阅读说明：本技术 用于相控阵超声检测的空间自由扫查成像系统及方法 (Space free scanning imaging system and method for phased array ultrasonic detection ) 是由 周昌智 黄财良 卢志鹏 赵德斌 朱若凡 黄斐 林坚 黄凯华 刘思明 于 2021-08-13 设计创作，主要内容包括：本发明提供了用于相控阵超声检测的空间自由扫查成像系统及方法,包括双频信号发射单元、数据采集系统、空间信息重构单元、相控阵数据处理单元和空间成像单元；双频信号发射单元包括空间定位源与超声成像检测发射源,空间定位源包括一个以上超声换能器,超声换能器以恒定频率向空间中发射周向或半周向超声波信号；超声成像检测单元包括相控阵超声检测探头,数据采集系统包括空间定位信号采集单元与超声成像检测信号接收传感器,空间定位信号采集单元与接收电路连接；突破传统相控阵数据采集端子仅用于结构数据采集的使用范围,解决便携式相控阵超声检测系统在使用时编码复杂、误差大等实际问题,实现信标节点位置自动捕获与数据采集端子的追踪。(The invention provides a space free scanning imaging system and a space free scanning imaging method for phased array ultrasonic detection, wherein the space free scanning imaging system comprises a dual-frequency signal transmitting unit, a data acquisition system, a space information reconstruction unit, a phased array data processing unit and a space imaging unit; the dual-frequency signal transmitting unit comprises a space positioning source and an ultrasonic imaging detection transmitting source, wherein the space positioning source comprises more than one ultrasonic transducer, and the ultrasonic transducer transmits circumferential or semi-circumferential ultrasonic signals to the space at a constant frequency; the ultrasonic imaging detection unit comprises a phased array ultrasonic detection probe, the data acquisition system comprises a space positioning signal acquisition unit and an ultrasonic imaging detection signal receiving sensor, and the space positioning signal acquisition unit is connected with the receiving circuit; the application range that traditional phased array data acquisition terminal only was used for structural data to gather is broken through, the practical problems such as portable phased array ultrasonic testing system is complicated, the error is big when using are solved, realize that beacon node position automatic acquisition and data acquisition terminal's pursuit.)

1. The space free scanning imaging system for phased array ultrasonic detection is characterized by comprising a dual-frequency signal transmitting unit, a data acquisition system, a space information reconstruction unit, a phased array data processing unit and a space imaging unit;

the dual-frequency signal transmitting unit comprises a space positioning source and an ultrasonic imaging detection transmitting source, wherein the space positioning source comprises more than one ultrasonic transducer, and the ultrasonic transducer transmits circumferential or semi-circumferential ultrasonic signals into space at constant frequency;

the ultrasonic imaging detection unit comprises a phased array ultrasonic detection probe, and the phased array ultrasonic detection probe is continuously excited to form ultrasonic waves for detecting defects in the workpiece;

the data acquisition system comprises a space positioning signal acquisition unit and an ultrasonic imaging detection signal receiving sensor, wherein the space positioning signal acquisition unit is connected with a receiving circuit;

the spatial information reconstruction unit comprises a positioning source reconstruction unit and a sensor spatial information reconstruction unit, the positioning source reconstruction unit is in communication connection with the ultrasonic scanning probe, and the sensor spatial information reconstruction unit transmits a signal to the ultrasonic receiving sensor;

the phased array data processing unit processes and analyzes ultrasonic signals in the workpiece obtained by the ultrasonic imaging detection signal receiving sensor, and the space imaging unit maps and converts the original ultrasonic data of the space information position obtained by the space information reconstruction unit and the phased array data processing unit into three-dimensional data.

2. The spatial free scan imaging system for phased array ultrasound inspection according to claim 1, wherein the spatially positioned source emits a circumferential or semi-circumferential ultrasonic signal into space with a constant low frequency signal.

3. The spatial free scan imaging system for phased array ultrasound inspection according to claim 1, wherein the ultrasound imaging inspection unit employs high frequency signals.

4. The spatial free-scan imaging system for phased array ultrasound inspection according to claim 1, wherein the spatial positioning signal acquisition unit comprises more than three ultrasound signal receiving sensors, the ultrasound signal receiving sensors are connected with a receiving circuit, and the ultrasound signal receiving sensors are arranged at positions which are not linearly distributed in space.

