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Working-point control method for readout of dynamic phase changes in interferometric fiber-optic sensors by tuning the laser frequency

机译:通过调整激光频率来读出干涉式光纤传感器中动态相位变化的工作点控制方法

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摘要

A simple but reliable method, namely the working-point control by tuning the laser frequency, for the dynamic phase shift measurement in a passive homodyne interferometric fiber-optic sensor is proposed. A dc voltage calculated from the photodetector output is applied to the light source to control the interferometer at the condition of maximum sensitivity. Then the signal's phase shift can be obtained from the components of zero and fundamental frequencies. To test the method, an all polarization-maintaining Mach-Zehnder interferometer with a piezoelectric ceramic (PbZrTiO_(3), or PZT) cylinder in one arm is constructed. The experimental results show that the simulation signal's phase shift generated by the PZT cylinder can be read out correctly with the method. It has the advantages of simplicities of operation, no-active element in the sensing head, and large operating bandwidth. It can be used for readout of dynamic phase shifts in various interferometric fiber-optic sensors.
机译:提出了一种简单而可靠的方法,即通过调谐激光频率进行工作点控制,以用于无源零差干涉式光纤传感器中的动态相移测量。从光电探测器的输出计算出的直流电压被施加到光源,以在最大灵敏度的条件下控制干涉仪。然后,信号的相移可以从零频率和基频获得。为了测试该方法,构造了一个全极化保持马赫曾德尔干涉仪,在一个臂中装有压电陶瓷(PbZrTiO_(3)或PZT)圆柱体。实验结果表明,该方法能正确读出PZT圆柱体产生的仿真信号相移。它具有操作简单,传感头中没有有源元件以及工作带宽大的优点。它可用于读出各种干涉式光纤传感器中的动态相移。

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