CN106918646A - Ultrasonic imaging method and system - Google Patents
Ultrasonic imaging method and system Download PDFInfo
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- CN106918646A CN106918646A CN201510983300.0A CN201510983300A CN106918646A CN 106918646 A CN106918646 A CN 106918646A CN 201510983300 A CN201510983300 A CN 201510983300A CN 106918646 A CN106918646 A CN 106918646A
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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
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
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Abstract
The invention discloses a kind of ultrasonic imaging method and system, belong to detection technique field.Methods described includes：Two groups of ultrasonic signals of object under test are gathered by ultrasonic sensor, every group of ultrasonic signal includes the n signal of passage；According to default composition algorithm, every group of symmetrical composite signal and asymmetric composite signal of the ultrasonic signal are obtained respectively；Again by default superposition algorithm, positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and the negative sense asymmetrical signals of the object under test are obtained respectively；Hilbert transform and LPF are carried out to four kinds of signals respectively, the interface image of the four width objects under test is obtained.The present invention is separated by carrying out to ultrasonic signal Signal separator and direction, solves the problems, such as relatively low to data processing sophistication in correlation technique, improves accuracy when defects detection is carried out to object interface.The present invention is used for ultrasonic imaging.
Description
Technical field
The present invention relates to detection technique field, more particularly to a kind of ultrasonic imaging method and system.
Background technology
Synthetic aperture focusing (English：Synthetic Aperture Focusing Technique；Referred to as：SAFT)
Ultrasonic imaging method is the one kind in Ultrasonic Nondestructive technology, is mainly used in the layering containing interface
Object (bonding interface of such as joint coating on pipeline) carries out defects detection, and the ultrasonic imaging method can not damaged
On the premise of evil internal structure of body, the defect in object interface is detected, it is possible to determine the defect
Particular location, size and property.
In correlation technique, during using defect in ultrasonic imaging method detection object interface, it is possible to use one
The individual ultrasonic sensor including multiple ultrasonic probes is moved along fixation locus on testee surface, should
Body surface is previously provided with the equal scanning element of multiple spacing, at each scanning element, supersonic sensing
Device can be detected, together by ultrasonic probe to the internal emission ultrasonic signal of object to interior of articles
When the ultrasonic probe can receive the echo-signal and Sampling hold that interior of articles is reflected back, wherein, each
Ultrasonic probe is launched or the signal of reception is a signal for passage, finally to all passages at each
The sampled data collected at scan position is overlapped and is processed with multiple spot dynamic focusing, obtains object interface
Display image, be that can determine that in testee interface with the presence or absence of defect according to the display image.
But, the ultrasonic imaging method in correlation technique has only carried out superposition and multiple spot dynamic to sampled data
Focusing, the sophistication of data processing is relatively low, and the accuracy of display image is relatively low, defects detection result
Accuracy is relatively low.
The content of the invention
It is relatively low to interior of articles defects detection result accuracy in order to solve the ultrasonic imaging algorithm in correlation technique
Problem, the invention provides a kind of ultrasonic imaging method and system.The technical scheme is as follows：
On the one hand, there is provided a kind of ultrasonic imaging method, methods described is applied to ultrasonic image-forming system, described
System includes ultrasonic sensor, and two groups of ultrasonic probe groups, every group are provided with the ultrasonic sensor
The ultrasonic probe group includes n ultrasonic probe, and the n is the integer more than or equal to 2, the side
Method includes：
Two groups of ultrasonic signals of object under test, ultrasonic wave described in every group are gathered by the ultrasonic sensor
Signal includes the n signal of passage；
According to default composition algorithm, the symmetrical composite signal of ultrasonic signal described in every group and non-is obtained respectively
Symmetrical composite signal；
The symmetrical composite signal and asymmetric composite signal of ultrasonic signal according to every group, by default
Superposition algorithm, obtains the positive symmetric signal of the object under test, negative sense symmetric signal, positive non-right respectively
Claim signal and negative sense asymmetrical signals；
It is asymmetric to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense respectively
Signal carries out Hilbert transform and LPF, obtains the interface image of object under test described in four width.
Optionally, it is described according to default composition algorithm, ultrasonic signal X and Y described in every group is obtained respectively
Symmetrical composite signal and asymmetric composite signal, including：
According to default composition algorithm, the symmetrical composite signal of the ultrasonic signal X is obtained
Wherein, XiIt is i-th signal of passage in the ultrasonic signal X；Wherein,
Obtain the asymmetric composite signal X of the ultrasonic signal XFDC=Σ (Xj-Xk), wherein, XjWith
XkThe signal of opposite in phase in the signal of the n passage included for the ultrasonic signal X；
According to default composition algorithm, the symmetrical composite signal of the ultrasonic signal Y is obtained
Wherein, YiIt is i-th signal of passage in the ultrasonic signal Y；
Obtain the asymmetric composite signal Y of the ultrasonic signal YFDC=Σ (Yj-Yk), wherein, YjWith
YkThe signal of opposite in phase in the signal of the n passage included for the ultrasonic signal Y.
Optionally, the symmetrical composite signal and asymmetric composite signal of the ultrasonic signal according to every group,
By default superposition algorithm, positive symmetric signal, negative sense symmetric signal, positive asymmetric letter are obtained respectively
Number and negative sense asymmetrical signals, including：
According to the space D of ultrasonic probe in the ultrasonic sensor, the wave velocity C of ultrasonic wave and described super
The sample frequency Fs of sonic sensor, delay sampling points N y, the delay algorithm are determined by delay algorithm
For：
The symmetrical composite signal of ultrasonic signal according to every group：XDC, YDCWith asymmetric composite signal
XFDC, YFDC, and the delay sampling points N y, by default superposition algorithm, obtain respectively positive
Symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals；
Wherein, positive symmetric signal is：ZDC=YDC+YNy(XDC)；
Negative sense symmetric signal is：FDC=XDC+YNy(YDC)；
Positive asymmetrical signals are：ZFDC=YFDC+YNy(XFDC)；
Negative sense asymmetrical signals are：FFDC=XFDC+YNy(YFDC)；
Wherein, YNy() is represented the Ny sampling number of signal delay in bracket.
Optionally, it is described respectively to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals
Hilbert transform is carried out with negative sense asymmetrical signals and LPF is filtered, obtain object under test described in four width
Interface image, including：
It is asymmetric to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense respectively
Signal carries out Hilbert transform, extracts the positive symmetric signal, negative sense symmetric signal, forward direction asymmetric
The envelope signal of signal and negative sense asymmetrical signals；
It is asymmetric to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense respectively
The envelope signal of signal carries out LPF, obtains the interface image of object under test described in four width.
On the other hand, there is provided a kind of ultrasonic image-forming system, the system includes：Ultrasonic sensor,
One acquisition module, the second acquisition module and signal processing module, are provided with two groups in the ultrasonic sensor
Ultrasonic probe group, ultrasonic probe group described in every group include n ultrasonic probe, the n be more than etc.
In 2 integer；
The ultrasonic sensor, two groups of ultrasonic signals for gathering object under test, ultrasound described in every group
Ripple signal includes the n signal of passage；
First acquisition module, for according to default composition algorithm, ultrasonic wave described in every group being obtained respectively
The symmetrical composite signal and asymmetric composite signal of signal；
Second acquisition module, symmetrical composite signal for the ultrasonic signal according to every group and non-right
Claim composite signal, by default superposition algorithm, obtain respectively the object under test positive symmetric signal,
Negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals；
The signal processing module, for respectively to the positive symmetric signal, negative sense symmetric signal, forward direction
Asymmetrical signals and negative sense asymmetrical signals carry out Hilbert transform and LPF, obtain being treated described in four width
Survey the interface image of object.
Optionally, first acquisition module, is additionally operable to：According to default composition algorithm, obtain described super
The symmetrical composite signal of acoustic signals XWherein, XiFor i-th in the ultrasonic signal X
The signal of individual passage；
Obtain the asymmetric composite signal X of the ultrasonic signal XFDC=Σ (Xj-Xk), wherein, XjWith
XkThe signal of opposite in phase in the signal of the n passage included for the ultrasonic signal X；
According to default composition algorithm, the symmetrical composite signal of the ultrasonic signal Y is obtained
Wherein, YiIt is i-th signal of passage in the ultrasonic signal Y；
Obtain the asymmetric composite signal Y of the ultrasonic signal YFDC=Σ (Yj-Yk), wherein, YjWith
YkThe signal of opposite in phase in the signal of the n passage included for the ultrasonic signal Y.
Optionally, second acquisition module, is additionally operable to：Visited according to ultrasonic wave in the ultrasonic sensor
The sample frequency Fs of the space D, the wave velocity C of ultrasonic wave and the ultrasonic sensor of head, by postponing to calculate
Method determines delay sampling points N y, and the delay algorithm is：
The symmetrical composite signal of ultrasonic signal according to every group：XDC, YDCWith asymmetric composite signal
XFDC, YFDC, and the delay sampling points N y, by default superposition algorithm, obtain respectively positive
Symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals；
Wherein, positive symmetric signal is：ZDC=YDC+YNy(XDC)；
Negative sense symmetric signal is：FDC=XDC+YNy(YDC)；
Positive asymmetrical signals are：ZFDC=YFDC+YNy(XFDC)；
Negative sense asymmetrical signals are：FFDC=XFDC+YNy(YFDC)；
Wherein, YNy() is represented the Ny sampling number of signal delay in bracket.
