KR20150017407A - Apparatus for water immersion ultrasonic flaw detecting - Google Patents

Apparatus for water immersion ultrasonic flaw detecting Download PDF

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Publication number
KR20150017407A
KR20150017407A KR1020130071549A KR20130071549A KR20150017407A KR 20150017407 A KR20150017407 A KR 20150017407A KR 1020130071549 A KR1020130071549 A KR 1020130071549A KR 20130071549 A KR20130071549 A KR 20130071549A KR 20150017407 A KR20150017407 A KR 20150017407A
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South Korea
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probe
ultrasonic
laser
arm
unit
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KR1020130071549A
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Korean (ko)
Inventor
송성진
강토
석창성
황영인
김학준
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성균관대학교산학협력단
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Priority to KR1020130071549A priority Critical patent/KR20150017407A/en
Publication of KR20150017407A publication Critical patent/KR20150017407A/en

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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
    • G01N29/04—Analysing solids
    • 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
    • G01N29/223—Supports, positioning or alignment in fixed situation
    • 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
    • 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
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
    • 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
    • G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
    • G01N29/262—Arrangements for orientation or scanning by relative movement of the head and the sensor by electronic orientation or focusing, e.g. with phased arrays

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  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Optics & Photonics (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The present invention relates to a water-immersion ultrasonic testing apparatus, and more particularly, to a water-immersion ultrasonic testing apparatus for detecting defects of a test body, the ultrasonic testing apparatus comprising: a probe for detecting the defect using ultrasonic waves; An interval adjusting unit connected to the transducer for adjusting an interval between the probe and the test body; And a laser irradiating unit for irradiating a laser beam to a region of the ultrasonic wave reaching the test object.
Thereby, a water-immersion ultrasonic testing apparatus is provided in which an ultrasonic wave reaching a test body can be visually confirmed by using a laser, and the path of the laser can be changed so that an error can be reduced by irradiating the ultrasonic wave at an accurate position.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an ultrasonic testing apparatus,

The present invention relates to a water-immersion ultrasonic testing apparatus, and more particularly, to a water-immersion ultrasonic testing apparatus for tracking a path of an ultrasonic wave by using a laser, The present invention relates to a water immersion ultrasound diagnostic test apparatus capable of reducing the amount of water.

In order to guarantee the reliability of the product, there are two methods for securing the experimental data.

This is a nondestructive test that evaluates mechanical strength through observation and tensile testing of materials, equipment, and structures directly, and tests the properties, condition, and internal structure of the material or specimen without changing the original shape and function of the specimen. .

Now, nondestructive tests with advantages of improvement of reliability, improvement of manufacturing technology, cost reduction, etc. have been widely used. In particular, ultrasonic testing can be easily performed even when the thickness of a test sample is thick. The test is widely used.

Generally, an ultrasonic test is a method of detecting discontinuity or defects existing in a test body by introducing an ultrasonic wave into the test body.

The ultrasonic test is widely applied to measure the size, thickness, material, uniformity of the specimen as well as to measure the size and position of the discontinuity present in the specimen.

The TOFD (Time Of Flight Diffraction) method developed for the inspection of welds has been recognized as a high-precision defect depth detection technology, since ultrasonic diffraction signals generated at the defect tip are received and evaluated in the ultrasonic test.

1 is a view showing the principle of an ultrasonic flaw detection test by the TOFD method.

The TOFD method is based on the use of a lateral wave (LW), which directs two transducers at regular intervals on the surface of the test specimen, and which propagates directly between the transducers, or a reflected wave at the bottom of the specimen, The height is measured.

However, in the TOFD method, when the thickness of the test sample is small, the interval between the side wave and the bottom wave is short, so that the diffraction wave of the defect can be combined.

That is, when the defect end is close to the flaw surface side or the bottom surface side, there arises a problem that a dead band occurs where the position of the defect end is not clearly measured due to interference with the side wave or the bottom reflection wave.

Therefore, an I-TOFD (Immersion Time of Flight Diffraction) method has been proposed to overcome the problems of the TOFD method.

Fig. 2 is a view showing the principle of an ultrasonic flaw detection test by the I-TOFD method. Fig.

The I-TOFD method is a method that utilizes the phenomenon that the waves are refracted in the liquid contact medium, unlike the TOFD method, which detects defects by using the time difference of reflected waves by contacting two transducers directly to the test body.

That is, the I-TOFD method is a method of detecting defects by inserting ultrasonic waves in air without contacting two probes directly with the specimen, inserting the specimen into water, and adjusting the angle and position to analyze the pulse.

However, since the I-TOFD method is required to irradiate the ultrasonic wave without contacting the test body, there is a problem that an ultrasonic wave can not be irradiated to the precise position, resulting in an error.

In addition to the construction or assembly of welded structures in the field, information on the depth of defects is very important in predicting the life expectancy and soundness of parts and materials in operation and minimizing errors.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve such conventional problems, and it is an object of the present invention to provide an ultrasonic diagnostic apparatus, an ultrasonic diagnostic apparatus, Which is capable of reducing the number of the ultrasonic waves to be measured.

According to the present invention, there is provided an apparatus for immersion ultrasonic testing for detecting a defect in a specimen, the apparatus comprising: a probe for detecting the defect using ultrasonic waves; An interval adjusting unit connected to the transducer for adjusting an interval between the probe and the test body; And a laser irradiating unit for irradiating a laser beam to a region of the ultrasonic wave reaching the test body.

The apparatus may further include a path adjusting unit connected to the laser irradiating unit and adjusting the irradiation path of the laser.

The gap adjusting unit may include: a fixing unit; And a coupling part connected to the transducer at one end and connected to the fixing part at the other end and extending in the direction of the test piece or reducing the direction of the fixing part to adjust the distance between the probe and the test piece.

The path adjusting unit may include: a sliding unit surrounding the side surface of the gap adjusting unit and slidably moving along the gap adjusting unit; A first arm rotatably connected to the sliding portion; The first arm may be rotatably connected to the first arm and the other end may be rotatably connected to the first arm.

The controller may further include a control unit for controlling the rotation angle of the first arm and the second arm by moving the sliding unit in accordance with the movement of the coupling unit to control the laser to be irradiated to an area where the ultrasonic waves reach the specimen can do.

The path adjusting unit may further include a jig for fixing the laser irradiating unit to the path adjusting unit.

According to the present invention, it is possible to visually confirm the dashed line of the ultrasonic wave by adopting the laser irradiation part for irradiating the laser to the area where the ultrasonic waves reach the test body, thereby improving the reliability of the defect detection result.

In addition, by adopting the path adjusting unit and changing the irradiation path of the laser, the broken line of the ultrasonic wave can be easily confirmed.

Further, since the probe is connected to the engaging portion provided so as to be stretchable and retractable from the fixed portion, the distance between the test body and the probe can be more easily adjusted, thereby preventing occurrence of dead zones.

Further, by moving the sliding portion in accordance with the movement of the engaging portion, the irradiation path of the laser can be more easily converted.

In addition, by adopting the control section capable of controlling the movement of the sliding section, the movement of the sliding section can be made more precise and the irradiation path of the laser can be more easily converted.

Further, by providing a jig for fixing the laser irradiation part to the path adjusting part, the error can be reduced, and the reliability of the defect detection result can be improved.

1 is a view showing the principle of an ultrasonic flaw detection test by the TOFD method.
Fig. 2 is a view showing the principle of an ultrasonic flaw detection test by the I-TOFD method. Fig.
3 is a perspective view of a water-immersion ultrasonic testing apparatus according to an embodiment of the present invention.
4 is an exploded perspective view of the water-immersion ultrasonic testing apparatus of Fig.
5 is a view showing the operation of the water-immersion ultrasonic testing apparatus shown in Fig.
6 is a view showing a method of detecting defects of a test body by using the water immersion ultrasonic testing apparatus of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a water immersion ultrasonic testing apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. This is for the purpose of illustrating the present invention and is not intended to limit the scope of protection defined by the appended claims.

FIG. 3 is a perspective view of a water-immersion ultrasonic testing apparatus according to an embodiment of the present invention, and FIG. 4 is an exploded perspective view of the water-immersion ultrasonic testing apparatus of FIG.

3 and 4, a water immersion ultrasonic testing apparatus 100 according to an embodiment of the present invention includes a probe 110, a gap adjusting unit 120, a laser irradiating unit 130, a path adjusting unit 140 And a control unit 150.

The water immersion ultrasonic testing apparatus 100 according to an embodiment of the present invention relates to the I-TOFD method and is used in the water immersion ultrasonic testing apparatus 100 used in the TOFD method by the water immersion method.

Herein, the water immersion method is a method of inserting the test body 10 and the probe 110 into the liquid contact medium 20 and transmitting ultrasound waves to the test body 10 to obtain information in the test body 10.

