title: Intensity evaluation using a femtosecond pulse laser for absolute distance measurement.
abstract: In this paper, we propose a method of intensity evaluation based on different pulse models using a femtosecond pulse laser, which enables long-range absolute distance measurement with nanometer precision and large non-ambiguity range. The pulse cross-correlation is analyzed based on different pulse models, including Gaussian, Sech(2), and Lorenz. The DC intensity and the amplitude of the cross-correlation patterns are also demonstrated theoretically. In the experiments, we develop a new combined system and perform the distance measurements on an underground granite rail system. The DC intensity and amplitude of the interference fringes are measured and show a good agreement with the theory, and the distance to be determined can be up to 25 m using intensity evaluation, within 64 nm deviation compared with a He-Ne incremental interferometer, and corresponds to a relative precision of 2.7×10(-9).
authors.forename: Hanzhong
authors.initials: H
authors.lastname: Wu
authors.forename: Fumin
authors.initials: F
authors.lastname: Zhang
authors.forename: Jianshuang
authors.initials: J
authors.lastname: Li
authors.forename: Shiying
authors.initials: S
authors.lastname: Cao
authors.forename: Xiangsong
authors.initials: X
authors.lastname: Meng
authors.forename: Xinghua
authors.initials: X
authors.lastname: Qu