Title :
High Sensitive FBG Sensor for Equivalent Salt Deposit Density Measurement
Author :
Guo-Ming Ma ; Jun Jiang ; Rui-duo Mu ; Cheng-Rong Li ; Ying-Ting Luo
Author_Institution :
State Key Lab. of Alternate Electr. Power Syst. with Renewable Energy Sources, North China Electr. Power Univ., Beijing, China
Abstract :
Online monitoring of the contamination condition of power transmission line is important to prevent insulation from flashover. The conventional online monitoring methods are easily disturbed by the strong electromagnetic interference around the high voltage line. In this letter, Bragg wavelength of polyimide coated fiber Bragg grating (FBG) is found to be slightly restrained by the salt deposited on the polyimide surface. Based on the effect, a special designed FBG sensor is proposed for detecting equivalent salt deposit density (ESDD) on insulators of power transmission line. To improve the sensor sensitivity, multiple polyimide layers are coated on the naked FBG, and in the curing process a 0.15-N force is applied on the free end of FBG to form uniform layers. Experiment results show the restrain wavelength varies with the ESDD. The resolution can be improved with multiple polyimide layers.
Keywords :
Bragg gratings; fibre optic sensors; humidity sensors; monitoring; polymers; power cable testing; contamination condition; contamination measurement; equivalent salt deposit density measurement; fibre Bragg grating sensor; high sensitive FBG sensor; high voltage line; multiple polyimide layers; online monitoring methods; polyimide coated fiber Bragg grating; polyimide surface; power line testing; power transmission line; strong electromagnetic interference; Contamination; Fiber gratings; Humidity; Insulators; Monitoring; Polyimides; ESDD; Insulator; contamination; fiber Bragg grating; monitoring; quasi-distribution;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2364200
