CN101011243A - Foreign body detecting method using thermoacoustic imaging and device thereof - Google Patents
Foreign body detecting method using thermoacoustic imaging and device thereof Download PDFInfo
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- CN101011243A CN101011243A CN 200710026646 CN200710026646A CN101011243A CN 101011243 A CN101011243 A CN 101011243A CN 200710026646 CN200710026646 CN 200710026646 CN 200710026646 A CN200710026646 A CN 200710026646A CN 101011243 A CN101011243 A CN 101011243A
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Abstract
The invention relates to a method for using thermal sound image to detect foreign material and relative device. Said device is formed by a microwave generator, a rotational scanning element, a sound signal collector, a computer, a sample fixer, and a sound coupler, while the microwave generator, sound signal collector, and the computer are electrically connected; the rotationally scanning element is electrically connected with the computer; the sample fixer is in the sound coupler; and the sample fixer is connected with the rotational scanning element. The invention has high positioning accuracy, high resolution and the application for supplying clear image to the foreign material detecting technique, with low cost.
Description
Technical field
The present invention relates to a kind of thermometrically and technical field of imaging, be specifically related to a kind of method and device thereof that utilizes thermal acoustic imaging to detect foreign body.
Background technology
The domestic and international at present detection method to foreign body all is to utilize X ray directly to have an X-rayed down foreign body imaging to be measured, perhaps utilize ultrasound wave to foreign body imaging to be measured, these methods and the device shortcoming that realizes these methods are that mobility is relatively poor, complicated operation, waste time and energy, and all need the film operation, resolution is relatively poor; The device price that realizes these methods in addition is also expensive.
Summary of the invention
For solving the aforementioned problems in the prior, the invention provides a kind of method of utilizing thermal acoustic imaging to detect foreign body, this method may further comprise the steps:
(1) adopt pulse microwave to incide on the object under test, the excitation object under test produces hot acoustical signal;
(2) scanning of rotation object under test or detector of sound receives hot acoustical signal, gathers hot acoustical signal data simultaneously;
(3) after the application data process software carries out date processing to the hot acoustical signal of gathering, object layer to be measured is analysed imaging, obtain the image of object under test by backprojection algorithm.
In the described step (1), the wavelength of the pulse microwave that is adopted is preferably 1mm～1m.
In the described step (2), rotation and scanning can be under the control of LabVIEW capture program, gather hot acoustical signal by motor drive detector of sound or object under test rotation.
In the described step (2), detector of sound can adopt the ultrasonic transducer of multiple linear detector array or single spy unit.
In the described step (3), described application data process software carries out date processing to the hot acoustical signal of gathering, and can be to utilize MATLAB software to the Signal Pretreatment of collection and the image reconstruction of back projection by computer.
Foreign body of the present invention is and contains the object that the microwave absorption difference is arranged between the object of foreign body.The absorptance of microwave depends mainly on the dielectric constant of material, dielectric constant as water is about 80.0, the dielectric constant of glass is about 3.5, the dielectric constant of silicon dioxide is about 4.5, the dielectric constant of biological tissue such as lean meat can reach 55, so utilize microwave absorption difference bigger between two kinds of materials, can obtain the tomographic reconstruction image of higher contrast.Method of the present invention is utilized the short pulse microwave object under test, object under test absorbs microwave energy and produces thermoelectric bulking effect, thereby be inspired the hot acoustical signal that belongs to ultrasonic wave range, rebuild the microwave absorption distribution of tissue to be measured by detecting this hot acoustical signal, because the dielectric constant difference of different material, so degree of absorption difference to microwave, utilize the difference of this absorption to make up the image of object under test, foreign body is shown on image, judge shape, size and the position etc. of foreign body according to display result.
The present invention also provides a kind of device of realizing above-mentioned detection method, and this device comprises microwave generating assembly, rotation sweep assembly, acoustical signal acquisition component, computer, sample fixation kit, acoustical coupling assembly; Microwave generating assembly, acoustical signal acquisition component, computer are electrically connected successively; Rotation sweep assembly and computer are electrically connected; The sample fixation kit places in the acoustical coupling assembly; Sample fixation kit and rotation sweep assembly are electrically connected.
