A defect detection method, a detection image generation method, a system and a storage device
A defect detection and image generation technology, applied in image enhancement, image acquisition, image analysis, etc., can solve the problems of low detection accuracy, low contrast and definition, slow response speed, etc.
Active Publication Date: 2018-12-28
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +4
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[0004] Based on the advantages of terahertz spectroscopy, there is a defect detection method for glass fiber composite materials based on terahertz time-domain spectroscopy technology in the prior art. The transmission-type terahertz time-domain spectroscopy system is used to detect composite materials and extract time-domain spectral data. The time-domain spectral data calculates the image gray values corresponding to all sample points, and finally generates a gray image of the sample, and performs defect discrimination based on the gray image, but the gray image generated by calculating the time-domain spectral data has contrast and clarity. Inferior technical problems lead to low accuracy and slow response of composite material defect detection
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[0073] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to more clearly illustrate the technical solutions of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all embodiments, and cannot limit the protection scope of the present invention with this.
[0074] Before detecting defects in electrical insulation materials, a terahertz time-domain spectroscopy system should be built first, such as figure 1 Shown is a schematic structural diagram of the terahertz time-domain spectroscopy system used in the present invention, including a femtosecond laser source, an optical fiber transmission system, a terahertz radiation source, a terahertz detector and an optical fiber delay system:
[0075] The femtosecond laser source can be a titanium sapphire femtosecond laser source, with a center wavelength of 980nm, a pulse ...
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The invention discloses a defect detection method, a detection image generation method, a system and a storage device. The composite material defect detection method comprises the following steps: acquiring terahertz time domain transmission pulse of each scanning point of a composite material sample; detecting the terahertz time domain transmission pulse of each scanning point of the composite material sample; the terahertz time-domain transmission pulse of each scanning point being analyzed and calculated, and the amplitude gray-scale image and corresponding time gray-scale image of the insulating material sample being generated; the defect detection image of insulating material sample being generated by image fusion of the amplitude gray scale image and the corresponding time gray scaleimage. The invention can improve the contrast and the clarity of the defect detection image, and can be applied to the defect detection of the electric composite sleeve insulation material to realizethe nondestructive detection of the internal defects of the electric composite sleeve insulation material quickly and accurately.
Description
technical field [0001] The present invention relates to the technical field of terahertz nondestructive testing, in particular to a defect detection method, a detection image generation method, a system and a storage device. Background technique [0002] The electrical insulation material is usually a composite material, such as: the outer layer of the electrical composite bushing is silicone rubber, and the inner layer is glass fiber reinforced epoxy resin composite material. The traditional non-destructive testing of composite materials mostly uses ultrasonic and ray testing techniques, but due to excessive attenuation and interference, it is difficult to detect tiny defects. [0003] Terahertz time-domain spectroscopy (THz-TDS) technology is a new technology for far-infrared spectral measurement based on ultrafast laser technology. It uses the characteristic absorption of THz radiation by materials to analyze material composition, structure and other information. The fre...
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IPC IPC(8): G06T1/00G06T7/00G06T5/50G01N21/88
CPCG06T1/0007G06T5/50G06T7/0004G01N21/88G06T2207/20221G01N2021/8887
Inventor 周志成刘建军张建国陈大兵李成钢杨立恒高嵩张晓琴郭东亮伍旺松张中浩梅红伟王黎明
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST