KR101919028B1 - Method for ultrasonic inspection and, apparatus and system for the same - Google Patents

Abstract

According to embodiments of the present invention, disclosed are a method for ultrasonic inspection, and a device and a system therefor. The disclosed embodiments provide a mechanism for outputting ultrasonic signals by applying a two spline interpolation method, an average change rate method, and an average moving method. Therefore, the embodiments of the present invention can have an effect of improving a signal-to-noise ratio (SNR) when compared with a conventional interpolation method by applying the spline interpolation method and an average moving interpolation method together.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an ultrasound inspection method,

The present invention relates to an ultrasonic inspection method and apparatus and system therefor, and more particularly, to an ultrasonic inspection method for reducing noise or defects of an ultrasonic signal, and an apparatus and a system therefor.

Generally, ultrasonic inspection is difficult in ultrasonic inspection due to anisotropic crystal grains and various crystal orientations of a specimen, for example, a welded portion.

This is because when the ultrasonic beam propagates to the test body due to the anisotropic characteristics and the various crystal orientations, the acoustic impedance between the crystal grain boundaries is changed, so that the ultrasonic signal is separated and distorted. In addition, This is because scattering occurs.

These phenomena cause degradation of defect detection capability, for example, in the inspection of welds, and ultrahigh-temperature superalloy alloys with ultrasonic attenuation are far less capable of detecting defects than inspecting welds on general carbon steel surfaces.

Therefore, in order to secure the inspection defect detection ability of the super-heat-resistant alloy, a variety of noise reduction signal processing techniques (Moving averaging method, Spline method, Wavelet denoising method) have appeared. However, the above-described conventional signal processing techniques still have limitations in reducing noise.

Korean Patent Publication No. 2015-0123602, Publication Date: November 04, 2015 Title of the invention: Noise reduction method of ultrasonic inspection.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ultrasonic inspection method for improving noise of an ultrasonic signal by applying various noise reduction techniques, and an apparatus and a system therefor.

According to an aspect of the present invention, there is provided a method of inspecting an ultrasonic signal in an ultrasonic inspection apparatus, comprising: obtaining an ultrasonic signal generated from an inspected object; Linearly linearizing each section of the obtained ultrasonic signal using spline interpolation; Calculating an average rate of change between a minimum value and a maximum value generated for each of the first linearized sections; Obtaining a plurality of average change rate values by applying different weights according to a difference of the calculated average change rates; Obtaining a plurality of moving average values by moving average a plurality of the average rate of change values obtained; Secondarily linearizing each curve section to which the obtained plurality of moving average values are applied; And outputting the second linearized ultrasonic signal.

In one embodiment, the first linearizing step may include obtaining a plurality of intermediate points for each section of the obtained ultrasonic signal.

In one embodiment, calculating the average rate of change may calculate an average rate of change between a minimum value and a maximum value generated between the obtained plurality of weighted points.

In one embodiment, the obtaining of the plurality of average rate of change values comprises: determining a predetermined weight based on the difference in the calculated average rate of change; And applying the determined weight to the average rate of change.

In one embodiment, the step of acquiring the plurality of average rate of change values may be such that as the difference of the average rate of change increases, a weight with a large change in the ultrasound signal is applied to the average rate of change, A small weight change in the signal can be applied to the average rate of change.

In one embodiment, the inspecting body may be preferably a welded portion made of a super-heat resistant alloy.

According to another aspect of the present invention, there is provided an ultrasonic diagnostic apparatus comprising: an ultrasonic signal acquiring unit receiving an ultrasonic signal generated from an inspected object; A first linearization unit for linearly linearizing each section of the received ultrasonic signal using spline interpolation; A rate of change calculation unit for calculating an average rate of change between a minimum value and a maximum value generated for each of the first linearized sections; A rate of change value acquisition unit for obtaining a plurality of average rate of change values by applying different weights according to the difference of the calculated average rate of change; An average value obtaining unit that obtains a plurality of moving average values by moving average a plurality of average rate of change values obtained; A second linearization unit that linearly transforms each of the curve segments to which the obtained plurality of moving average values are applied using the spline interpolation; And a signal output unit for outputting the secondary linearized ultrasonic signal.

In another embodiment, the first linearization unit may acquire a plurality of intermediate points for each section of the obtained ultrasonic signal.

