TY - JOUR
T1 - Coating-free reflection technique for fiber-optic sensors based on multimode interference
T2 - A temperature sensing study
AU - Taue, Shuji
AU - Takahashi, Tsuyoshi
AU - Fukano, Hideki
PY - 2016/8/1
Y1 - 2016/8/1
N2 - A novel reflection technique for use in fiber-optic sensors is investigated and applied to a multimode interference structure. The reflectivity at a fiber end face is increased with two operations. Firstly, the light intensity is increased toward the periphery of the end-face by adjusting the fiber length, which is determined theoretically. Secondly, the fiber end-face is deformed into an ellipsoid by heating it with a gas torch. The deformed shape is characterized from microscopic images. The reflected light intensity is increased by more than 10 dB as a result of controlling the fiber length and deforming its end-face. Temperature sensing was performed using the reflection-type multimode interference structure immersed in temperaturecontrolled silicone oil. The resulting sensitivity was 0.028 C for a 29.60mm sensing region, achieved without using any reflection coating.
AB - A novel reflection technique for use in fiber-optic sensors is investigated and applied to a multimode interference structure. The reflectivity at a fiber end face is increased with two operations. Firstly, the light intensity is increased toward the periphery of the end-face by adjusting the fiber length, which is determined theoretically. Secondly, the fiber end-face is deformed into an ellipsoid by heating it with a gas torch. The deformed shape is characterized from microscopic images. The reflected light intensity is increased by more than 10 dB as a result of controlling the fiber length and deforming its end-face. Temperature sensing was performed using the reflection-type multimode interference structure immersed in temperaturecontrolled silicone oil. The resulting sensitivity was 0.028 C for a 29.60mm sensing region, achieved without using any reflection coating.
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U2 - 10.7567/JJAP.55.08RE03
DO - 10.7567/JJAP.55.08RE03
M3 - Article
AN - SCOPUS:84989327943
SN - 0021-4922
VL - 55
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
IS - 8
M1 - 08RE03
ER -