CN111157457A - Ultrafast photoacoustic imaging nondestructive detection system and method - Google Patents
Ultrafast photoacoustic imaging nondestructive detection system and method Download PDFInfo
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- CN111157457A CN111157457A CN202010038790.8A CN202010038790A CN111157457A CN 111157457 A CN111157457 A CN 111157457A CN 202010038790 A CN202010038790 A CN 202010038790A CN 111157457 A CN111157457 A CN 111157457A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
Abstract
The invention discloses an ultrafast photoacoustic imaging nondestructive detection system and method, which comprises a laser, a laser beam expanding device, a photoacoustic excitation and sensing integrated device, a peak detection device, a memory area array, a reading shift register and a background image processing device, wherein the laser beam expanding device is connected with the laser beam expanding device; the laser is positioned above the laser beam expanding device, and the laser beam expanding device is positioned above the photoacoustic excitation and sensing integrated device; the peak value of the received electric signal is extracted through the peak value detection device, the data acquisition and processing speed is greatly improved, the photoacoustic excitation and sensing integrated device can realize the integration of laser area array excitation and ultrasonic signal area array receiving on the same side, mechanical scanning is not needed, the problem that the imaging speed is low due to the fact that the received data is huge and the data processing is complex in the traditional ultrasonic imaging is solved, the detection object can be rapidly imaged at one time within the range of the photoacoustic excitation and sensing integrated device, and the method has guiding significance in practical application.
Description
Technical Field
The invention relates to the technical field of ultrasonic detection, in particular to an ultrafast photoacoustic imaging nondestructive detection system and method.
Background
At present, ultrasonic imaging detection is widely applied to industrial nondestructive detection due to the characteristics of non-invasiveness, strong penetrating power, high defect sensitivity and the like. However, in the conventional ultrasonic scanning imaging, a single probe or a linear array probe is generally adopted to scan and image a section of a detection area through a mechanical scanning device, and the method is time-consuming and expensive, so that the imaging speed is greatly limited. The problem that the traditional mechanical scanning imaging speed is low is solved preliminarily by adopting a phased array probe through an electronic scanning imaging mode, but the imaging resolution ratio of the phased array probe is limited by the size of an array element of the phased array probe, and the imaging speed of the phased array electronic scanning imaging cannot meet the requirement of the high-speed imaging occasion due to the large received data volume and the complex data processing.
The laser area array focusing excitation ultrasound is realized by combining laser with a micro lens array to replace the traditional phased array probe, so that the imaging speed and the imaging resolution can be improved to a certain extent, but the transmitting end and the receiving end of the existing laser ultrasonic detection system using the micro lens array are separated by adopting a transmission method, the laser-excited ultrasonic signals are generally received by adopting an annular transducer array surrounding a detected object or an energy converter area array positioned at the bottom of the detected object, the ultrasonic detection system cannot be adopted in some practical application occasions where the transmission detection cannot be realized, and simultaneously, because the received data is huge and the data processing is complex, the high-speed imaging cannot be realized, and the practical application of the ultrasonic detection system is limited.
In summary, in the ultrasound imaging technology in the prior art, there is a technical problem that high-speed imaging cannot be realized in the situation where the received data is huge and the data processing is complex.
Disclosure of Invention
The invention provides an ultrafast photoacoustic imaging nondestructive testing system and method, which are used for solving the technical problem that high-speed imaging cannot be realized in the prior art in the occasions with huge received data and complex data processing.
The invention provides an ultrafast photoacoustic imaging nondestructive detection system which comprises a laser, a laser beam expanding device, a photoacoustic excitation and sensing integrated device, a peak detection device, a memory area array, a reading shift register and a background image processing device, wherein the laser beam expanding device is connected with the laser beam expanding device; the laser is positioned above the laser beam expanding device, and the laser beam expanding device is positioned above the photoacoustic excitation and sensing integrated device;
the output end of the photoacoustic excitation and sensing integrated device is connected with the input end of the peak value detection device, the output end of the peak value detection device is connected with the input end of the memory area array, the output end of the memory area array is connected with the input end of the shift register, and the output end of the shift register is connected with the input end of the background image processing device.
