A botdr optical fiber strain distribution curve splicing method

Abstract

The invention discloses a BOTDR optical fiber strain distribution curve splicing method. The method uses a strain data associated weight calculation method as the core and utilizes a sliding quotient solving weight integral to seek a superposed area of strain curves of two optical fibers according to strain data coincidence similarity characteristics obtained after the two ends of each optical fiber are tested, so that automatic splicing of the strain curves is realized, the influence of optical fiber tail end strain data with the lower signal noise ratio to the curve splicing is effectively reduced, the optical fiber strain distribution data splicing efficiency and splicing accuracy are greatly improved, the labor cost is reduced, the test distance of a BOTDR product is lengthened, the measuring accuracy of strain distribution of super-long distance optical fibers is ensured, and the application field of the BOTDR product is widened.

Description

technical field [0001] The invention relates to a method for splicing BOTDR optical fiber strain distribution curves. Background technique [0002] The Brillouin Optical Time Domain Reflectometer (BOTDR) calculates the strain distribution of the optical fiber by measuring the Brillouin frequency shift distribution of the Brillouin backscattered light in the optical fiber. The pulsed light is incident from one end of the optical fiber at a certain frequency, and the incident pulsed light After interacting with the phonons in the fiber, Brillouin scattering occurs, and the back Brillouin scattered light returns to the incident end along the original path of the fiber. Since there is a linear relationship between the frequency shift of the Brillouin scattered light in the fiber and the axial strain and temperature of the fiber, the strain distribution in the fiber can be calculated by measuring the Brillouin scattered frequency shift distribution of the fiber. Brillouin optica...

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Problems solved by technology

[0004] However, at present, the splicing of the BOTDR strain curves at both ends of the optical fiber can only be done manually, by manually finding the overlapping area of ​​the strain curves at both ends, and then manually splicing the two sets of strain curves. Due to the long test distance, the difference between the two measured strain curves The signal-to-noise ratio of the terminal data is very low, the noise is very high, the manual splicing takes a long time, the cost is high, and the error is large, which greatly affects the BOTDR product’s ability to test the strain distribution of ultra-long-distance optical fibers and the strain distribution of ultra-long-distance optical fibers. Promotion and Application of Distribution Testing Field

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