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Research on the fiber dispersion and compensation in large-scale high-resolution broadband frequency-modulated continuous wave laser measurement system

机译：大规模高分辨率宽带调频连续波激光测量系统中光纤色散与补偿的研究

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摘要

The influence of a fiber dispersion calibration interferometer on the measurement results for a large-scale high-resolution broadband frequency-modulated continuous wave (FMCW) measurement system was studied. A model was constructed to simulate the influences of fiber dispersion on the measurements when using a frequency sampling method that corrects the tuning noniinearity. The results indicated that a broadband external cavity tunable laser, in comparison with a semiconductor laser, causes linear variations in the measurement results because of the effect of the fiber dispersion in the calibration interference path for large-scale high-resolution measurements, and these variations decreased the resolution of the measurements. A method that combines chirp slope calibration and phase compensation to reduce the effects of the fiber dispersion was proposed. A gauge block with a height difference of 200 µm at a distance of 2.43 m was measured during the experiments. Before calibrating the fiber dispersion, the frequency spectrum showed false peaks, and it was difficult to distinguish the peaks of the targets. After compensating for the dispersion, the peaks of the targets could be clearly distinguished, and a height difference of 199.6 μm was measured. Using this model and the method to compensate for the dispersion will provide a reference for large-scale high-resolution broadband FMCW laser measurements.
机译：研究了光纤色散校准干涉仪对大规模高分辨率宽带调频连续波（FMCW）测量系统的测量结果的影响。使用校正校正非线性的频率采样方法时，可以构建一个模型来模拟光纤色散对测量的影响。结果表明，宽带外腔可调激光器与半导体激光器相比，由于校准干扰路径中的光纤色散对大规模高分辨率测量的影响，导致测量结果出现线性变化，并且这些变化降低了测量的分辨率。提出了一种结合线性调频斜率校准和相位补偿的方法，以减少光纤色散的影响。在实验过程中，测量了一个高度差为200 µm的量块，其距离为2.43 m。在校准光纤色散之前，频谱显示出错误的峰值，并且很难区分目标的峰值。在补偿色散之后，可以清楚地区分目标的峰，并测量出199.6μm的高度差。使用该模型和补偿色散的方法将为大规模高分辨率宽带FMCW激光测量提供参考。

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  • 来源
    《Optical engineering》 |2015年第7期|074102.1-074102.8|共8页
  • 作者

    Xinke Xu; Guodong Liu; Bingguo Liu; Fengdong Chen; Zhitao Zhuang; Yu Gan; Cheng Lu;

  • 作者单位

    Harbin Institute of Technology, School of Electrical Engineering and Automation, 92 Xidazhi Street, Nangang District, Harbin 150001, China;

    Harbin Institute of Technology, School of Electrical Engineering and Automation, 92 Xidazhi Street, Nangang District, Harbin 150001, China;

    Harbin Institute of Technology, School of Electrical Engineering and Automation, 92 Xidazhi Street, Nangang District, Harbin 150001, China;

    Harbin Institute of Technology, School of Electrical Engineering and Automation, 92 Xidazhi Street, Nangang District, Harbin 150001, China;

    Harbin Institute of Technology, School of Electrical Engineering and Automation, 92 Xidazhi Street, Nangang District, Harbin 150001, China;

    Harbin Institute of Technology, School of Electrical Engineering and Automation, 92 Xidazhi Street, Nangang District, Harbin 150001, China;

    Harbin Institute of Technology, School of Electrical Engineering and Automation, 92 Xidazhi Street, Nangang District, Harbin 150001, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    lasers frequency modulation; interferometry; measurement resolution; frequency sampling method; fiber dispersion; phase error compensation;

    机译：激光器调频;干涉测量测量分辨率频率采样法;纤维分散相位误差补偿;

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