Nonperpendicular Incidence Induced Spatial Frequency Drift in Polarized Low-Coherence Interferometry and Its Compensation

作者：Liu Tiegen; Shi Junfeng; Jiang Junfeng^*; Liu Kun; Wang Shuang; Yin Jinde; Zou Shengliang

来源：IEEE Photonics Journal, 2015, 7(6): 2600807.

DOI：10.1109/JPHOT.2015.2494505

• Sensors
• fiber optics system
• novel methods

We establish an optical path difference (OPD) distribution model in a spatial scanned polarized low-coherence interferometry (LCI) considering the nonperpendicular incidence of light to explore the spatial frequency drift. Simulation shows that the OPD is no longer linearly distributed on a charged coupled device (CCD) and that the spatial frequency drifts approximately linearly as low coherent interference fringe (LCIF) shifts. A compensation process for spatial frequency domain analysis (SFDA)-based algorithm is proposed to avoid interference-order misidentification and consequent jump error. We verified our analysis and effectiveness of the proposed algorithm with an optical fiber Fabry-Perot pressure sensing experiment. The measured spatial frequency drift agreed well with simulation results, and the interference-order misidentification was eliminated.

• 出版日期2015-12
• 单位天津大学