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对于光纤光栅传感的非平衡干涉解调技术,理论和实验均证实充当其驱动元件的压电陶瓷通电发热会引入热噪声,导致解调输出的相移信息中出现附加相移。为排除热噪声对解调结果的干扰,提出了将驱动元件从干涉装置中分离出来的新方案。对于无温度控制、有温度控制以及分离驱动元件的三种Michelson非平衡干涉解调装置,实验证实第三种方案不仅可根除热噪声的影响,且无需克服热惯性而达到新的热平衡。系统传感灵敏度的实验值为0.9609°/με,分辨率可达5.5nε。
For fiber Bragg grating sensing unbalanced interferometric demodulation technology, theoretical and experimental results confirm that the piezoelectric ceramic conduction heating acting as its driving component will introduce thermal noise, resulting in additional phase shift in the phase shift information of the demodulated output. In order to eliminate the interference of thermal noise on the demodulation result, a new scheme of separating the driving element from the interference device is proposed. For the three Michelson unbalanced interferometric demodulation devices without temperature control, with temperature control, and with separate drive components, experiments show that the third option not only eliminates the effects of thermal noise but also achieves a new thermal balance without overcoming thermal inertia. The experimental sensitivity of the system sensing value of 0.9609 ° / με, a resolution of up to 5.5nε.