At this time, the liquid contact medium 20 is generally used with a water repellent agent added to prevent water droplets from forming.

Since the hydrothermal method can arbitrarily change the angle of the probe 110, it is possible to change the angle of incidence with only one probe 110 generating ultrasound waves of longitudinal waves to perform longitudinal wave or transverse wave inspection.

Since the space between the probe 110 and the test body 10 is filled with the liquid contact medium 20 and there is no empty space, the contact state of the surface of the probe 110 is uniform and the probe 110 is directly contacted to the test body 10 There is an advantage that the intensity of the reflected wave due to the change of the contact pressure is not changed.

The transducer 110 transmits or receives an ultrasonic wave to detect information such as defects existing in the test body 10. [

The immersion ultrasound testing is classified into 1-probe method, 2-probe method and multi-probe method depending on the number of probes (110).

In the present embodiment, a transducer 110 for transmitting an ultrasonic wave and two transducers 110 for receiving an ultrasonic wave are used. However, in the case of using a single transducer method, one transducer 110 May be used to receive and transmit ultrasonic waves, but are not limited thereto.

On the other hand, in the present embodiment, a method of generating ultrasonic waves by a vibrator (not shown) among elements constituting the probe 110 is used.

This is a method in which a voltage is applied between both electrodes, and a vibrator is expanded and contracted according to the magnitude and charge of the voltage to generate ultrasonic waves.

Generally, a vibrator is composed of a piezoelectric material that transforms electrical energy into mechanical energy and transforms mechanical energy into electrical energy.

In addition, the probe 110 may include a wedge (not shown) in order to adjust the angle at which the ultrasonic waves are incident on the test body 10.

The gap adjusting unit 120 is provided to adjust the distance between the probe 110 and the test body 10 and is configured to be retractable and includes a fixing part 121, a coupling part 122, and a moving member 123 do.

In the water immersion method used in this embodiment, the most important thing is the distance between the probe 110 and the test body 10, that is, the water distance.

When the distance between the water and the specimen 10 is too short, the surface wave or the side wave of the second and third test specimens 10 interfere with the diffracted wave of the primary defect portion or the bottom specular wave of the specimen 10, There is a problem that there is a dead band which is not clearly measured.

Accordingly, the interval adjusting unit 120 is provided so as to be extendable and adjusts the distance between the probe 110 and the test body 10 by adjusting the distance between the probe 110 and the test body 10.

The fixing portion 121 has a coupling portion 122 to be described later and is coupled to one end of the fixing portion 121, and a path adjusting portion 140 described later is coupled to the fixing portion 121, and a moving member 123 is installed therein.

The coupling part 122 is provided to move the test piece 10 and the probe 110 so as to be movable and has one end coupled to the probe 110 and the other end connected to the fixed part 121 and the moving part 123 ).

That is, when the moving member 123 moves in the direction of the test piece 10, the engaging portion 122 extends in the direction of the test piece 10 to narrow the distance between the water and the moving piece 123 moves in the direction of the fixing portion 121 The distance between the test piece 10 and the probe 110 is adjusted by narrowing the engaging portion 122 in the direction of the fixed portion 121 and widening the distance between the water.

The laser irradiating unit 130 is a member for irradiating a laser beam onto the same area as that of the ultrasound waves reaching the test body 10, and is connected to a path adjusting unit 140 described later.

Since the ultrasonic wave is irradiated to the specimen 10 without contacting the probe 110 with the probe 10, ultrasonic waves can not be irradiated to the precise position, and errors of the defect measurement occur because ultrasonic waves are difficult to visually confirm.

Therefore, the laser irradiation unit 130 can reduce errors in the position, size, and the like of the defects through visual confirmation of the ultrasonic waves irradiated to the test body 10 by irradiating the laser beam to the same area as the area where the ultrasonic waves reach the test body 10 have.

At this time, since it is used for the water immersion method, the laser irradiation unit 130 preferably has a waterproof function.

The path adjusting unit 140 includes a sliding unit 141, a first arm 142, a second arm 143, a tilt member 144, and a jig 145 do.

The sliding portion 141 surrounds the side surface of the fixing portion 121 and slidably moves along the side surface of the fixing portion 121. When the distance between the water and the sliding portion 141 is adjusted according to the movement of the coupling portion 122, And moves along the fixing portion 121 so as to change the irradiation path of the laser.

In this embodiment, one side of the fixing portion 121 is covered. However, if the irradiation path of the laser can be changed, the entire side surface of the fixing portion 121 is not wrapped.

