In this paper we have reported the development of a very easy and cost effective fiber optic sensor on the basis of evanescent wave absorption technique to detect ferrous Fe+2 using high quality light emitting diode (LED). In this method, unclad portion of the fiber was used as sensing element which is exploited to surrounding media consisting Fe+2 ions. Highly sensitive detector has been used to detect the output power of light guided through unclad optical fiber. Graph revealed that, developed sensor is highly sensitive over the dynamic range of concentration from 0.1ppm to 100ppm

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