CN102879480A - Method for delaying self-adaptive ultrasonic phased array wedge - Google Patents

Method for delaying self-adaptive ultrasonic phased array wedge Download PDF

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CN102879480A
CN102879480A CN2012103460421A CN201210346042A CN102879480A CN 102879480 A CN102879480 A CN 102879480A CN 2012103460421 A CN2012103460421 A CN 2012103460421A CN 201210346042 A CN201210346042 A CN 201210346042A CN 102879480 A CN102879480 A CN 102879480A
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time
phased array
ultrasonic phased
voussoir
delay
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CN102879480B (en
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王强
肖琨
胡栋
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China Jiliang University
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China Jiliang University
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Abstract

The invention discloses a kind of methods of self-adapting ultrasonic phased array voussoir delay. Present invention application ultrasonic phased array detection device carries out non-destructive testing workpiece, after equipment relative parameters setting, obtains the time of voussoir delay
Figure 2012103460421100004DEST_PATH_IMAGE002
With the probe beginning wave end time
Figure 2012103460421100004DEST_PATH_IMAGE004
, and remove in the detection process amplitude be lower than lower limit threshold value signal, using rolling average algorithm smoothly get [
Figure DEST_PATH_IMAGE006
,
Figure DEST_PATH_IMAGE008
] echo-signal in range, and the peak value of echo-signal and the time where peak value in this period are detected, which is newly defined as , achieve the purpose that self-adapting ultrasonic phased array voussoir is delayed. Present invention combination phase-controlled ultrasonic wave imaging technique removes the echo-signal generated due to systematic error in the actually detected image of ultrasonic phased array, be conducive to testing staff to the differentiation of flaw indication, improve recall rate.