Optionally, the signal processing module, is additionally operable to：Respectively to the positive symmetric signal, negative sense pair
Claiming signal, positive asymmetrical signals and negative sense asymmetrical signals carries out Hilbert transform, extracts the forward direction
The envelope signal of symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals；
It is asymmetric to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense respectively
The envelope signal of signal carries out LPF, obtains the interface image of object under test described in four width.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
A kind of ultrasonic imaging method and system are the embodiment of the invention provides, the method can be passed by ultrasonic wave
Sensor gathers two groups of ultrasonic signals of object under test, and every group of ultrasonic signal includes the n signal of passage；
According to default composition algorithm, the symmetrical composite signal of every group of ultrasonic signal and asymmetric conjunction are obtained respectively
Into signal, and by default superposition algorithm, positive symmetric signal, the negative sense of the object under test are obtained respectively
Four kinds of signals are finally carried out by symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals respectively again
Hilbert transform and LPF, obtain the interface image of four width objects under test.The ultrasonic imaging method
The ultrasonic signal collected to ultrasonic sensor has carried out Signal separator and direction and has separated, display it is to be measured
Object interface image it is accurate higher, improve accuracy when defects detection is carried out to object interface.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, institute in being described to embodiment below
The accompanying drawing for needing to use is briefly described, it should be apparent that, drawings in the following description are only the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of flow chart of ultrasonic imaging method provided in an embodiment of the present invention；
Fig. 2 is the flow chart of another ultrasonic imaging method provided in an embodiment of the present invention；
Fig. 3 is a kind of structural representation of ultrasonic image-forming system provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to the present invention
Implementation method is described in further detail.
A kind of ultrasonic imaging method is the embodiment of the invention provides, the method can apply to ultrasonic image-forming system
In, the system includes ultrasonic sensor, and two groups of ultrasonic probe groups are provided with the ultrasonic sensor,
Every group of ultrasonic probe group includes n ultrasonic probe, and the n is the integer more than or equal to 2, referring to Fig. 1,
The method includes：
Step 101, two groups of ultrasonic signals that object under test is gathered by ultrasonic sensor, every group of ultrasound
Ripple signal includes the n signal of passage.
Step 102, according to default composition algorithm, every group of symmetrical synthesis letter of the ultrasonic signal is obtained respectively
Number and asymmetric composite signal.
Step 103, according to every group of symmetrical composite signal and asymmetric composite signal of the ultrasonic signal, pass through
Default superposition algorithm, obtains positive symmetric signal, negative sense symmetric signal, the forward direction of the object under test respectively
Asymmetrical signals and negative sense asymmetrical signals.
Step 104, respectively to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense
Asymmetrical signals carry out Hilbert transform and LPF, obtain the interface image of the four width objects under test.
In sum, a kind of ultrasonic imaging method provided in an embodiment of the present invention, the method can be by ultrasound
Wave sensor gathers two groups of ultrasonic signals of object under test, and every group of ultrasonic signal includes the n letter of passage
Number；According to default composition algorithm, the symmetrical composite signal of every group of ultrasonic signal and asymmetric is obtained respectively
Composite signal, and by default superposition algorithm, the positive symmetric signal of the object under test is obtained respectively, is born
To symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals, four kinds of signals are entered respectively again finally
Row Hilbert transform and LPF, obtain the interface image of four width objects under test.The ultrasonic imaging side
The ultrasonic signal that method is collected to ultrasonic sensor carried out Signal separator and direction and separated, and display is treated
The accurate higher of object interface image is surveyed, accuracy when defects detection is carried out to object interface is improve.
Optionally, according to default composition algorithm in step 102, every group of ultrasonic signal X is obtained respectively
With the symmetrical composite signal and asymmetric composite signal of Y, can include：
According to default composition algorithm, the symmetrical composite signal of ultrasonic signal X is obtained
Wherein, XiIt is i-th signal of passage in ultrasonic signal X；Wherein,Represent to X1To Xn
Summation.
