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飞秒光学频率梳作为精密光学频率标尺,可以用来产生频率稳定度极高的单波长连续激光,利用其多个梳模制备理想的多波长光源用于绝对距离测量具有测量速度快、实时性强、非模糊度量程大、精度高等优点。以多波长测距的基本理论和光梳高频率稳定度为基础,提出了二次合成波长的方法,不仅扩展了非模糊度量程,同时为干涉信号的多波长解调创造了足够的波长间隔条件。结合光梳的波长特点,分析了基于光梳的多波长选择与非模糊度量程的关系,并阐述了具体的选择步骤及波长组合结构。利用小数重合解调算法,在0.01的小数相位测量精度条件下,仿真验证了四波长干涉测距的非模糊度量程为35.636mm,五波长干涉系统可以达到几百毫米的非模糊度量程,后者相对分辨力的动态量程达到109量级。
As a precision optical frequency scale, femtosecond optical frequency combs can be used to produce single-wavelength continuous lasers with extremely high frequency stability and use their multiple combs to create ideal multi-wavelength light sources for absolute distance measurement with fast measurement speed and real-time Strong, non-ambiguous range, high accuracy. Based on the basic theory of multiwavelength ranging and the high frequency stability of the optical comb, a method of secondarily synthesizing wavelength is proposed, which not only expands the non-ambiguity range but also creates enough wavelength spacing conditions for the multi-wavelength demodulation of the interference signal . According to the wavelength characteristics of the optical comb, the relationship between the multi-wavelength selection and the non-ambiguity range based on the optical comb is analyzed, and the specific selection steps and the wavelength combination structure are described. Using the decimal coincidence demodulation algorithm, the non-ambiguity range of the four-wavelength interferometric range is verified to be 35.636 mm under the condition of 0.01 decimal phase measurement accuracy. The five-wavelength interferometer system can reach the non-ambiguity range of several hundred millimeters. The relative resolution of the dynamic range of 109 orders.