CN103822877B - A kind of portable nonlinear optical acoustic imaging system and acousto-optic imaging method - Google Patents
A kind of portable nonlinear optical acoustic imaging system and acousto-optic imaging method Download PDFInfo
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- CN103822877B CN103822877B CN201410070339.9A CN201410070339A CN103822877B CN 103822877 B CN103822877 B CN 103822877B CN 201410070339 A CN201410070339 A CN 201410070339A CN 103822877 B CN103822877 B CN 103822877B
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Abstract
The present invention relates to a kind of portable nonlinear optical acoustic imaging system and acousto-optic imaging method, system includes laser scanning head, ultrasonic probe, preamplifier, oscillograph, lock-in amplifier and control module, the scanning area of described laser scanning head is the detection position of sample, described ultrasonic probe is located at the back side of sample, and just to scanning area, described ultrasonic probe by preamplifier respectively with oscillograph, lock-in amplifier connects, described control module respectively with lock-in amplifier, laser scanning head connects, described laser scanning head, oscillograph, connected by synchronous signal line between lock-in amplifier.Compared with prior art, the present invention has resolution height, realizes the advantage such as low cost, easy to operate, range wide, not damaged.
Description
Technical field
The present invention relates to a kind of photoacoustic imaging technology, especially relate to a kind of portable nonlinear optical acoustic imaging system
And acousto-optic imaging method.
Background technology
Photoacoustic imaging is a kind of Non-Destructive Testing formation method that development in recent years is got up, and it combines pure optical imagery
The high-penetration degree of depth of high-contrast and pure ultra sonic imaging, it is provided that high-resolution and the material of high-contrast and tissue
Imaging.Along with science and technology progress, material and tissue Dynamic Non-Destruction Measurement flourish, Ultrasonic NDT
Surpassed and phased array imaging development super to B ultrasonic C by traditional A based on waveshape feature abstraction, to ultra sonic imaging
Prescription is more and more higher.
In the range of the near-infrared " optical window " between 600～1300nm, the light transmission of biological tissue
Good, the absorption to light is little.Photoacoustic imaging technology has the biggest development in biological tissue is studied at present.Develop
Opto-acoustic microscopic imaging (Photo Acoustic Microscope, PAM), optoacoustic computed tomography (Photo
Acoustic Computing Tomograph, PACT), all utilize light to swash ultrasonic and tissue and structure function
The linear character of reflection or scattering reflects the fine structure of tissue, only with the fundamental frequency of institute's excitation ultrasound, and its
Ultrasonic and material structure effect generation high order the harmonics of fundamental frequency is left in the basket.Therefore entrained by ultrasound non-linear response signal
The fine structure information of tissue is left in the basket.
On the other hand B ultrasonic C is super and phased array supersonic imaging is all to use piezoelectric to realize between electric energy and acoustic energy
Conversion, due to material and the restriction of technique, probe difficulty realizes miniaturization, and ultrasonic frequency and spatial resolution have
The limit.Excited and accepted ultrasonic spatial resolution and be there is no the height of optoacoustic, and mostly can not be detected ultrasonic and group
The effect of knitting produces the harmonics of high order.Therefore the ultra sonic imaging of gained also have ignored the entrained tissue of nonlinear response signal
Fine structure.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and provide a kind of resolution high,
Realize low cost, easy to operate, range is wide, undamaged portable nonlinear optical acoustic imaging system and optoacoustic
Formation method, produces different fundamental frequency by change laser excitation frequency ultrasonic more ultrasonic by phase-locked extraction fundamental frequency
With the harmonics that material structure effect produces high order, the resolution of imaging will be improved, reflect the fine structure of material, no
Only can play preferably effect in biological tissue's Non-Destructive Testing, and have in traditional material field of ultrasonic nondestructive detection
Potential application prospect.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of portable nonlinear optical acoustic imaging system, it is characterised in that include laser scanning head, ultrasonic probe,
Preamplifier, oscillograph, lock-in amplifier and control module, the scanning area of described laser scanning head is sample
The detection position of product, described ultrasonic probe is located at the back side of sample, and just to scanning area, described ultrasonic spy
Head is connected with oscillograph, lock-in amplifier respectively by preamplifier, and described control module is put with phase-locked respectively
Big device, laser scanning head connect, and are believed by synchronization between described laser scanning head, oscillograph, lock-in amplifier
Number line connects.