Preferably, the photoacoustic excitation and sensing integrated device comprises a microlens area array, an energy converter area array, a mask plate and a base, wherein the base, the mask plate, the energy converter area array and the microlens area array are sequentially installed from top to bottom, the energy converter area array comprises a plurality of energy converter elements, and the output end of each energy converter element is respectively connected with the input end of the peak detection device.
Preferably, the output end of each transducer element is connected with the input end of the peak detection device in a full sampling array mode.
Preferably, the micro-lens area array is embedded in the base, the transducer area array is distributed on the lower surface of the base and is dispersed in array element gaps of the micro-lens area array, the base is embedded in the mask plate, and through holes are formed in the mask plate.
Preferably, the bottom of the microlens array is provided with a coupling agent, and the coupling agent is made of a highly transparent material.
Preferably, the peak detection means is a discrete diode capacitance type peak detection circuit.
Preferably, the diode capacitance type peak detection circuit is controlled by a time gate.
Preferably, the laser emitted by the laser is a pulse laser.
Preferably, the system further comprises a display device, and an input end of the display device is connected with an output end of the background image processing device.
An ultrafast photoacoustic imaging nondestructive testing method based on the ultrafast photoacoustic imaging nondestructive testing system comprises the following steps:
placing an object to be detected below the coupling agent;
controlling a laser to emit pulse laser, irradiating the pulse laser to a micro-lens area array of the photoacoustic excitation and sensing integrated device to excite laser ultrasound after the pulse laser passes through a laser beam expanding device, and forming a laser focus area array on the surface of an object to be detected after the laser ultrasound penetrates through a coupling agent to excite photoacoustic signals;
receiving photoacoustic signals reflected from an object to be detected by transducer array elements in a transducer area array in the photoacoustic excitation and sensing integrated device, converting the photoacoustic signals into electric signals, and transmitting the electric signals to a peak value detection device;
the peak value detection device extracts the peak value in the electric signal to obtain a peak value signal, and outputs the peak value signal to a memory area array for storage;
the shift register serially outputs the peak signals in the memory area array bit by bit to the background image processing device;
the background image processing device analyzes and calculates the peak signal to obtain a two-dimensional photoacoustic image of the detected object;
and transmitting the two-dimensional photoacoustic image of the detected object to a display device for displaying.
According to the technical scheme, the embodiment of the invention has the following advantages:
the embodiment of the invention extracts the peak value of the received electric signal through the peak value detection device, greatly improves the data acquisition and processing rate, can realize the integration of laser area array excitation and ultrasonic signal area array receiving at the same side by the photoacoustic excitation and sensing integrated device, does not need mechanical scanning, solves the problem of low imaging speed caused by huge received data and complex data processing of the traditional ultrasonic imaging, ensures that a detection object can be rapidly imaged at one time in the range of the photoacoustic excitation and sensing integrated device, and has guiding significance in practical application.
The embodiment of the invention also has the following advantages:
the embodiment of the invention realizes the integration of laser excitation and receiving through the photoacoustic excitation and sensing integrated device formed by combining the micro-lens area array and the transducer area array, so that the excitation end and the receiving end of the laser detection technology do not need to be separated, the device is suitable for various occasions, and the integrated structure is very easy to realize industrial large-area batch production; and laser focus area arrays are generated on the surface of an object to be detected so as to excite laser ultrasound, the frequency band of the ultrasound excited by the laser focus area arrays is wider, the spatial resolution is higher, the imaging resolution is greatly improved, and meanwhile, the imaging resolution can be adjusted by adjusting the density of the micro-lens area arrays in the photoacoustic excitation and sensing integrated device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic system structure diagram of an ultrafast photoacoustic imaging nondestructive testing system provided by an embodiment of the present invention;
fig. 2 is a side view of an integrated photoacoustic excitation and sensing apparatus of an ultrafast photoacoustic imaging nondestructive testing system according to an embodiment of the present invention.
Fig. 3 is a bottom view of an integrated photoacoustic excitation and sensing apparatus of an ultrafast photoacoustic imaging nondestructive testing system according to an embodiment of the present invention.
Fig. 4 is an exploded view of a photoacoustic excitation and sensing integrated device of an ultrafast photoacoustic imaging nondestructive testing system according to an embodiment of the present invention.