Obtain the asymmetric composite signal X of ultrasonic signal XFDC=Σ (Xj-Xk), wherein, XjAnd Xk
The signal of opposite in phase in the signal of the n passage included for ultrasonic signal X；
According to default composition algorithm, the symmetrical composite signal of ultrasonic signal Y is obtainedIts
In, YiIt is i-th signal of passage in ultrasonic signal Y；
Obtain the asymmetric composite signal Y of ultrasonic signal YFDC=Σ (Yj-Yk), wherein, YjAnd Yk
The signal of opposite in phase in the signal of the n passage included for ultrasonic signal Y.
Optionally, this leads to according to every group of symmetrical composite signal and asymmetric composite signal of the ultrasonic signal
Default superposition algorithm is crossed, positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals are obtained respectively
With negative sense asymmetrical signals, including：
According to the space D of ultrasonic probe, the wave velocity C of ultrasonic wave and the ultrasonic wave in the ultrasonic sensor
The sample frequency Fs of sensor, delay sampling points N y is determined by delay algorithm, and the delay algorithm is：
According to every group of symmetrical composite signal of the ultrasonic signal：XDC, YDCWith asymmetric composite signal XFDC,
YFDC, and delay sampling points N y, by default superposition algorithm, obtain respectively positive symmetric signal,
Negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals；
Wherein, positive symmetric signal is：ZDC=YDC+YNy(XDC)；
Negative sense symmetric signal is：FDC=XDC+YNy(YDC)；
Positive asymmetrical signals are：ZFDC=YFDC+YNy(XFDC)；
Negative sense asymmetrical signals are：FFDC=XFDC+YNy(YFDC)；
Wherein, YNy() is represented the Ny sampling number of signal delay in bracket.
Optionally, this to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and bears respectively
Hilbert transform is carried out to asymmetrical signals and LPF is filtered, obtain the boundary of the four width objects under test
Face image, including：
Respectively to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and the asymmetric letter of negative sense
Number Hilbert transform is carried out, extract the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals
With the envelope signal of negative sense asymmetrical signals；
Respectively to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and the asymmetric letter of negative sense
Number envelope signal carry out LPF, obtain the interface image of the four width objects under test.
In sum, a kind of ultrasonic imaging method provided in an embodiment of the present invention, the method can be by ultrasound
Wave sensor gathers two groups of ultrasonic signals of object under test, and every group of ultrasonic signal includes the n letter of passage
Number；According to default composition algorithm, the symmetrical composite signal of every group of ultrasonic signal and asymmetric is obtained respectively
Composite signal, and by default superposition algorithm, the positive symmetric signal of the object under test is obtained respectively, is born
To symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals, four kinds of signals are entered respectively again finally
Row Hilbert transform and LPF, obtain the interface image of four width objects under test.The ultrasonic imaging side
The ultrasonic signal that method is collected to ultrasonic sensor carried out Signal separator and direction and separated, and display is treated
The accurate higher of object interface image is surveyed, accuracy when defects detection is carried out to object interface is improve.
Fig. 2 is the flow chart of another ultrasonic imaging method provided in an embodiment of the present invention, and the method can be answered
For in ultrasonic image-forming system, the system to include ultrasonic sensor, and two are provided with the ultrasonic sensor
Group ultrasonic probe group, every group of ultrasonic probe group includes n ultrasonic probe, and the n is more than or equal to 2
Integer, as shown in Fig. 2 the method includes：
Step 201, two groups of ultrasonic signals that object under test is gathered by ultrasonic sensor, every group of ultrasound
Ripple signal includes the n signal of passage.
In embodiments of the present invention, 8 ultrasonic probes can be provided with the ultrasonic sensor, therefore
The ultrasonic sensor can collect 8 signals of passage, i.e. passage 1 to passage 8 by this 8 probes,
8 passages can both launch ultrasonic signal, it is also possible to received ultrasonic signal.In actual applications,
8 passages can be made with different centre frequencies (such as 2.25 megahertzs (MHz) or 5MHz etc.),
Signal is taken turns in transmitting 4.In each round signal emission process, each passage launches a ultrasonic signal,
Then 8 passages launch 8 ultrasonic signals altogether.During each channel emission ultrasonic signal, all of passage
The signal of interior of articles reflection is all detected and received simultaneously.Therefore, for each centre frequency, ultrasonic wave
Sensor can collect 8 × 8=64 group signals, and 64 groups of signals can be as shown in table 1.
Table 1
In order to save device memory and speeding up data transmission speed, can be by the 64 of each round groups of signals
The signal for repeating is deleted, so as to by 64 groups of Signal Compressions to 36 groups of signals, as shown in table 1.In figure
" √ " represents retention data, and "○" is represented deletes data.Example, passage 2 can be launched, lead to
The signal that road 1 is received retains, and passage 1 is launched, and the signal that passage 2 is received is deleted.
