Phase-shifting frequency modulation-based photo-thermal imaging method

An imaging detection and phase shifting technology, applied in the direction of material defect testing, etc., can solve problems such as uneven heating, reduced resolution, and slow detection speed

Inactive Publication Date: 2014-07-02
HARBIN INST OF TECH
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Problems solved by technology

Infrared phase-locking thermal wave nondestructive testing technology is one of the most widely used infrared thermal wave imaging nondestructive testing technologies at present. This technology can overcome the shor

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  • Phase-shifting frequency modulation-based photo-thermal imaging method

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[0017] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0018] Such as figure 1 As shown, the non-destructive detection method of phase shift frequency modulation photothermal imaging provided by the present invention uses computer programming to process infrared image sequences to realize the non-destructive detection of internal defects of the sample. In the figure, the focal plane thermal imager 5 is connected to the Ethernet interface of the computer 8, and computer programming is used to complete the initialization, integration time and sampling frequency setting of the focal plane thermal imager 5. Th...

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Abstract

The invention discloses a phase-shifting frequency modulation-based photo-thermal imaging method which comprises the following steps: S1, generating a phase encoding intrapulse linear frequency modulation signal by utilizing a function generator, performing analog modulation on a power amplifier of a halogen light source, and achieving regular change of light intensity output by the halogen light source according to the phase encoding intrapulse linear frequency modulation signal; S2, connecting a computer with a focal plane thermal infrared imager, and controlling the focal plane thermal infrared imager to acquire a thermal wave radar signal on the surface of a tested sample; and S3, processing the acquired image sequence, extracting time-frequency domain characteristic information of a phase-shifting frequency modulation thermal wave signal, and acquiring a characteristic information image to perform defect detection. A heating heat source is modulated by adopting the phase encoding intrapulse linear frequency modulation signal, the defects of thermal wave imaging detection by a phase locking technique are overcome, and the resolution and detection range of the defect depth are improved.

Description

[0001] technical field [0002] The invention relates to a method for realizing tomographic detection of internal defects of materials by using an active infrared thermal wave detection means, in particular to a photothermal imaging detection method based on phase-shifting and frequency modulation. Background technique [0003] With the rapid development of industrial testing technology, non-destructive testing technology has become one of the necessary means to ensure product quality. Conventional inspections such as ray testing, ultrasonic testing, and electromagnetic testing can only provide two-dimensional images of internal defects in materials, but cannot give three-dimensional tomographic images that characterize defects at different depths inside materials. The emergence of industrial CT technology has realized three-dimensional detection of internal defects in materials , but the detection time is long and the detection cost is high. Active infrared thermal wave im...

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Application Information

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IPC IPC(8): G01N25/72
Inventor 刘俊岩龚金龙王扬
Owner HARBIN INST OF TECH
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