Method for measuring incidence point, incidence angle and delay of small-angle longitudinal wave angle probe for porcelain insulator

A ceramic insulator, small-angle technology, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve the problems of narrow maximum amplitude swimming range, inability to measure time delay and longitudinal wave incident angle at the same time, to avoid poor repeatability , The system error is small, the effect of precise positioning

Active Publication Date: 2015-03-25
STATE GRID CORP OF CHINA +1
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Problems solved by technology

Because of the small angle of incidence δ, the range of the highest amplitude is too narrow, and the refracted longitudinal and transverse waves in the steel exist simultaneously, the small-angle longitudinal-wave oblique probe cannot find the circular arc on the CSK-ⅠA test block like ordinary shear-wave probes. The highest echo on the surface can qui

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  • Method for measuring incidence point, incidence angle and delay of small-angle longitudinal wave angle probe for porcelain insulator
  • Method for measuring incidence point, incidence angle and delay of small-angle longitudinal wave angle probe for porcelain insulator

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[0015] The present invention is a method for measuring the incident point, time delay and incident angle of a small-angle longitudinal wave oblique probe for porcelain insulators. The steps are as follows (see attached figure 1 , 2 )

[0016] (1) Measuring the incident point and delay of the reference shear wave straight probe:

[0017] Choose a straight shear wave probe as the reference shear wave probe 1. Then make a special test block for the transverse wave straight probe. The upper part: a right-angled triangular machine glass block 2 made of plexiglass with a certain size and a certain inclination angle, and the lower part: a boat shape made of a steel block 3 (rectangular and 1 / 4 circle) The combination of plexiglass block 2 and steel block 3 uses very thin aluminum foil, copper foil or phenyl salicylate as the shear wave coupling agent 5 to closely fit, so that the ultrasonic wave can pass through the plexiglass and steel. Surface; the inclination angle α of the straight ...

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Abstract

The invention relates to a method for measuring the incidence point, incidence angle and delay of a small-angle longitudinal wave angle probe for a porcelain insulator. The method comprises the following steps: (1) selecting a transverse wave straight probe as a base probe; (2) manufacturing a special test block for the transverse wave straight probe; (3) measuring the incidence point and delay of the base transverse wave straight probe by virtue of the special test block for the transverse wave straight probe; (4) manufacturing a special test block for the small-angle longitudinal wave angle probe; and (5) measuring the incidence point and delay of the base transverse wave straight probe by virtue of the special test block for the transverse wave straight probe. According to the invention, the incidence point, delay and longitudinal wave incidence angle of the small-angle longitudinal wave angle probe can be measured conveniently, rapidly and accurately, the system error is less than 5%, and the accurate locating of defects can be realized after measured accurate data is input into a digital ultrasonic flaw detector.

Description

technical field [0001] The invention relates to a method for measuring the incident point, time delay and incident angle of a small-angle longitudinal wave oblique probe for porcelain insulators. Background technique [0002] Ultrasonic small-angle longitudinal wave detection method has been widely used to detect porcelain insulators and porcelain-sleeved pillars of power grids in service. The small-angle longitudinal-wave oblique probe with a longitudinal-wave incidence angle δ of 3.8°-5.67° can detect defects deeply buried inside the ceramic body in the flange, and the scanning coverage of the dangerous area is much larger than that of the shear-wave oblique probe and straight probe. In order to realize the precise positioning of defects, it is necessary to accurately measure the incident point, delay time and incident angle of the small-angle longitudinal wave oblique probe. Because of the small angle of incidence δ, the range of the highest amplitude is too narrow, and ...

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Application Information

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IPC IPC(8): G01N29/04
Inventor 李中伟杨宏伟王冬超刘云刘钊郭振新
Owner STATE GRID CORP OF CHINA
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