The acousto-optic imaging method of a kind of portable nonlinear optical acoustic imaging system, it is characterised in that comprise the following steps:
1) fixed laser probe position, adjusts the distance between itself and sample, makes sample be positioned on its focal length；
2) scanning area of laser scanning head, and HONGGUANG instruction are set, observe the red light region of display on sample,
By adjusting scanning area coordinate parameters, making scanning area alignment sample need the part of detection, storage is corresponding sits
Mark parameter；
3) ultrasonic probe is placed on the sample back side, faces scanning area；
4) signal output part of ultrasonic probe being connected to preamplifier, the signal after amplifying is respectively outputted to
Oscillograph and lock-in amplifier, connect computer and the data line of lock-in amplifier, connects oscillograph, phase-locked puts
Big synchronous signal line between device and laser instrument；
5) laser scanning head is got ready, and by oscillograph observation signal, adjusts preamplifier and amplify to corresponding
Multiple, makes oscillograph output signal reach optimal；
6) scanning area parameter is set, gets frequency, dotting time and laser energy ready, described lock-in amplifier
Export the value of real part under fundamental frequency and two frequency-doubled signals and imaginary values to control module, described control module simultaneously
By being calculated the amplitude under this frequency and phase place, and exported amplitude figure and the phase place of this frequency by oscillograph
Figure；
7) change laser dotting frequency, obtain the imaging results under different frequency.
The material of described sample is metal, nonmetal, composite or biological tissue.
The mid frequency of described ultrasonic probe is 2.5MHz or 5MHz.
The amplification of described preamplifier is 40dB.
The frequency of getting ready of described laser scanning head is 1.6KHz～1MHz.
The focal length of described laser scanning head is 100mm.
Described control module is PC.
Compared with prior art, the invention have the advantages that
1) resolution is high, uses frequency doubling non-linear's formation method, and imaging resolution is higher；
2) realizing low cost, cost is lower compared with traditional CT imaging；
3) easy to operate, this device can be portable, can realize field quick detection；
4) range is wide, detected body can be carried out large-scale fast scan imaging；
5) detected body is not damaged by this device.
Accompanying drawing explanation
Fig. 1 is photoacoustic imaging system structured flowchart of the present invention.
Image under the 100KHz that Fig. 2 is obtained by apparatus of the present invention；
Image under the 200KHz that Fig. 3 is obtained by apparatus of the present invention.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
As it is shown in figure 1, a kind of portable nonlinear optical acoustic imaging system, including laser scanning head 1, ultrasonic probe
6, preamplifier 5, oscillograph 4, lock-in amplifier 3 and control module 2, described laser scanning head 1
Scanning area is the detection position of sample, and described ultrasonic probe 6 is located at the back side of sample, and just to scanning area,
Described ultrasonic probe 6 is connected with oscillograph 4, lock-in amplifier 3 respectively by preamplifier 5, described
Control module 2 is connected with lock-in amplifier 3, laser scanning head 1 respectively, described laser scanning head 1, oscillography
Connected by synchronous signal line between device 4, lock-in amplifier 3.Described control module 2 is PC.
Wherein laser scanning head 1 includes two dimension word galvanometers, and condenser lens and light path dynamically adjust and control, and by
PC controls based on MATLAB graphical interfaces composition open system, ultrasonic signal amplifies collection and is processed into picture
System.
The present embodiment is scanned imaging for utilizing nonlinear optical acoustic imaging apparatus to sample internal flaw.Concrete measurement
Process is:
1, drilling machine is utilized to form a diameter about 2 at long 200mm, wide 50mm, the aluminium sheet side of thick 4mm
The hole that millimeters deep is 10 millimeters；
2, by aluminium sheet as on object stage, the distance of it and laser scanning head is adjusted so that it is be positioned at laser scanning head
Focal length on；
3, open laser scanning head, adjust the position of scanning area covering part hole, write down corresponding scanning
Region parameter；
4, oscillograph, preamplifier, lock-in amplifier, receiving transducer, the letter between optical fiber laser are connected
Number transmission line and signal line synchro；
5, using laser scanning head to get ready, regulation preamplifier is to suitable amplification；
6, open nonlinear optical acoustic imaging system, input scanning area (recording in step 3), get frequency ready, beat
Point time, laser energy parameter, operation is got ready, directly exports corresponding image；
7, change laser dotting frequency, obtain the imaging results under different frequency.100kHz as shown in Figures 2 and 3
A () is different from the ultrasonic frequency excited under 200kHz (b) laser dotting frequency, itself and the effect model in hole
Enclosing difference, therefore imaging is different, the hole defect size information of reaction different depth.