Description

A kind of method of self-adapting ultrasonic phased array voussoir time-delay
Technical field
The present invention relates to the ultrasonic phased array field of non destructive testing, relate in particular to a kind of method of self-adapting ultrasonic phased array voussoir time-delay.
Background technology
The ultrasonic phased array Dynamic Non-Destruction Measurement plays an important role in the modern industry Non-Destructive Testing, has great application prospect.In the ultrasonic phased array Non-Destructive Testing, often need to below probe, voussoir be installed, to reach the purpose of using the ultrasound wave far-field region to detect and make ultrasonic beam generation certain angle initial deflection.Because ultrasound wave is propagated in voussoir and needed the regular hour equally, need to measure during this period of time detecting when beginning, namely to the voussoir delay calibration of ultrasonic phased array pick-up unit.Yet because voussoir is in use particularly in a lot of online application that detect, can constantly produce wearing and tearing, in case voussoir produces relatively large wearing and tearing, and can not in time time-delay re-starts calibration to voussoir the time, will make the location to tested inside workpiece defective error occur.
In order to address the above problem, improve the bearing accuracy of ultrasonic phased array Non-Destructive Testing, the present invention proposes a kind of method of self-adapting ultrasonic phased array voussoir time-delay, the method only need to be carried out one time the voussoir delay calibration when the ultrasonic phased array detector is started working, just can in follow-up use, constantly automatically calculate the voussoir time-delay, thereby reach the purpose of self-adapting ultrasonic phased array voussoir time-delay.
Summary of the invention
The objective of the invention is to improve the deficiencies in the prior art, a kind of method of self-adapting ultrasonic phased array voussoir time-delay is provided.
A kind of method step of self-adapting ultrasonic phased array voussoir time-delay is as follows:
Step 1: at ultrasonic phased array pick-up unit main frame probe and voussoir are installed, the ultrasonic phased array pick-up unit is carried out sound velocity calibration, voussoir delay calibration, sensitivity calibration and encoder calibration;
Step 2: arrange the ultrasonic phased array pick-up unit time-delay rule, focus on rule, gain, inhibition, initial, scope, the velocity of sound, voltage, average, scale, thickness of workpiece, workpiece material, detecting pattern, the depth of focus, probe type, probe array number, frequency probe and beam type;
Step 3: according to the voussoir delay calibration program in the step 1, obtain the time of voussoir time-delay
Figure 28649DEST_PATH_IMAGE001
With probe ripple concluding time beginning
Figure 2012103460421100002DEST_PATH_IMAGE002
Step 4: remove the signal that some amplitudes are lower than the lower limit threshold value, adopt formula as follows:
Figure 446992DEST_PATH_IMAGE003
，k∈[1,N]
Wherein
Figure 2012103460421100002DEST_PATH_IMAGE004
, For time range [
Figure 2012103460421100002DEST_PATH_IMAGE006
,
Figure 738743DEST_PATH_IMAGE007
] in the echoed signal obtained,
Figure 2012103460421100002DEST_PATH_IMAGE008
Be the reference amplitude of logarithmic coordinate system,
Figure 557663DEST_PATH_IMAGE009
Be the lower limit threshold value, Be treated echoed signal, N is the number that comprises numerical value among the x, and k is index;
Step 5: use the moving average algorithm, treated echoed signal in the step 4 is carried out smoothing processing, the expression formula of moving average algorithm is as follows:
Figure 396175DEST_PATH_IMAGE011
，k∈[1,N-n+1]
Wherein, x be time range [
Figure 441491DEST_PATH_IMAGE002
,
Figure 961334DEST_PATH_IMAGE001
] in the echoed signal obtained, y is for through the echoed signal after the smoothing processing, N is the number that comprises numerical value among the x, n is each average number of using numerical value in the moving average algorithm, k is index;
Step 6: detection signal y time range [
Figure 510127DEST_PATH_IMAGE002
,
Figure 598169DEST_PATH_IMAGE001
] in maximal value and the time at maximal value place, and think that this time is new ultrasonic phased array voussoir delay time, and with this time redefine into
Figure 865202DEST_PATH_IMAGE001
Step 7: in ultrasonic phased array Non-Destructive Testing process, repeating step four constantly obtains new ultrasonic phased array voussoir delay time to step 6
Figure 1786DEST_PATH_IMAGE001
, reach the purpose that self-adapting ultrasonic phased array voussoir is delayed time.
Beneficial effect of the present invention: the present invention is in conjunction with the ultrasonic phased array Dynamic Non-Destruction Measurement, extract the voussoir time delayed signal that comprises in the echoed signal, only need to when starting working, the ultrasonic phased array detector carry out one time the voussoir delay calibration, just can in follow-up use, constantly adapt to the time-delay that brings owing to the voussoir wearing and tearing, thereby improve the bearing accuracy to tested inside workpiece defective.
Description of drawings
Fig. 1 is that the peak value of the method for a kind of self-adapting ultrasonic phased array voussoir time-delay of the present invention detects synoptic diagram.
Embodiment
Provide embodiments of the invention below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:
Step 1: probe and voussoir are installed at ultrasonic phased array pick-up unit main frame, the ultrasonic phased array pick-up unit is carried out sound velocity calibration, voussoir delay calibration, sensitivity calibration and encoder calibration, ultrasonic phased array pick-up unit main frame model is OMNISCAN MX in this example, the probe model is 5L64-A2, and the voussoir model is SA2-N55S;
Step 2: the time-delay rule that the ultrasonic phased array pick-up unit is set, focus on rule, gain, suppress, initial, scope, the velocity of sound, voltage, on average, scale, thickness of workpiece, workpiece material, detecting pattern, the depth of focus, the probe type, the probe array number, frequency probe and beam type adopt sector display in this example, gain-16dB, suppress 0%, initial 0mm, scope 150mm, velocity of sound 3230m/s, voltage 80V, average 1 time, thickness of workpiece 110mm, workpiece material is carbon steel, depth of focus 200mm, the probe type is longitudinal wave probe, probe array number 64, frequency probe 5MHz, 55 ° of shear waves detect;
Step 3: according to the voussoir delay calibration program in the step 1, obtain the time of voussoir time-delay
Figure 405085DEST_PATH_IMAGE001
With probe ripple concluding time beginning
Figure 850979DEST_PATH_IMAGE002
, in this example
Figure 2012103460421100002DEST_PATH_IMAGE012
,
Figure 542991DEST_PATH_IMAGE013
Step 4: remove the signal that some amplitudes are lower than the lower limit threshold value, adopt formula as follows:
Figure 280003DEST_PATH_IMAGE003
，k∈[1,N]
Wherein , For time range [
Figure 333913DEST_PATH_IMAGE006
,
Figure 874616DEST_PATH_IMAGE007
] in the echoed signal obtained,
Figure 705037DEST_PATH_IMAGE008
Be the reference amplitude of logarithmic coordinate system,
Figure 40204DEST_PATH_IMAGE009
Be the lower limit threshold value,
Figure 769125DEST_PATH_IMAGE010
Be treated echoed signal, N is the number that comprises numerical value among the x, and k is index;
Step 5: use the moving average algorithm, treated echoed signal in the step 4 is carried out smoothing processing, the expression formula of moving average algorithm is as follows:
，k∈[1,N-n+1]
Wherein, x be time range [ ,
Figure 976619DEST_PATH_IMAGE001
] in the echoed signal obtained, y is for through the echoed signal after the smoothing processing, N is the number that comprises numerical value among the x, n is each average number of using numerical value in the moving average algorithm, k is index;
Step 6: as shown in Figure 1, may wear to voussoir to a certain degree in this example after, detection signal y time range [ ,
Figure 13025DEST_PATH_IMAGE001
] in maximal value and the time at maximal value place, detect this time to be approximately
Figure 2012103460421100002DEST_PATH_IMAGE014
, and think that this time is new ultrasonic phased array voussoir delay time, and with this time redefine into
Figure 558319DEST_PATH_IMAGE001
, namely
Figure 500867DEST_PATH_IMAGE015
Step 7: in ultrasonic phased array Non-Destructive Testing process, repeating step four constantly obtains new ultrasonic phased array voussoir delay time to step 6 , reach the purpose that self-adapting ultrasonic phased array voussoir is delayed time.

