A multi-pulse sampling dual-comb ranging (MS-DCR) method is proposed in this paper. Four sampling pulses and two signal pulses separated in the time domain are generated in a repetition period by fiber delay. Through multi-pulse linear optical sampling, eight cross-correlation interferograms (IGMs) are generated in an updating period. The proposed method realizes the multiplication of IGMs so that additional ranging results can be obtained. The experimental results demonstrate that we suppress any random noise by averaging the ranging results and improve the precision of the time-of-flight (TOF) method and carrier-wave interferometric (CWI) method simultaneously. The precision of TOF is improved from 3.85 µm to 1.39 µm without time averaging and that of CWI is improved from 25 nm to 11 nm. The TOF result can link to the interferometric phase with 15 ms averaging, and a precision of 0.48 nm is reached with 0.5 s averaging. The proposed technique overcomes the limitations of linear optical sampling in conventional dual-comb interferometers and achieves faster and higher precision distance measurements without decreasing the unambiguity range.

中文翻译：

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多脉冲采样双梳测距方法。

提出了一种多脉冲采样双梳测距（MS-DCR）方法。通过光纤延迟在重复周期中产生在时域中分离的四个采样脉冲和两个信号脉冲。通过多脉冲线性光学采样，在更新周期中生成了八个互相关干涉图（IGM）。所提出的方法实现了IGM的乘法，从而可以获得额外的测距结果。实验结果表明，我们通过平均测距结果来抑制任何随机噪声，并同时提高了飞行时间（TOF）方法和载波干涉（CWI）方法的精度。无需时间平均，TOF的精度从3.85 µm提高到1.39 µm，CWI的精度从25 nm提高到11 nm。TOF结果可以平均15毫秒链接到干涉仪相位，平均0.5 s可以达到0.48 nm的精度。所提出的技术克服了常规双梳形干涉仪中线性光学采样的局限性，并且在不减小不模糊范围的情况下实现了更快，更高精度的距离测量。