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Adaptive sound time calculation method in ultrasonic thickness measurement

A calculation method and self-adaptive technology, applied in the direction of using ultrasonic/sonic/infrasonic waves, measurement devices, radio wave measurement systems, etc., can solve the problems of difficulty in ensuring calculation accuracy and stability, and achieve improved calculation accuracy, accuracy and reliability. sexual effect

Active Publication Date: 2017-12-08
DALIAN UNIV OF TECH
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Problems solved by technology

[0006] The technical problem mainly solved by the invention is to overcome the deficiencies of existing methods, aiming at the problem that the calculation accuracy and stability of ultrasonic sound time with low signal-to-noise ratio in ultrasonic thickness measurement are difficult to guarantee, and an adaptive sound time calculation in ultrasonic thickness measurement is invented. method

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  • Adaptive sound time calculation method in ultrasonic thickness measurement

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with specific embodiments and related drawings.

[0039] The embodiment of the present invention adopts such as figure 1 The shown calculation flow chart of ultrasonic thickness measurement uses an ultrasonic probe with a center frequency of 10MHz for ultrasonic transmission and reception, and the acquisition frequency of ultrasonic signals is 2.5GHz. Ultrasonic thickness measurement was carried out on 6 aluminum alloy specimens of different thicknesses. The actual thickness of the specimens was measured by a coordinate machine as shown in Table 1.

[0040] Table 1 CMM measurement results of the thickness of each specimen

[0041]

[0042] The present invention will be further described in detail through the sound time measurement method of a specimen with a thickness of 6 mm.

[0043] The first step is acquisition and preprocessing of ultrasonic echo signals. The acquired ultrasonic pulse echo signal is li...

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Abstract

An adaptive sound time calculation method in ultrasonic thickness measurement belongs to the ultrasonic detection technology field, and the present invention especially relates to an adaptive sound time calculation method in ultrasonic thickness measurement. In the method, the sound time calculation is converted to a system identification problem, two adjacent pulse echoes are taken as input signals and desired signals, the improved variable step size adaptive algorithm is used in the iteration process, the proportion, integration and differential of output error power form a step integrated control function to reduce the noise influence and more accurately obtain the pulse response sequence of adjacent echo signals; and the pulse response sequence is subjected to segment fitting and first derivation processing to obtain the maximum value position of the pulse response sequence, and ultrasonic sound time is obtained through conversion of the horizontal ordinate of the maximum value of the pulse response sequence. The adaptive sound time calculation method in ultrasonic thickness measurement effectively reduces the influence of interference noise in the ultrasonic thickness measurement, realizes the stable and high-precision calculation of the sound time and substantially improves the precision of the ultrasonic thickness measurement.

Description

Technical field [0001] The present invention relates to the technical field of ultrasonic testing, in particular to an adaptive acoustic time calculation method in ultrasonic thickness measurement. Background technique [0002] Ultrasonic thickness measurement is widely used in the wall thickness detection of key components in aerospace and other fields. Ultrasonic thickness measurement mainly uses the principle of pulse reflection. The ultrasonic waves emitted by the ultrasonic probe reflect back and forth between the upper and lower surfaces of the workpiece to be tested to form a series of pulse echoes, which are received by the ultrasonic probe. The thickness of the workpiece to be measured is calculated when the sound propagation of the pulse echo in the workpiece is used. Therefore, the accuracy of acoustic time calculation is a key link that affects the accuracy of thickness measurement. However, the collected ultrasonic echo signal often contains complex interference n...

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Application Information

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IPC IPC(8): G01S7/539G01B17/02
CPCG01B17/02G01S7/539
Inventor 王永青周连杰刘海波廉盟应杨威李亚鹏贾振元
Owner DALIAN UNIV OF TECH
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