Special Section on Advances of Precision Optical Measurements and Instrumentation for Geometrical and Mechanical Quantities

Absolute distance measurement with extension of nonambiguity range using the frequency comb of a femtosecond laser

[+] Author Affiliations
Yoon-Soo Jang

Korea Advanced Institute of Science and Technology, Department of Mechanical Engineering, Science Town, Daejeon 305-701, Republic of Korea

Keunwoo Lee

Korea Advanced Institute of Science and Technology, Department of Mechanical Engineering, Science Town, Daejeon 305-701, Republic of Korea

Seongheum Han

Korea Advanced Institute of Science and Technology, Department of Mechanical Engineering, Science Town, Daejeon 305-701, Republic of Korea

Joohyung Lee

Korea Advanced Institute of Science and Technology, Department of Mechanical Engineering, Science Town, Daejeon 305-701, Republic of Korea

Korea Research Institute of Standards and Science, Science Town, Daejeon 305-600, Republic of Korea

Young-Jin Kim

Korea Advanced Institute of Science and Technology, Department of Mechanical Engineering, Science Town, Daejeon 305-701, Republic of Korea

Seung-Woo Kim

Korea Advanced Institute of Science and Technology, Department of Mechanical Engineering, Science Town, Daejeon 305-701, Republic of Korea

Opt. Eng. 53(12), 122403 (May 08, 2014). doi:10.1117/1.OE.53.12.122403
History: Received March 10, 2014; Revised April 8, 2014; Accepted April 10, 2014
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Abstract.  We revisit the method of synthetic wavelength interferometry (SWI) for absolute measurement of long distances using the radio-frequency harmonics of the pulse repetition rate of a mode-locked femtosecond laser. Our intention here is to extend the nonambiguity range (NAR) of the SWI method using a coarse virtual wavelength synthesized by shifting the pulse repetition rate. The proposed concept of NAR extension is experimentally verified by measuring a 13-m distance with repeatability of 9.5 μm (root-mean-square). The measurement precision is estimated to be 31.2 μm in comparison with an incremental He–Ne laser interferometer. This extended SWI method is found to be well suited for long-distance measurements demanded in the fields of large-scale precision engineering, geodetic survey, and future space missions.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Yoon-Soo Jang ; Keunwoo Lee ; Seongheum Han ; Joohyung Lee ; Young-Jin Kim, et al.
"Absolute distance measurement with extension of nonambiguity range using the frequency comb of a femtosecond laser", Opt. Eng. 53(12), 122403 (May 08, 2014). ; http://dx.doi.org/10.1117/1.OE.53.12.122403


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