Electromagnetic ultrasonic metal material thickness measurement method

An electromagnetic ultrasonic and metal material technology, applied in the direction of using ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problems of propagation time error, the appearance time of ultrasonic echo peak is not fixed, etc., to achieve low cost and high detection efficiency. , the effect of a wide range of applications

Active Publication Date: 2015-12-23
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

Due to the irregularity of the electromagnetic ultrasonic waveform and the different properties of the metal mater...

Method used

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  • Electromagnetic ultrasonic metal material thickness measurement method
  • Electromagnetic ultrasonic metal material thickness measurement method
  • Electromagnetic ultrasonic metal material thickness measurement method

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specific Embodiment approach 1

[0029] Specific implementation mode 1: An electromagnetic ultrasonic metal material thickness measurement method in this implementation mode includes:

[0030] Step 1, electromagnetic ultrasonic emission as shown in Figure 1;

[0031] Step 2, electromagnetic ultrasonic reception as shown in Figures 2 and 3;

[0032] Electromagnetic ultrasonic reception obtains the first zero-crossing point or the first peak point by receiving the electromagnetic ultrasonic transmission signal, and finally obtains the ultrasonic propagation time T to calculate the thickness of the metal material Among them, the electromagnetic ultrasonic receiving echo pulse train contains periodic pulse signals of two or more frequencies; the ultrasonic propagation time is calculated based on the initial zero-crossing point or first peak point of the first cycle in the periodic pulse signals of two frequencies, Specific steps are as follows:

[0033] Step 1. Determine the initial zero-crossing point of the ...

specific Embodiment approach 2

[0047] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the electromagnetic ultrasonic emission described in step one is specifically:

[0048] The electromagnetic ultrasonic emission burst pulse train of electromagnetic ultrasonic emission contains periodic pulse signals of two or more frequencies, and the frequencies are f 1 , f 2  … f i ;According to the order of emission time, the electromagnetic ultrasonic emission burst contains continuous N 1 f 1 Pulse signal, continuous N 2 f 2 Pulse signal...continuous N i f i The pulse signal N 1 ≥1,N 2 ≥1,N i ≥0, where i>2; wherein, the waveform of the pulse signal emitted by the electromagnetic ultrasonic wave is a pulse wave with any duty ratio.

specific Embodiment approach 3

[0049] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the method for calculating the ultrasonic propagation time of periodic pulse signals with two or more frequencies is the same as the method for calculating the ultrasonic propagation time of periodic pulse signals with two frequencies.

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Abstract

The invention provides an electromagnetic ultrasonic metal material thickness measurement method, which belongs to the field of metal material thickness measurement. The electromagnetic ultrasonic metal material thickness measurement method aims to avoid problems of low efficiency of electromagnetic ultrasonic energy conversion, unfixed occurrence moments of peak points of electromagnetic ultrasonic echoes and low thickness measurement accuracy. The specific electromagnetic ultrasonic metal material thickness measurement method comprises the steps that: an electromagnetic ultrasonic emitting tone burst pulse string and an electromagnetic ultrasonic receiving echo pulse string each comprises pulse signals of two or more kinds of frequencies, each pulse string comprises N1 consecutive pulse signals of frequency f1, N2 consecutive pulse signals of frequency f2, ...and Ni consecutive pulse signals of frequency fi, and N1 is greater than or equal to 1, N2 is greater than or equal to 1, and Ni is greater than or equal to 0; the time of a first cyclic wave cyclic wave initial zero-crossing point A or an initial peak point B of the pulse string of frequency f1 is obtained according to sequences of emission time and reception time, the time interval between the time of the first cyclic wave cyclic wave initial zero-crossing point A or the initial peak point B and the time of an initial emission point is the ultrasonic transmission time, and the thickness of metal materials is obtained through calculation. The electromagnetic ultrasonic metal material thickness measurement method is used for detecting thickness of metal materials.

Description

technical field [0001] The invention relates to the field of thickness measurement of metal materials, in particular to an electromagnetic ultrasonic thickness measurement method for metal materials. Background technique [0002] Due to the limitation of processing technology in the production process, metal materials will inevitably have uneven thickness, and in the process of use, thickness changes will also occur due to factors such as stress and corrosion. Accurate measurement of thickness is an important means to ensure the quality and performance of metal materials. At present, the traditional piezoelectric ultrasonic technology is widely used for thickness measurement, but the characteristics of the couplant required for piezoelectric ultrasonic technology not only limit the detection efficiency and application range of ultrasonic, but also the detection cost is high. [0003] Electromagnetic ultrasonic technology does not require couplant and is a non-contact measur...

Claims

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Application Information

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IPC IPC(8): G01B17/02
Inventor 翟国富李永虔汪开灿蒋川流赵辉孙峥杨金旭贾文斌李策
Owner HARBIN INST OF TECH
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