Multiplexed Hard-Polymer-Clad Fiber Temperature Sensor Using An Optical Time-Domain Reflectometer

Title & Authors
Multiplexed Hard-Polymer-Clad Fiber Temperature Sensor Using An Optical Time-Domain Reflectometer
Lee, Jung-Ryul; Kim, Hyeng-Cheol;

Abstract
Optical fiber temperature sensing systems have incomparable advantages over traditional electrical-cable-based monitoring systems. However, the fiber optic interrogators and sensors have often been rejected as a temperature monitoring technology in real-world industrial applications because of high cost and over-specification. This study proposes a multiplexed fiber optic temperature monitoring sensor system using an economical Optical Time-Domain Reflectometer (OTDR) and Hard-Polymer-Clad Fiber (HPCF). HPCF is a special optical fiber in which a hard polymer cladding made of fluoroacrylate acts as a protective coating for an inner silica core. An OTDR is an optical loss measurement system that provides optical loss and event distance measurement in real time. A temperature sensor array with the five sensor nodes at 10-m interval was economically and quickly made by locally stripping HPCF clad through photo-thermal and photo-chemical processes using a continuous/pulse hybrid-mode laser. The exposed cores created backscattering signals in the OTDR attenuation trace. It was demonstrated that the backscattering peaks were independently sensitive to temperature variation. Since the 1.5-mm-long exposed core showed a 5-m-wide backscattering peak, the OTDR with a spatial resolution of 40 mm allows for making a sensor node at every 5 m for independent multiplexing. The performance of the sensor node included an operating range of up to $\small{120^{\circ}C}$, a resolution of $\small{0.59^{\circ}C}$, and a temperature sensitivity of $\small{-0.00967dB/^{\circ}C}$. Temperature monitoring errors in the environment tests stood at $\small{0.76^{\circ}C}$ and $\small{0.36^{\circ}C}$ under the temperature variation of the unstrapped fiber region and the vibration of the sensor node. The small sensitivities to the environment and the economic feasibility of the highly multiplexed HPCF temperature monitoring sensor system will be important advantages for use as system-integrated temperature sensors.
Keywords
Language
English
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References
1.
Marcos, A., R., Valdir, A., S. and Francisco, S., "Sidepolished Microstructured Optical Fiber for Temperature Sensor Application", IEEE Photonics Technology Letters, Vol. 19, No. 21, 2007, pp. 1738-1740.

2.
Daniel, C.B., Lothar, S., Michael, N.T. and Michael, K., "Structural Monitoring Using Fiber-optic Bragg Grating Sensors", Structural Health Monitoring, Vol. 2, No. 2, 2003, pp. 145-152.

3.
Fumio, T., Kazushi, U. and Takeo, K., "Multipoint Temperature Measurement Technology using Optical Fiber", FUJITSU Sci. Tech., Vol. 46, No. 1, 2010, pp. 28-33.

4.
Yoo, W., J., Jang, K., W., Seo, J., K., Moon, J., Han, K., Park, J., Park, B., G. and Lee, B., "Development of a 2-Channel Embedded Infrared Fiber-Optic Temperature Sensor Using Silver Halide Optical Fibers", Sensors, Vol. 11, No. 10, 2011, pp. 9549-9559.

5.
Liqiu, M., Ping, L. and Qiying, C., "A Multiplexed Fiber Bragg Grating Sensor for Simultaneous Salinity and Temperature Measurement", Journal of Applied Physics, Vol. 103, Issue 5, 2008, pp. 1-7.

6.
Eric, U., "Fiber Optic Sensors; an Introduction for Engineers and Scientists", WILEY-INTERSCIENCE, 2006, pp. 413-419.

7.
Hewa-Gamage, G. and Chu, P., L., "A Multiplexed Point Temperature Fibre Sensor Array using OTDR Technique and TDM Mechanism", Institute of Electrical and Electronics Engineers, Vol. 2, 2002, pp. 111-118.

