谱分析来获得表明可能会损害大功率电动机的完整性的指示。光学询问系统基于不平衡的Mach-Zehnder光纤干涉仪，该宽带干涉仪用宽带布拉格光栅（FBG）照明，用作电流和振动测量的基本传感器。信号在7 km的距离处被恢复，“内部”电流传感器在有效交流电流为500 A的情况下，在10至1000 Hz的频率下具有45 dB的信噪比，以及两个传感器之间的相对相位。潮流。这些信号是通过模拟的大功率三相电动机生成的。商业加速度计被并入系统中，该加速度计在10至1000 Hz范围内也显示出1 mg Hz〜（-1/2）的灵敏度。由于询问系统只能用于检测动态信号，因此需要对准静态温度测量进行第二次询问。尽管尚未部署，但考虑了轴承温度测量以外的其他应用。

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