A Method of Improving the Accuracy of Electromagnetic Ultrasonic Detection
An electromagnetic ultrasonic and ultrasonic technology, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, and measuring devices to improve detection accuracy and improve detection accuracy.
Active Publication Date: 2017-05-10
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method for improving the accuracy of electromagnetic ultrasonic detection, using the non-equal-amplitude series pulse excitation calibration method, to obtain the magnetic permeability, electrical conductivity, and uneven surface of metal in electromagnetic ultrasonic detection. The relative change law of the amplitude of the ultrasonic bottom wave signal of the workpiece is used to suppress the signal attenuation caused by the magnetic permeability, electrical conductivity, and surface state changes in the electromagnetic ultrasonic detection signal, and the equivalent compensation corrects the ultrasonic defect echo signal amplitude during actual detection. value
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[0022] Examples such as figure 1 , figure 2 , image 3 As shown, a method for improving the accuracy of electromagnetic ultrasonic detection of the present invention adopts a non-equal-amplitude series pulse excitation calibration method to obtain the ultrasonic bottom wave signal amplitude of magnetic permeability or electrical conductivity or a metal workpiece with uneven surface in electromagnetic ultrasonic detection. In order to suppress the signal attenuation caused by the change of the three parameters of magnetic permeability or electrical conductivity or surface state in the electromagnetic ultrasonic detection signal, the equivalent compensation corrects the amplitude of the ultrasonic defect echo signal in the actual detection, and improves the detection efficiency. Accuracy, the method has two processes of calibration and actual measurement,
[0023] The calibration process is,
[0024] a. Make a comparison sample, which is exactly the same in material and shap...
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The invention discloses a method for improving electromagnetic ultrasonic detection precision. By adopting an unequal amplitude serial pulse excitation calibration method, a relative change rule of an ultrasonic bottom wave signal amplitude of a metal workpiece with magnetic conductivity, conductivity and non-uniform surface in electromagnetic ultrasonic detection is obtained so as to inhibit signal attenuation caused by changes of magnetic conductivity, conductivity and surface state in an electromagnetic ultrasonic detection signal, so that an ultrasonic defect echo signal amplitude in actual detection is equivalently compensated and corrected and the detection accuracy is improved.
Description
[0001] Technical field [0002] The invention relates to a nondestructive testing method, in particular to a method for improving the precision of electromagnetic ultrasonic testing. Background technique [0003] Unlike the conventional ultrasonic testing technology where the transducer relies on the piezoelectric effect of the piezoelectric chip to transmit and receive ultrasonic waves, the transducer in the electromagnetic ultrasonic testing technology relies on the electromagnetic effect to transmit and receive ultrasonic waves. When the eddy current coil placed on the surface of the workpiece passes high-frequency current, an eddy current is generated in the skin surface layer of the workpiece, and the eddy current will generate high-frequency vibration under the action of an external magnetic field, forming an ultrasonic wave source. When receiving ultrasonic waves, the vibration on the surface of the workpiece will also induce a voltage in the eddy current coil under the...
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IPC IPC(8): G01N29/04G01N29/30
Inventor 林俊明
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD