CN103926320B - A kind of non-linear ultrasonic imaging detection method based on autoscan - Google Patents
A kind of non-linear ultrasonic imaging detection method based on autoscan Download PDFInfo
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Abstract
The invention belongs to technical field of nondestructive testing, it relates to a kind of non-linear ultrasonic imaging detection method based on autoscan. The realization of the inventive method mainly comprises non-linear ultrasonic unit, non-linear ultrasonic detection signal acquisition, non-linear ultrasonic imaging. Non-linear ultrasonic unit is made up of ultrasonic automatic scanning test set, transmitting transducer, receiving transducer, ultrasound unit, pre-process device etc. Non-linear ultrasonic detection signal is obtained by transmitting transducer and receiving transducer. Non-linear ultrasonic imaging comprises imaging position data construct and imaging display is divided into, it is determined that the key steps such as autoscan mode, part are installed, optimum configurations, scanning imagery. The ultrasonic automatic scanning test set of 1-6 Coordinate-free degree can be selected, realize different shapes, size and structure, the high-resolution non-linear ultrasonic autoscan image checking of part highly sensitive, considerably improve Detection capability and the reliability of close property defect and microscopic defect.
Description
Technical field
The invention belongs to technical field of nondestructive testing, it relates to a kind of non-linear ultrasonic imaging detection method based on autoscan.
Background technology
Along with the applying in the core industry field such as aerospace, traffic such as matrix material and diffusion welding, it is necessary to matrix material and diffusion welding linkage interface to installation application carry out nondestructive testing, it is ensured that the quality of installation structure and military service safety. Be close to owing to linkage interface defect in matrix material and diffusion welding has, trickle feature, require to adopt all detection methods to have sufficiently high detection sensitivity and detection resolution, the nondestructive testing of the actual part in the matrix material of Engineering Oriented level and diffusion welding welded construction manufacturing processed, the ultrasonic method mainly adopted: the A-display that (1) utilizes ultrasonic manual scanning to show according to ultrasonic test instrument by testing staff carries out defect estimation; (2) utilize ultrasonic automatic scanning, realized matrix material and the nondestructive testing of diffusion welding welded construction linkage interface defect by ultrasonic scanning formation method. Outstanding deficiency is: (1) these two kinds of methods are at present mainly based on the linear ultrasonic Cleaning Principle of routine, linkage interface close property defect and microscopic defect is insensitive, resolving power is poor, although improving the frequency of ultrasonic test, ultrasonic method can be realized to a certain extent linkage interface close property defect and microscopic defect are detected lifting that is sensitive and resolving power, but the raising of detection frequency, the decay of sound wave is violent, detection thickness is restricted, detection signal, to the quite sensitive of the coupling of high frequency ultrasound transverter and attitude, directly affects the reliability of detection; (2) the big amplitude that some is close to, linear ultrasound is caused by fine connection defect around defect is insensitive, it is easy to cause missing inspection; (3) raising detecting frequency can cause the sharply increase of testing cost, even causes being difficult to the ultrasonic test realizing actual part.
