Linear frequency modulation ultrasonic excitation-based infrared thermal wave nondestructive testing method and system
A non-destructive testing, infrared thermal wave technology, applied in material analysis using acoustic wave emission technology, optical testing flaws/defects, etc., can solve the problems of slow detection speed, low signal-to-noise ratio of temperature signal, uneven heating, etc., to achieve accurate detection , Improve the effect of signal-to-noise ratio and contrast
Active Publication Date: 2014-07-16
HARBIN INST OF TECH
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Ultrasonic infrared phase-locked thermal imaging technology is one of the most widely used ultrasonic infrared thermal wave non-destructive testing technologies. This technology can overcome the shortcomings of uneven heating and slow detection speed, but the signal-to-noise ratio of the temperature signal of this method is low.
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[0028] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited to this. 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 shall be covered by the present invention. In the scope of protection.
[0029] Such as figure 1 As shown, the infrared thermal wave imaging non-destructive testing method with linear frequency modulation ultrasonic excitation is a non-destructive testing method that uses computer software to process the infrared image sequence to realize the internal defects of the sample. In the figure, the focal plane infrared thermal imager 24 is connected to the Ethernet interface of the computer 2, and the computer 21 is used to initialize and image the focal plane thermal imager 24 for setting. The ultrasonic probe 27 injects ultrasonic waves...
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The invention discloses a linear frequency modulation ultrasonic excitation-based infrared thermal wave nondestructive testing method and system. The method comprises the following steps: S1, adjusting spatial positions of an ultrasonic excitation head and a tested sample, and switching on a switch of a cylinder pressing device to ensure that the ultrasonic excitation head is in close contact with the surface of the tested sample, controlling a signal generator to generate a linear frequency modulation pulse signal through a computer, and driving an ultrasonic generator and power amplifier unit to ensure that the ultrasonic power regularly changes according to the linear frequency modulation pulse signal; S2, starting an ultrasonic generator, and acquiring a surface thermal wave signal of the tested sample; and S3, processing the acquired surface thermal wave signal, extracting time-frequency domain characteristic information of the surface thermal wave signal, and integrating the time-frequency domain characteristic information to obtain a characteristic image for characterizing internal defects of the material. The system comprises an ultrasonic excitation device, the ultrasonic generator and power amplifier unit, the signal generator, a focal plane thermal infrared imager and the computer. The internal defects of the material can be rapidly and accurately detected by the method and the system.
Description
technical field [0001] The invention relates to a method and system for realizing nondestructive detection of material defects by means of infrared thermal wave detection means excited by ultrasonic red, in particular to a method and system for nondestructive detection of infrared thermal waves excited by linear frequency modulation ultrasonic waves. Background technique [0002] Ultrasonic infrared thermal wave nondestructive testing technology is an active infrared thermal wave imaging nondestructive testing technology that uses ultrasonic waves as the excitation source. This technology can effectively detect contact interface type defects, such as metal fatigue cracks, composite material delamination, and debonding defects. Cracks and impact damage with hard and brittle materials. The propagation speed of ultrasonic waves in solids is fast and the attenuation is small. When interacting with the internal defects of the material, heat will be generated in the defect area. T...
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Login to View More IPC IPC(8): G01N21/88G01N29/14
Inventor 刘俊岩秦雷王扬龚金龙
Owner HARBIN INST OF TECH