Described microwave generating assembly can be made up of microwave generator and waveguide mouth.
Described rotation sweep assembly can be electrically connected and be formed by relay, motor, 3-D scanning platform.
Described acoustical signal acquisition component can be electrically connected successively by detector of sound, signal amplifier, capture card, controller and constitute; Described detector of sound is the ultrasonic transducer of multiple linear detector array or single spy unit preferably.
Acquisition controlling software and data processing software are housed in the described computer, and acquisition controlling software can be LabVIEW software, and data processing software can be a MATLAB software; Acquisition controlling software control rotation sweep and the hot acoustical signal of collection; Data processing software carries out the image reconstruction of pretreatment and back projection to the signal of gathering.
Described sample fixation kit can be made up of three-dimensional adjustable sample platform and sample fixture.
Described acoustical coupling assembly can be made up of sample cell, acoustical coupling liquid, and sample cell can be the vessel that plastics tank or other can holding liquids.
Annexation is as follows more specifically between the element in each assembly:
The sample platform places acoustical coupling liquid, and sample platform and motor are electrically connected, and motor and 3-D scanning platform are electrically connected, and motor also is electrically connected with relay, and relay is connected with computer by digital I/O card;
Detector of sound is fixed on the 3-D scanning platform by support, and detector of sound, signal amplifier, capture card are electrically connected successively, and controller is electrically connected with signal amplifier, capture card, microwave generator simultaneously; Capture card is connected with computer by USB interface.
Device work process of the present invention and principle are: with the sample fixture object under test is fixed on the sample platform, microwave generator produces pulse microwave (wavelength, pulsewidth and repetition rate can be selected as required), pulse microwave is radiated on the object under test through the waveguide mouth, the intravital foreign body of object and thing absorbs the microwave temperature and raises, intensification causes thermal expansion and produces hot acoustical signal, is coupled to detector of sound via acoustical coupling liquid; Detector of sound receives hot acoustical signal, after the signal amplifier pretreatment, again by the capture card collection after USB interface is transferred to computer handles.In the signal acquisition process, by the rotation of step motor control sample platform, motor drives the rotation of detector of sound simultaneously by the three-dimensional adjustable platform of control, and motor is controlled by relay by computer; Controller is microwave emission, the signal amplification of signal amplifier and the signals collecting of capture card of controlled microwave generator simultaneously.The rotation step-length of the anglec of rotation of object under test, motor, the time of signals collecting and signals collecting position can be selected according to the situation of object under test.
Compared with prior art, the present invention has following advantage:
(1) the inventive method is utilized the microwave absorption difference characteristic of different objects, and combine and ultrasonic body is had the advantage that high-resolution and microwave imaging have high-contrast, strong penetration capacity, with tradition be used for formation method that foreign body detects compare have deep layer, the advantage of no ray, high-resolution, high-contrast, can be for more clear reference picture be provided in the detection technique.
(2) the inventive method utilizes the multiple linear array probe as hot detector of sound, can realize the detection of quick nondestructive.
(3) method of the present invention can be selected the pulse microwave of different wave length for use, realizes the location detection of corresponding different depth, and foreign body in the object is formed omnibearing picture rich in detail, as the size of foreign body, shape, position etc.
(4) cost of each assembly of device of the present invention is lower, so the cost of single unit system is also relatively low, is easy to application.
Description of drawings
Fig. 1 is the structural representation of the device of embodiment 1.The name of each element shown in the figure is called: microwave generator 1-1, waveguide mouth 1-2, motor 2-1,3-D scanning platform 2-2, relay 2-3, detector of sound 3-1, signal amplifier 3-2, capture card 3-3, controller 3-4, computer 4, sample platform 5, sample cell 6-1, acoustical coupling liquid 6-2.
Fig. 2 is that K font black rubber is embedded in the dark cross sectional photograph of 45mm in the agar;
Fig. 3 utilizes the detected image of the device of embodiment 1 to rubber foreign body in the agar, and wherein the angle of sample rotation is 180 °, and the rotation step-length of motor is 36 °.
