Infrared nondestructive testing method based on thermal image time sequence characteristics

An infrared non-destructive testing and timing technology, applied in the direction of optical testing flaws/defects, etc., can solve the problems of poor recognition effect of single image processing and lack of feature information, and achieve the effect of accurate effect, wide detection range and simple operation.
CN103439342AInactive Publication Date: 2013-12-11EAST CHINA JIAOTONG UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
EAST CHINA JIAOTONG UNIVERSITY
Publication Date
2013-12-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an infrared nondestructive testing method based on thermal image time sequence characteristics. The new method with pixel as a unit is used for the infrared nondestructive test of flaws and is based on thermal image time sequence characteristics and PNN (probabilistic neural network). The infrared nondestructive testing method comprises the following steps: firstly, obtaining an infrared time sequence thermal image of a heating test piece in a cooling process by an infrared thermal imager; secondly, extracting the gray values of normal and abnormal areas in the time sequence thermal image, establishing the relationship between the gray values of different areas and time and then obtaining the corresponding initial time sequence characteristics; thirdly, reducing the dimensions of the initial characteristics by adopting main constituent analysis so as to obtain the time sequence characteristics; and finally establishing the probabilistic neural network with the time sequence characteristics as training samples.
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Description

Technical field

[0001] The invention relates to an infrared non-destructive detection method, in particular to an infrared non-destructive detection method based on the time sequence characteristics of a heat map. Background technique

[0002] Infrared non-destructive testing is a non-destructive testing method that has developed rapidly in recent years. Compared with conventional eddy current, ray and other testing technologies, this testing technology is non-contact, full-field, large-area, fast, intuitive, and easy to achieve automatic testing. After the infrared image is processed by special software, defects can be identified. In addition, there are no special requirements for the surrounding environment during testing. The equipment is light and movable, which is especially suitable for field applications and online and in-service inspections. . In foreign countries, this technology has been used for non-destructive testing of metal and non-metal materials and their compos...

Claims

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