Abstract
Every optical state polarization in Sagnac fiber optic current sensor (S-FOCS) is restricted in specific stage theoretically. However, complex transforming processes of optical state polarization induce illegal linear optical state polarization and illegal circular optical state polarization in Sagnac fiber optic current sensor, then, decrease performance of S-FOCS. According to the parameters of the optical components, we built Jones matrixes and the mathematical model of optical transmission in S-FOCS. Based on polarization state error models of Sagnac fiber optic current sensor, we made experiments to evaluate performances of several key components, including polarizer, quarter-wave retarder and sensing head, then, investigate the influence of several main polarization error factors on S-FOCS's performance practically. The result shows that the changing degree of polarization state causes bias instability, nonlinear of scale ratio, and random noises of S-FOCS, and influents S-FOCS's performance.
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