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WO2011108855A2 - Appareil destiné à imager une propagation par ultrasons anormale - Google Patents

Appareil destiné à imager une propagation par ultrasons anormale Download PDF

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Publication number
WO2011108855A2
WO2011108855A2 PCT/KR2011/001453 KR2011001453W WO2011108855A2 WO 2011108855 A2 WO2011108855 A2 WO 2011108855A2 KR 2011001453 W KR2011001453 W KR 2011001453W WO 2011108855 A2 WO2011108855 A2 WO 2011108855A2
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WO
WIPO (PCT)
Prior art keywords
ultrasound
laser beam
laser
malformed
ultrasonic wave
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2011/001453
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English (en)
Korean (ko)
Other versions
WO2011108855A3 (fr
Inventor
이정률
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Industry Academic Cooperation Foundation of Chonbuk National University
Original Assignee
Industry Academic Cooperation Foundation of Chonbuk National University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Industry Academic Cooperation Foundation of Chonbuk National University filed Critical Industry Academic Cooperation Foundation of Chonbuk National University
Publication of WO2011108855A2 publication Critical patent/WO2011108855A2/fr
Publication of WO2011108855A3 publication Critical patent/WO2011108855A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/24—Probes
    • G01N29/2418—Probes using optoacoustic interaction with the material, e.g. laser radiation, photoacoustics
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
    • G01N29/0654—Imaging