Fig. 5 is a flowchart of a method of an ultrafast photoacoustic imaging nondestructive testing method according to an embodiment of the present invention.
Wherein the reference numerals have the following meanings:
1. a laser; 2. a laser beam expanding device; 3. a photoacoustic excitation and sensing integrated device; 4. a coupling agent; 5. an object to be tested; 6. a peak value detection means; 7. a memory area array; 8. a shift register; 9. a background image processing device; 10. a display device; 11. a mask plate; 12. a base; 13. a microlens area array; 14. an array of transducers.
Detailed Description
The embodiment of the invention provides an ultrafast photoacoustic imaging nondestructive testing system and method, which are used for solving the technical problem that high-speed imaging cannot be realized in the prior art in the occasions with huge received data and complex data processing.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a system of an ultrafast photoacoustic imaging nondestructive testing system according to an embodiment of the present invention;
the invention provides an ultrafast photoacoustic imaging nondestructive detection system which comprises a laser 1, a laser beam expanding device 2, a photoacoustic excitation and sensing integrated device 3, a peak value detection device 6, a memory area array 7, a reading shift register 8 and a background image processing device 9, wherein the laser beam expanding device is connected with the laser beam expanding device through a transmission line; the laser 1 is positioned above the laser beam expanding device 2, and the laser beam expanding device 2 is positioned above the photoacoustic excitation and sensing integrated device 3; the laser beam expanding device 2 can enlarge the size of the laser beam emitted by the laser 1, and the laser can cover the whole area of the photoacoustic excitation and sensing integrated device 3 after passing through the laser beam expanding device 2.
The output end of the photoacoustic excitation and sensing integrated device 3 is connected with the input end of a peak value detection device 6, the output end of the peak value detection device 6 is connected with the input end of a memory area array 7, the output end of the memory area array 7 is connected with the input end of a shift register 8, and the output end of the shift register 8 is connected with the input end of a background image processing device 9.
The shift register 8 is used for serially outputting information in the memory area array 7 to the background image processing device 9 bit by bit, outputting data of the peak detection device 6 to the storage shift register 8 in the memory area array 7, and outputting the data stored in the memory area array 7 downwards row by row to the background image processing device 9 for processing by reading the shift register 8 by the memory area array 7.
The background image processing device 9 adopts a GPU, which is also called a display core, a visual processor or a display chip, and is a microprocessor dedicated to image operation work on personal computers, workstations, game machines and some mobile devices (such as tablet computers, smart phones and the like), and is used for undertaking the task of outputting display images;
as a preferred embodiment, the photoacoustic excitation and sensing integrated device 3 includes a microlens area array 13, a transducer area array 14, a mask plate 11 and a base 12, the mask plate 11, the transducer area array 14 and the microlens area array 13 are sequentially installed from top to bottom, the transducer area array 14 includes a plurality of transducer elements, an output end of each transducer element is respectively connected with an input end of the peak detection device 6, and the peak detection device 6 is used for maintaining a signal peak value received by each transducer element.
The micro lens area array 13 is used for focusing excitation to generate laser ultrasound, and the size, the arrangement mode and the density of the array elements of the micro lens area array 13 can be optimally designed according to requirements.
The transducer area array 14 is used for receiving ultrasonic signals reflected by the object 5 to be measured, the size, the arrangement mode and the density of array elements of the transducer area array 14 can be optimally designed according to needs, and the transducer area array 14 is industrially manufactured in a large area by methods such as 3D printing or MEMS technology.
As a preferred embodiment, the output end of each transducer array element is connected to the input end of the peak detection device 6 in a full sampling array connection, and the full sampling array connection has the characteristics of high transmission speed and high safety, so as to improve the sampling speed.
As shown in fig. 2, 3 and 4, as a preferred embodiment, the microlens area array 13 is embedded in the base 12, the transducer area array 14 is distributed on the lower surface of the base 12 and is dispersed in the array element gap of the microlens area array 13, the base 12 is embedded in the mask plate 11, the mask plate 11 is provided with a through hole, and the size of the through hole of the mask plate 11 is required to enable the laser to completely cover the range of the microlens area array 13 in the photoacoustic excitation and sensing integrated device 3.