Summary of the invention
It is an object of the invention to for matrix material and diffusion welding welded construction, a kind of non-linear ultrasonic imaging detection method based on autoscan is proposed, realize matrix material and the welded non-linear ultrasonic image checking of diffusion welding, improve the sensitivity of ultrasonic test and resolving power, it is to increase fine in linkage interface is close to the Detection capability of defect and the reliability of detection. The technical solution of the present invention is, 1) and non-linear ultrasonic unit
Non-linear ultrasonic unit comprises ultrasonic automatic scanning test set, transmitting transducer, receiving transducer, ultrasound unit, pre-process device,
Transmitting transducer and receiving transducer adopt ultrasonic water jet pulse transverter, two transverters are arranged on two transverter mount pads in the scanning mechanism in ultrasonic automatic scanning test set respectively, under transmitting transducer and the receiving transducer scanning mechanism in ultrasonic automatic scanning test set controls, realize the non-linear ultrasonic autoscan to detected part, the frequency of transmitting transducer and receiving transducer is according to the material acoustics characteristic of detected part, detection sensitivity requires to select, the frequency pairing of transmitting transducer and receiving transducer uses, transmitting transducer is connected with the signal output terminal of ultrasound unit by radioshielding cable, receiving transducer is connected with the signal input terminus of pre-process device by radioshielding cable,
Ultrasound unit provides wideband-short pulse actuation signal, stimulated emission transverter produces ultrasonic pulsative signal, propagate in detected part by coupling medium, the actuation signal bandwidth 100MHz of ultrasound unit, amplitude at least covers 200V��400V, and ultrasound unit is arranged on ultrasonic automatic scanning test set;
Pre-process device carries out signal by high frequency signal cable with the signal processing unit in ultrasonic automatic scanning test set and is connected, and pre-process device is that wideband-short pulse amplifies circuit, preposition gain 10dB��30dB, signal bandwidth 100MHz;
2) non-linear ultrasonic detection signal acquisition,
Non-linear ultrasonic detection signal is obtained by transmitting transducer and receiving transducer:
The incident ultrasound pulse signal formed in detected part with transmitting transducer is propagated along detected part thickness direction, then the ultrasonic pulsative signal that transmitting transducer is formed in detected part,
Receiving transducer, obtains the ultrasonic pulsative signal formed in detected part,
Then the signal processing unit in ultrasonic automatic scanning test set is utilized by pre-process device, carry out digitized processing, the harmonic signal extracted by receiving transducer is converted to numerary signal, deliver to the control in ultrasonic automatic scanning test set and tomography computer internal memory, for follow-up non-linear ultrasonic imaging;
3) non-linear ultrasonic imaging,
1. imaging position data construct
Detected part is carried out autoscan by ultrasonic automatic scanning test set control transmitting transducer and receiving transducer, harmonic signal after the digitized processing of the signal processing unit in ultrasonic automatic scanning test set, according to Scanning Detction point location matrix sequential manner, in the control being stored in ultrasonic automatic scanning test set and tomography computer internal memory, by R scan line in check point location matrix, often row C check point forms the check point location matrix P of R �� C, as sequence, store harmonic signal data, it is formed into image position and puts data matrix Q, thus set up the one-to-one relationship between location matrix P and imaging position data matrix Q, carry out the management of non-linear ultrasonic autoscan imaging data,
2. imaging display
According to the imaging position data matrix Q built, according to the modulation system of selected color/gray level code, utilize the control in ultrasonic automatic scanning test set and tomography computer, by scanning imagery by imaging position data matrix Q, be converted to the acceptable Show Color/gray scale of the imaging display unit in ultrasonic automatic scanning test set, thus realize the non-linear ultrasonic imaging to detected part;
The step of the non-linear ultrasonic image checking of autoscan is,
1. autoscan mode is determined
Material according to detected part, structure and testing requirement, select ultrasonic automatic scanning test set, it is determined that the installation position of transmitting transducer and receiving transducer and Bai Jiao,
2. part is installed
The detection station that detected part is arranged on selected ultrasonic automatic scanning test set, check errorless after, switch on power, open detection equipment, and enter non-linear ultrasonic autoscan image checking window,
3. optimum configurations
Sequence of control loads and self-inspection; Sweep velocity, stepping, sweep limit sweep parameter are set; Sample frequency is set, signal gate detect parameters and harmonic coefficient,
4. scanning imagery
A) judge whether to start autoscan, if not entering autoscan, then etc. to be scanned, otherwise perform next step;
B) line scanning is started;
C) position signal and harmonic signal that detect position point j is obtained in current line scanning;
D) harmonic signal is converted into imaging data;
E) imaging data buffer memory;
F) judge whether terminate when moving ahead, as do not terminated, repeated execution of steps c) to e); If terminating, putting when the imaging data that moves ahead is saved in the data matrix Q of imaging position corresponding line position, and showing current scan line image;
G) judge whether part scanning completes, as unfinished, after scanning stepping, repeating step b) to f); If having completed part scanning, terminating scanning, entering image analysis.
The frequency pairing system of selection of described transmitting transducer and receiving transducer is, f2=nf1, wherein, f1For the frequency of transmitting transducer, n is harmonic coefficient, is a round values, and n { is selecting between 1,2,3,4,5,6,7,8,9,10}, f2For the frequency of receiving transducer.
On the both sides transverter mount pad of the scanning mechanism that described transmitting transducer and receiving transducer are arranged in ultrasonic automatic scanning test set respectively, or on same side transverter mount pad in the scanning mechanism being arranged in ultrasonic automatic scanning test set, the deflection pendulum angle setting range+90 �㡫-90 �� of transmitting transducer and receiving transducer, it is achieved the transmitting of ultrasonic signal and the relation of reception.
Described ultrasonic automatic scanning test set, according to the geometrical shape of detected part and size characteristics, selects the ultrasonic automatic scanning test set of 1-6 Coordinate-free degree, it is achieved the non-linear ultrasonic autoscan of different shapes, size and structural parts.
The advantage that the present invention has and useful effect,
1. for matrix material and diffusion welding engineering structure, the present invention proposes a kind of non-linear ultrasonic imaging detection method based on autoscan, considerably improve ultrasonic test to the detection sensitivity of matrix material and diffusion welding linkage interface close property defect and microscopic defect and resolving power, what namely ensure that ultrasonic test has enough penetration thicknesses, have and can realize ultrasonic method to the lifting of linkage interface close property defect and the microscopic defect sensitive and resolving power of detection, overcome high frequency sound wave to detecting the limited of thickness, avoid the detection erroneous judgement that the quite sensitive of the coupling of high frequency ultrasound transverter and attitude is caused by detection signal,
2. utilize the non-linear ultrasonic imaging detection method based on autoscan that the present invention proposes, overcome matrix material and diffusion welding engineering structure linkage interface is close to, linear ultrasound is caused by fine connection defect around defect the insensitive problem easily causing missing inspection of big amplitude, thus significantly improve be close to, the Detection capability of microscopic defect and reliability;
3. utilize the non-linear ultrasonic imaging detection method based on autoscan that the present invention proposes, it is possible to realized the high-resolution ultra sonic imaging detection of highly sensitive of actual part by cost effective method.
Accompanying drawing explanation
Fig. 1 is the non-linear ultrasonic unit composition frame chart of the present invention for non-linear ultrasonic autoscan imaging detection method;
Fig. 2 is the non-linear ultrasonic detection signal acquiring method schematic diagram of the present invention based on receiving transducer 2;
Fig. 3 is the non-linear ultrasonic detection signal acquiring method schematic diagram of the present invention based on transport function;
Fig. 4 is the non-linear ultrasonic imaging step of the present invention based on autoscan.
Embodiment
The inventive method is made up of non-linear ultrasonic image checking step 4 the part of non-linear ultrasonic unit, non-linear ultrasonic detection signal acquiring method, non-linear ultrasonic imaging, autoscan.