Definitions

  • the present invention relates to a malformed ultrasonic wave imaging apparatus, and more particularly, to a malformed ultrasonic wave imaging apparatus capable of quantifying the size of damage and fabrication defects in complex structures and components that are difficult to analyze in simple ultrasonic wave imaging.
  • 3D ultrasound propagation imaging is an ultrasound imaging technique that makes it possible to visualize changes over time, ie, propagation patterns, of acoustic ultrasonic waves in 2D space by adding a time axis to 2D spatial information.
  • Ultrasonic imaging devices are not capable of remote measurement or curved structure scanning, and require excessive inspection time or low spatial resolution due to the laser head scanning method and slow irradiation repetition rate.
  • An object of the present invention is to solve the problems of the prior art as described above, the size of the damage in a complex structure that is difficult to analyze in a simple ultrasound image by removing the ultrasonic waves propagating normally and only three-dimensional imaging of the ultrasonic waves of malformed propagation characteristics It is to provide a malformed ultrasonic wave imaging apparatus for quantifying.
  • a malformed ultrasonic wave imaging apparatus includes a laser irradiation unit for repeatedly irradiating a laser beam having a specific duration, a beam expander for adjusting a focus to irradiate a laser beam to an object, and A two-axis laser mirror scanner that allows the laser beam to be irradiated along the path of the laser beam irradiation point within the inspection region, a sensor for detecting ultrasonic waves generated by the object irradiated with the laser beam, an amplifier for amplifying the ultrasonic signal detected by the sensor; A first image processing controller including a band pass filter that removes noise present in an ultrasound signal and passes only a specific frequency band in the ultrasound signal, and removes a direct wave generated when there is no defect in the received ultrasound from inside the object.
  • the second image processing controller may include a third image processing controller configured to reconstruct a three-dimensional ultrasonic structure using the extracted malformed ultrasonic waves, and an output unit configured to output a three-dimensional ultrasonic structure generated from the third image processing controller.
  • the laser irradiation unit is characterized in that the Q-switch CW laser and the Q-switch CW laser irradiates a laser beam having a duration of 10ps to 900 ns at a repetition rate of 10Hz to 10KHz, the irradiation output may be 0.1mJ to 99mJ.
  • the beam expander includes a microscope lens and a focusing lens, and the expansion ratio of the microscope lens may be determined in consideration of the beam diameter of the laser beam, the mirror size of the biaxial laser mirror scanner, and the expansion ratio of the microscope lens capable of refocusing.
  • the lens damage limit of the microscope lens and the focusing lens can be determined by the output per unit area of the laser beam.
  • the sensor may be used as two types of contact type attached to the object or non-contact type spaced apart from the object.
  • Non-contact sensors can use a laser beam or air as the medium.
  • the laser ultrasonic receiver combines the ultrasonic wave generation laser beam and the receiving laser beam on the same laser beam path or by using a plurality of laser mirror scanners to match the laser beam irradiation point with the point where the sensor detects the ultrasonic wave.
  • Short distance in-plane by detecting out-of-plane propagation waveform transmitted in the thickness direction of the object or by scanning while keeping the laser beam irradiation point and the sensor sensing ultrasonic wave at the same distance It can be used to detect propagation waveforms.
  • the second image processing controller reads out the first ultrasonic wave detected at the first irradiation point among the laser beam irradiation points and the second ultrasonic wave detected at an adjacent second irradiation point for calculation in accordance with the scanning direction.
  • the output unit may divide the 3D ultrasound structure generated from the third image processing controller according to time and continuously output the magnitude of the amplitude in space on a color or gray scale.
  • this basic configuration is connected with a camera, a two-axis laser mirror scanner for remotely checking the object when performing a remote scanning test, and the two-axis laser mirror scanner is located beyond the limit of the angle to which the laser beam can be irradiated It can be configured by adding a hollow motor rotator to direct the located object to the exit of the two-axis laser mirror scanner.
  • the hollow motor rotator may include a hollow part through which the laser beam oscillated from the laser irradiation part may pass, and a rotating part to rotate according to a direction in which the laser beam is irradiated.
  • ultrasonic waves generated in the object can be remotely collected at high speed with high reproducibility.
  • the simple wave propagation image is removed by eliminating the direct wave propagating normally and three-dimensional imaging of only the ultrasonic wave with the malformed propagation characteristics such as the dispersed wave or the isolated wave. It has the effect of quantifying the size of damage in complex structures that are difficult to analyze.
  • FIG. 1 is a schematic block diagram of a malformed ultrasonic wave imaging apparatus according to an embodiment of the present invention.
