JCE_V1_N4_RP5 K. Samrajyam B. Sobha T.D. Gunneswara Rao Journal on Civil Engineering 2249 - 0779 1 4 38 43 POF (Plastic Optimal Fibre), Concrete Structure, CMOD Cracking is one of the frequent causes of complaints in concrete industry. Cracking is known to occur due to fatigue, overloading and damage caused either by loading or environment. The failure of bridges,structures, buildings and dams is due to cracking. This underlines the importance of estimation of crack width as predictor for the health of concrete structures. The results obtained with a POF ( plastic optical fibre) based local (point) sensor that was developed for use with concrete specimens in a three point bend test for in house experiments are reported. The range of CMOD (Crack mouth opening displacements) values are established. September - November 2011 Copyright © 2011 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1698