Fuel level measurement system based on absolute shaft encoder

In this article a new type of absolute shaft encoder is presented for the measurement of fuel level in a tank. This measurement technique is based on the principle of sensing the float arm displacement with respect to the fuel level. Here, the mechanical displacement is detected by an absolute shaft encoder and each position is represented by variant intensity of lights. Furthermore, the variation of light intensity is converted into voltage level by using a signal processing circuit (SPC) and calibrated with measured fuel level. Experimentally, it is observed that the developed prototype is able to measure the fuel level up to the range of 30 cm within the accuracy of ± 1% FSO.