In this paper, a high sensitivity optic fiber flow sensor with a pair of FBG encapsulated by the elastic diagram is presented. Two FBGs were used to measure the strain and ambient temperature, and for the temperature compensation meanwhile. High sensitivity elastic diaphragms of various materials can be produced by 3D printing. The sensitivity of this kind of stainless sensor can reach 18.59pm/με. The sensor is suitable for the measurement of viscous liquids such as oil and is expected to be used in engineering monitoring in the future.
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