5. The spatial free-scan imaging system for phased array ultrasound inspection according to claim 1, wherein the spatial information reconstruction unit further comprises an ambient temperature sensor, by which the speed of sound is calibrated.

6. The spatial free scan imaging system for phased array ultrasound inspection according to claim 1, wherein the positioning signal acquisition unit is arranged at an edge break point of a workpiece to be inspected.

7. The space free scanning imaging method for phased array ultrasonic detection is characterized by comprising the following steps of:

step 1) after the detection complexity of a detected workpiece is determined, starting a data acquisition system and selecting a data matching mode;

step 2) selecting a wireless transmission mode, and judging whether the detected workpiece is a regular plane or a complex curved surface;

step 3), the dual-frequency signal transmitting unit moves along the surface of the detected workpiece;

step 4) starting a space positioning source, selecting a reference point as an original point, taking a plurality of points to establish contour information, and calibrating the position of the positioning source;

step 5) starting a phased array ultrasonic detection probe of the ultrasonic imaging detection unit for scanning;

step 6) a sensor space information reconstruction unit records the time of the ultrasonic signal receiving sensor receiving signals, and a positioning source reconstruction unit acquires coordinates of each point in the step 4;

and 7) simultaneously operating the positioning source reconstruction unit and the phased array data processing unit, transmitting the processed data to the space imaging unit, and performing signal optimization on the transmitted data by the phased array data processing unit.

8. The spatial free-scanning imaging method for phased array ultrasonic testing according to claim 7, wherein if the tested object is a regular plane, the number of ultrasonic signal receiving sensors is four, the ultrasonic signal receiving sensors are arranged at the end points of the profile, the spatial positioning source is placed at the calibration zero point, the length direction is taken as the X axis, the width is taken as the Y axis, and profile information is established by using the point No. 1 (0, 0), the point No. 2 (0, n), the point No. 3 (m, 0) and the point No. 4 (m, n), so as to realize automatic capture of the position of the ultrasonic signal receiving sensors.

9. The spatial free-scan imaging method for phased-array ultrasound inspection according to claim 7, wherein if the inspected object is an irregular surface, the number of ultrasound signal receiving sensors is three, the sensors are arranged in positions that are not collinear, three points having a length L are taken in three directions, the reference point is taken as an origin, coordinates of the three points are a (L, 0, 0), b (0, L, 0), c (0, 0, L), respectively, and this information is input to the localization source reconstruction unit.

10. The spatial free-scan imaging method for phased array ultrasound inspection according to claim 9, wherein the spatial imaging unit performs difference fitting on the spatial position (X, Y, Z) data obtained by the positioning source tracking unit and the phased array data processing unit, and performs noise reduction optimization on the raw ultrasound data.

Technical Field

The invention relates to the field of phased array ultrasound, in particular to a space free scanning imaging system and method for phased array ultrasound detection.

Background

Phased array ultrasound is mainly used in a detection mode of contact type data acquisition when being applied on site. When the probe scans and detects through the coupling medium, the defects need to be positioned, and therefore position coding recording needs to be carried out on a scanning path. Currently, there are more common stay wire and magnetic roller encoders. The former cannot be closely matched with a probe during encoding and has larger measurement error on the radian information; in the latter, a larger and more complex auxiliary tool and a necessary roller sensor are needed to realize coding during coding. The universal existence of coding device carries the difficulty, the assembly and disassembly is complicated, the maintenance is loaded down with trivial details scheduling problem, and in on-the-spot actual detection, often appear a large amount of dust or iron fillings glue and make it promote the difficulty on the coding device gyro wheel surface, lead to the gyro wheel to skid, and the coding error is very big, leads to indirectly that the detection cycle is prolonged, influences the overall efficiency of shipbuilding.