1) non-linear ultrasonic unit
Non-linear ultrasonic unit for the non-linear ultrasonic imaging detection method of autoscan comprises ultrasonic automatic scanning test set, transmitting transducer 1, receiving transducer 2, ultrasound unit 3, pre-process device 4, as shown in Figure 1;
Transmitting transducer 1 and receiving transducer 2, design adopts water jet pulse transverter, it is arranged on respectively on two transverter mount pads in the scanning mechanism 9 in ultrasonic automatic scanning test set, under transmitting transducer 1 and receiving transducer 2 scanning mechanism 9 in ultrasonic automatic scanning test set controls, realize the non-linear ultrasonic autoscan to detected part, the frequency of transmitting transducer 1 and receiving transducer 2 is according to the material acoustics characteristic of detected part, detection sensitivity requirement etc. is selected, piezoelectric can be utilized to carry out special design, the commercially available transverter that can mate mutually can also be selected with the transverter mount pad in scanning mechanism 9, recommend the FJ series wideband-short pulse transverter preferentially selecting matrix material limited liability company of Air China to produce, form transmitting transducer 1 and receiving transducer 2, transmitting transducer 1 and receiving transducer 2 require that pairing uses, transmitting transducer 1 is connected with the signal output terminal of ultrasound unit 3 by radioshielding cable, receiving transducer 2 is connected with the signal input terminus of pre-process device 4 by radioshielding cable,
Ultrasound unit 3, design adopts high-voltage pulse circuit, form wideband-short pulse actuation signal, stimulated emission transverter 1 produces ultrasonic pulsative signal, propagate in detected part by liquid coupling mediums such as water, the actuation signal bandwidth 100MHz of ultrasound unit 3, the amplitude that ultrasound unit 3 exports wideband-short pulse actuation signal at least covers 200V��400V, can also according to this requirement, carry out market to choose, the UPower Series ultrasonic signal source selecting matrix material limited liability company of Air China to produce is recommended to form ultrasound unit 3, ultrasound unit 3 is arranged on position nearest from transmitting transducer 1 in ultrasonic automatic scanning test set,
Pre-process device 4 carries out signal by high frequency signal cable with the signal processing unit 5 in ultrasonic automatic scanning test set and is connected, pre-process device 4 designs and adopts wideband-short pulse to amplify circuit formation, preposition gain 10dB��30dB, signal bandwidth 100MHz, can also according to this requirement, carry out market to choose, recommend the FD series Special pulse ultrasonic signal pre-process device selecting matrix material limited liability company of Air China to produce to form pre-process device 4;
2) non-linear ultrasonic detection signal acquiring method,
1. mating and combine acquisition non-linear ultrasonic and detect signal by transmitting transducer 1 and receiving transducer 2:
The incident ultrasound pulse signal formed in detected part for transmitting transducer 1 is propagated along detected part thickness direction, then the ultrasonic pulsative signal that transmitting transducer 1 is formed in detected part can represent and is:
Here, the ultrasonic pulsative signal that u (x, t) is formed in detected part for transmitting transducer 1, he is made up of fundamental signal and harmonic signal, wherein,
For the fundamental signal in incident ultrasound pulse signal,In superscript < 1f1In > 1 represents 1 subharmonic, i.e. base ripple, superscript < 1f1< f in >1> represents the frequency of fundamental signal,In subscript 1 represent the meaning of fundamental signal, A1Represent the amplitude of fundamental signal, as follows reason,
For the second harmonic signal in incident ultrasound pulse signal,
For the n rd harmonic signal in incident ultrasound pulse signal,
X is incident acoustic wave propagation direction, such as detected part thickness direction,
T is the travel-time,
By selecting the receiving transducer 2 identical with fundamental signal frequency corresponding in formula 1, corresponding fundamental signal in ultrasonic pulsative signal u (x, t) formed in detected part can be obtained, as shown in Figure 2, such as,
When selecting n=1, it is 1f by frequency1Receiving transducer 2 obtain the fundamental signal in u (x, t)
When selecting n=2, it is 2f by frequency1Receiving transducer 2 obtain the second harmonic signal in u (x, t)
N { is selecting between 1,2,3,4,5,6,7,8,9,10}, is being nf by different n value respective frequencies1Receiving transducer 2 can obtain the n rd harmonic signal in u (x, t)
According to the harmonic signal selected, utilize the harmonic signal that corresponding receiving transducer 2 extracts, then the signal processing unit 5 in ultrasonic automatic scanning test set is utilized, carry out digitized processing, the harmonic signal that receiving transducer 2 extracts is converted to numerary signal, send the control in ultrasonic automatic scanning test set and tomography computer 6 internal memory, for follow-up non-linear ultrasonic imaging.
