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Large-scale high-accuracy measurement plays an important role in many applications, such as large-scale equipment manufacturing, space technology and national defense industry. High-accuracy absolute distance measurement by laser is an important research topic in the field of large-scale high-accuracy measurement. And frequency modulated continuous wave (FMCW) laser ranging is a hot point of research nowadays. Because this method is better than pulsed time-of-flight method in measurement resolution, and the problem of ambiguity in measurement, which is the main disadvantage of phase-related method, does not exist. In this paper, the principle of FMCW laser ranging and the main factors reducing the measurement resolution are analyzed. In order to improve the ranging resolution, the method using an auxiliary interferometer to sample the signal in equal intervals of optical frequency is employed. A dual interferometer FMCW laser ranging system is designed and the experiments are carried out. The experimental results show that the measurement resolution is 50 μm at a distance of 10 m.
[1] Liu Z X, Zhu J G, Yang L H, Liu H Q, Wu J, Xue B 2013 Meas. Sci. Technol. 24 105004
[2] Swinkels B L, Bhattacharya N, Braat J J M 2005 Opt. Lett. 30 2242
[3] Cabral A, Rebordão J 2007 Opt. Eng. 46 073602
[4] Xing S J, Zhang F M, Cao S Y, Wang G W, Qu X H 2013 Acta Phys. Sin. 62 170603(in Chinese)[邢书剑, 张福民, 曹士英, 王高文, 曲兴华 2013 62 170603]
[5] Qin P, Chen W, Song Y J, Hu M L, Chai L, Wang Q Y 2012 Acta Phys. Sin. 61 240601(in Chinese)[秦鹏, 陈伟, 宋有建, 胡明列, 柴路, 王清月 2012 61 240601]
[6] Wang G C, Yan S H, Yang J, Lin C B, Yang D X, Zou P F 2013 Acta Phys. Sin. 62 070601(in Chinese)[王国超, 颜树华, 杨俊, 林存宝, 杨东兴, 邹鹏飞 2013 62 070601]
[7] Li Z D, Jiang Y S, Sang F, Wang L C, Deng S G, Xin Y, Guo J P 2011 Acta Opt. Sin. 31 0314001(in Chinese)[李志栋, 江月松, 桑峰, 王林春, 邓士光, 辛遥, 郭泾平 2011 光学学报 31 0314001]
[8] Zheng J 2004 Appl. Opt. 43 4189
[9] Satyan N, Vasilyev A, Rakuljic G, Leyva V, Yariv A 2009 Opt. Express 17 15991
[10] Roos P A, Reibel R R, Berg T, Kaylor B, Barber Z W, Babbitt W R 2010 Opt. Lett. 34 3692
[11] Iiyama K, Matsui S, Kobayashi T, Maruyama T 2011 IEEE Photon. Technol. Lett. 23 703
[12] Baumann E, Giorgetta F R, Coddington I, Sinclair L C, Knabe K, Swann W C, Newbury N R 2013 Opt. Lett. 38 2026
[13] Lin B, Liang S, Zhang C X, Lin W T, Li Q, Zhong X, Li L J 2010 Chin. Phys. B 19 124217
[14] Hu Y M, Yang W L, Xiao X, Feng M, Li C H 2014 Chin. Phys. B 23 034205
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[1] Liu Z X, Zhu J G, Yang L H, Liu H Q, Wu J, Xue B 2013 Meas. Sci. Technol. 24 105004
[2] Swinkels B L, Bhattacharya N, Braat J J M 2005 Opt. Lett. 30 2242
[3] Cabral A, Rebordão J 2007 Opt. Eng. 46 073602
[4] Xing S J, Zhang F M, Cao S Y, Wang G W, Qu X H 2013 Acta Phys. Sin. 62 170603(in Chinese)[邢书剑, 张福民, 曹士英, 王高文, 曲兴华 2013 62 170603]
[5] Qin P, Chen W, Song Y J, Hu M L, Chai L, Wang Q Y 2012 Acta Phys. Sin. 61 240601(in Chinese)[秦鹏, 陈伟, 宋有建, 胡明列, 柴路, 王清月 2012 61 240601]
[6] Wang G C, Yan S H, Yang J, Lin C B, Yang D X, Zou P F 2013 Acta Phys. Sin. 62 070601(in Chinese)[王国超, 颜树华, 杨俊, 林存宝, 杨东兴, 邹鹏飞 2013 62 070601]
[7] Li Z D, Jiang Y S, Sang F, Wang L C, Deng S G, Xin Y, Guo J P 2011 Acta Opt. Sin. 31 0314001(in Chinese)[李志栋, 江月松, 桑峰, 王林春, 邓士光, 辛遥, 郭泾平 2011 光学学报 31 0314001]
[8] Zheng J 2004 Appl. Opt. 43 4189
[9] Satyan N, Vasilyev A, Rakuljic G, Leyva V, Yariv A 2009 Opt. Express 17 15991
[10] Roos P A, Reibel R R, Berg T, Kaylor B, Barber Z W, Babbitt W R 2010 Opt. Lett. 34 3692
[11] Iiyama K, Matsui S, Kobayashi T, Maruyama T 2011 IEEE Photon. Technol. Lett. 23 703
[12] Baumann E, Giorgetta F R, Coddington I, Sinclair L C, Knabe K, Swann W C, Newbury N R 2013 Opt. Lett. 38 2026
[13] Lin B, Liang S, Zhang C X, Lin W T, Li Q, Zhong X, Li L J 2010 Chin. Phys. B 19 124217
[14] Hu Y M, Yang W L, Xiao X, Feng M, Li C H 2014 Chin. Phys. B 23 034205
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