In another embodiment, the rate of change calculator may calculate an average rate of change between a minimum value and a maximum value generated between the obtained plurality of intermediate points.

In another embodiment, the rate of change value acquisition unit may include: a weight setting unit for determining a predetermined weight according to the difference of the calculated average rate of change; And a weight applying unit for applying the determined weight to the average rate of change.

In another embodiment, the weight application unit applies a weight having a larger change in the ultrasonic signal to the average change rate as the difference in the average change rate increases, and as the difference in the average change rate becomes smaller, And can be applied to the average rate of change.

According to another aspect of the present invention, there is provided a test specimen, A transducer for irradiating ultrasonic waves to the test specimen to probe ultrasonic signals reflected from the test specimen; And an ultrasonic inspection system including any one of the above-described ultrasonic inspection apparatuses.

In another embodiment, the inspection may comprise vertical or square inspection of the ultrasonic signal.

In yet another embodiment, the specimen test piece may be preferably a welded portion made of a super heat resistant alloy.

As described above, the embodiments of the present invention have an effect of improving the SNR (Signal to Noise Ratio) compared to the conventional interpolation methods by applying the spline interpolation method and the moving average interpolation method together.

Further, since the embodiments of the present invention can reduce the noise of the ultrasonic signal, it is easy to detect defects in the A-scan with respect to the ultrasonic signal.

Further, since embodiments of the present invention can reduce the noise of the ultrasonic signal, it has the effect of improving the image resolution upon B-scan with respect to the ultrasonic signal.

Other effects not mentioned and not mentioned above can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
1 is a flowchart illustrating a flow of an ultrasonic inspection method according to an embodiment of the present invention.
2 is a block diagram of an ultrasonic inspection system according to another embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration of an ultrasonic inspection apparatus according to another embodiment of the present invention.
4 is a view showing an example of a test piece of a welded portion to be tested according to the present invention.
5 to 8 are views showing states of an ultrasonic signal output from an inspection device and an ultrasonic signal output by applying a conventional noise reduction technique.
9 is a diagram showing an example of an ultrasonic signal output from an inspection apparatus by applying the technique of FIGS. 1 to 3 according to the present invention.
10 is a graph showing the SNRs of the ultrasound signals of FIGS. 5 to 9. FIG.

The scope of the present invention should not be construed as being limited by the embodiments described in the text, since the description of the present invention is only for the structural or functional description. In other words, since the embodiments can be variously modified and have various forms, the scope of the present invention should be understood to include equivalents capable of realizing technical ideas. Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effect.

It is to be understood, however, that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

It is to be understood that the terms such as "comprise" or "comprising", as used in the following embodiments and claims, mean that a component can be implanted unless otherwise specifically stated, But should be understood to include other components as well.

It is also to be understood that the terms "first" and "second" as used in the following embodiments and claims are intended to distinguish one element from another, It should not be. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

On this basis, embodiments of the ultrasonic inspection method and apparatus will be described below.

≪ Embodiment of ultrasonic inspection method >

1 is a flowchart illustrating a flow of an ultrasonic inspection method according to an embodiment of the present invention.

Referring to FIG. 1, an ultrasonic inspection method according to an embodiment of the present invention may include steps 110 through 170 for reducing noise by inspecting an ultrasonic state of an inspection object in an ultrasonic inspection apparatus.

The ultrasonic inspection apparatus mentioned above can check the state of the ultrasonic signal generated from the inspection object through the probe or directly check the state of the ultrasonic signal with respect to the inspection object. Steps 110 to 170 of FIG. 1, which are realized by the ultrasonic inspection apparatus, are as follows.

First, in step 110, the ultrasonic inspection apparatus receives an ultrasonic signal reflected (generated) from a test object through a probe, or directly receives the ultrasonic signal from a test object and acquires an ultrasonic signal can do.

It is preferable that the inspection body mentioned is a welded part made of a super heat resistant alloy. The weld may refer to a portion of the weld structure, such as a ship, that is welded precisely to the accessory structure.

However, it goes without saying that the above-described inspection object is not limited to the above-described welded portion, and may be other types of structures requiring various nondestructive inspection.

Here, the obtained ultrasonic signal may have a discrete signal form that is formed by sampling the continuous state of the ultrasonic signal.