8.
Jianfeng, W., Yongxing, J., Zaixuan, Z., Changyu, S. and Yanqing, Q., "Research of Distributed Optical Fiber Temperature Sensor (DTS) System with Optical Switch", Institute of Electrical and Electronics Engineers, Vol. 10, 2010,

9.
Moyo, P., Brownjohn, J., Suresh, R. and Tjin, S., "Development of Fiber Bragg Grating Sensors for Monitoring Civil Infrastructure", Engineering Structures, Vol. 27, No. 12, 2005, pp. 1828-1834.

10.
Hideaki, I., Hiroshi, Y., Keiji, S. and Akira, M., "Structural Health Monitoring System Using FBG-Based Sensors for a Damage Tolerant Building", International Workshop on Structural Health Monitoring, Vol. 1, 2001, pp. 1-10.

11.
Miao, S., Ben, X., Xinyong, D. and Yi, L., "Optical Fiber Strain and Temperature Sensor Based on an In-line Mach-Zehnder Interferometer using Thin-core Fiber", Optics Communications, Vol. 285, No. 18, 2012, pp. 3721-3725.

12.
Zhan-Sheng, G., "Strain and Temperature Monitoring of Asymmetric Composite Laminate using FBG Hybrid Sensors", Structural Health Monitoring, Vol. 6, No. 3, 2007, pp. 191-197.

13.
Jose, M., Luis, R., Antonio, Q. and Adolfo, C., "Fiber Optic Sensors in Structural Health Monitoring", Journal of Lightwave Technology, Vol. 29, No. 4, 2002, pp. 587-608.

14.
Liu, Y., Lei, T., Wei, T., Sun, Z., Wang, C. and Liu, T., "Application of Distributed Optical Fiber Temperature Sensing System based on Raman Scattering in Coal Mine Safety Monitoring", Institute of Electrical and Electronics Engineers, Vol. 1, 2012, pp. 1-4.

15.
Jose, M., L., "Handbook of Optical Fibre Sensing Technology", WILEY, 2002, pp. 482-493.

16.
Hong-Nan, L., Dong-Sheng, L. and Gang-Bing, S., "Recent Applications of Fiber Optic Sensors to Health Monitoring in Civil engineering", Engineering Structures, Vol. 26, No. 11, 2004, pp. 1647-1657.

17.
Yun, C. Y., Dipesh, D., Lee, J. R., Park, G. and Kwon, I. B., "Design of Multiplexed Fiber Optic Chemical Sensing System using Clad-removable Optical Fibers", Optics & Laser Technology, Vol. 44, No. 1, 2012, pp. 269-280.

18.
Kim, D. U., Bae, S. C., Kim, J., Kim, T. Y., Park, C. S. and Oh, K., "Hard Polymer Cladding Fiber (HPCF) Links for High-Speed Short Reach 1 4 Passive Optical Network (PON) Based on All-HPCF Compatible used Taper Power Splitter", Institute of Electrical and Electronics Engineers Photonics Technology Letters, Vol. 17, No. 11, 2005, pp. 2355-2357.

19.
Kim, H. C. and Lee, J. R., "A Novel Fiber Optic Temperature Monitoring Sensor using Hard-polymer-clad fiber and Optical Time-domain Reflectometer", Journal of Intelligent Material Systems and Structures, Vol. 25, No. 5, 2014, pp. 654-661.

20.
Hwang, D., Yoon, D., Kwon, I., Seo, D. and Chung, Y., "Novel Auto-correction Method in a Fiber-optic distributedtemperature Sensor using Reflected Anti-Stokes Raman Scattering", Optics Express, Vol. 18, No. 10, 2010, pp. 9747- 9754.

21.
Rongqing, H. and Maurice, O., "Fiber Optic Measurement Techniques", ELSEVIER ACADEMIC PRESS, 2009, pp. 384-385.

22.
Kohich, A., Kiyoshi, N. and Takeshi, I., "Optical Time Domain Reflectometry in a Single-Mode Fiber", IEEE Journal of Quantum Electronics, Vol. 17, No. 6, 1981, pp. 862-868.

23.
Kalpakjian, S. and Schmid, S. R., Manufacturing Processes for Engineering Materials, Second Ed. Addison- Wesley Publishing Company, New York, USA, 1992.