The first arm 142 is connected to the sliding portion 141 by a pivoting member 144 and the other end is connected to the second arm 143 And is rotatably connected to the sliding member 141 by a predetermined angle.

The second arm 143 is connected to the second arm 143 by a pivoting member 144 and the other end is connected to the coupling portion and the pivoting member 144 So as to be rotatable by a predetermined angle in accordance with the movement of the engaging portion 122. [

Although the first arm 142 and the second arm 143 are used as a frame in the present embodiment, if the irradiation path of the laser can be changed by rotating the first arm 142 and the second arm 143 by the pivoting member 144, It does not.

The jig 145 is fixed to the path adjusting unit 140 so that an error does not occur when converting the irradiation path of the laser.

In this embodiment, the jig 145 is attached to the second arm 143 to couple the laser irradiation unit 130, but the present invention is not limited thereto, and the type of the jig 145 is not limited.

The control unit 150 controls the sliding movement of the sliding unit 141 to change the irradiation path of the laser.

When the distance between the probe 110 and the test piece 10 is adjusted by moving the joint part 122, it is necessary to move the slide part 141 so that the laser can be irradiated to the area where the ultrasonic waves reach the test piece 10 .

That is, the controller 150 controls the sliding movement of the sliding part 141 to change the irradiation path of the laser by adjusting the rotation angle of the first arm 142 and the second arm 143.

At this time, the control unit 150 may actively control the movement of the sliding part 141 according to the movement of the coupling part 122 and control it by a program, The control method is not problematic, for example, by manually controlling the movement of the valve body 141.

Hereinafter, the operation of the water immersion ultrasonic testing apparatus according to one embodiment of the present invention will be described.

5 is a view showing the operation of the water-immersion ultrasonic testing apparatus shown in Fig.

First, a transducer 110 for receiving ultrasonic waves into the test body 10 and a transducer 110 for receiving ultrasonic waves reflected or diffracted from the test body 10 are scanned with a predetermined interval.

Here, the scan refers to moving the probe 110 on the test body 10 according to the purpose of the probe.

There are generally B-SCAN method and D-SCAN method, but any method can be used.

On the other hand, there are methods such as a transmission method and a resonance method in the ultrasonic testing method. In this embodiment, when ultrasonic waves are incident on one side of the test body 10 having an arbitrary shape, ultrasonic waves are reflected on the opposite side, A pulse reflection method for measuring information of the test object 10 from the time of returning and the speed of progress of ultrasonic waves is used.

At this time, when there is a defect in the test body 10, when the probe 110 is moved on the test body 10, the time interval of transmitting and receiving the ultrasonic wave at the defective portion and the defective portion, The amount will vary.

That is, the position and size of the defect can be known by comparing the difference in the transmission / reception time difference or the amount of reflected energy of the ultrasonic wave.

Here, in the ultrasonic wave test by the water immersion method, since the probe 110 and the test body 10 are not in direct contact with each other, an area where the ultrasonic waves reach the test body 10 can not be confirmed and an error may occur.

Thus, in this embodiment, by irradiating a laser beam onto the region where the ultrasonic waves reach the test body 10 by using the laser irradiation unit 130, the region where the ultrasonic waves reach the test body 10 can be visually confirmed.

That is, when the probe 110 is scanned and positioned on the test body 10, a laser beam is irradiated to an area where ultrasonic waves reach the test body 10.

The distance between the test piece 10 and the probe 110 is adjusted by moving the engaging portion 122 of the gap adjusting portion 120 so that the above described dead band does not occur.

Referring to FIG. 5 (b), the first arm 142 and the second arm 143 rotate at a predetermined angle along the tiltable member 144 in accordance with the movement of the engaging part 122 at this time.

That is, when the distance between the test body 10 and the probe 110 is adjusted by moving the coupling part 122 in the direction of the test piece 10 or in the direction of the fixing part 121, The angle formed by the first arm 142 and the second arm 143 with the fixing portion 121 and the engaging portion 122 is changed.

Therefore, the laser beam is irradiated to an area different from the area where the ultrasonic wave reaches the specimen 10.

When the inter-water distance is adjusted, the sliding part 141 is slid through the control part 150 so that the laser can be irradiated to the area where the ultrasonic wave reaches the test object 10.

That is, the sliding unit 141 is slid through the control unit 150, which calculates the movement of the sliding unit 141 according to the movement of the coupling unit 122 in advance and controls the program by a program, The moving method such as moving the sliding part 141 directly is not limited.

