High-resolution frequency-modulated continuous-wave laser ranging for precision distance metrology applications

被引：65

作者：

Shi, Guang ^{[1
]}

Zhang, Fumin ^{[1
]}

Qu, Xinghua ^{[1
]}

Meng, Xiangsong ^{[1
]}

机构：

[1] Tianjin Univ, State Key Lab Precis Measuring Technol & Instrume, Tianjin 300072, Peoples R China

来源：

OPTICAL ENGINEERING | 2014年 / 53卷 / 12期

基金：

中国国家自然科学基金; 高等学校博士学科点专项科研基金;

关键词：

distance measurement; interferometry; tunable lasers; lasers frequency modulated; OPTICAL COHERENCE TOMOGRAPHY; SWEPT SOURCE; INTERFEROMETRY; ERRORS;

D O I：

10.1117/1.OE.53.12.122402

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Frequency-modulated continuous wave (FMCW) laser ranging is one of the most interesting techniques for precision distance metrology. In order to ensure the theoretical measurement range and precision, a narrow linewidth external cavity tunable laser with large tuning range is chosen. In practical situations, the tuning nonlinearity of the laser reduces the measurement precision, hence an auxiliary interferometer is used to measure the laser tuning rate and linearize the frequency ramp. Then, fast Fourier transform algorithm is applied to the resampled signal of the main interferometer, and the full-width at half maximum of the frequency spectrum is narrowed. In the end, the experiments are carried out using the FMCW laser ranging system and demonstrate 50-mu m range resolution at 8.7 m. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)

引用

页数：6

共 11 条

[1] Comb-calibrated frequency-modulated continuous-wave ladar for absolute distance measurements [J].