2. non-linear ultrasonic detection signal is obtained by building signal transfer function,
Frequency according to selected transmitting transducer 1, control in ultrasonic automatic scanning test set and tomography computer 6, build the signal transmission H of corresponding different harmonic coefficient n by software program methodn(nf1), n is { 1,2,3,4,5 here, select between 6,7,8,9,10}, the harmonic signal of the corresponding given frequency of each signal transfer function, from ultrasonic pulsative signal u (x, t), corresponding harmonic signal is extracted respectively, as shown in Figure 3, such as by signal transfer function
When selecting n=1, it is 1f by frequency1Signal transfer function H1(1f1) obtain the fundamental signal in u (x, t)
When selecting n=2, it is 2f by frequency1Signal transfer function H2(2f1) obtain the second harmonic signal in u (x, t)
N { is selecting between 1,2,3,4,5,6,7,8,9,10}, is being nf by frequency1Signal transfer function Hn(nf1) obtain the n rd harmonic signal in u (x, t)
Ultrasonic pulsative signal u (the x that receiving transducer 2 receives, t), by utilizing the signal processing unit 5 in ultrasonic automatic scanning test set, after carrying out digitized processing, send the control in ultrasonic automatic scanning test set and tomography computer 6 internal memory, again by the harmonic signal selected by the signal transfer function extraction set up in control with tomography computer 6, for non-linear ultrasonic imaging.
3) non-linear ultrasonic imaging
1. imaging position data construct
First detected part 10 is being carried out in autoscan process by ultrasonic automatic scanning test set, harmonic signal after the digitizing of the signal processing unit 5 in ultrasonic automatic scanning test set, according to Scanning Detction point location matrix sequential manner, in the control being stored in ultrasonic automatic scanning test set and tomography computer 6 internal memory, when detected part is relatively big or harmonic signal data volume is bigger, virtual memory can be set up in control with the hard disk of tomography computer 6, store in autoscan process the harmonic signal data formed, by R scan line in check point location matrix, often row C check point forms the check point location matrix P of R �� C, as sequence, store harmonic signal data, it is formed into image position and puts data matrix Q, thus check point sets up the one_to_one corresponding between location matrix P and imaging position data matrix Q, carry out the management of non-linear ultrasonic autoscan imaging data.
2. imaging display
Imaging display is exactly according to the imaging position data matrix Q built, according to the modulation system of selected color/gray level code, utilize the control in ultrasonic automatic scanning test set and tomography computer 6, by the harmonic signal data of software programming by each check point position corresponding, image position put data matrix Q, be converted to the acceptable Show Color/gray scale of the imaging display unit 7 in ultrasonic automatic scanning test set, thus realize the non-linear ultrasonic imaging to detected part 10.
4) step of the non-linear ultrasonic image checking of autoscan
1. autoscan mode is determined
Material according to detected part, structure and testing requirement etc., select ultrasonic automatic scanning test set, it is determined that the installation position of transmitting transducer 1 and receiving transducer 2 and Bai Jiao.
2. part is installed
The detection station that detected part 10 is arranged on selected ultrasonic automatic scanning test set, check errorless after, switch on power, open detection equipment, and enter non-linear ultrasonic autoscan image checking window.
3. optimum configurations
Sequence of control loads and self-inspection; The sweep parameters such as sweep velocity, stepping, sweep limit are set; Sample frequency is set, the detect parameters such as gate; Selected harmonic coefficient and harmonic wave signal acquisition behavior etc.
4. scanning imagery detection
A) judge whether to start autoscan, if not entering autoscan, then etc. to be scanned, otherwise carry out next step;
B) line scanning is started;
C) position signal and harmonic signal that detect position point j is obtained in current line scanning
D) harmonic signalIt is converted into imaging data;
E) imaging data buffer memory;
F) judge whether terminate when moving ahead, as do not terminated, repeated execution of steps c) to e); If terminated, when the imaging data that moves ahead is saved in corresponding row position in the data matrix Q of imaging position, and show current scan line image;
G) judge whether part scanning completes, as unfinished, after scanning stepping, repeating step b) to f); If having completed part scanning, terminating scanning, entering image analysis. Shown in Figure 4.