Example, in embodiments of the present invention, can by 8 channel receptions to signal be divided into two groups,
Every group includes 4 signals of passage, for example, first group of ultrasonic signal X can include passage 1,3,5
The signal received with 7：X1、X2、X3And X4, second group of ultrasonic signal Y can include passage 2,
4th, 6 and 8 signal for receiving：Y1、Y2、Y3And Y4。
Step 202, according to default composition algorithm, every group of symmetrical synthesis letter of the ultrasonic signal is obtained respectively
Number and asymmetric composite signal.
For two groups of ultrasonic signals X and Y, according to default composition algorithm, the ultrasonic signal of acquisition
The symmetrical composite signal of X can be：Wherein, XiFor i-th in ultrasonic signal X
The signal of passage.Example, it is assumed that the signal that passage 1,3,5 and 7 is received in ultrasonic signal X point
Not：X1、X2、X3And X4, then the symmetrical composite signal X of ultrasonic signal XDCCan be：
XDC=X1+X2+X3+X4。
The asymmetric composite signal of ultrasonic signal X can be：
XFDC=Σ (Xj-Xk),
Wherein, XjAnd XkThe signal of opposite in phase in the signal of the n passage included for ultrasonic signal X.
Example, it is assumed that in ultrasonic signal X, the signal that passage 1 and passage 5 are received is horizontal direction
(parallel with object under test surface) and the signal of opposite in phase, the signal that passage 3 and passage 7 are received is
The signal of vertical direction (vertical with object under test surface) and opposite in phase, then can obtain ultrasonic wave letter
The horizontal asymmetrical signal of number X is：X1-X3, vertical asymmetrical signals are：X2-X4, ultrasonic signal X
Asymmetric composite signal can be：XFDC=X1-X3+X2-X4。
Similarly, according to default composition algorithm, the symmetrical synthesis letter of ultrasonic signal Y can also be got
NumberWherein, YiIt is i-th signal of passage in ultrasonic signal Y；And the ultrasonic wave
The asymmetric composite signal of signal YWherein, YjAnd YkIt is ultrasonic signal Y
Including n passage signal in opposite in phase signal.
Step 203, according to the space D of ultrasonic probe, the wave velocity C of ultrasonic wave in the ultrasonic sensor
With the sample frequency Fs of the ultrasonic sensor, delay sampling points N y is determined by delay algorithm.
The delay algorithm is：
Example, it is assumed that space D=35 millimeter (mm) of ultrasonic probe in ultrasonic sensor, this surpasses
Sample frequency Fs=200 (KHz) kHz of sonic sensor, object under test is bonding circle of joint coating on pipeline
Face, wave velocity C=3250 metre per second (m/s) (m/s) of T mode ultrasonic wave in the pipeline, therefore according to above-mentioned delay
Algorithm can obtain delay sampling points：
Step 204, according to every group of symmetrical composite signal of the ultrasonic signal：XDC, YDCWith asymmetric conjunction
Into signal XFDC, YFDC, and delay sampling points N y, by default superposition algorithm, obtain respectively
Positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals.
Wherein, positive symmetric signal is：ZDC=YDC+YNy(XDC)；
Negative sense symmetric signal is：FDC=XDC+YNy(YDC)；
Positive asymmetrical signals are：ZFDC=YFDC+YNy(XFDC)；
Negative sense asymmetrical signals are：FFDC=XFDC+YNy(YFDC)；
Wherein, YNy() is represented the Ny sampling number of signal delay in bracket.Will ultrasonic signal
The symmetrical composite signal X of XDCAfter postponing at 2 points, you can the symmetrical composite signal Y after being postponedNy(XDC),
By the asymmetrical signals X of ultrasonic signal XFDCPostpone the asymmetrical signals Y after being postponed after 2 pointsNy
(XFDC).The symmetric signal Y of the ultrasonic signal Y after can also similarly being postponedNy(YDC) and prolong
The asymmetrical signals Y of the ultrasonic signal Y for laggingNy(YFDC)。
Step 205, respectively to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense
Asymmetrical signals carry out Hilbert transform, extract the positive symmetric signal, negative sense symmetric signal, forward direction non-
The envelope signal of symmetric signal and negative sense asymmetrical signals.
The process for extracting signal envelope by Hilbert transform may be referred to correlation technique, the embodiment of the present invention
This is not repeated.
Step 206, respectively to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense
The envelope signal of asymmetrical signals carries out LPF, obtains the interface image of the four width objects under test.
During due to extracting envelope by Hilbert transform, some high-frequency noises may be produced, by the forward direction
The envelope signal of symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals is carried out
LPF, can filter the high-frequency noise, improve the precision of signal, and then improve the interface figure of display
The accuracy of picture.
