A continuous fuel level sensor using a side-emitting optical fiber is introduced in this paper. This sensor operates on the modulation\r\nof the light intensity in fiber, which is caused by the cladding�s acceptance angle change when it is immersed in fuel. The fiber\r\nis bent as a spiral shape to increase the sensor�s sensitivity by increasing the attenuation coefficient and fiber�s submerged length\r\ncompared to liquid level. The attenuation coefficients of fiber with different bent radiuses in the air and water are acquired through\r\nexperiments. The fiber is designed as a spiral shape with a steadily changing slope, and its response to water level is simulated. The\r\nexperimental results taken in water and aviation kerosene demonstrate a performance of 0.9m range and 10mm resolution.
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