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We propose a high sensitivity fiber optical temperature sensor with simple structure. The sensor is composed of a multimode fiber (MMF) and a short single mode fiber (SMF) whose end is coated with silver film as a reflective mirror. Due to the mismatch between the MMF core and the SMF core, part of guided mode is coupled with the cladding modes of downstream SMF cladding. The mode index difference between the fiber core and cladding is attributed to the phase difference, resulting in interference. When ambient temperature increases, the interference spectrum presents red-drift because of the difference in thermo-dependence. A high temperature sensitivity of 120 pm/℃ is achieved, and the linearity is 99.5%. The configuration is simple and has a compact size, making it a good candidate for distant temperature sensing and oil prospecting.
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Keywords:
- fiber sensor /
- temperature measurement /
- Michelson interferometer
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[12] Zhang J, Sun H, Rong Q Z, Ma Y, Liang L, Xu Q F, Zhao P, Feng Z Y, Hu M L, Qiao X G 2012 Chin. Opt. Lett. 10 070607
[13] Lü C G, Cui Y P, Wang Z Y, Yun B F 2003 Acta Phys. Sin. 53 145 (in Chinese) [吕昌贵, 崔一平, 王著元, 恽斌峰 2003 53 145]
[14] Li Y B, Wang X L, Zhang C 2006 Appl. Phys. Lett. 89 091119
[15] Liu Y, Wei L 2007 Appl. Opt. 46 2516
[16] Nguyen L V, Hwang D, Moon S, Moon D S, Chung Y 2008 Opt. Express 16 11369
[17] Tian Z B, Yam S S H, Loock H P 2008 Opt. Lett. 33 1105
[18] Liu Y, Liu B, Feng X, Zhang W, Zhou G, Yuan S, Kai G, Dong X 2005 Appl. Opt. 44 2382
[19] Zhang Z J, Shi W K, Gao K, Fang Z J 2004 Opt. Technol. 30 525 (in Chinese) [张自嘉, 施文康, 高侃, 方祖捷2004光学技术 30 525]
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[1] Koo K P, Kersey A D 1995 Lightwave Technol. 13 1243
[2] Ball G A, Morey W W, Cheo P K 1993 IEEE Photon. Technol. Lett. 5 267
[3] Qiao X G, Jia Z A, Fu H W, Li M 2004 Acta Phys. Sin. 53 494 (in Chinese) [乔学光, 贾振安, 傅海威, 李明2004 53 494]
[4] Bhatia V, Vengsarkar A M 1996 Opt. Lett. 21 692
[5] Wang Y P, Member, Rao Y J 2005 IEEE Sens. J. 5 839
[6] Wang Y P, Rao Y J, Ran Z L, Zhu T 2003 Acta Phys. Sin. 52 1432 (in Chinese) [王义平, 饶云江, 冉曾令, 朱涛2003 52 1432]
[7] Liu Y G, Liu B, Feng X H, Zhang W G, Zhou G, Yuan S Z, Kai G Y, Dong X Y 2005 Appl. Opt. 44 2382
[8] Dong B, Zhou D P, Wei L 2010 J. Lightwave Technol. 28 1011
[9] Li W, Hao X J, Zhou H C 2010 Elec-Opt. Technol. Appl. 25 54 (in Chinese) [李伟, 郝晓剑, 周汉昌 2010 光电技术应用 25 54]
[10] Sui C H, Cai P G, Xu X J, Chen N B, Wei G Y, Zhou H 2009 Acta Phys. Sin. 58 2792 (in Chinese) [隋成华, 蔡萍根, 许晓军, 陈乃波, 魏高尧, 周红2009 58 2792]
[11] Rao Y J, Zhu T, Yang X C 2007 Opt. Lett. 32 2262
[12] Zhang J, Sun H, Rong Q Z, Ma Y, Liang L, Xu Q F, Zhao P, Feng Z Y, Hu M L, Qiao X G 2012 Chin. Opt. Lett. 10 070607
[13] Lü C G, Cui Y P, Wang Z Y, Yun B F 2003 Acta Phys. Sin. 53 145 (in Chinese) [吕昌贵, 崔一平, 王著元, 恽斌峰 2003 53 145]
[14] Li Y B, Wang X L, Zhang C 2006 Appl. Phys. Lett. 89 091119
[15] Liu Y, Wei L 2007 Appl. Opt. 46 2516
[16] Nguyen L V, Hwang D, Moon S, Moon D S, Chung Y 2008 Opt. Express 16 11369
[17] Tian Z B, Yam S S H, Loock H P 2008 Opt. Lett. 33 1105
[18] Liu Y, Liu B, Feng X, Zhang W, Zhou G, Yuan S, Kai G, Dong X 2005 Appl. Opt. 44 2382
[19] Zhang Z J, Shi W K, Gao K, Fang Z J 2004 Opt. Technol. 30 525 (in Chinese) [张自嘉, 施文康, 高侃, 方祖捷2004光学技术 30 525]
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