Fig. 4 is that a pin (metallic foreign body) is embedded in the dark cross sectional photograph of 15mm in the lean meat;
Fig. 5 utilizes the image that lean meat became of the device of embodiment 1 to the containing metal foreign body, and wherein the angle of sample rotation is 180 °, and the rotation step-length of motor is 18 °.
The specific embodiment
Fig. 1 is a preferred embodiment structure chart of the present invention, and this device is made up of microwave generating assembly, rotation sweep assembly, acoustical signal acquisition component, computer, sample fixation kit, acoustical coupling assembly.Wherein the microwave generating assembly is connected and composed by microwave generator 1-1 and waveguide mouth 1-2; By digital I/0 card and relay 2-3 control rotary sample motor 2-1 and 3-D scanning platform 2-2,3-D scanning platform 2-2 is being with detector of sound 3-1 to move to the rotation sweep assembly by computer 4; The acoustical signal acquisition component is by detector of sound 3-1 received signal, be transferred to computer 4 through signal amplifier 3-2 amplification and high-speed collection card 3-3 collection again, controller 3-4 (PLD EPM7032, U.S. altera corp) Synchronization Control microwave emission, signal amplify and gather, and wherein acoustical signal is coupled to detector of sound 3-1 by the acoustical coupling assembly.Wherein: microwave generator 1-1 selects the BW-1200HPT of China Arms Industry second 06 institute for use, but tranmitting frequency is the pulse microwave of 1.2GHz, pulsewidth be 0.5 or lus optional, the energy of microwave is that the rectangular waveguide 1-2 of 12.7mmx6.3mm is radiated on the sample uniformly by sectional area; The sample fixation kit is made up of sample platform 5 and the sample fixture that is attached on the sample platform 5, the sample platform is selected the plastic sample platform for use, be placed on the plastic sample platform by the sample of imaging, sample cell 6～1st with the cuboid container that synthetic resin is made, has been full of acoustical coupling liquid 6-2 transformer oil and has been beneficial to velocity of sound coupling in the sample cell; (SIUI, China) B ultrasonic is an experiment porch to whole system, selects for use the 3-2 of multiple linear detector array system (MLTAS) to receive hot acoustical signal also by phase-control focusing technology amplifying signal with CTS-200.Wherein, MLTAS is made up of preamplifier, multicircuit switch and phase-adjusting circuit.The emission of controller 3-4 Synchronization Control microwave, signal phase-control focusing amplify and gather; Detector of sound 3-1 is that (Hitachi Japan), forms and be divided into 64 groups that shake by 320 units of shaking to multiunit detector EZU-PL21, and per 5 units of shaking form the group that shakes.Its mid frequency is 3.5MHz, and sweep length is 102mm; Data acquisition card 3-3 selects the Compuscope12100 type high-speed data acquisition card (DAS-CARD) of Gage Applied company for use, adopts the external trigger mode, and sampling rate can reach 100MHz; Rotary components is 1.8 ° of Japanese east 2 phase step motor VEXTA step-lengths; The acquisition controlling program realizes that with LabVIEW software digital graphics signal is handled with MATLAB software and realized; Computer 4 is selected the P4 microcomputer for use, internal memory 256M.
Under the control of clock signal that controller 3-4 provides, polynary detector of sound 3-1 realizes autoelectrinic scanning collection to imaging region in d/2 interval scan mode.Promptly each hot acoustical signals of the first reception of 11 groups of selecting, after the signal that receives amplifies by preamplifier, become 6 road signals by the multicircuit switch circuit conversion again, 6 road signals carry out synthetic one road signal in time delays compensation back by phase-adjusting circuit again, and 3-3 gathers into computer 4 for the high-speed signal acquisition card; At the next cycle of clock signal, 11 groups unit simultaneously forward translation d/2 enter next time and receive, and trigger microwave generator 1-1 and high-speed data acquisition card 3-3 synchronously.Each 11 group units selecting in fact equivalence are a detector that has very strong spatial directivity to point to, and on its relevant focus direction, it is identical owing to phase place is compensated that each detector receives signal, synthetic signal maximum; On the non-focusing direction of detector, the compensation of the signal phase of each detector is different, and signal cancels each other out.The conversion of signals of each the group detector collection in the unit of will shaking during imaging becomes the one dimension image, many groups one dimension image of a plurality of positions scanning is made up in order and back projection becomes two dimensional image, realizes that easily and fast the heat sound tomography of the intravital foreign body of thing detects.