  • FIG. 2 is a photograph of a composite wing specimen with impact damage to which the malformed ultrasonic wave imaging apparatus according to an embodiment of the present invention is applied.
  • FIG. 3 is a result of a simple ultrasonic wave imaging of the outer surface of the composite wing shown in FIG.
  • FIG. 4 is a malformed ultrasonic wave image obtained by imaging the outer surface of the composite wing shown in FIG. 2 (a) using the malformed ultrasonic wave imaging apparatus of the present invention.
  • FIG. 5 is a path in which a laser beam is scanned and irradiated onto an object by a laser mirror scanner according to an exemplary embodiment.
  • FIG. 6 illustrates ultrasonic waveforms (y i (t) and y i + 1 (t)) acquired at a vertical or horizontally adjacent i-th and i + 1-th irradiation point detected by a sensor according to an embodiment of the present invention. This is the result showing the difference between the two waveforms to minimize the difference between the two waveforms (y i + 1 -y i ) is a result of placing the time axis at the depth of the i-th irradiation point.
  • FIG. 7 is a flowchart of imaging a malformed ultrasonic wave propagation image.
  • FIG. 8 is a graph showing results of acquiring a difference between two waveforms by moving one of ultrasonic waves y i (t) and y i + 1 (t) acquired at two horizontally or vertically adjacent irradiation points by a sampling interval. .
  • FIG. 9 is a three-dimensional ultrasound structure obtained by using a waveform representing the difference (y i + 1 -y i ) of the two minimized waveforms at a specific time to output the magnitude of the amplitude in a color scale in space This is a malformed ultrasound image and measured image after amplitude appearance.
  • 10 is an example of the configuration of a mobile type device that performs malformed ultrasonic propagation imaging in a completely non-contact manner.
  • FIG. 11 is an example of device configuration in a hangar stationary and mobile format that performs malformed ultrasound propagation imaging in contact and non-contact.
  • FIG. 1 is a schematic block diagram of a malformed ultrasonic wave imaging apparatus according to an embodiment of the present invention.
  • the malformed ultrasonic wave imaging apparatus 100 may include a laser irradiator 120, a beam expander 160, a biaxial laser mirror scanner 130, a sensor 140, and an image. It includes a processing control unit 150.
  • the Q-switch CW laser 120 irradiates the laser beam at a repetition rate of 10 Hz to 10 kHz.
  • the irradiated laser beam may have a pulse-to-pulse instability (standard deviation / average) of 2% or less, and energy may range from 1 mJ (millijoule) to several tens of mJ, preferably 0.1 mJ, of ultrasonic waves generated in the object 110. It can be adjusted to the region of 99mJ, the duration of the laser beam irradiation can be adjusted from several tens of picoseconds to several hundred nanoseconds.
  • the beam expander 160 is composed of a microscope lens and a coating that prevents the damage of the lens in consideration of the irradiation power and the wavelength of the laser beam and the focusing lens which can be moved back and forth and focus.
  • the expansion ratio of the microscope lens is adjusted from 10 times to 20 times, and the expansion ratio is determined in consideration of whether the beam diameter of the laser irradiation unit 120 and the mirror diameter and focus of the biaxial laser mirror scanner 130 can be readjusted.
  • the biaxial laser mirror scanner 130 includes a biaxial rotating part driven by a galvanomotor (galvano) to direct the laser beam irradiated from the laser irradiator 120 to the object 110.
  • the laser beam is irradiated along the scanning pass, as shown in FIG. 5.
  • Ultrasonic signals generated and detected by the laser beam irradiated along the scanning path are shown in FIG. 6.
  • the scanning path draws a specific pattern such as using an orthogonal coordinate system or an angular coordinate system according to the object 110, or adjusting a scan interval constantly or stepwise.
  • the scanning pass may be repeatedly performed several times to average the signals obtained at the same irradiation point, thereby greatly improving the signal-to-noise ratio.
  • the sensor 140 is provided in the object 110 and includes a band pass filter and an amplifier, and ultrasonic waves generated by irradiating a laser beam to the object 110 are in-plane or out-of-object of the object 110.
  • -plane detects one-dimensional ultrasound after propagating a certain distance.
  • One-dimensional ultrasound waves are signals made of amplitude of time zone ultrasound waves as shown in FIG. 6.
  • the one-dimensional ultrasonic signal sensed by the sensor 140 has a different amplitude and propagation time depending on the laser beam irradiation point.
  • a band pass filter and an amplifier connected to the sensor 140 remove the signal amplification and noise, and pass through a specific frequency band to extract the corrected one-dimensional ultrasonic signal.
  • the senor 140 is a piezoelectric material-based ultrasonic sensor (ceramic, single crystal, Air-coupled transducer, Macro fiber composite, Polyvinylidene fluoride), electromagnetic ultrasonic transducer (Electro-magnetic acoustic transducer), laser interferometer based ultrasonic It can be composed of any one of a sensor (Laser Doppler vibrometer, Laser ultrasonic multidetector receiver), Capacitance transducer or fiber optic ultrasonic sensors (FBG, Sagnac, EFPI).
  • the sensor 140 may be provided in plurality in contact or non-contact.
