Paper Info
Title
A fiber-optic sensor using an aqueous solution of sodium chloride to measure temperature and water level simultaneously.
Abstract
A fiber-optic sensor system using a multiplexed array of sensing probes based on an aqueous solution of sodium chloride (NaCl solution) and an optical time-domain reflectometer (OTDR) for simultaneous measurement of temperature and water level is proposed. By changing the temperature, the refractive index of the NaCl solution is varied and Fresnel reflection arising at the interface between the distal end of optical fiber and the NaCl solution is then also changed. We measured the modified optical power of the light reflected from the sensing probe using a portable OTDR device and also obtained the relationship between the temperature of water and the optical power. In this study, the water level was simply determined by measuring the signal difference of the optical power due to the temperature difference of individual sensing probes placed inside and outside of the water. In conclusion, we demonstrate that the temperature and water level can be obtained simultaneously by measuring optical powers of light reflected from sensing probes based on the NaCl solution. It is anticipated that the proposed fiber-optic sensor system makes it possible to remotely monitor the real-time change of temperature and water level of the spent fuel pool during a loss of power accident.
Year
DOI
Venue
2014
10.3390/s141018823
SENSORS
Keywords
Field
DocType
fiber-optic sensor,NaCl solution,OTDR,temperature,water level
Optical time-domain reflectometer,Optical power,Optical fiber,Analytical chemistry,Fiber optic sensor,Fresnel equations,Optics,Chemistry,Sodium,Refractive index,Aqueous solution
Journal
Volume
Issue
ISSN
14
10
1424-8220
Citations 
PageRank 
References 
1
0.41
2
Authors
7
Name
Order
Citations
PageRank
Wook Jae Yoo174.06
Hyeok In Sim230.99
Sang Hun Shin353.45
Kyoung Won Jang474.06
S Cho572.07
Joo Hyun Moon610.75
Bongsoo Lee774.06