(1) object under test is fixed on the sample platform, adopting wavelength is that 1mm～1m pulse microwave incides on the object under test, and the excitation object under test produces hot acoustical signal;
(2) under the control of LabVIEW capture program, drive multiple linear detector array or the hot acoustical signal of object under test rotation collection by motor, gather hot acoustical signal data simultaneously;
(3) utilize MATLAB software to the Signal Pretreatment of collection and the image reconstruction of back projection by computer, obtain the image of object under test then by backprojection algorithm.
The device that utilizes embodiment 1 detects rubber foreign body in the agar by the step of embodiment 2.Wherein the wavelength of microwave generator output pulse microwave is 25cm, and pulsewidth and repetition rate are elected 0.5us and 5.086Hz respectively as, and the angle of sample rotation is 180 °, and the rotation step-length of motor is 36 °, 5 of signals collecting positions.Obtain image as shown in Figure 3, by image as can be known, it can be well corresponding on characteristics such as relative position, shape, size with sample photo (Fig. 2), illustrate that method and apparatus of the present invention conforms to position, shape, the size of determinand to the determinand imaging, can detect accurately to foreign body.
Claims (8)
1, a kind of method of utilizing thermal acoustic imaging to detect foreign body may further comprise the steps:
(1) adopt pulse microwave to incide on the object under test, the excitation object under test produces hot acoustical signal;
(2) scanning of rotation object under test or detector of sound receives hot acoustical signal, gathers hot acoustical signal data simultaneously;
(3) after the application data process software carries out date processing to the hot acoustical signal of gathering, object layer to be measured is analysed imaging, obtain the image of object under test by backprojection algorithm.
2, a kind of method of utilizing thermal acoustic imaging to detect foreign body according to claim 1 is characterized in that in the described step (1), the wave-length coverage of described pulse microwave is 1mm～1m.
3, a kind of method of utilizing thermal acoustic imaging to detect foreign body according to claim 1, it is characterized in that, in the described step (2), described rotation and scanning are under the control of LabVIEW capture program, drive ultrasonic detector or the hot acoustical signal of object under test rotation collection by motor.
4, a kind of method of utilizing thermal acoustic imaging to detect foreign body according to claim 1 is characterized in that, in the described step (2), described detector of sound is the ultrasonic transducer of multiple linear detector array or single spy unit.
5, a kind of method of utilizing thermal acoustic imaging to detect foreign body according to claim 1, it is characterized in that, in the described step (3), described application data process software is analyzed and is handled the hot acoustical signal of gathering, and is to utilize MATLAB software to the hot acoustical signal pretreatment of collection and the image reconstruction of back projection by computer.
6, a kind of device of realizing the described method of claim 1 comprises microwave generating assembly, rotation sweep assembly, acoustical signal acquisition component, computer, sample fixation kit, acoustical coupling assembly; Microwave generating assembly, acoustical signal acquisition component, computer are electrically connected successively; Rotation sweep assembly and computer are electrically connected; The sample fixation kit places in the acoustical coupling assembly; Sample fixation kit and rotation sweep assembly are electrically connected.
7, device according to claim 6 is characterized in that, described microwave generating assembly is formed by connecting by microwave generator and waveguide mouth;
Described rotation sweep assembly is electrically connected by relay, motor and 3-D scanning platform and forms;
Described acoustical signal acquisition component is electrically connected successively by detector of sound, signal amplifier, controller and capture card and forms; Detector of sound is fixed on the 3-D scanning platform by support; Computer is electrically connected with relay, capture card simultaneously, and controller connects signal amplifier, capture card and microwave generator simultaneously;
Described sample fixation kit is that sample platform and sample fixture are formed; Sample platform and motor are electrically connected;
Described acoustical coupling assembly is made up of sample cell harmony coupling liquid; The sample platform places acoustical coupling liquid.
8, device according to claim 7 is characterized in that, described detector of sound is the ultrasonic transducer of multiple linear detector array or single spy unit.
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