Disclosure of Invention

The invention aims to provide a space free scanning imaging system and method for phased array ultrasonic detection.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the space free scanning imaging system for phased array ultrasonic detection is characterized by comprising a dual-frequency signal transmitting unit, a data acquisition system, a space information reconstruction unit, a phased array data processing unit and a space imaging unit;

the dual-frequency signal transmitting unit comprises a space positioning source and an ultrasonic imaging detection transmitting source, wherein the space positioning source comprises more than one ultrasonic transducer, and the ultrasonic transducer transmits circumferential or semi-circumferential ultrasonic signals into space at constant frequency;

the ultrasonic imaging detection unit comprises a phased array ultrasonic detection probe, and the phased array ultrasonic detection probe is continuously excited to form ultrasonic waves for detecting defects in the workpiece;

the data acquisition system comprises a space positioning signal acquisition unit and an ultrasonic imaging detection signal receiving sensor, wherein the space positioning signal acquisition unit is connected with a receiving circuit;

the spatial information reconstruction unit comprises a positioning source reconstruction unit and a sensor spatial information reconstruction unit, the positioning source reconstruction unit is in communication connection with the ultrasonic scanning probe, and the sensor spatial information reconstruction unit transmits a signal to the ultrasonic receiving sensor;

the phased array data processing unit processes and analyzes ultrasonic signals in the workpiece obtained by the ultrasonic imaging detection signal receiving sensor, and the space imaging unit maps and converts the original ultrasonic data of the space information position obtained by the space information reconstruction unit and the phased array data processing unit into three-dimensional data.

Further, the spatially positioned source emits a circumferential or semi-circumferential ultrasonic signal into space with a constant low frequency signal.

Further, the ultrasonic imaging detection unit employs a high frequency signal.

Furthermore, the space positioning signal acquisition unit comprises more than three ultrasonic signal receiving sensors, the ultrasonic signal receiving sensors are connected with the receiving circuit, and the ultrasonic signal receiving sensors are arranged at positions which are not linearly distributed in the space.

Further, the spatial information reconstruction unit further comprises an ambient temperature sensor, and the sound speed is calibrated through the ambient temperature sensor.

Further, the positioning signal acquisition unit is arranged at an edge break point of the workpiece to be detected.

The space free scanning imaging method for phased array ultrasonic detection is characterized by comprising the following steps of:

step 1) after the detection complexity of a detected workpiece is determined, starting a data acquisition system and selecting a data matching mode;

step 2) selecting a wireless transmission mode, and judging whether the detected workpiece is a regular plane or a complex curved surface;

step 3), the dual-frequency signal transmitting unit moves along the surface of the detected workpiece;

step 4) starting a space positioning source, selecting a reference point as an original point, taking a plurality of points to establish contour information, and calibrating the position of the positioning source;

step 5) starting a phased array ultrasonic detection probe of the ultrasonic imaging detection unit for scanning;

step 6) a sensor space information reconstruction unit records the time of the ultrasonic signal receiving sensor receiving signals, and a positioning source reconstruction unit acquires coordinates of each point in the step 4;

and 7) simultaneously operating the positioning source reconstruction unit and the phased array data processing unit, transmitting the processed data to the space imaging unit, and performing signal optimization on the transmitted data by the phased array data processing unit.

Further, if the detected object is a regular plane, the number of the ultrasonic signal receiving sensors is four, the ultrasonic signal receiving sensors are arranged at the end points of the outline, the space positioning source is arranged at the calibration zero point, the length direction is taken as the X axis, the width is taken as the Y axis, and outline information is established by using the point No. 1 (0, 0), the point No. 2 (0, n), the point No. 3 (m, 0) and the point No. 4 (m, n), so that the position of the ultrasonic signal receiving sensor is automatically captured.

Further, if the detected object is an irregular surface, the number of the ultrasonic signal receiving sensors is three, the ultrasonic signal receiving sensors are arranged at positions which are not collinear, three points with the length of L are taken in three directions, the reference point is taken as an origin, coordinates of the three points are respectively a (L, 0, 0), b (0, L, 0), and c (0, 0, L), and the information is input to the positioning source reconstruction unit.

Further, the spatial imaging unit performs difference fitting on spatial position (X, Y, Z) data obtained by the positioning source tracking unit and the phased array data processing unit, and performs noise reduction optimization on the original ultrasonic data. .

In summary, the invention breaks through the use range that the traditional phased array data acquisition terminal is only used for structural data acquisition, solves the practical problems of complex coding, large error and the like when the portable phased array ultrasonic detection system is used, and realizes the automatic acquisition of the position of the beacon node and the tracking of the data acquisition terminal.

