npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Phys.: Sae Mulli 2020; 70: 681-685

Published online August 31, 2020

Copyright © New Physics: Sae Mulli.

Fiber-Optic Pulsed Ultraviolet Light Sensor for Defective Insulator Monitoring

Su-Jeong PARK, Young-min KO, Jong-Ju MOON, Tae-Jung AHN*

Department of Photonic Engineering, Chosun University, Gwangju 61452, Korea


Received: April 27, 2020; Revised: June 17, 2020; Accepted: June 29, 2020


A fiber-optic pulsed ultraviolet (UV) light sensor, based on a functional polymer-coated optical fiber and butt-coupling of the waveguides, is proposed. The azobenzene polymer was prepared by mixing an azobenzene compound and an UV curing agent. The polymer was applied as a coating on one of two optical fibers and aligned in an alumina fiber ferrule by using a UV curing process. This coating was reversibly stretched by UV light, and in the coated region, the UV light along the fiber induced tensile strains. The strain induced a gap variation between the fibers that resulted in a variation in the optical coupling ratio. The coupling intensity was measured using lock-in amplification to suppress the system noises. We achieved fast detection of UV light, pulsed with a time duration of 0.1 s. This sensing technique is an initial step required to monitor instantaneous UV light in a defective insulator.

Keywords: Ultraviolet sensor, Defective insulator, Fiber-optic sensors, Azobenzene material

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