It should be noted that ultrasonic imaging method provided in an embodiment of the present invention is based on synthetic aperture focusing (English
Text：SyntheticAperture Focusing Technique；Referred to as：SAFT) one kind of ultrasonic imaging method
Improved method, ultrasonic imaging method provided in an embodiment of the present invention is perfect to be received to ultrasonic sensor
The processing procedure of signal, improves the accuracy of display image.
In sum, a kind of ultrasonic imaging method provided in an embodiment of the present invention, the method can be by ultrasound
Wave sensor gathers two groups of ultrasonic signals of object under test, and every group of ultrasonic signal includes the n letter of passage
Number；According to default composition algorithm, the symmetrical composite signal of every group of ultrasonic signal and asymmetric is obtained respectively
Composite signal, and by default superposition algorithm, the positive symmetric signal of the object under test is obtained respectively, is born
To symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals, four kinds of signals are entered respectively again finally
Row Hilbert transform and LPF, obtain the interface image of four width objects under test.The ultrasonic imaging side
The ultrasonic signal that method is collected to ultrasonic sensor carried out Signal separator and direction and separated, and display is treated
The accurate higher of object interface image is surveyed, accuracy when defects detection is carried out to object interface is improve.
Fig. 3 is a kind of structural representation of ultrasonic image-forming system provided in an embodiment of the present invention, as shown in figure 3,
The system can include：Ultrasonic sensor 301, the first acquisition module 302, the and of the second acquisition module 303
Signal processing module 304, can be provided with two groups of ultrasonic probe groups, every group in the ultrasonic sensor 301
The ultrasonic probe group includes n ultrasonic probe, and the n is the integer more than or equal to 2；
Ultrasonic sensor 301, two groups of ultrasonic signals for gathering object under test, every group of ultrasonic wave letter
Number include the signal of n passage.
First acquisition module 302, for according to default composition algorithm, every group of ultrasonic signal being obtained respectively
Symmetrical composite signal and asymmetric composite signal.
Second acquisition module 303, for the symmetrical composite signal according to every group of ultrasonic signal and asymmetric conjunction
Into signal, by default superposition algorithm, positive symmetric signal, the negative sense pair of the object under test are obtained respectively
Claim signal, positive asymmetrical signals and negative sense asymmetrical signals.
Signal processing module 304, for non-right to the positive symmetric signal, negative sense symmetric signal, forward direction respectively
Claiming signal and negative sense asymmetrical signals carries out Hilbert transform and LPF, obtains the four width objects under test
Interface image.
In sum, a kind of ultrasonic image-forming system provided in an embodiment of the present invention, the system can be by ultrasound
Wave sensor gathers two groups of ultrasonic signals of object under test, and every group of ultrasonic signal includes the n letter of passage
Number；According to default composition algorithm, the symmetrical composite signal of every group of ultrasonic signal and non-right is obtained respectively
Claim composite signal, and by default superposition algorithm, obtain respectively the object under test positive symmetric signal,
Negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals, finally again to four kinds of signal difference
Hilbert transform and LPF are carried out, the interface image of four width objects under test is obtained.The ultrasonic imaging
The ultrasonic signal that method is collected to ultrasonic sensor has carried out Signal separator and direction separates, display
Object under test interface image it is accurate higher, it is accurate when defects detection is carried out to object interface to improve
Property.
Optionally, first acquisition module 302, is additionally operable to：
According to default composition algorithm, the symmetrical composite signal of ultrasonic signal X is obtained
Wherein, XiIt is i-th signal of passage in ultrasonic signal X；
Obtain the asymmetric composite signal X of ultrasonic signal XFDC=Σ (Xj-Xk), wherein, XjAnd Xk
The signal of opposite in phase in the signal of the n passage included for ultrasonic signal X；
According to default composition algorithm, the symmetrical composite signal of ultrasonic signal Y is obtainedIts
In, YiIt is i-th signal of passage in ultrasonic signal Y；
Obtain the asymmetric composite signal Y of ultrasonic signal YFDC=Σ (Yj-Yk), wherein, YjAnd Yk
The signal of opposite in phase in the signal of the n passage included for ultrasonic signal Y.