Drawings

FIG. 1 is a system flow diagram of the present invention;

FIG. 2 is a schematic diagram of the free space scanning imaging system of the present invention;

FIG. 3 is a system diagram of the present invention applied to a rule plane;

FIG. 4 is a system diagram of the present invention applied to an irregular cylindrical surface.

Reference numerals:

1 a double-frequency signal transmitting unit, 2 a data acquisition system, 3 a spatial information reconstruction unit,

4 phased array data processing units, 5 space imaging units,

11 space positioning source, 12 ultrasonic imaging detection unit, 21 space positioning signal acquisition unit,

22 ultrasonic imaging detection signal receiving sensor, 31 positioning source reconstruction unit,

32 sensor space information reconstruction unit and 33 environment temperature sensor.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention discloses a space free scanning imaging system for phased array ultrasonic detection, which comprises a dual-frequency signal transmitting unit 1, a data acquisition system 2, a space information reconstruction unit 3, a phased array data processing unit 4 and a space imaging unit 5.

The dual-frequency signal transmitting unit 1 comprises a spatial positioning source 11 and an ultrasonic imaging detection transmitting source, wherein the spatial positioning source 11 comprises more than one ultrasonic transducer, and the ultrasonic transducer transmits circumferential or semi-circumferential ultrasonic signals into space at a constant frequency.

The ultrasonic imaging detection unit 12 includes a phased array ultrasonic detection probe, and the phased array ultrasonic detection probe is continuously excited to form ultrasonic waves for detecting defects inside the workpiece.

The data acquisition system 2 comprises a space positioning signal acquisition unit 21 and an ultrasonic imaging detection signal receiving sensor 22, wherein the space positioning signal acquisition unit 21 is connected with a receiving circuit.

The spatial information reconstruction unit 3 comprises a positioning source reconstruction unit 31 and a sensor spatial information reconstruction unit 32, the positioning source reconstruction unit 31 is in communication connection with the ultrasonic scanning probe, and the sensor spatial information reconstruction unit 32 transmits a signal to the ultrasonic receiving sensor.

The phased array data processing unit 4 processes and analyzes the ultrasonic signals in the workpiece obtained by the ultrasonic imaging detection signal receiving sensor 22, and the space imaging unit 5 maps the original ultrasonic data of the space information position obtained by the space information reconstruction unit 3 and the phased array data processing unit 4 and converts the data into three-dimensional data.

Example 1

And after the detection complexity of the detected workpiece is determined, starting the data acquisition system 2 and selecting a data matching mode.

In order to avoid signal interference with the ultrasonic signal receiving sensor and to stabilize and transmit big data, the ultrasonic imaging detection unit 12 and the dual-frequency signal transmitting unit 1 formed by the spatial positioning source 11 are connected by wire.

In order to prevent other signals from interfering with the ultrasonic signal receiving sensor and ensure the independence of the operation of the module, only the f1 frequency signal can be received.

If the detected object is a regular plane, as shown in fig. 3, in order to improve the quality of imaging and reduce the complexity of the system, the ultrasonic signal receiving sensor may be disposed at an end point of the contour, the reconstruction of the imaging data may be reduced to an (x, y) plane, and the reconstruction of the imaging data is limited within the range of the contour, thereby improving the accuracy of the reconstruction of the imaging data.

And setting the detected object as an mxn regular flat rectangular surface, and selecting a simple matching mode. The number of the ultrasonic signal receiving sensors is 4, the ultrasonic signal receiving sensors are arranged at the end points of the outline, the space positioning source 11 is placed at a typical position to be regarded as a calibration zero point, and the position of the No. 1 ultrasonic signal receiving sensor is taken in the implementation.

Starting the spatial positioning source 11, starting timing by the sensor spatial information reconstruction unit 32, transmitting continuous circumferential or semi-circumferential ultrasonic signals to the space by the spatial positioning source 11 at a constant frequency f1(40kMz), recording the time from the start of timing to the time of receiving the signals by the sensor spatial information reconstruction unit 32 for 4 ultrasonic signal receiving sensors respectively at t1, t2, t3 and t4, matching with the ultrasonic propagation sound velocity v to obtain corresponding distances, taking the length direction as an X axis and the width as a Y axis, establishing profile information by using a point 1 (0, 0), a point 2 (0, n), a point 3 (m, 0) and a point 4 (m, n), and realizing automatic capture of the position of the ultrasonic signal receiving sensors.

