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The rapid measuring of the underwater temperature on a large scale is very important for marine monitoring, and it has vital significances in the civilian and military fields. In this paper, a new coherent Rayleigh scattering method to measure underwater temperature is presented. A wide-band photodetector is used to receive the heterodyne signal combined by the local oscillator laser and water Rayleigh backscattering light, and the water Rayleigh scattering spectrum can be acquired by transform analysis, then the water temperature can be obtained. Firstly, theoretical study and simulation are made on the basic principles of measuring underwater temperature based on Rayleigh scattering. Secondly, theoretical analysis and simulation are made on how to measure water Rayleigh scattering spectrum using coherent detection. Finally, the water temperature measurement accuracy based on Rayleigh scattering is analyzed, showing that for 1 MHz measurement accuracy of Rayleigh scattering spectrum half-width, about 0.35 K temperature measurement accuracy can be achieved.
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Keywords:
- underwater temperature /
- Rayleigh scattering /
- coherent detection
[1] Leonard D A, Caputo B, Hoge F E 1979 Appl. Opt. 18 1732
[2] Becucci M, Cavalieri S, Eramo R, Fini L, Materazzi M 1999 Appl. Opt. 38 928
[3] Hirschberg J G, Byrne J D, Wouters A W, Boynton G C 1984 Appl. Opt. 23 2624
[4] Schorstein K, Fry E S, Walther T 2009 Appl. Phys. B 97 931
[5] Rudolf A, Walther T 2012 Opt. Lett. 37 4477
[6] Gong W, Shi J, Li G, Liu D, Katz J W, Fry E S 2006 Appl. Phys. B 83 319
[7] Shi J, Ouyang M, Gong W, Li S, Liu D 2008 Appl. Phys. B 90 569
[8] Liu J, Bai J H, Ni K, Jing H M, He X D, Liu D H 2008 Acta Phys. Sin. 57 260 (in Chinese) [刘娟, 白建辉, 倪恺, 景红梅, 何兴道, 刘大禾 2008 57 260]
[9] Chen X D, Shi J W, Ouyang M, Liu B, Xu Y X, Shi J L, Liu D H 2009 Acta Phys. Sin. 58 4680 (in Chinese) [陈旭东, 石锦卫, 欧阳敏, 刘宝, 许艳霞, 史久林, 刘大禾 2009 58 4680]
[10] Chen X D, Shi J W, Liu J, Liu B, Xu Y X, Shi J L, Liu D H 2010 Acta Phys. Sin. 59 1047 (in Chinese) [陈旭东, 石锦卫, 刘娟, 刘宝, 许艳霞, 史久林, 刘大禾 2010 59 1047]
[11] Piironen P, Eloranta E W 1994 Opt. Lett. 19 234
[12] Zhu X P, Liu J Q, Chen W B 2010 Chin. J. Lasers 37 2005 (in Chinese) [竹孝鹏, 刘继桥, 陈卫标 2010 中国激光 37 2005]
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[1] Leonard D A, Caputo B, Hoge F E 1979 Appl. Opt. 18 1732
[2] Becucci M, Cavalieri S, Eramo R, Fini L, Materazzi M 1999 Appl. Opt. 38 928
[3] Hirschberg J G, Byrne J D, Wouters A W, Boynton G C 1984 Appl. Opt. 23 2624
[4] Schorstein K, Fry E S, Walther T 2009 Appl. Phys. B 97 931
[5] Rudolf A, Walther T 2012 Opt. Lett. 37 4477
[6] Gong W, Shi J, Li G, Liu D, Katz J W, Fry E S 2006 Appl. Phys. B 83 319
[7] Shi J, Ouyang M, Gong W, Li S, Liu D 2008 Appl. Phys. B 90 569
[8] Liu J, Bai J H, Ni K, Jing H M, He X D, Liu D H 2008 Acta Phys. Sin. 57 260 (in Chinese) [刘娟, 白建辉, 倪恺, 景红梅, 何兴道, 刘大禾 2008 57 260]
[9] Chen X D, Shi J W, Ouyang M, Liu B, Xu Y X, Shi J L, Liu D H 2009 Acta Phys. Sin. 58 4680 (in Chinese) [陈旭东, 石锦卫, 欧阳敏, 刘宝, 许艳霞, 史久林, 刘大禾 2009 58 4680]
[10] Chen X D, Shi J W, Liu J, Liu B, Xu Y X, Shi J L, Liu D H 2010 Acta Phys. Sin. 59 1047 (in Chinese) [陈旭东, 石锦卫, 刘娟, 刘宝, 许艳霞, 史久林, 刘大禾 2010 59 1047]
[11] Piironen P, Eloranta E W 1994 Opt. Lett. 19 234
[12] Zhu X P, Liu J Q, Chen W B 2010 Chin. J. Lasers 37 2005 (in Chinese) [竹孝鹏, 刘继桥, 陈卫标 2010 中国激光 37 2005]
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