Estimation method of equivalent relative permittivity for parallel-pair multi-core cables
By measuring the crosstalk spectrum between the core wires of the shielded parallel cable, identifying the maximum or minimum points, and calculating the average frequency difference, the problem of non-invasive, rapid, and non-destructive testing of the equivalent relative permittivity of the cable is solved, achieving efficient and accurate measurement results.
CN115993485BActive Publication Date: 2026-06-30HARBIN INST OF TECH
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Patent Information
- Application Number
- CN202211613576.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-15
- Publication Date
- 2026-06-30
- Estimated Expiration
- 2042-12-15
AI Technical Summary
Technical Problem
Existing technologies make it difficult to perform non-invasive, rapid, and non-destructive testing of the equivalent relative permittivity of cables, and traditional methods may damage the cables or cause measurement results to deviate from the actual values.
Method used
By measuring the crosstalk spectrum between the core wires of the shielded parallel cable, identifying the maxima or minima, calculating the average frequency difference between the maxima or minima, and estimating the equivalent relative permittivity of the cable.
Benefits of technology
It enables non-invasive, rapid, and non-destructive testing of the equivalent dielectric constant of cables, avoiding damage to the cable structure and providing highly accurate measurement results.
✦ Generated by Eureka AI based on patent content.
Abstract
This invention relates to a method for estimating the equivalent relative permittivity of parallel-pair multi-core cables, solving the problem of non-invasive, rapid, and non-destructive testing of the equivalent permittivity of cables. It belongs to the field of cable parameter measurement technology. The invention includes: Step 1, fabricating a cable sample of length l; Step 2, measuring the crosstalk spectrum of the cable sample using a vector network analyzer; Step 3, identifying the maxima and minima in the crosstalk spectrum, calculating the average frequency difference Δf between the maxima and minima, and obtaining an estimated value of the equivalent relative permittivity of the cable sample based on the average frequency difference, where c represents the speed of light in a vacuum. This invention calculates the relative permittivity by measuring the crosstalk amplitude spectrum between the cores of shielded parallel-pair cables, without destroying the cable structure to fabricate samples of the cable insulation material, thus enabling non-invasive, rapid, and non-destructive testing of the equivalent permittivity of cables.
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