In operation 120, the ultrasonic inspection apparatus may first linearize each section of the discrete signal of the ultrasonic signal, for example, the ultrasonic signal obtained by the step 110, using the algorithmized spline interpolation.

The mentioned spline interpolation method may be realized by, for example, a spline filter provided in the ultrasonic inspection apparatus. However, the ultrasonic inspection apparatus can perform the above-described first-order linearization by, for example, algorithmizing the first-order spline interpolation method.

More specifically, the ultrasonic inspection apparatus includes a primary spline algorithm by a spline filter for each section (curve section) of a discrete signal of the ultrasonic signal or the ultrasonic signal obtained by the step 110 Thereby acquiring a plurality of intermediate points, whereby primary linearization can be achieved for each section of the ultrasonic signal or the ultrasonic signal.

For example, when an arbitrary two intermediate points obtained for each section of an ultrasonic signal or a discrete signal of an ultrasonic signal are given, the ultrasonic inspection apparatus converts a function passing through arbitrary two intermediate points to a linear equation, The first linearization can be achieved.

At this time, since a more accurate approximate solution can be obtained as the interval between arbitrary two intermediate points becomes smaller, each section of the ultrasonic signal or the ultrasonic signal can be ultimately smoothed (smoothed) through the above-described first linearization .

In step 130, the ultrasonic inspection apparatus can calculate an average rate of change between the minimum value and the maximum value generated in each section of the first linearized ultrasonic signal or the discrete signal, for example, between a plurality of intermediate points by the above-described step 120.

The mean rate of change refers to the slope of a straight line passing through two midpoints, e.g., a minimum value and a maximum value, and the ultrasonic testing apparatus can obtain the slope of a straight line passing through two midpoints of a minimum value and a maximum value using differential coefficients. The slope of the straight line may mean a rate of increase of the maximum value with respect to the increase of the minimum value.

As described above, the ultrasonic inspection apparatus can acquire a plurality of average rate of change values from all sections of the ultrasonic signal or the discrete signal by calculating the average rate of change for each section of the ultrasonic signal or the discrete signal.

In step 140, the ultrasonic inspection apparatus may apply a predetermined weight differently according to the difference in the average rate of change calculated in step 130.

For example, the ultrasonic inspection apparatus can determine a predetermined weight according to the difference of the average change rate, and apply the determined weight to the average change rate.

In order to determine a predetermined weight, the ultrasonic inspection apparatus may preset a predetermined weight and store it in a memory.

The memory referred to may consist of a random access memory ("RAM"), a read only memory ("ROM"), a static storage device such as a magnetic or optical disk, or any other type of computer readable medium.

Here, the predetermined weight is the lowest weight, the lowest weight, the lowest weight, the highest weight, the lowest weight, the lowest weight, the lowest weight, And a fifth weight having a weight.

When each section of the ultrasonic signal corresponds to the bottom reflection signal, the ultrasonic inspection apparatus matches the bottom reflection signal to the first weight. For example, when each section of the ultrasonic signal corresponds to a large defect, For example, when each section of the ultrasonic signal corresponds to a general defect or a side reflection signal, the general defect or the side reflection signal is matched to the third weight, and for example, each section of the ultrasonic signal When the fine defect, the weld interface or the coarse crystal are matched to the fourth weight, for example, when each section of the ultrasonic signal corresponds to a crystal grain or electric noise, Or the electrical noise may be matched to the fifth weight.

In this case, in step 140, the ultrasound testing apparatus may determine the weights and store them in the memory as described above, and may further store the results matched to the weights in the memory.

As can be seen, it can be seen that the larger the variation of the ultrasonic signal is, the larger the weight corresponds to the first weight, and the smaller the variation of the ultrasonic signal is, the smaller the weight is.

Thus, in step 140, the ultrasound testing apparatus can apply the first weight stored in the memory to the average change rate having the largest difference if the difference between the plurality of average change rates is the largest. For example, if the average change rate has a difference of 1 to 100, it can be regarded as corresponding to the first weight, and the first weight can be applied to the average rate of change having a difference of 1 to 100.

Accordingly, the ultrasonic inspection apparatus applies the first weight having a large change in the ultrasonic signal to the average change rate as the difference in the average change rate increases, and as the difference in the average change rate decreases, the fifth weight, It is possible to obtain a plurality of average rate of change values that reduce the noise between the midpoints between the minimum value and the maximum value.