Claims (1)

1. the method for self-adapting ultrasonic phased array voussoir time-delay is characterized in that the method may further comprise the steps:
Step 1: at ultrasonic phased array pick-up unit main frame probe and voussoir are installed, the ultrasonic phased array pick-up unit is carried out sound velocity calibration, voussoir delay calibration, sensitivity calibration and encoder calibration;
Step 2: arrange the ultrasonic phased array pick-up unit time-delay rule, focus on rule, gain, inhibition, initial, scope, the velocity of sound, voltage, average, scale, thickness of workpiece, workpiece material, detecting pattern, the depth of focus, probe type, probe array number, frequency probe and beam type;
Step 3: according to the voussoir delay calibration program in the step 1, obtain the time of voussoir time-delay
Figure 2012103460421100001DEST_PATH_IMAGE002
With probe ripple concluding time beginning
Figure 2012103460421100001DEST_PATH_IMAGE004
Step 4: remove the signal that some amplitudes are lower than the lower limit threshold value, adopt formula as follows:
Figure 2012103460421100001DEST_PATH_IMAGE006
，k∈[1,N]
Wherein
Figure DEST_PATH_IMAGE008
, For time range [
Figure DEST_PATH_IMAGE012
,
Figure DEST_PATH_IMAGE014
] in the echoed signal obtained,
Figure DEST_PATH_IMAGE016
Be the reference amplitude of logarithmic coordinate system,
Figure DEST_PATH_IMAGE018
Be the lower limit threshold value,
Figure DEST_PATH_IMAGE020
Be treated echoed signal, N is the number that comprises numerical value among the x, and k is index;
Step 5: use the moving average algorithm, treated echoed signal in the step 4 is carried out smoothing processing, the expression formula of moving average algorithm is as follows:
Figure DEST_PATH_IMAGE022
，k∈[1,N-n+1]
Wherein, x be time range [
Figure 796655DEST_PATH_IMAGE004
,
Figure 567033DEST_PATH_IMAGE002
] in the echoed signal obtained, y is for through the echoed signal after the smoothing processing, N is the number that comprises numerical value among the x, n is each average number of using numerical value in the moving average algorithm, k is index;
Step 6: detection signal y time range [
Figure 816749DEST_PATH_IMAGE004
,
Figure 739706DEST_PATH_IMAGE002
] in maximal value and the time at maximal value place, and think that this time is new ultrasonic phased array voussoir delay time, and with this time redefine into
Figure 49464DEST_PATH_IMAGE002
Step 7: in ultrasonic phased array Non-Destructive Testing process, repeating step four constantly obtains new ultrasonic phased array voussoir delay time to step 6
Figure 307139DEST_PATH_IMAGE002
, reach the purpose that self-adapting ultrasonic phased array voussoir is delayed time.
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CN104359982A (en) * 2014-11-19 2015-02-18 哈尔滨工业大学 Method for ultrasonic phased array detection of sheet weld joint by wedge block
CN106796204A (en) * 2015-04-16 2017-05-31 运输技术中心公司 System for checking track with phased-array ultrasonic
CN106908522A (en) * 2017-02-16 2017-06-30 山东省特种设备检验研究院泰安分院 The ultrasonic guided wave detecting of defect of pipeline axial width demarcates sample pipe and scaling method
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CN106908522A (en) * 2017-02-16 2017-06-30 山东省特种设备检验研究院泰安分院 The ultrasonic guided wave detecting of defect of pipeline axial width demarcates sample pipe and scaling method
CN106908522B (en) * 2017-02-16 2021-05-07 泰安市特种设备检验研究院 Ultrasonic guided wave detection calibration sample pipe for axial width of pipeline defect and calibration method
CN110988853A (en) * 2019-12-23 2020-04-10 中煤科工集团重庆研究院有限公司 Ultrasonic arrival time calculation method based on effective peak value

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