Distributed optical fiber water leakage sensor based on diode optical fiber side coupling effect

Abstract

The invention discloses a distributed optical fiber water leakage sensor based on a diode optical fiber side coupling effect, and relates to the field of water leakage sensors. The sensor mainly comprises a light emitting diode optical fiber and a light detection diode optical fiber, wherein the light emitting diode optical fiber and the light detection diode optical fiber are both a combination of a cuboid optical fiber and a lens structure optical fiber cladding; light emitting diodes which are uniformly distributed and connected with each other are arranged inside the light emitting diode optical fiber, and are positioned at a focus corresponding to the lens structure optical fiber cladding; light detection diodes which are uniformly distributed and connected with each other are arranged inside the light detection diode optical fiber, and are positioned at a focus corresponding to the lens structure optical fiber cladding; the light emitting diode optical fiber and the light detection diode optical fiber are fixedly arranged in parallel in a directly facing manner, and are directly facing to the lens structure optical fiber cladding; and the light emitting diodes and the light detection diodes are also directly facing to each other in a one-to-one correspondence manner. The distributed optical fiber water leakage sensor can monitor the change of refractive index in real time, and can realize high-precision water leakage positioning by a low-cost, simple-structure and all-optical-fiber method.

Description

technical field [0001] The invention relates to the field of water leakage sensors, in particular to a distributed optical fiber water leakage sensor based on the diode optical fiber side coupling effect. Background technique [0002] The traditional optical fiber distributed sensing technology generally has the following problems: (1) measurement blind area is common; (2) it is only sensitive to stress and temperature changes, and cannot directly measure the step change of the refractive index (water leakage event), and needs to rely on special materials It takes a certain amount of time to convert water leakage into stress or temperature changes, which greatly affects the real-time performance of the measurement; (3) The data analysis and processing mechanism is complex, which also affects the real-time performance of the measurement. In addition, the positioning accuracy of existing liquid leakage sensors is generally greater than ±0.5m, and is limited by various constrai...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems that the existing water leakage sensors cannot detect in real time, the processing cost is high, the structure is complex and the service life is affected, the invention provides a distributed optical fiber water leakage sensor based on the side coupling effect of diode optical fiber

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