60Co radiation effects and photobleaching properties of polarization-maintaining fiber in fiber optic gyroscopes
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摘要: 从光纤陀螺空间应用的角度出发,利用60Co辐照源模拟空间辐照,对光纤陀螺中的主要部件保偏光纤环进行了不同剂量率的辐照实验,得到了保偏光纤的辐照效应.并且利用大功率半导体激光器对保偏光纤环进行了光褪色实验.实验证明,辐照条件下,保偏光纤损耗增加;剂量率越大,损耗增加越快;总剂量越大,损耗越大;采用大功率半导体激光器对保偏光纤环进行光褪色,可以减缓辐照环境下光纤的损耗增加量,而且激光器功率越大,光褪色效果越明显,可将其用到光纤陀螺中作为其空间应用的抗辐射加固措施.Abstract: For the space application of the interference fiber optic gyroscope(IFOGs), the experiments were made on the PM fiber coil by 60Co radiation source at different dose rate. Radiation effects of it were got from the experiments. And photobleaching experiments were made on the polarization maintain(PM) fiber coil using laser diode(LD). Several conclusions were got form the experiments. First, loss of the PM fiber coil increased in radiation environment. And the bigger the dose rate, the quicker the loss increased. The more the total dose, the bigger the loss. Second, LD photobleaching can meliorate the increased loss of the fiber, and the larger the LD optical power, the better the photobleaching effect. It is concluded that photobleaching can be used in IFOGs as a radiation hardening operation when applied in space.
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