  • FIG. 2 is a photograph of a composite wing specimen having impact damage to which a malformed ultrasonic wave imaging apparatus according to an embodiment of the present invention is applied
  • FIG. 3 is a simple ultrasonic wave imaging of the outer surface of the composite wing illustrated in FIG.
  • One result. 4 is a malformed ultrasonic wave image obtained by imaging the outer surface of the composite wing shown in FIG. 2 (a) using the malformed ultrasonic wave imaging apparatus of the present invention.
  • FIG. 7 is a flowchart of imaging a malformed ultrasound wave image.
  • FIG. 8 shows two waveforms while moving one of ultrasonic waves y i (t) and y i + 1 (t) acquired at two adjacent irradiation points by a sampling interval. It is a graph of the result of obtaining the difference.
  • the ultrasonic waves measured at two adjacent irradiation points have little difference between the waveform and the arrival time, as shown in FIG. 8 (b), one of the signals acquired at two adjacent irradiation points is moved by the sampling interval, and then, as shown in FIG. ), The difference between the two signals is calculated for each sampling point.
  • the ultrasonic waves propagating normally are very small and the ultrasonic waves propagating abnormally are measured with relatively large amplitudes. .
  • y i + 1 (t) and y i (t) which coincide with the adjacent scanning directions obtained in FIG. 6, are read (S111).
  • the waveforms of y i + 1 (t) and y i (t) read are the same as those in FIGS. 8A and 8C.
  • y i + 1 (t) is the, 8 to move (S112) a waveform with the sampling interval ( ⁇ t) (b) is y i + Move the y i + 1 (t) to the ⁇ t time left as the sampling interval A waveform of 1 (t + ⁇ t) is shown.
  • FIG. 8 (d) A waveform representing the difference of y i (t) at y i + 1 (t + ⁇ t) is shown in FIG. 8 (d). In this way, the signals acquired at two adjacent irradiation points are shifted left and right by a multiple of the sampling interval and the difference between the two signals is obtained.
  • the signal processing of S111 to S114 is repeated for two adjacent waveforms perpendicular to the scanning direction (S115).
  • S115 the signal processing of S111 to S114 is repeated for two adjacent waveforms perpendicular to the scanning direction (S115).
  • S115 By combining the signals processed in both directions to position y as shown in Figure 6 to obtain y i and to generate a three-dimensional ultrasound structure using the waveforms obtained in the same way to other irradiation points (S116) a specific time In S117, the amplitude distribution corresponding to the inspection region is continuously output (S117) using a color or gray scale along the time axis, thereby obtaining a malformed ultrasound propagation image.
  • FIG. 9 is a process and result of imaging a spatially malformed ultrasonic wave at a specific time in a three-dimensional ultrasonic structure generated according to the algorithm for imaging the malformed ultrasonic wave of FIG. 7.
  • the above-mentioned malformed wave propagation imaging algorithm does not include damage, but only the residual wave of noise level is left due to the similarity of two adjacent waves as shown in FIG. 9 (a), but includes damage as shown in FIG. 9 (b).
  • Incident and scattered waves continue to propagate out of the scan area with attenuation, while isolated waves are generated by direct waves and appear late in time compared to direct and scattered waves, and are isolated from the damaged area. Because it provides direct information about the damage. Using this, the magnitude of the damage is evaluated by outputting the magnitude of the amplitude after the appearance of the isolated wave in two dimensions as shown in FIG. 9 (d).
  • Ultrasonic Generation in a Single Laser Mirror Scanner Ultrasound is the thickness of an object by combining a laser beam and a receiving laser beam on the same laser beam path, or by matching multiple laser mirror scanners to the point where the laser beam irradiation point and the sensor detect the ultrasound.
  • Short distance in-plane propagation waveforms can be detected by detecting out-of-plane propagation waveforms transmitted in the direction or by scanning while keeping the laser beam irradiation point and the sensor detecting ultrasonic waves at the same distance. Can be used to detect.
  • FIG. 11 is an example of device configuration in a hangar stationary and mobile format that performs malformed ultrasound propagation imaging in contact and non-contact.
  • the malformed ultrasonic wave imaging apparatus may be configured as a mobile device as shown in FIG. 10.
  • an automatic inspection may be performed as shown in FIG. 11 on a vehicle (eg, an aircraft, a train, etc.) or a fixed structure including an integrated sensor.
  • a hollow motorized rotator 170 through which the laser beam oscillated from the Q-switch CW laser can pass, and a camera 180 capable of visualizing the inspection area can be further enlarged to enlarge the irradiation area of the laser beam. Include.
  • the inspection procedure and inspection result analysis may be performed in the central control room 200.
  • the mobile and stationary malformed ultrasonic wave imaging apparatuses are used for nuclear power plants and other power generation facilities, infrastructure, vehicle structures and parts, nondestructive reliability evaluation, and actual structural site health evaluation.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
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  • Life Sciences & Earth Sciences (AREA)
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  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)

