# 냉각된 원전 2차계통수의 온도측정을 위한 비접촉식 광섬유 온도센서의 개발

• Yoo, Wook-Jae (School of Biomedical Engineering, Konkuk University) ;
• Lee, Bong-Soo (School of Biomedical Engineering, Konkuk University) ;
• Park, Byung-Gi (Department of Energy & Environmental Engineering, Soonchunhyang University) ;
• Cho, Young-Ho (Department of Radiological Science, Catholic University of Daegu)
• 유욱재 (건국대학교 의학공학부) ;
• 이봉수 (건국대학교 의학공학부) ;
• 박병기 (순천향대학교 에너지환경공학과) ;
• 조영호 (대구가톨릭대학교 방사선학과)
• Received : 2010.01.19
• Accepted : 2010.05.13
• Published : 2010.05.31

#### Abstract

Generally, a pH value of secondary water in a nuclear power plant should be estimated after sampling and cooling down. In this process, the measurement of temperature is very important because a pH value is varied according to the temperature of secondary water. In this study, a noncontact fiber-optic temperature sensor using a silver halide optical fiber is fabricated to measure the temperature of cooled secondary water. And we have measured an infrared radiation, which is transferred by a silver halide optical fiber from a heat source, using a thermopile sensor. The relationships between the temperature of a heat source and the output voltage of the fiber-optic temperature sensor according to the change of distance and angle are determined. The measurable temperature range of the fiber-optic temperature sensor is from 25 to $60^{\circ}C$. Based on the results of this study, a noncontact temperature sensor using a silver halide optical fiber can be developed for the temperature measurement of the pH sample in the secondary water system.

#### Acknowledgement

Grant : 원자력연구개발사업 고유강점기술육성분야

Supported by : 한국연구재단

#### References

1. W. J. Yoo, D. H. Cho, S.-C. Chung, G.-R. Tack, J. H. Jun, B. Lee, S. H. Son and S. Cho, "Feasibility study on the development of noncontact temperature sensor using infrared optical fiber", J. Kor. Sensors Soc., vol. 15, pp. 197-185, 2006. https://doi.org/10.5369/JSST.2006.15.3.179
2. M. Shimizu and S. Kachi, "Low-temperature radiometer using infrared fiber", Proc. SPIE, vol. MS 9, pp. 275-276, 1983.
3. W. J. Yoo, D. H. Cho, K. W. Jang, S. H. Shin, J. K. Seo, S.C. Chung, B. Lee, B. G. Park, J. H. Moon, Y.H, Cho and S. Kim, "Infrared radiation thermometer using a silver halide optical fiber for thermal ablation", Opt. Rev, vol. 16, pp. 386-390, 2009.
4. S. N. Lvov, X. Y. Zhou, S. M. Ulyanov and A. V. Bandura, "Reference systems for assessing viability and accuracy of pH sensors in high temperature subcritical and supercritical aqueous solutions", Chem. Geol. vol. 167, pp. 105-115, 2000. https://doi.org/10.1016/S0009-2541(99)00203-X
5. Y. Huh, J.-G. Lee, D. C. Mcphail and K. Kim, "Measurement of pH at Elevated temperatures using the optical indicator acridine", J. Solut. Chem. vol. 22, pp. 651-661, 1993. https://doi.org/10.1007/BF00646784
6. S. N. Lvov, H. Gao, D. Kouznetsov, I. balachov and D. D. Macdonald, "Potentiometric pH measurements in high subcritical and supercritical aqueous solutions", Fluid Phase Equilib., vol. 150-151, pp. 515-523, 1998. https://doi.org/10.1016/S0378-3812(98)00298-2
7. A. Dybko, W. Wroblewski, E. Rozniecka, J. Maciejewski and Z. Brzozka, "Comparison of thermochromic solutions for fibre optic temperature probes", Sens. Actuators, vol. 76, pp. 203-207, 1999. https://doi.org/10.1016/S0924-4247(99)00030-8
8. J. K. Seo, W. J. Yoo, D. H. Cho, K. W. Jang, J. Y. Heo, B. Lee and Y.-K. Koh, "Characteristic analysis of a thermochromic material based fiber-optic temperature sensor for measuring temperature of subsurface water", J. Kor. Sensors Soc., vol. 18, pp. 467-474, 2009. https://doi.org/10.5369/JSST.2009.18.6.467
9. F. J. G. Moreda, F. J. Arregui, M. Achaerandio and I. R. Matias, "Study of indicators for the development of fluorescence based optical fiber temperature sensors", Sens. Actuators B, vol. 118, pp. 425-432, 2006. https://doi.org/10.1016/j.snb.2006.04.079
10. C. Fernandez-Valdivielso, I. R. Matias and F. J. Arregui, "Simultaneous measurement of strain and temperature using a fiber bragg grating and a thermochromic material", Sens. Actuators A, vol. 101, pp. 107-116, 2002 https://doi.org/10.1016/S0924-4247(02)00188-7
11. B. Lee, W. J. Yoo, D. H. Cho, K. W. Jang, S.C. Chung and G.-R. Tack, "Low-temperature radiometric measurements using a silver halide optical fiber and infrared optical devices", Opt. Rev, vol. 14, pp. 355-357, 2007. https://doi.org/10.1007/s10043-007-0355-z
12. A. Zur and A. Katzir, "Fibers for low- temperature radiometric measurements", Appl. Opt. vol. 26, pp. 1201-1206, 1987. https://doi.org/10.1364/AO.26.001201

#### Cited by

1. Development of a fiber-optic temperature sensor for remote measurement of the water temperature in a spent nuclear fuel pool vol.66, pp.10, 2015, https://doi.org/10.3938/jkps.66.1495