Open AccessDistance measurements by combined method based on a femtosecond pulse laser
Author(s) -
Ki-Nam Joo,
Yunseok Kim,
Seung-Woo Kim
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.019799
Subject(s) - optics , femtosecond , interferometry , laser , femtosecond pulse shaping , distance measurement , measure (data warehouse) , pulse (music) , physics , wavelength , materials science , computer science , database , artificial intelligence , detector
We describe a combined interferometric scheme that enables absolute distance measurements using a femtosecond pulse laser. This method is combined with synthetic wavelength interferometry (SWI), time of flight (TOF) and spectrally-resolved interferometry (SRI) using the optical comb of femtosecond laser. Each technique provides distinct measuring resolutions and ambiguity ranges which are complementary to each other. These separate measurement principles are incorporated and implemented simultaneously and the unified output can enhance the dynamic range of the measuring system. Our experimental results demonstrate an example of absolute distance measurement with the proposed technique and we discuss the possibility of the combined method to measure long distances and the important factors for the implementation.