Design of sensor water turbidity based on polymer optical fiber

Abstract

This research discusses about polymer optical fiber sensor for measurement of water turbidity. The main material used was an infrared LED, polymer optical fiber and photodetector. Turbidity sensor based on polymer optical fiber has two types; optical fiber sensor with cladding and without cladding. The sensor is made with different types of length and configuration. Turbidity sensor was made, dipped into a turbidity water sample. The measurement was concentration with turbidity percentage. The results showed that the output voltage is affected by the changes of turbidity concentration, sensor length, with or without cladding, and curvature sensor. The bigger of bending of the optical fiber will cause the increasing power losses so the light intensity will be smaller, consequences the measured output voltage will be smaller. Sensitivity and resolution turbidity sensor with cladding showed the best result rather than turbidity sensor without cladding. The best sensor configurations was u with 2 cm lenght and showed output power range, sensitivity, and resolution were 0,931 μW, 0,046 μW/NTU, and 0,022 NTU, respectively.