Transmitting transducer 1 matches with receiving transducer 2 and uses, and transmitting transducer 1 with the system of selection of receiving transducer 2 is, f2=nf1, here, f1For the frequency of transmitting transducer 1, n is harmonic coefficient, is a round values, and general n can { selected between 1,2,3,4,5,6,7,8,9,10}, f2For the frequency of receiving transducer 2.
Transmitting transducer 1 and receiving transducer 2 can on the both sides transverter mount pads in the scanning mechanism 9 installed in ultrasonic automatic scanning test set, can also install on the same side transverter mount pad in the scanning mechanism 9 in ultrasonic automatic scanning test set, the deflection pendulum angle variable range+90 �㡫-90 �� of transmitting transducer 1 and receiving transducer 2, realize transmitting and the reception relation of ultrasonic signal, to realize different part reflective-mode or to penetrate mode nonlinearities ultra sonic imaging detection.
The feature such as geometrical shape and size according to detected part, select the ultrasonic automatic scanning test set of 1-6 Coordinate-free degree, realize the non-linear ultrasonic autoscan of different shapes, size and structural parts, MUI and the CUS Series ultrasonic autoscan test set that matrix material limited liability company of recommendation Air China produces.
Claims (4)
1., based on a non-linear ultrasonic imaging detection method for autoscan, it is characterized in that,
1) non-linear ultrasonic unit
Non-linear ultrasonic unit comprises ultrasonic automatic scanning test set, transmitting transducer (1), receiving transducer (2), ultrasound unit (3), pre-process device (4),
Transmitting transducer (1) and receiving transducer (2) adopt ultrasonic water jet pulse transverter, on two transverter mount pads in the scanning mechanism (9) that two transverters are arranged in ultrasonic automatic scanning test set respectively, under transmitting transducer (1) and receiving transducer (2) scanning mechanism (9) in ultrasonic automatic scanning test set controls, realize the non-linear ultrasonic autoscan to detected part, the frequency of transmitting transducer (1) and receiving transducer (2) is according to the material acoustics characteristic of detected part, detection sensitivity requires to select, transmitting transducer (1) uses with the frequency pairing of receiving transducer (2), transmitting transducer (1) is connected by the signal output terminal of radioshielding cable with ultrasound unit (3), receiving transducer (2) is connected by the signal input terminus of radioshielding cable with pre-process device (4),
Ultrasound unit (3) provides wideband-short pulse actuation signal, stimulated emission transverter (1) produces ultrasonic pulsative signal, propagate in detected part by coupling medium, the actuation signal bandwidth 100MHz of ultrasound unit (3), amplitude covers 200V��400V, and ultrasound unit (3) is arranged on ultrasonic automatic scanning test set;
Pre-process device (4) carries out signal by high frequency signal cable with the signal processing unit (5) in ultrasonic automatic scanning test set and is connected, pre-process device (4) is wideband-short pulse amplification circuit, preposition gain 10dB��30dB, signal bandwidth 100MHz;
2) non-linear ultrasonic detection signal acquisition
Non-linear ultrasonic detection signal is obtained by transmitting transducer (1) and receiving transducer (2):
The incident ultrasound pulse signal formed in detected part with transmitting transducer (1) is propagated along detected part thickness direction, then transmitting transducer (1) forms ultrasonic pulsative signal in detected part,
Receiving transducer (2), obtains the ultrasonic pulsative signal formed in detected part,
Then the signal processing unit (5) in ultrasonic automatic scanning test set is utilized by pre-process device (4), carry out digitized processing, the harmonic signal that receiving transducer (2) extracts is converted to numerary signal, deliver to the control in ultrasonic automatic scanning test set and tomography computer (6) internal memory, for follow-up non-linear ultrasonic imaging;
3) non-linear ultrasonic imaging
1. imaging position data construct