Abstract

La présente invention concerne un appareil destiné à imager une propagation par ultrasons anormale. Selon un mode de réalisation de l'invention, l'appareil destiné à imager une propagation par ultrasons anormale comprend : une unité d'irradiation par laser conçue pour irradier un faisceau laser à impulsions sur un objet à examiner ; un dilatateur de faisceau conçu pour régler la mise au point du faisceau laser à impulsions ; un dispositif de balayage à miroir laser bi-axial conçu pour permettre au faisceau laser à impulsions d'être irradié le long du chemin de balayage de l'objet ; un capteur conçu pour détecter des ultrasons générés dans l'objet sur lequel est irradié le faisceau laser à impulsions ; un dispositif de contrôle d'imagerie conçu pour générer une structure d'ultrasons 3D en retirant les ultrasons normaux des ultrasons détectés par le capteur, puis en décomposant l'axe des temps de la structure d'ultrasons 3D afin de générer une image de propagation par ultrasons anormale ; et une unité de sortie conçue pour émettre en sortie l'image de propagation par ultrasons anormale. En conséquence, il est possible de réaliser une quantification et une mesure de la taille d'une blessure dans une structure compliquée qui est difficile à analyser via une image par ultrasons sans préparation.
PCT/KR2011/001453 2010-03-04 2011-03-03 Appareil destiné à imager une propagation par ultrasons anormale Ceased WO2011108855A2 (fr)

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KR1020100019469A KR101057586B1 (ko) 2010-03-04 2010-03-04 기형 초음파 전파 영상화 장치
KR10-2010-0019469 2010-03-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112748113A (zh) * 2020-12-21 2021-05-04 杭州电子科技大学 一种集成激光测量与超声探伤的测头装置及其测量方法

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KR101539599B1 (ko) 2013-12-13 2015-08-06 한국과학기술원 다중 밀도 비접촉식 레이저 스캐닝을 통한 구조물 손상 진단 고속화 장치 및 이의 진단 방법
KR101549504B1 (ko) 2014-03-10 2015-09-03 전북대학교산학협력단 선형 화약 유도 충격파 가시화 및 위상배열 손상 가시화 장치 및 방법
KR101608424B1 (ko) 2014-10-27 2016-04-04 한국철도기술연구원 철도시스템 유지보수 효율화를 위한 검사 장치
CN110824009B (zh) * 2019-11-04 2025-01-07 中国人民解放军空军工程大学 针对复合材料筒体结构的激光超声可视化检测设备及方法

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US5801312A (en) * 1996-04-01 1998-09-01 General Electric Company Method and system for laser ultrasonic imaging of an object
KR100584010B1 (ko) * 2004-12-13 2006-05-29 한국원자력연구소 다중 광센서를 사용하는 레이저 초음파 검사 장치 및 방법
JP2006170684A (ja) 2004-12-14 2006-06-29 Toyota Motor Corp プレス不良の検査方法、及び検査装置
KR100788823B1 (ko) 2006-01-23 2007-12-27 한국원자력연구원 표면 결함 정보 추출을 위한 레이저-초음파 검사 장치 및방법

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112748113A (zh) * 2020-12-21 2021-05-04 杭州电子科技大学 一种集成激光测量与超声探伤的测头装置及其测量方法

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KR101057586B1 (ko) 2011-08-18

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