Peak value width polymerization filtering methods using circumference coordinates system
A technology of aggregation filtering and coordinate system, applied in impedance network, digital technology network, electrical components, etc., to achieve the effect of improving detection sensitivity
Active Publication Date: 2011-02-09
SHANGHAI BAOSIGHT SOFTWARE CO LTD
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to aggregate the peak margins of surface noise signals and defect signals on the circular coordinate system, and aggregate the "8" or "0" peaks into "1" shaped peak, so that the noise signal and defect signal Completely separated from the phase angle θ, no longer Mutual masking, thus improving the detection sensitivity of small defect signals
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[0029] Combine below figure 2 , image 3 , Figure 4 The schematic diagram illustrates in detail how the present invention achieves the purpose of improving the detection sensitivity of flaw detection equipment.
[0030] figure 2 is the pattern of the original signal. Although the vibration phase angles of the surface noise and the defect signal are different, the surface noise has a larger margin and covers the defect signal. The influence of the noise signal on the defect signal cannot be avoided only by phase sorting, so that the noise signal and the defect signal cannot be distinguished.
[0031] image 3 , Figure 4 is the schematic diagram of the signal after peak-margin aggregation filtering using the phase domain, image 3 The peaks are represented by scatter points, Figure 4 The peaks are represented by a single line. After the peak and margin aggregation in the phase domain, the peak and margin are all aggregated, and the surface noise and defect signals ...
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The invention provides a peak value edge width polymerization filtering method which adopts a circumference coordinate system, including the following steps: step 1. two lines of signals which are obtained by comparison of a sensor are carried out the coordinate transformation, an X axis and a Y axis of a rectangular coordinate system are transformed into a r axis and a Theta axis of the circumference coordinate system; step 2. the r value sequence is carried out the smooth processing to remove the small interference burrs, so as to ensure the accurate seeking of the peak value; step 3. the wave peak, the wave trough and the demarcation point are sought in the r value sequence; step 4. the polymerization of the peak value is completed; step 5. the differentiation is carried out on the phase angle Theta of the circumference coordinate system. The peak value edge width polymerization filtering method which adopts the circumference coordinate system that is provided by the invention can solve the problem that the differentiation can not be carried out as the noise signal on the same phase angle is stronger than the defect signal in the eddy current or magnetic leakage flaw detection equipments.
Description
technical field [0001] The invention relates to a filtering method in signal analysis and processing, in particular to a peak and margin aggregation filtering method using a circular coordinate system in eddy current and magnetic flux leakage flaw detection. Background technique [0002] In eddy current and magnetic flux leakage testing equipment, the excitation signal is a standard sine wave, and the sensor feedback signal is slightly deformed on the basis of the sine wave because it contains the defect signal. The sensor signal is compared with the excitation signal to form two signals, one of which represents the relative amplitude change of the feedback signal, and the other represents the phase change of the feedback signal. Draw these two signals as X and Y values directly in the Cartesian coordinate system to form an "8" figure. It can be seen that the dynamic vibration angles of the defect signal and the surface noise signal on the two-dimensional plane are differe...
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IPC IPC(8): G01N27/82H03H17/02
Inventor 金根顺李瑞忠
Owner SHANGHAI BAOSIGHT SOFTWARE CO LTD