红外双谱线He-Ne激光用于绝对距离合成波干涉计量的两个方案

Two approaches for absolute distance interferometry by synthetic wavelengths of an infrared dual-line He-Ne laser

本文给出了合成波长的一般计算公式和各级合成波长的测量方程组,介绍了用3.3922μm和3.3912μm双谱线He-Ne激光器产生两级合成波长体系的方法和有关实验结果。提出了两个合成波长干涉测量方案,适用于几米到100米的大尺寸测量,精度优于10^(-6)～10^(-7)。

It is the key of absolute distance interferometry to establish a synthetic-wave measuring chain. This paper gives a general formula of synthetic-wavelength and a conventional measuring equation set for each stage of synthetic wave, and introduces two-stage synthetic hierarchy produced by 3.3922um and3.3912um dual-line He-Ne laser, as well as the related experimental results. On the basis of the hieraehy, this paper puts forward two interference measuring approaches. The discussion and analysis show that these two interfering system can be suitable to measurement of distance ranging from several meters to 100 meters, with an accuracy better than 1x10-6- 1x10-7.