5 (c), when the sliding portion 141 is moved, the first arm 142 and the second arm 143 rotate at a predetermined angle along the tiltable member 144, whereby the laser irradiation unit 130 ) Irradiates a laser beam to a region where ultrasonic waves reach the test object 10.

That is, since the laser irradiates the region different from the region where the ultrasonic waves reach the specimen 10 by the movement of the engaging portion 122, the sliding portion 141 is moved upward along the fixing portion 121, The angle formed by the first arm 142 and the second arm 143 with the fixing portion 121 and the engaging portion 122 is changed to change the irradiation path of the laser.

As a result, an area and a dashed line through which the ultrasonic waves reach the specimen 10 can be confirmed visually through the laser, so that the error can be reduced.

6 is a view showing a method of detecting defects of a test body by using the water immersion ultrasonic testing apparatus of Fig.

Ultrasonic waves have some characteristics of electromagnetic waves as well as the characteristics of ordinary sound waves.

6, when an ultrasonic wave is irradiated to the test body 10, a back wave wave (BW) reflected and received on the bottom surface of the test body 10 and a lateral wave (LW) The defect is measured using the time difference of the diffracted wave to be diffracted.

The scope of the present invention is not limited to the above-described embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

10: specimen 20: liquid contact medium
100: Water immersion ultrasonic testing apparatus 110: Transducer
120: gap adjusting unit 121:
122: engaging portion 123: moving member
130: laser irradiation unit 140:
141: sliding portion 142: first arm
143: second arm 144: pivot member
145: jig 150:

Claims (6)

1. An apparatus for immersion ultrasonic testing for detecting a defect in a specimen,
A probe for detecting the defect using ultrasonic waves;
An interval adjusting unit connected to the transducer for adjusting an interval between the probe and the test body;
And a laser irradiating part for irradiating a laser beam to a region of the ultrasonic wave reaching the test object. The method according to claim 1,
Further comprising a path adjusting unit connected to the laser irradiating unit and adjusting the irradiation path of the laser. 3. The method according to claim 1 or 2,
Wherein the interval adjusting unit comprises:
Fixed government; And a coupling part connected to the probe at one end and connected to the fixing part at the other end and extending in the direction of the test piece or reducing the direction of the fixing part to adjust the distance between the probe and the test piece. Inspection test apparatus. The method of claim 3,
Wherein the path-
A sliding portion surrounding the side surface of the gap adjusting portion and slidably moving along the gap adjusting portion; A first arm rotatably connected to the sliding portion; And a second arm rotatably connected at one end to the first arm and at another end to be rotatably connected to the coupling portion. 5. The method of claim 4,
And a control unit controlling the rotation angle of the first arm and the second arm by moving the sliding unit in accordance with the movement of the coupling unit so that the laser beam is irradiated to the region where the ultrasonic waves reach the specimen Characterized in that the ultrasonic testing apparatus is a water immersion test apparatus. 6. The method of claim 5,
Wherein the path-
Further comprising a jig for fixing the laser irradiating unit to the path adjusting unit.
KR1020130071549A 2013-06-21 2013-06-21 Apparatus for water immersion ultrasonic flaw detecting KR20150017407A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101694114B1 (en) * 2015-11-05 2017-01-09 조선대학교 산학협력단 Non-contact ultrasonic inspection instrument
CN114487098A (en) * 2021-12-21 2022-05-13 北京钢研高纳科技股份有限公司 Water immersion flaw detection equipment and water immersion flaw detection method
CN114740095A (en) * 2022-04-08 2022-07-12 合肥工业大学 Water immersion ultrasonic detection device and method for complex upper end face of cylindrical thin coating

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101694114B1 (en) * 2015-11-05 2017-01-09 조선대학교 산학협력단 Non-contact ultrasonic inspection instrument
CN114487098A (en) * 2021-12-21 2022-05-13 北京钢研高纳科技股份有限公司 Water immersion flaw detection equipment and water immersion flaw detection method
CN114487098B (en) * 2021-12-21 2023-08-22 北京钢研高纳科技股份有限公司 Water immersion flaw detection equipment and water immersion flaw detection method
CN114740095A (en) * 2022-04-08 2022-07-12 合肥工业大学 Water immersion ultrasonic detection device and method for complex upper end face of cylindrical thin coating
CN114740095B (en) * 2022-04-08 2024-04-16 合肥工业大学 Water immersion ultrasonic detection device and method for complex upper end face of thin cylindrical coating

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