Optionally, second acquisition module 303, is additionally operable to：
According to the space D of ultrasonic probe, the wave velocity C of ultrasonic wave and the ultrasonic wave in the ultrasonic sensor
The sample frequency Fs of sensor, delay sampling points N y is determined by delay algorithm, and the delay algorithm is：
According to every group of symmetrical composite signal of the ultrasonic signal：XDC, YDCWith asymmetric composite signal XFDC,
YFDC, and delay sampling points N y, by default superposition algorithm, obtain respectively positive symmetric signal,
Negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals；
Wherein, positive symmetric signal is：ZDC=YDC+YNy(XDC)；
Negative sense symmetric signal is：FDC=XDC+YNy(YDC)；
Positive asymmetrical signals are：ZFDC=YFDC+YNy(XFDC)；
Negative sense asymmetrical signals are：FFDC=XFDC+YNy(YFDC)；
Wherein, YNy() is represented the Ny sampling number of signal delay in bracket.
Optionally, the signal processing module 304, is additionally operable to：
Respectively to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and the asymmetric letter of negative sense
Number Hilbert transform is carried out, extract the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals
With the envelope signal of negative sense asymmetrical signals；
Respectively to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and the asymmetric letter of negative sense
Number envelope signal carry out LPF, obtain the interface image of the four width objects under test.
In sum, a kind of ultrasonic image-forming system provided in an embodiment of the present invention, the system can be by ultrasound
Wave sensor gathers two groups of ultrasonic signals of object under test, and every group of ultrasonic signal includes the n letter of passage
Number；According to default composition algorithm, the symmetrical composite signal of every group of ultrasonic signal and non-right is obtained respectively
Claim composite signal, and by default superposition algorithm, obtain respectively the object under test positive symmetric signal,
Negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals, finally again to four kinds of signal difference
Hilbert transform and LPF are carried out, the interface image of four width objects under test is obtained.The ultrasonic imaging
The ultrasonic signal that method is collected to ultrasonic sensor has carried out Signal separator and direction separates, display
Object under test interface image it is accurate higher, it is accurate when defects detection is carried out to object interface to improve
Property.
It is apparent to those skilled in the art that, for convenience and simplicity of description, foregoing description
System and module specific work process, may be referred to the corresponding process in preceding method embodiment, herein
Repeat no more.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all of the invention
Within spirit and principle, any modification, equivalent substitution and improvements made etc. should be included in of the invention
Within protection domain.
Claims (8)
1. a kind of ultrasonic imaging method, it is characterised in that methods described is applied to ultrasonic image-forming system, described
System includes ultrasonic sensor, and two groups of ultrasonic probe groups, every group are provided with the ultrasonic sensor
The ultrasonic probe group includes n ultrasonic probe, and the n is the integer more than or equal to 2, the side
Method includes：
Two groups of ultrasonic signals of object under test, ultrasonic wave described in every group are gathered by the ultrasonic sensor
Signal includes the n signal of passage；
According to default composition algorithm, the symmetrical composite signal of ultrasonic signal described in every group and non-is obtained respectively
Symmetrical composite signal；
The symmetrical composite signal and asymmetric composite signal of ultrasonic signal according to every group, by default
Superposition algorithm, obtains the positive symmetric signal of the object under test, negative sense symmetric signal, positive non-right respectively
Claim signal and negative sense asymmetrical signals；
It is asymmetric to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense respectively
Signal carries out Hilbert transform and LPF, obtains the interface image of object under test described in four width.
2. method according to claim 1, it is characterised in that described according to default composition algorithm,
The symmetrical composite signal and asymmetric composite signal of ultrasonic signal X and Y described in every group are obtained respectively, including：
According to default composition algorithm, the symmetrical composite signal of the ultrasonic signal X is obtained
Wherein, XiIt is i-th signal of passage in the ultrasonic signal X；
Obtain the asymmetric composite signal X of the ultrasonic signal XFDC=Σ (Xj-Xk), wherein, XjWith
XkThe signal of opposite in phase in the signal of the n passage included for the ultrasonic signal X；
According to default composition algorithm, the symmetrical composite signal of the ultrasonic signal Y is obtained
Wherein, YiIt is i-th signal of passage in the ultrasonic signal Y；
Obtain the asymmetric composite signal Y of the ultrasonic signal YFDC=Σ (Yj-Yk), wherein, YjWith
YkThe signal of opposite in phase in the signal of the n passage included for the ultrasonic signal Y.