In step 150, the ultrasonic inspection apparatus may obtain a plurality of moving average values by moving average a plurality of average rate of change values obtained in step 140. [ At this time, the moving average can be realized by, for example, a moving average filter provided in the ultrasonic inspection apparatus.

However, without using the moving average filter, the ultrasonic inspection apparatus can obtain a plurality of moving average values between the midpoints of the minimum and maximum values by moving average a plurality of average rate of change values using the algorithmized moving average interpolation method. Moving averaging of the average rate of change will reduce noise, etc., between the midpoints between the minimum and maximum values.

In step 160, the ultrasonic inspection apparatus can linearly curve each curve section to which the plurality of moving average values obtained in step 150 are applied, using the spline interpolation method.

The mentioned spline interpolation method may be realized by, for example, a spline filter provided in the ultrasonic inspection apparatus. However, the ultrasonic inspection apparatus can be secondarily linearized by, for example, algorithmizing the second-order spline interpolation method.

The second spline interpolation method can be secondarily linearized by approximating the second slice of the same slope to each intermediate point for each curve section in which a plurality of moving average values are applied.

Finally, in step 170, the ultrasonic inspection apparatus can output the second-order linearized ultrasonic signal by the above-mentioned step 160. [

As described above, in the present embodiment, in the process of detecting discrete signals of ultrasonic signals or ultrasonic signals by applying two spline interpolation methods, a moving average method, an average rate of change, and the like, it is possible to greatly reduce noise compared to existing interpolation methods .

≪ Embodiment of Ultrasonic Inspection System &

2 is a block diagram of an ultrasonic inspection system according to another embodiment of the present invention.

2, an ultrasonic inspection system according to an embodiment includes an inspection object test piece 200, a probe for irradiating ultrasonic waves to the inspection object test piece 200 to probe the ultrasonic signal reflected from the inspection object test piece 200, And an ultrasonic inspection apparatus 400 for analyzing noise and / or defects from the ultrasound signal received from the ultrasonic signal or the test specimen 200.

In one embodiment, the test specimen 200 may be a weld consisting of an ultra-heat resistant alloy having anisotropic crystal grains and various crystal orientations. The weld may refer to a portion of the weld structure, such as a ship, that is welded precisely to the accessory structure.

However, it goes without saying that the above-described inspection object is not limited to the above-described welded portion, and may be other types of structures requiring various nondestructive inspection.

In one embodiment, the transducer 300 is an apparatus for examining an ultrasonic signal reflected from a specimen test piece. The transducer 300 serves to scan an ultrasonic wave incident on the surface of the specimen and transmitted through the specimen. The above-mentioned flaw detection technique can mean vertical flaw detection or square flaw detection on the ultrasonic signal generated from the surface of the inspection object. However, it is not limited to such a flaw detection technique, and the angle of the vertical flaw or square flaw can arbitrarily have an angle.

The top shell 300 includes a casing 310, a connector 320 disposed at a rear end of the casing 310, and a circular portion 330, which is inserted in the casing 310 and connected to the connector 320 through a wire, A rear member 340 serving as a damper for restricting the vibration of the piezoelectric element 330 placed in the rear of the piezoelectric element 330 in the casing 310, And a front matching layer member 350 disposed on the front surface of the casing 310 and positioned in front of the piezoelectric element 330 as a contact portion.

However, the probe 300 having the above-described configurations is merely an example, and other configurations may be said to be within the scope of the probe 300 in the present embodiment.

In one embodiment, the ultrasound testing apparatus 400 receives the ultrasound signals measured from the probe 300 or directly measures the ultrasound signals from the test specimen 200 and performs a plurality of interpolation methods, , Moving average interpolation with weighting, etc., can be applied to reduce the noise by examining the state of the ultrasonic wave. In the past, spline interpolation and moving average interpolation were applied separately.

Hereinafter, the ultrasonic inspection apparatus 400 will be described in more detail.

≪ Specific Example of Ultrasonic Testing Apparatus >

FIG. 3 is a block diagram illustrating a configuration of an ultrasonic inspection apparatus according to another embodiment of the present invention.

