Real-time absolute distance measurement by comb-based generation of multiple wavelengths
Authors: Hyun, Sangwon; Kim, Young-Jin; Chun, Byung Jae; Kim, Seung-Woo
Source: International Journal of Nanomanufacturing, Volume 8, Numbers 5-6, December 2012 , pp. 432-440(9)
Publisher: Inderscience Publishers
Abstract:We present a novel scheme of exploiting the frequency comb of a femtosecond laser as the wavelength ruler for real-time measurement of absolute distances. Four different wavelengths are simultaneously generated in parallel to perform absolute distance measurements by means of multi-wavelength interferometry at an update rate of 100 Hz. When compared to commercial laser interferometers, the proposed scheme shows a discrepancy of 32 nm on average in measuring a ∼2.3 m distance, proving to be a competitive tool for industrial applications.
Document Type: Research Article
Affiliations: Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Science Town, Daejeon, 305-701, South Korea
Publication date: December 2012