3. method according to claim 2, it is characterised in that the letter of the ultrasonic wave according to every group
Number symmetrical composite signal and asymmetric composite signal, by default superposition algorithm, obtain positive right respectively
Claim signal, negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals, including：
According to the space D of ultrasonic probe in the ultrasonic sensor, the wave velocity C of ultrasonic wave and described super
The sample frequency Fs of sonic sensor, delay sampling points N y, the delay algorithm are determined by delay algorithm
For：
The symmetrical composite signal of ultrasonic signal according to every group：XDC, YDCWith asymmetric composite signal
XFDC, YFDC, and the delay sampling points N y, by default superposition algorithm, obtain respectively positive
Symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals；
Wherein, positive symmetric signal is：ZDC=YDC+YNy(XDC)；
Negative sense symmetric signal is：FDC=XDC+YNy(YDC)；
Positive asymmetrical signals are：ZFDC=YFDC+YNy(XFDC)；
Negative sense asymmetrical signals are：FFDC=XFDC+YNy(YFDC)；
Wherein, YNy() is represented the Ny sampling number of signal delay in bracket.
4. according to any described method of claims 1 to 3, it is characterised in that it is described respectively to it is described just
Hilbert is carried out to symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals
Conversion and LPF are filtered, and obtain the interface image of object under test described in four width, including：
It is asymmetric to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense respectively
Signal carries out Hilbert transform, extracts the positive symmetric signal, negative sense symmetric signal, forward direction asymmetric
The envelope signal of signal and negative sense asymmetrical signals；
It is asymmetric to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense respectively
The envelope signal of signal carries out LPF, obtains the interface image of object under test described in four width.
5. a kind of ultrasonic image-forming system, it is characterised in that the system includes：Ultrasonic sensor, first
Acquisition module, the second acquisition module and signal processing module, are provided with two groups and surpass in the ultrasonic sensor
Sonic probe group, ultrasonic probe group described in every group includes n ultrasonic probe, and the n is more than or equal to 2
Integer；
The ultrasonic sensor, two groups of ultrasonic signals for gathering object under test, ultrasound described in every group
Ripple signal includes the n signal of passage；
First acquisition module, for according to default composition algorithm, ultrasonic wave described in every group being obtained respectively
The symmetrical composite signal and asymmetric composite signal of signal；
Second acquisition module, symmetrical composite signal for the ultrasonic signal according to every group and non-right
Claim composite signal, by default superposition algorithm, obtain respectively the object under test positive symmetric signal,
Negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals；
The signal processing module, for respectively to the positive symmetric signal, negative sense symmetric signal, forward direction
Asymmetrical signals and negative sense asymmetrical signals carry out Hilbert transform and LPF, obtain being treated described in four width
Survey the interface image of object.
6. system according to claim 5, it is characterised in that first acquisition module, is additionally operable to：
According to default composition algorithm, the symmetrical composite signal of the ultrasonic signal X is obtained
Wherein, XiIt is i-th signal of passage in the ultrasonic signal X；
Obtain the asymmetric composite signal X of the ultrasonic signal XFDC=Σ (Xj-Xk), wherein, XjWith
XkThe signal of opposite in phase in the signal of the n passage included for the ultrasonic signal X；
According to default composition algorithm, the symmetrical composite signal of the ultrasonic signal Y is obtained
Wherein, YiIt is i-th signal of passage in the ultrasonic signal Y；
Obtain the asymmetric composite signal Y of the ultrasonic signal YFDC=Σ (Yj-Yk), wherein, YjWith
YkThe signal of opposite in phase in the signal of the n passage included for the ultrasonic signal Y.
7. system according to claim 6, it is characterised in that second acquisition module, is additionally operable to：
According to the space D of ultrasonic probe in the ultrasonic sensor, the wave velocity C of ultrasonic wave and described super
The sample frequency Fs of sonic sensor, delay sampling points N y, the delay algorithm are determined by delay algorithm
For：
The symmetrical composite signal of ultrasonic signal according to every group：XDC, YDCWith asymmetric composite signal
XFDC, YFDC, and the delay sampling points N y, by default superposition algorithm, obtain respectively positive
Symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense asymmetrical signals；
Wherein, positive symmetric signal is：ZDC=YDC+YNy(XDC)；
Negative sense symmetric signal is：FDC=XDC+YNy(YDC)；
Positive asymmetrical signals are：ZFDC=YFDC+YNy(XFDC)；
Negative sense asymmetrical signals are：FFDC=XFDC+YNy(YFDC)；
Wherein, YNy() is represented the Ny sampling number of signal delay in bracket.
8. according to any described system of claim 5 to 7, it is characterised in that the signal processing module,
It is additionally operable to：
It is asymmetric to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense respectively
Signal carries out Hilbert transform, extracts the positive symmetric signal, negative sense symmetric signal, forward direction asymmetric
The envelope signal of signal and negative sense asymmetrical signals；
It is asymmetric to the positive symmetric signal, negative sense symmetric signal, positive asymmetrical signals and negative sense respectively
The envelope signal of signal carries out LPF, obtains the interface image of object under test described in four width.
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