In a preferred embodiment, the bottom of the microlens array 13 is provided with the coupling agent 4, the material of the coupling agent 4 is highly transparent, and the accuracy of sampling is improved by providing the coupling agent 4.
As a preferred embodiment, the peak detection means 6 is a discrete diode capacitance type peak detection circuit.
As a preferred embodiment, the diode capacitance type peak detection circuit is controlled by a time gate, and is used for keeping a signal peak value received by each transducer array element; the output signal of the peak detection circuit will remain at the maximum of the input signal until a new maximum occurs or the circuit is reset and the next peak acquisition cycle will not be performed.
As a preferred embodiment, the laser emitted by the laser 1 is a pulse laser, parameters such as pulse width, wavelength, energy and the like of the laser can be adjusted according to different objects to be measured 5, and the type of the laser 1 is a solid or gas laser 1 as required;
as a preferred embodiment, the system further includes a display device 10, an input end of the display device 10 is connected with an output end of the background image processing device 9, and the staff visually observes the ultrasonic image of the object 5 to be measured through the display device 10.
As shown in fig. 5, an ultrafast photoacoustic imaging nondestructive testing method based on the ultrafast photoacoustic imaging nondestructive testing system includes the following steps:
placing an object 5 to be detected below the highly transparent couplant 4;
controlling a laser 1 to emit pulse laser, and expanding the pulse laser through a laser beam expanding device 2 to enable the size of the laser beam to completely cover the through hole of the mask plate 11; irradiating laser to the photoacoustic excitation and sensing integrated device 3, forming a laser focus area array on the surface of the object 5 to be detected after passing through the micro-lens area array 13 and the coupling agent 4, and exciting a photoacoustic signal according to a thermoelastic effect or an ablation effect;
it should be noted that the arrangement mode of the microlens array 13 can be divided into a one-dimensional linear array, a two-dimensional area array, an annular area array, and the like, and the size of the array elements, the density of the array elements, and the array range of the microlens array 13 can be optimally designed to meet the detection requirements and the detection ranges of different detected objects, so that the adjustable imaging resolution and the adjustable imaging range are realized. Meanwhile, the size of the through hole of the mask plate 11 needs to be capable of enabling the laser to completely cover the range of the micro lens area array 13 in the photoacoustic excitation and sensing integrated device 3.
Each transducer array element in the transducer array 14 in the photoacoustic excitation and sensing integrated device 3 receives photoacoustic signals reflected from the object 5 to be detected, converts the photoacoustic signals into electrical signals, and transmits the electrical signals to the peak value detection device 6;
it should be noted that the transducer array elements of the transducer array 14 in the photoacoustic excitation and sensing integrated apparatus 3 may be arranged in a one-dimensional linear array, a two-dimensional planar array, an annular planar array, or the like, or may be arranged in a proper and excellent-performance arrangement manner in combination with the microlens array to meet the requirements of the detection structures and the detection ranges of different detected objects.
The peak value detection device 6 extracts the peak value in the electric signal to obtain a peak value signal, and outputs the peak value signal to the memory area array 7 for storage;
it should be noted that, because the peak detection device 6 only extracts the peak value of the received signal, the data acquisition processing rate is greatly improved, and the problem of low imaging speed caused by huge received data and complex data processing in the conventional ultrasonic imaging is solved.
The shift register 8 serially outputs the peak signals in the memory area array bit by bit to the background image processing device 9;
when the memory area array 7 stores data, the data in the memory area array 7 is serially output to the background image processing device 9 bit by bit through the readout shift register 8 for processing, that is, the output of the storage shift register 8 in the bottom row of the memory area array 7 is output each time, and then the data stored in the rest rows as registers is transmitted downward row by row.
The background image processing device 9 analyzes and calculates the peak signal to obtain a two-dimensional photoacoustic image of the detected object;
the two-dimensional photoacoustic image of the detected object is transmitted to the display device 10 to be displayed, and whether the detected object has defects or not is judged according to the two-dimensional photoacoustic image.
