双光梳测距系统测距精度仿真模拟

Simulation of ranging precision based on dual comb ranging system

飞秒光频梳具有超宽光谱范围、超窄脉冲宽度以及超稳脉冲序列间隔的特点,不仅可以利用时域的周期脉冲实现大尺度范围的飞行时间测距,还可以利用频域的相干谱线获得高精度的干涉信息,在大尺度、高精度的绝对距离测量领域能够充分发挥其优势。系统测量得到目标距离与系统参数及大气环境要素密切相关,大气环境要素通过折射率影响测量得到的光程。模拟仿真以上因素对测距精度的影响十分必要。选择了双光梳法作为高精度测距技术方案,详细推导并模拟仿真了系统参数和大气环境要素对测距精度的影响程度。模拟仿真结果表明:随着重复频率的增大,重复频率的抖动对测距结果的影响将减小;减小两光梳间的重复频率差可以提高测距精度;大气环境温度抖动对测量距离的影响为1μm/(m·℃);大气压强抖动对测量距离的影响为2.6μm/(m·kPa);大气湿度对测距的影响较小,为高精度的双光频梳距离测量实验系统提供了理论指导。

Femtosecond optical frequency combs have the characteristics of ultra-wide spectral range,ultra-narrow pulse width and ultra-stable pulse sequence interval.Not only can the periodic pulses in the time domain be used to achieve a large-scale time-of-flight ranging,but also the coherent spectrum in the frequency domain can obtain high-precision interference information.In the field of large-scale and high-precision distance measurement,the optical frequency comb can make full use of its advantages.The target distance measured by the system is closely related to the system parameters and atmospheric environmental factors.The atmospheric environmental factors affect the measured optical path through the refractive index.It is necessary to simulate the influence of the above factors on the ranging precision.The dual-optical comb method was selected as the high-precision ranging technology solution.The effect of system parameters and atmospheric environmental factors on the ranging precision was deduced in theory and simulated in detail,The simulation results show that as the repetition frequency increases,the effect of the jitter of the repetition frequency on the ranging result will decrease;reducing the repetition frequency difference between the two optical combs can improve the ranging precision;the influence of atmospheric environmental temperature jitter on the measurement distance is 1μm/(m·℃);The influence of the atmospheric pressure jitter on the measurement distance is 2.6μm/(m·k Pa);the influence of atmospheric humidity on distance measurement is small.The simulation results provide theoretical guidance for the high-precision optical frequency comb distance measurement experimental system,which can provide theoretical guidance for the high-precision optical frequency comb distance measurement experimental system.