Detected part (10) is carried out autoscan by ultrasonic automatic scanning test set control transmitting transducer (1) and receiving transducer (2), harmonic signal after the digitized processing of the signal processing unit (5) in ultrasonic automatic scanning test set, according to Scanning Detction point location matrix sequential manner, in the control being stored in ultrasonic automatic scanning test set and tomography computer (6) internal memory, by R scan line in check point location matrix, often row C check point forms the check point location matrix P of R �� C, as sequence, store harmonic signal data, it is formed into image position and puts data matrix Q, thus set up the one-to-one relationship between location matrix P and imaging position data matrix Q, carry out the management of non-linear ultrasonic autoscan imaging data,
2. imaging display
According to the imaging position data matrix Q built, according to the modulation system of selected color/gray level code, utilize the control in ultrasonic automatic scanning test set and tomography computer (6), by scanning imagery by imaging position data matrix Q, be converted to the acceptable Show Color/gray scale of imaging display unit (7) in ultrasonic automatic scanning test set, thus realize the non-linear ultrasonic imaging to detected part (10);
The step of the non-linear ultrasonic image checking of autoscan is,
1. autoscan mode is determined
Material according to detected part, structure and testing requirement, select ultrasonic automatic scanning test set, it is determined that the installation position of transmitting transducer (1) and receiving transducer (2) and Bai Jiao,
2. part is installed
The detection station that detected part (10) is arranged on selected ultrasonic automatic scanning test set, check errorless after, switch on power, open detection equipment, and enter non-linear ultrasonic autoscan image checking window,
3. optimum configurations
Sequence of control loads and self-inspection; Sweep velocity, stepping, sweep limit sweep parameter are set; Sample frequency is set, signal gate detect parameters and harmonic coefficient,
4. scanning imagery
A) judge whether to start autoscan, if not entering autoscan, then etc. to be scanned, otherwise perform next step;
B) line scanning is started;
C) position signal and harmonic signal that detect position point j is obtained in current line scanning;
D) harmonic signal is converted into imaging data;
E) imaging data buffer memory;
F) judge whether terminate when moving ahead, as do not terminated, repeated execution of steps c) to e); If terminating, putting when the imaging data that moves ahead is saved in the data matrix Q of imaging position corresponding line position, and showing current scan line image;
G) judge whether part scanning completes, as unfinished, after scanning stepping, repeating step b) to f); If having completed part scanning, terminating scanning, entering image analysis.
2. a kind of non-linear ultrasonic imaging detection method based on autoscan according to claim 1, is characterized in that, described transmitting transducer (1) with the frequency pairing system of selection of receiving transducer (2) is, f2=nf1, wherein, f1For the frequency of transmitting transducer (1), n is harmonic coefficient, is a round values, and n { is selecting between 1,2,3,4,5,6,7,8,9,10}, f2For the frequency of receiving transducer (2).
3. a kind of non-linear ultrasonic imaging detection method based on autoscan according to claim 1, it is characterized in that, on the both sides transverter mount pad of the scanning mechanism (9) that described transmitting transducer (1) and receiving transducer (2) are arranged in ultrasonic automatic scanning test set respectively, or on same side transverter mount pad in the scanning mechanism being arranged in ultrasonic automatic scanning test set (9), the deflection pendulum angle setting range+90 �㡫-90 �� of transmitting transducer (1) and receiving transducer (2), realize transmitting and the reception relation of ultrasonic signal.
4. a kind of non-linear ultrasonic imaging detection method based on autoscan according to claim 1, it is characterized in that, described ultrasonic automatic scanning test set is according to the geometrical shape of detected part and size characteristics, select the ultrasonic automatic scanning test set of 1-6 Coordinate-free degree, it is achieved the non-linear ultrasonic autoscan of different shapes, size and structural parts.
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