High precision frequency modulated continuous wave (FMCW) laser ranging based on gas cells signal splicing
Received:September 24, 2019  Revised:April 15, 2020  download
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Author NameAffiliationE-mail
YI Ling-Ping State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University, Tianjin 300072, China yi_lingping@163.com 
ZHANG Fu-Min State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University, Tianjin 300072, China zhangfumin@tju.edu.cn 
QU Xing-Hua State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University, Tianjin 300072, China  
LI Ya-Ting State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University, Tianjin 300072, China  
Abstract:In the dual-path FMCW laser ranging system, the length calibration accuracy of the reference optical fiber directly affects the ranging accuracy. In order to improve the ranging accuracy, a high precision reference optical fiber calibration method was proposed, which was based on hydrogen cyanide(H13C14N) gas cells signal splicing. In this paper, the principle of calibration method based on H13C14N gas cells was deeply researched. Moreover, to reduce the burden of data acquisition, H13C14N signal splicing was used to optimize the calibration method. The experiments show that the calibration method based on H13C14N signal splicing is more stable than that based on laser interferometer traditionally. After calibrating the reference optical fiber by using H13C14N. At the same time, within a measuring range of 3.8 m, the error between ranging value of FMCW system and measuring value of interferometer is less than 14 μm, and the standard deviation is less than 17 μm.
keywords:FMCW laser ranging  optical fiber calibration  H13C14N gas cells  resampling
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Copyright:《Journal of Infrared And Millimeter Waves》