The phased array ultrasonic detection probe of the ultrasonic imaging detection unit 12 is started to scan, the frequency used by the phased array ultrasonic detection probe is usually a high-frequency signal, the phased array ultrasonic detection probe is excited at a fixed frequency f2 (2.25 HMz), the signal enters the inside of a workpiece through coupling to form ultrasonic waves for detecting defects in the workpiece, the dual-frequency signal transmitting unit 1 formed by the ultrasonic imaging detection unit 12 and the spatial positioning source 11 moves along the surface of the detected workpiece, and the movement track can be a regular track or a free track.

The tracking unit of the space positioning source 11 and the phased array data processing unit 4 work simultaneously at the moment, the processing data are transmitted to the space imaging unit 5 simultaneously, the unit only needs to be simply optimized, the position data can be linked without depth fitting, and real-time imaging is achieved.

Example 2

If the object to be examined is an irregular surface, as shown in fig. 4, the object to be examined is a large-diameter D-cylindrical curved surface, and the volume reconstruction mode is selected.

The number of the ultrasonic signal receiving sensors is three, the ultrasonic signal receiving sensors are arranged at proper positions in space in a non-collinear manner, the ultrasonic signal receiving sensors are prevented from being shielded or are positioned in a signal receiving blind area, and the ultrasonic signal receiving sensors are supported to a certain height h by a tripod in the implementation.

And selecting a reference point, respectively transmitting signals to the ultrasonic receiving sensors Ri at least once in each direction at known distances in three orthogonal directions of the space positioning source 11 at the reference point, performing information comprehensive autocorrelation calculation, and automatically capturing the positions of the ultrasonic signal receiving sensors. In this embodiment, three points with a length of L are taken in three directions, a reference point is taken as an origin point, coordinates of the three points are a (L, 0, 0), b (0, L, 0), and c (0, 0, L), respectively, and this information is input to the positioning source reconstruction unit 31, where orthogonal calibration can be completed with the aid of a designed mechanical support.

The method comprises the steps that a spatial positioning source 11 is sequentially arranged at three points a, b and c to be started, a sensor spatial information reconstruction unit 32 starts timing, the time for three ultrasonic signal receiving sensors to receive signals from the beginning of timing is respectively T1, T2 and T3, the three ultrasonic signal receiving sensors are respectively recorded by the sensor spatial information reconstruction unit 32 and are matched with ultrasonic propagation sound velocity, corresponding distances can be obtained, furthermore, the sensor spatial information reconstruction unit 32 comprehensively matches the data of the spatial positioning source 11 at the three points a, b and c of a receiver, namely, the time information ti (i is more than or equal to 3) based on multiple points and the ultrasonic propagation sound velocity c0 are met, three-dimensional reconstruction is carried out on the receiving points, namely the positions of the ultrasonic signal receiving sensors, and calibration and capture of the positions of the ultrasonic signal receiving sensors are achieved.

The ultrasonic imaging detection unit 12 is started to scan the phased array ultrasonic detection probe, the frequency used by the phased array ultrasonic detection probe is usually a high-frequency signal, and the phased array ultrasonic detection probe is excited at a fixed frequency f2 (2.25 HMz), so that ultrasonic waves for detecting defects in the workpiece are formed. The ultrasonic imaging detection unit 12 and the spatial positioning source 11 jointly form a dual-frequency signal transmitting unit 1 which moves along the surface of the workpiece to be detected, and the movement track can be a regular track or a free track.

At this time, the tracking unit and the phased array data processing unit 4 built in the spatial positioning source 11 work simultaneously, the processed data are transmitted to the spatial imaging unit 5 simultaneously, the spatial imaging unit 5 performs difference fitting on spatial position (X, Y, Z) data obtained by the two units, noise reduction optimization is performed on the original ultrasonic data, the data are corrected through parameters from the ambient temperature sensor 33, the data are mapped and converted into three-dimensional data, and reconstruction and visual display of internal quality information of the detected workpiece are achieved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.