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Optical cable metal sheath layer fault detection method based on unipolar coded pulses

A technology of coding pulse and metal sheath, applied in the field of testing, can solve the problem of not increasing the signal power, and achieve the effect of reducing measurement noise and improving the system signal-to-noise ratio

Inactive Publication Date: 2012-10-03
NANJING UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Technical problem: The purpose of this invention is to provide a method for detecting faults on the metal sheath layer of optical cables. This method uses coded pulses as detection signals and can be used without Under the premise of increasing the signal power without reducing the spatial resolution, the measurement noise can be effectively reduced and the signal-to-noise ratio of the system can be improved

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  • Optical cable metal sheath layer fault detection method based on unipolar coded pulses
  • Optical cable metal sheath layer fault detection method based on unipolar coded pulses
  • Optical cable metal sheath layer fault detection method based on unipolar coded pulses

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Embodiment Construction

[0027] The method for detecting the failure of the metal sheath of the optical cable based on the unipolar coded pulse of the present invention includes the following steps:

[0028] 1) Use software to generate a unipolar encoding matrix, which has such mathematical characteristics: the sum of the squares of the elements of its inverse matrix is ​​less than the order of the matrix;

[0029] 2) Use a signal generator to generate a unipolar sequence pulse corresponding to the row vector of the matrix in step 1), and input it as a detection signal to the conditioning circuit; the conditioning circuit inputs the sequence pulse into the metal sheath of the optical cable to be tested, and at the same time The sequence pulse is used as the trigger signal; the conditioning circuit receives the pulse signal reflected from the optical cable under test, and the data acquisition system collects the data at the same time;

[0030] 3) Perform signal processing on the collected data. The signal pro...

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Abstract

The invention discloses a fault detection method for an optical cable metal sheath layer based on unipolar coded pulses, which takes the pulse time domain reflection principle as the fundamental principle. The method provided by the invention comprises the following steps of: taking the unipolar coded pulses as detection signals, wherein element quadratic sum of a unipolar matrix inversion matrix is less than order of the unipolar matrix inversion matrix; gathering the signals by a data gathering card; performing signal decoding reduction treatment; finding positions of fault points by reading time differences between transmitting signals and reflected signals; and approximately judging the fault type of the optical cable metal sheath layer by identifying a wave shape. The method provided by the invention can effectively detect the fault of the optical cable metal sheath layer.

Description

technical field [0001] The invention relates to a fault detection scheme for a metal sheath layer of an optical cable, and belongs to the technical field of testing. Background technique [0002] In communication engineering, various types of optical cables (land optical cables, submarine optical cables) have been widely used in communication backbone lines. Due to various natural environmental factors and human factors, communication optical cables are often damaged. There are two common types of damage to communication optical cables: damage to the optical unit and damage to the sheath layer. Past statistics show that if the damage to the sheath layer is not repaired in time, it will likely lead to damage to the optical unit. At present, the detection and location of optical unit faults inside optical cables can be realized by OTDR, BOTDR and other technologies. But when the optical signal can be used to locate the fault of the optical cable, the fault is already very ...

Claims

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Application Information

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IPC IPC(8): G01D3/028
Inventor 徐伟弘殷杰张旭苹
Owner NANJING UNIV