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利用光纤3×3耦合器和光纤光栅构成能有效补偿环境干扰的光纤干涉振动测量系统。该测量系统包含干涉臂几乎重合的两个光纤迈克耳孙干涉仪,其中一个光纤迈克耳孙干涉仪利用一个电子反馈环节补偿环境干扰对测量系统的影响,以提高系统的测量精度;另一个光纤迈克耳孙干涉仪利用另一个电子反馈环节跟踪由于振动引起的相位变化,从而实现对振动幅值的测量及振动方向的确定。结果表明,该系统可对频率为0.1～200 Hz的振动进行测量,测量灵敏度为6μm/V。
An optical fiber interference vibration measurement system that can effectively compensate for environmental interference is constructed by using a fiber 3 × 3 coupler and a fiber grating. The measurement system consists of two fiber Michelson interferometers with nearly overlapping interfering arms. One of the fiber-optic Michelson interferometers uses an electronic feedback loop to compensate for the effects of environmental disturbances on the measurement system to improve the system’s measurement accuracy. The other fiber Michelson interferometer uses another electronic feedback link to track the phase changes due to vibration in order to achieve the vibration amplitude measurement and vibration direction determination. The results show that the system can measure the vibration frequency of 0.1 ~ 200 Hz, the measurement sensitivity of 6μm / V.