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Time-spectrum analysis process method of ultrasonic testing material of coarse crystalline

A technology of time-frequency analysis and ultrasonic testing, applied in the use of sound wave/ultrasonic wave/infrasonic wave to analyze solids, electrical digital data processing, special data processing applications, etc. Amplification ability, signal distortion and other problems, to achieve the effect of easy understanding and judgment, Q value optimization, high time-frequency resolution

Inactive Publication Date: 2005-11-16
TSINGHUA UNIV
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Problems solved by technology

However, the current continuous wavelet analysis technology for noise suppression is based on the energy reduction method of threshold threshold processing. Since the threshold threshold processing suppresses noise signals while reducing a large amount of defect information, continuous wavelet noise reduction technology will cause serious signal distortion. , and does not have the ability to enhance and amplify defect information, and cannot meet the needs of ultrasonic testing of coarse-grained materials

Method used

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  • Time-spectrum analysis process method of ultrasonic testing material of coarse crystalline
  • Time-spectrum analysis process method of ultrasonic testing material of coarse crystalline
  • Time-spectrum analysis process method of ultrasonic testing material of coarse crystalline

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Embodiment Construction

[0023] The detection object used in the accompanying drawings is coarse-grained austenitic stainless steel (grade OCr18Ni9Ti), and the traditional separation spectrum technology cannot detect the two φ0.5mm horizontal through-hole defects contained in it with a distance of 5mm. .

[0024] Press " three-step method " principle of the present invention, concrete implementation process is as follows:

[0025] Step 1: Obtain high-quality time-frequency images.

[0026] The time-frequency decomposition of the ultrasonic reflection signal x(t) of the coarse-grained material is performed by continuous wavelet transform:

[0027] WT ( τ , a ) = ∫ - ∞ + ∞ x ( t ) 1 a φ...

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Abstract

A method for analyzing and processing time - frequency of coarse - grain material ultrasonic detection includes obtaining best quality of time - frequency image, picking up defect information of time -frequency image, displaying A form of defect information. The method has more powerful ability to discover small defects and has excellent intensifier effect of signal to noise ratio.

Description

technical field [0001] The invention relates to a time-frequency analysis and processing method for ultrasonic detection of coarse-grained materials, and belongs to the technical field of ultrasonic nondestructive testing. Background technique [0002] Coarse-grained materials (such as austenitic stainless steel and titanium alloys) have attracted much attention due to their extensive applications in the nuclear and aerospace industries, and their safety testing is very important. However, due to the strong scattering of ultrasonic waves by coarse grains, the ultrasonic reflection signal of coarse-grained materials is accompanied by serious material noise, which makes it very difficult to detect internal defects (such as cracks) in coarse-grained materials. Ultrasonic testing of coarse-grained materials is a major technical problem in the field of nondestructive testing. [0003] At present, separation spectrum technology is the leading technology for ultrasonic testing of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/06G06F17/00
Inventor 施克仁张秀峰
Owner TSINGHUA UNIV
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