Method for detecting internal defects of thick glass fiber skin structure
A technology for internal defects and detection methods, applied in radiation pyrometry, optical testing flaws/defects, measuring devices, etc., can solve the problems of poor detection effect, long time consumption, etc., achieve fast speed, improve heating rate, and high precision Effect
Pending Publication Date: 2022-06-24
HUNAN UNIV
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[0006] The purpose of the present invention is to provide a method for detecting internal defects of a glass fiber thick skin structure, so as to solve the problems of poor detection effect and long time consumption of internal defects of the existing skin structure
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[0049] The technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.
[0050] The technical solutions of the present application will be described in detail below with specific examples. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.
[0051] like figure 1 As shown, a method for detecting internal defects in a glass fiber thick skin structure provided in this embodiment includes the following steps:
[0052] 1. Division of...
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Abstract
The invention discloses a method for detecting internal defects of a thick glass fiber skin structure, which comprises the following steps of: dividing a to-be-detected area into a plurality of sub-areas, acquiring thermal imaging data of the whole to-be-detected area before heating by using a thermal imager, and acquiring the thermal imaging data of the sub-areas by using the thermal imager while periodically heating the sub-areas by using an excitation source; when the temperature rise of the sub-regions exceeds the set temperature, periodic heating of the sub-regions is completed, noise reduction filtering, filling, Fourier transformation, Bessel transformation and other processing are carried out on thermal imaging data of the sub-regions in different heating periods, then periodic normalization processing is carried out, and observable data are obtained; whether internal defects exist or not can be determined according to the observable data. According to the method, the low-resolution thermal imager can be used for detecting the small-size internal defects, the detection efficiency is improved by periodically heating the sub-regions, the small-size internal defects can be detected in cooperation with periodic normalization processing, and the detection precision is high.
Description
technical field [0001] The invention belongs to the technical field of thermal imaging and detection, and in particular relates to a method for detecting internal defects of glass fiber thick skin structures based on active periodic thermal imaging. Background technique [0002] Glass fiber thick skin structure refers to a complex geometric glass fiber material with a skin thickness of more than 5mm, an internal sandwich or a hollow link structure, such as glass used in wind turbine blades, small wing casings, fuselage components and other products. Slim skin structure. The glass fiber thick skin structure of wind turbine blades, small wing casings, fuselage components, etc. is limited by the existing manufacturing process and material process. During the manufacturing process of glass fiber and carbon fiber, lay-up folds, resin debonding, bulging, voids, etc. Defects are unavoidable. These defects will further harm the performance of the glass fiber thick skin structure du...
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IPC IPC(8): G01N21/88G01J5/48
CPCG01N21/88G01J5/00G01J2005/0077
Inventor 王洪金侯岳骏沈国际何赟泽李响王耀南
Owner HUNAN UNIV