3, the ultrasonic inspection apparatus 400 includes an ultrasonic signal acquisition unit 410, a first linearization unit 420, a rate of change calculation unit 430, A change rate value acquisition unit 440, an average value acquisition unit 450, a second linearization unit 460, a signal output unit 470, and a memory 480.

First, in one embodiment, the ultrasound signal acquisition unit 410 receives ultrasound signals reflected (generated) from the inspected object through the probe 300 when the ultrasound waves are radiated to the inspected object to be inspected, The ultrasound signal can be obtained by directly measuring the reflected ultrasound signal.

The acquired ultrasound signal may have a discrete signal form, which is formed by sampling the continuous state of the ultrasound signals.

In one embodiment, the first linearizer 420 performs linear interpolation on the ultrasonic signal obtained by the ultrasonic signal obtaining unit 410 using algorithmic spline interpolation, such as the angle of the discrete signal of the ultrasonic signal The section can be linearized first.

More specifically, the first linearizing unit 420 obtains a plurality of intermediate points by applying a first-order spline algorithm for each section (curve section) of the obtained ultrasonic signal or the discrete signal of the ultrasonic signal, A first order linearization can be achieved for each section of the signal.

For example, when the arbitrary two intermediate points obtained for each section of the obtained ultrasonic signal or the discrete signal of the ultrasonic signal are given, the first linearization unit 420 calculates a function passing through arbitrary two intermediate points thereof as a linear equation By performing the conversion, first-order linearization with respect to the ultrasonic signal can be achieved.

At this time, since a more accurate approximate solution can be obtained as the interval between arbitrary two intermediate points becomes smaller, each section of the ultrasonic signal or the ultrasonic signal can be ultimately smoothed (smoothed) through the above-described first linearization . The first linearization unit 420 may be a spline filter.

In one embodiment, the rate of change calculator 430 calculates the rate of change between the minimum and maximum values generated between the intervals of the first linearized ultrasonic signal or the discrete signal by the first linearizer 420, for example, Can be calculated.

The average rate of change refers to a slope of a straight line passing through two midpoints, for example, a minimum value and a maximum value. The rate of change calculation unit 430 can calculate the slope of a straight line passing through two midpoints of a minimum value and a maximum value have. The slope of the straight line may mean a rate of increase of the maximum value with respect to the increase of the minimum value.

As described above, the rate of change calculator 430 can obtain a plurality of average rate of change values from all the intervals of the ultrasonic signal or the discrete signal by calculating the average rate of change for each section of the ultrasonic signal or the discrete signal.

In one embodiment, the rate of change value acquisition unit 440 may apply a predetermined weight differently according to the difference in the average rate of change calculated by the rate-of-change rate calculator 430 described above.

To this end, the rate of change value acquisition unit 440 includes a weight setting unit 441 for determining a predetermined weight according to the difference in the average rate of change, and a weight applying unit 442 for substantially applying the determined weight to the average rate of change .

In one embodiment, the weight setting unit 441 may set a predetermined weight in advance and store it in the memory 480 as a part for determining a predetermined weight.

The memory 480 referred to may be comprised of a random access memory ("RAM"), a read only memory ("ROM"), a static storage device such as a magnetic or optical disk, or any other type of computer readable medium.

Here, the predetermined weight is the lowest weight, the lowest weight, the lowest weight, the highest weight, the lowest weight, the lowest weight, the lowest weight, And a fifth weight having a weight.

Then, the weight setting unit 441 matches the bottom reflection signal to the first weight, for example, when each section of the ultrasonic signal corresponds to the bottom reflection signal. For example, when each section of the ultrasonic signal corresponds to a large defect The general defects or the side reflection signals are matched to the third weight, and the ultrasound signals are detected by, for example, ultrasonic waves If each section of the signal corresponds to a micro defect, weld interface or coarse grain, the micro defect, weld interface or coarse grain is matched to the fourth weight. For example, if each section of the ultrasonic signal corresponds to a grain or electric noise , The crystal grains or electric noise may be matched to the fifth weight.

Accordingly, the weight setting unit 441 can determine the weights and store them in the memory, as described above, and store the results matched to the weights in the memory 480.

As can be seen, it can be seen that the larger the variation of the ultrasonic signal is, the larger the weight corresponds to the first weight, and the smaller the variation of the ultrasonic signal is, the smaller the weight is.

Then, the weight applying unit 442 according to an embodiment may apply the first weight stored in the memory 480 to the average change rate having the largest difference if the difference between the plurality of average change rates is the largest.

