A method and system for detecting defects in a post insulator structure based on photoacoustic pressure effect

By adjusting the spatial configuration and dynamic compensation of the laser and acoustic receiving devices, and combining dual-pulse differential excitation and coherent superposition technology, the problems of signal attenuation and noise interference in long-distance photoacoustic detection were solved, and reliable identification and accurate positioning of structural defects in post insulators were achieved.

CN122108962APending Publication Date: 2026-05-29STATE GRID JILIN ELECTRIC POWER CO LTD ULTRA-HIGH VOLTAGE CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID JILIN ELECTRIC POWER CO LTD ULTRA-HIGH VOLTAGE CO
Filing Date
2026-04-22
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing photoacoustic detection methods are difficult to reliably extract structural defect features from weak photoacoustic signals and accurately locate them in long-distance, dynamic interference environments. Furthermore, they are affected by environmental noise and signal attenuation, and cannot meet the detection requirements of high-voltage power transmission and transformation systems.

Method used

A defect detection method for post insulator structures based on photoacoustic pressure effect is adopted. By adjusting the spatial configuration of the laser excitation device and the acoustic signal receiving device, combined with dynamic adjustment of environmental parameters, the acoustic signal is acquired using a dual-pulse differential excitation mode. The defect location is determined by coherent superposition and triangulation techniques, and the physical coordinates of the defect are output by combining a three-dimensional digital model.

Benefits of technology

It effectively overcomes the problems of signal attenuation and environmental interference at long distances, improves the reliability and positioning accuracy of defect identification, and can accurately identify structural defects of post insulators in complex environments.

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Abstract

The application relates to the technical field of nondestructive testing of power equipment, and discloses a method and system for detecting structural defects of a post insulator based on a photoacoustic pressure effect, which comprises the following steps: according to the installation position of the post insulator, a laser and a sound receiving device are configured, and a focused and directed dynamic adjustment is combined with response environment parameters; two groups of sound signals are obtained by adopting a double-pulse differential excitation mode, and subtraction is performed to suppress common-mode noise; the differential sound signals are divided into subbands according to frequencies, periodic coherent superposition is performed to improve a signal-to-noise ratio; effective characteristic frequency bands are screened according to subband energy density and phase stability; defect scales are determined by combining characteristic frequency band parameters, and a defect space position is located by utilizing a time difference of multiple receivers; and finally, the position is registered to an insulator three-dimensional digital model to output physical coordinates. The application can effectively overcome the problems of signal attenuation and environmental interference at a long distance, and improve defect recognition reliability and positioning accuracy.
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