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Analysis of main parameters of hazardous eddy current testing

2021-03-20 10:55:24
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Phase difference is a key parameter in eddy current testing. It is of great practical significance to select proper phase Angle for the accuracy of eddy current testing results. The phase Angle often referred to here is the myopia degree of the offset of the spatial vector of the data signal received by eddy current flaw detection. The appropriate phase Angle can make the force difference between the human defect or natural defect and the noise greatly, so as to obtain the signal-to-noise ratio. However, in the whole process of specific inspection, the typical defects of the stainless steel sheet must be used to calibrate the eddy current flaw detection system software, according to the space vector of the typical defects to adjust the phase difference, so that the output of the data signal of the typical defects is large. In addition, with the change of the filling index, the phase Angle should be adjusted appropriately to obtain a higher defect amplitude. The ability of eddy current flaw detection system software to detect minimum defects.


According to the general law of eddy current testing, the sensitivity is generated in the area where the real part of the normalized characteristic impedance has a high value, that is, on the far right side of the horizontal portion of the characteristic impedance curve, because the eddy current loss matching this point is large. Signal-to-noise ratio (SNR) is the most important index value of credibility of hazard detection. When the signal-to-noise comparison is hour, the strength difference between the defect data signal and the noise is small, and it is difficult to set the alarm water gate between the two. Even if the threshold is set, it is very easy to cause misreporting or missing inspection, so that the automatic technology flaw detection is classified as unsuccessful. In other words, in add filling index suitable conditions, with defect vectors of the phase Angle changes in amplitude shift basis without harm, little imagine, when add filling index is hour (choose a camera test of small diameter stainless steel plate is attributable to such status), phase Angle changes of amplitude shift will be a significant harm. Phase difference is a key parameter in eddy current testing. It is of great practical significance to select the proper phase Angle for the accuracy of eddy current testing results. The phase Angle often referred to here is the myopia degree of the offset of the spatial vector of the data signal received by eddy current flaw detection.


The appropriate phase Angle can make the force difference between the human defect or natural defect and the noise greatly, so as to obtain the signal-to-noise ratio. However, in the whole process of specific inspection, the typical defects of the stainless steel sheet must be used to calibrate the eddy current flaw detection system software, according to the space vector of the typical defects to adjust the phase difference, so that the output of the data signal of the typical defects is large. In addition, with the change of the filling index, the phase Angle should be adjusted appropriately to obtain a higher defect amplitude. In other words, in add filling index suitable conditions, with defect vectors of the phase Angle changes in amplitude shift basis without harm, little imagine, when add filling index is hour (choose a camera test of small diameter stainless steel plate is attributable to such status), phase Angle changes of amplitude shift will be a significant harm. In eddy current testing, there are two key reasons for longitudinal defects to be missed. One is because of the use of self-differential protection electromagnetic coils. Differential protection electromagnetic coil although can be good to suppress the influence of slow change elements, such as seamless steel tube diameter and conductivity change, seamless steel tube transmission vibration caused by the camera gap change and the fluctuation of working temperature, but for fine longitudinal cracks and eliminate good external rolling, etc., is usually removed by differential signals; Another is the tendency of longitudinal cracks. In the application of cross type electromagnetic coil seamless steel tube flaw detection, the vortex on the surface of the seamless steel tube is circumferential flow, it is said that the longitudinal crack can greatly destroy all the normal flow of the vortex caused by the vortex, is very easy to be detected. It is unknown that the results are exactly the opposite. This is because although the vortex is very large in some areas of longitudinal cracks, it does not account for a large proportion in the whole inspection circle. Most of the areas inspected are all contributing to the noise, so the SNR is low.

危害渦流探傷主要參數的剖析

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