Optical fiber with double fiber cores for sensing

Abstract

An optical fiber with double fiber cores for sensing comprises cladding I and cladding II arranged outside the cladding I. The cladding I is provided with a fiber core I and a fiber core II in parallel, the refractive indexes of the fiber core I and the fiber core II are bigger than that of the cladding I, the refractive index of the cladding I is bigger than that of the cladding II, and a protective layer is arranged outside the cladding II. Optical signals are injected in the end face of the optical fiber with double fiber cores, and therefore the optical signals exist in the fiber core I, the fiber core II, the cladding I and the cladding II. Through a short transmission distance, the optical signals only exist in the fiber core I and the fiber core II, the optical signals in the fiber core I and the fiber core II can be maintained relatively stable, and when a change occurs to the optical fiber, the optical signals in the fiber core I and the fiber core II are reallocated, the changes of the optical signals inside the fiber core I and the fiber core II can be monitored by arranging detection equipment on the end portion of the optical fiber with the double fiber cores, and the monitoring aim is achieved. The optical fiber with the double fiber core for sensing is simple in structure, low in cost, wide in use and good in market prospect.

Description

technical field [0001] The invention relates to an optical fiber, in particular to an optical fiber for sensing with double cores. Background technique [0002] Long-distance oil, water or gas pipelines are widely used due to the advantages of high work efficiency, safety, and low cost. However, there is currently no suitable means for monitoring long-distance pipelines. Based on ordinary optical fiber Brillouin scattering sensing The device has the advantage of distributed monitoring of temperature and strain, but its high cost limits its popularization. Contents of the invention [0003] The invention discloses a dual-core sensing optical fiber. Two optical signal transmission channels are formed in the optical fiber. By detecting the change of the optical signal between the two optical signal channels, the purpose of distributed monitoring can be achieved. The optical fiber has the advantages of convenient use, low cost and good application prospect. [0004] In order...

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Problems solved by technology

[0002] Long-distance oil, water or gas pipelines are widely used due to the advantages of high work efficiency, safety, and low cost. However, there is currently no suitable means for monitoring long-distance pipelines. Based on ordinary optical fiber Brillouin scattering sensing The device has the advantages of distributed monitoring of temperature and strain, but its high cost limits its popularization

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