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《Chinese Journal of Lasers》 2018-12
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Distance Measurement Technique of Large Bandwidth Laser Frequency Modulated Continuous Wave Under Sinusoid Frequency Modulation

Shi Chunzhao;Zhang Fumin;Pan Hao;Li Yating;Qu Xinghua;State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University;  
Based on the principle of distance measurement of laser frequency modulated continuous wave(FMCW),a distance measurement system of dual optical path FMCW is set up,which replaces the traditional linear frequency modulation with sinusoid frequency modulation so as to improve the sweep frequency.The principle of distance measurement of FMCW under sinusoid frequency modulation is also studied,the resampling formulas of sine sweep is derived,and the signal synthesis method to increase the sweep bandwidth and the quadrature modulation method to eliminate the stitching error are put forward.The experimental result shows that after the quadrature modulation method is used to splice the equal-light frequency resampling correction signal,the frequency resolution reaches to127μm,very close to the theoretical resolution.It is no more than 203μm of the error and less than 194μm of the standard deviation compared with the reference interferometer within the range between 3.3and 4meters.
【Fund】: 国家自然科学基金(51675380);; “光电测试技术”北京市重点实验室开放课题(GDKF2015007)
【CateGory Index】: TN24
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