For example, if the average change rate has a large difference of 1 to 100, the weight applying unit 442 may consider the first change weight to correspond to the first weight and apply the first weight to the average change rate having a difference of 1 to 100 If the average change rate has the smallest difference of 1 to 10, it can be regarded as corresponding to the fifth weight, and the fifth weight can be applied to the average change rate having a difference of 1 to 10.

As described above, the rate-of-change value acquisition unit 440 including the weight value setting unit 441 and the weight value application unit 442 determines that the first weight having a large change in the ultrasonic signal becomes the average rate of change And applying a fifth weight having a small change in the ultrasonic signal to the average rate of change as the difference between the average rate of change and the average rate of change is smaller.

In one embodiment, the average value obtaining unit 450 may obtain a plurality of moving average values by moving average a plurality of average rate of change values obtained by the rate-of-change value obtaining unit 440 described above.

For example, the average value acquiring unit 450 can obtain a plurality of moving average values between the midpoints between the minimum and maximum values by moving average a plurality of average rate of change values using the algorithmized moving average interpolation method. Moving averaging of the average rate of change will reduce noise, etc., between the midpoints between the minimum and maximum values. The average envelope acquisition unit 450 may be a moving average filter.

In one embodiment, the second linearization unit 460 performs a second linear interpolation on the respective curve segments to which the plurality of moving average values obtained by the average value acquiring unit 450 are applied, using second spline interpolation. Can be linearized.

The mentioned second spline interpolation method can be secondarily linearized by approximating the second slice of the same slope to each intermediate point for each curve section in which a plurality of moving average values are applied. The second linearization unit 460 may be a secondary spline filter.

Finally, the signal output unit 470 can output the second-order linearized ultrasonic signal by the second linearization unit 460 described above.

As described above, in the present embodiment, in the process of detecting discrete signals of ultrasonic signals or ultrasonic signals by applying two spline interpolation methods, a moving average method, an average rate of change, and the like, it is possible to greatly reduce noise compared to existing interpolation methods .

<Comparative Example>

4 is a view showing an example of a test piece of a welded portion to be tested according to the present invention. The welding portion test piece shown in Fig. 4 has a weld portion 20 disposed between the base material portion 10 and the base material portion 10. The processing depth H and the machining length L of the welded portion 20 are shown in Table 1 below.

EDM notch Machining length (L) Processing depth (H) #One 5mm 1mm #2 5mm 3mm # 3 5mm 5mm

These welding specimens refer to the Alloy 263 and 282 models, and the inspection conditions of ultrasonic signals are as follows. First, the inspection method is vertical or square, and the angle of tilt is 25 °, 35 °, 40 °, 45 ° and 50 °. The probe has 5MHz and 0.25 inch condition. Focus LT and Tomoview are applied to the test equipment and software.

The results of the ultrasonic signal output from the inspection equipment by applying the existing noise reduction techniques under the inspection conditions of the ultrasonic signals can be shown in FIGS. 5 to 9, and by applying the technique of FIGS. 1 to 3, The results of the ultrasound signal output are shown in FIG.

That is, the ultrasound signal shown in FIG. 5 is output from the test equipment without using the existing or the technique of the present embodiment, and the SNR (Signal-to-Noise Ratio) 30 of the ultrasound signal output from the test equipment is shown in FIG. 10 As measured by 6.16.

6, the signal-to-noise ratio (SNR) 40 of the ultrasound signal output from the test equipment is the result of outputting the ultrasonic signal shown in FIG. 6 using the conventional average interpolation method, 7.44.

As shown in FIG. 7, the ultrasonic signal output from the test equipment by applying the conventional spline interpolation method has a signal-to-noise ratio (SNR) 50 of 7.22 Respectively.

The signal-to-noise ratio (SNR) 60 of the ultrasound signal output from the test equipment is 7.10 as shown in FIG. 10, as a result of outputting the ultrasonic signal shown in FIG. 8 from the test equipment using the existing Wavelet interpolation method .