For different detected objects, before ultrasonic detection is started, parameters such as wavelength, pulse width and energy of pulse laser can be adjusted according to the type and size of the detected objects and imaging requirements, or the range size, array element density or array element arrangement mode of the micro-lens area array 13 and the transducer area array 14 in the photoacoustic excitation and sensing integrated device 3 and the ultrasonic receiving frequency of the corresponding transducer are adjusted to meet different detection requirements.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An ultrafast photoacoustic imaging nondestructive detection system is characterized by comprising a laser, a laser beam expanding device, a photoacoustic excitation and sensing integrated device, a peak detection device, a memory area array, a reading shift register and a background image processing device; the laser is positioned above the laser beam expanding device, and the laser beam expanding device is positioned above the photoacoustic excitation and sensing integrated device;
the output end of the photoacoustic excitation and sensing integrated device is connected with the input end of the peak value detection device, the output end of the peak value detection device is connected with the input end of the memory area array, the output end of the memory area array is connected with the input end of the shift register, and the output end of the shift register is connected with the input end of the background image processing device.
2. The ultrafast photoacoustic imaging nondestructive testing system according to claim 1, wherein the photoacoustic excitation and sensing integrated device comprises a microlens area array, an energy converter area array, a mask plate and a base, and the base, the mask plate, the energy converter area array and the microlens area array are sequentially installed from top to bottom;
the transducer area array comprises a plurality of transducer array elements, and the output end of each transducer array element is respectively connected with the input end of the peak detection device.
3. The ultrafast photoacoustic imaging nondestructive testing system of claim 2, wherein the output of each transducer element is connected to the input of the peak detection means in a full sampling array.
4. The ultrafast photoacoustic imaging nondestructive testing system according to claim 3, wherein the microlens array is embedded in the base, the transducer arrays are distributed on the lower surface of the base and dispersed in the array element gaps of the microlens array, the base is embedded in the mask plate, and through holes are formed in the mask plate.
5. The ultrafast photoacoustic imaging nondestructive testing system of claim 4, wherein the bottom of the microlens array is provided with a coupling agent, and the coupling agent is made of a highly transparent material.
6. The ultrafast photoacoustic imaging nondestructive inspection system of claim 1 wherein the peak detection means is a discrete diode capacitance type peak detection circuit.
7. The ultrafast photoacoustic imaging nondestructive inspection system of claim 6, wherein the diode capacitor type peak detection circuit is controlled with a time gate.
8. The ultrafast photoacoustic imaging nondestructive inspection system of claim 1, wherein the laser emitted from the laser is a pulsed laser.
9. The ultrafast photoacoustic imaging nondestructive inspection system of claim 1, wherein the system further comprises a display device, and an input end of the display device is connected to an output end of the background image processing device.
10. An ultrafast photoacoustic imaging nondestructive testing method based on the ultrafast photoacoustic imaging nondestructive testing system of any one of the above claims 1 to 9, comprising the steps of:
placing an object to be detected below the coupling agent;
controlling a laser to emit pulse laser, irradiating the pulse laser to a micro-lens area array of the photoacoustic excitation and sensing integrated device after the pulse laser passes through a laser beam expanding device to excite laser ultrasound, and forming a laser focus area array on the surface of an object to be detected after the laser ultrasound penetrates through a coupling agent to excite photoacoustic signals;
receiving photoacoustic signals reflected from an object to be detected by transducer array elements in a transducer area array in the photoacoustic excitation and sensing integrated device, converting the photoacoustic signals into electric signals, and transmitting the electric signals to a peak value detection device;
the peak value detection device extracts the peak value in the electric signal to obtain a peak value signal, and outputs the peak value signal to a memory area array for storage;
the shift register serially outputs the peak signals in the memory area array bit by bit to the background image processing device;
the background image processing device analyzes and calculates the peak signal to obtain a two-dimensional photoacoustic image of the detected object;
and transmitting the two-dimensional photoacoustic image of the detected object to a display device for displaying.
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| JPH11119174A (en) * | 1997-10-14 | 1999-04-30 | Agency Of Ind Science & Technol | Optical element and its production |
| JP2012173136A (en) * | 2011-02-22 | 2012-09-10 | Fujifilm Corp | Optoacoustic imaging device, probe unit used therefor, and operation method of optoacoustic imaging device |
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Application publication date: 20200515 |