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
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[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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