However, the ultrasound signal shown in FIG. 9 is the result of outputting from the test equipment by applying the technique of FIGS. 1 to 3 described above, and the SNR (Signal-to-Noise Ratio) of the ultrasound signal output from the test equipment is 70 Is confirmed to be 10. 28 as shown in FIG. 10, the SNR of the ultrasonic signal according to the above-described FIG. 5 to FIG. 8 is much improved as compared with that of FIG. 5, and noise reduction and defect detection are greatly improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the following claims And changes may be made without departing from the spirit and scope of the invention.

200: inspection body test piece 300: probe
400: ultrasonic inspection apparatus 410: ultrasonic signal acquisition unit
420: first linearization unit 430: rate of change calculation unit
440: rate of change value acquisition unit 450: average value acquisition unit
460: second linearization unit 470: signal output unit
480: Memory

Claims (14)

A method for inspecting an ultrasonic signal in an ultrasonic inspection apparatus,
Obtaining an ultrasonic signal generated from the inspected object;
Linearly linearizing each section of the obtained ultrasonic signal using spline interpolation;
Calculating an average rate of change between a minimum value and a maximum value generated for each of the first linearized sections;
Obtaining a plurality of average change rate values by applying different weights according to a difference of the calculated average change rates;
Obtaining a plurality of moving average values by moving average a plurality of the average rate of change values obtained;
Secondarily linearizing each curve section to which the obtained plurality of moving average values are applied; And
Outputting the secondary linearized ultrasonic signal;
Lt; / RTI &gt;
Wherein the obtaining of the plurality of average rate of change values comprises:
Determining a predetermined weight according to the difference of the calculated average rate of change; And
Applying the determined weight to the average rate of change;
And an ultrasonic inspection method. The method according to claim 1,
Wherein the first linearizing step comprises:
Acquiring a plurality of intermediate points for each section of the obtained ultrasonic signal;
And an ultrasonic inspection method. 3. The method of claim 2,
Wherein the step of calculating the average rate of change comprises:
And calculates an average rate of change between a minimum value and a maximum value generated between the obtained plurality of intermediate points. delete The method according to claim 1,
Wherein the obtaining of the plurality of average rate of change values comprises:
Applying a weight having a large change in the ultrasonic signal to the average change rate as the difference in the average change rate is greater and applying a weight having a smaller change in the ultrasonic signal to the average change rate as the difference in the average change rate is smaller, Way. The method according to claim 1,
Wherein the inspection object is a welded portion made of a super heat resistant alloy. An ultrasound signal acquisition unit for receiving ultrasound signals generated from an inspected object;
A first linearization unit for linearly linearizing each section of the received ultrasonic signal using spline interpolation;
A rate of change calculation unit for calculating an average rate of change between a minimum value and a maximum value generated for each of the first linearized sections;
A rate of change value acquisition unit for obtaining a plurality of average rate of change values by applying different weights according to the difference of the calculated average rate of change;
An average value obtaining unit that obtains a plurality of moving average values by moving average a plurality of average rate of change values obtained;
A second linearization unit that linearly transforms each of the curve segments to which the obtained plurality of moving average values are applied using the spline interpolation; And
A signal output unit for outputting the secondary linearized ultrasonic signal;
Lt; / RTI &gt;
Wherein the rate-
A weight setting unit for determining a predetermined weight according to the difference of the calculated average rate of change; And
A weight applying unit for applying the determined weight to the average rate of change;
And an ultrasonic inspection apparatus. 8. The method of claim 7,
Wherein the first linearization unit comprises:
And obtains a plurality of intermediate points for each section of the obtained ultrasonic signal. 9. The method of claim 8,
Wherein the rate-
And calculates an average rate of change between a minimum value and a maximum value generated between the obtained plurality of intermediate points. delete 8. The method of claim 7,
Wherein the weight applying unit comprises:
Applying a weight having a large change in the ultrasonic signal to the average change rate as the difference in the average change rate is greater and applying a weight having a smaller change in the ultrasonic signal to the average change rate as the difference in the average change rate is smaller, Device. Inspection body test piece;
A transducer for irradiating ultrasonic waves to the test specimen to probe ultrasonic signals reflected from the test specimen; And
An ultrasonic examination apparatus according to any one of claims 7 to 9 and 11,
And an ultrasonic inspection system. 13. The method of claim 12,
Wherein the inspection includes a vertical inspection or a square inspection on the ultrasonic signal. 13. The method of claim 12,
Wherein the inspection specimen test piece is a welded portion made of a super heat resistant alloy.

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