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Reducing coherent noise in interference systems using the phase modulation technique

机译:使用相位调制技术降低干扰系统中的相干噪声

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The phase modulation technique is adopted to reduce the coherent noise that arises from spurious interference. By choosing an appropriate driving signal, the method can reduce the coherent function of coherent noise to a great degree while keeping the coherent function of a coherent signal nearly unchanged. Simulation results show that for the grating interferometer, the phase error caused by coherent noise is reduced by 81.53% on average. For the Twyman interferometer, the fringe quality and contrast deteriorated by coherent noise are significantly improved. Furthermore, an experiment is set up in the phase-modulated Twyman interferometer to verify the feasibility of the principle. It is concluded that the method is effective to reduce the coherent noise in interference systems. (C) 2015 Optical Society of America
机译:采用相位调制技术以减少由寄生干扰引起的相干噪声。通过选择合适的驱动信号,该方法可以在很大程度上保持相干信号的相干函数几乎不变的同时,极大地降低了相干噪声的相干函数。仿真结果表明,对于光栅干涉仪,相干噪声引起的相位误差平均降低了81.53%。对于Twyman干涉仪,由于相干噪声而导致的条纹质量和对比度得到了显着改善。此外,在调相特威曼干涉仪中进行了实验,以验证该原理的可行性。结论是,该方法可有效减少干扰系统中的相干噪声。 (C)2015年美国眼镜学会

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