Claims (7)
1. the acousto-optic imaging method of a portable nonlinear optical acoustic imaging system, it is characterised in that described one-tenth
As system includes laser scanning head, ultrasonic probe, preamplifier, oscillograph, lock-in amplifier and control module,
The scanning area of described laser scanning head is the detection position of sample, and described ultrasonic probe is located at the back of the body of sample
Face, and just to scanning area, described ultrasonic probe by preamplifier respectively with oscillograph, lock-in amplifier
Connecting, described control module is connected with lock-in amplifier, laser scanning head respectively, described laser scanning head,
Being connected by synchronous signal line between oscillograph, lock-in amplifier, described acousto-optic imaging method comprises the following steps:
1) fixed laser probe position, adjusts the distance between itself and sample, makes sample be positioned on its focal length；
2) scanning area of laser scanning head, and HONGGUANG instruction are set, observe the red light region of display on sample,
By adjusting scanning area coordinate parameters, making scanning area alignment sample need the part of detection, storage is corresponding sits
Mark parameter；
3) ultrasonic probe is placed on the sample back side, faces scanning area；
4) signal output part of ultrasonic probe being connected to preamplifier, the signal after amplifying is respectively outputted to
The data line of oscillograph and lock-in amplifier, link control module and lock-in amplifier, connects oscillograph, lock
Synchronous signal line between phase amplifier and laser instrument；
5) laser scanning head is got ready, and by oscillograph observation signal, adjusts preamplifier and amplify to corresponding
Multiple, makes oscillograph output signal reach optimal；
6) scanning area parameter is set, gets frequency, dotting time and laser energy ready, described lock-in amplifier
Export the value of real part under fundamental frequency and two frequency-doubled signals and imaginary values to control module, described control module simultaneously
By being calculated the amplitude under this frequency and phase place, and exported amplitude figure and the phase place of this frequency by oscillograph
Figure；
7) change laser dotting frequency, obtain the imaging results under different frequency；
Described laser scanning head includes two dimension word galvanometers, and condenser lens and light path dynamically adjust and control.
A kind of acousto-optic imaging method the most according to claim 1, it is characterised in that the material of described sample
Matter is biological tissue.
A kind of acousto-optic imaging method the most according to claim 1, it is characterised in that described ultrasonic probe
Mid frequency be 2.5MHz or 5MHz.
A kind of acousto-optic imaging method the most according to claim 1, it is characterised in that described preposition amplification
The amplification of device is 40dB.
A kind of acousto-optic imaging method the most according to claim 1, it is characterised in that described laser scanning
The frequency of getting ready of head is 1.6KHz～1MHz.
A kind of acousto-optic imaging method the most according to claim 1, it is characterised in that described laser scanning
The focal length of head is 100mm.
A kind of acousto-optic imaging method the most according to claim 1, it is characterised in that described control module
For PC.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105372328B (en) * | 2015-11-02 | 2019-02-19 | 侬泰轲（上海）检测科技有限责任公司 | A kind of detection device and detection method |
| CN106018283B (en) * | 2016-05-09 | 2019-04-16 | 高飞 | Single laser pulse induces the method and device of double nonlinear optical acoustical signals |
| CN106370602A (en) * | 2016-08-31 | 2017-02-01 | 纳路易爱姆斯株式会社 | Large-sized structure ultrasonic examination method and system using unmanned aerial vehicles |
| CN109507117B (en) * | 2018-11-12 | 2020-04-03 | 中国科学技术大学 | Micro-nano imaging detection experimental device based on photoacoustic beam shaping |
| CN110763766B (en) * | 2019-09-26 | 2022-03-08 | 山东省科学院海洋仪器仪表研究所 | Laser ultrasonic phase-locking detection system and method for turbine blade surface microdefects |
| CN111830134A (en) * | 2020-07-15 | 2020-10-27 | 上海工程技术大学 | Ultrasonic nondestructive testing system |
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