Table of Contents
Journal of Photonics
Volume 2013, Article ID 528478, 7 pages
Research Article

Monitoring of Moisture in Transformer Oil Using Optical Fiber as Sensor

Department of EEE, Don Bosco College of Engineering and Technology, Assam Don Bosco University, Guwahati, Assam 781017, India

Received 26 March 2013; Revised 21 June 2013; Accepted 1 July 2013

Academic Editor: Luciano Mescia

Copyright © 2013 S. Laskar and S. Bordoloi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper describes an optical fiber sensor and temperature sensor-based instrumentation system to measure the moisture content in transformer oil. The sensor system consists of (i) Diode Laser Source, (ii) a bare and bent multimode fiber as sensor probe, (iii) an LDR as detector, (iv) LM35-based temperature sensor, and (v) microcontroller system having a trained ANN for processing and calibration. The bare and bent optical fiber sensor and the temperature sensor LM35 are used to provide the measures of refractive index (RI) and temperature of a transformer oil sample. An ATmega32-microcontroller-based system with trained ANN algorithm has been developed to determine the moisture content of the transformer oil sample by sampling the readings of the bare bent optical fiber sensor and the temperature sensor.