CN105903667A - Dual-frequency hollow focused ultrasonic detector - Google Patents
Dual-frequency hollow focused ultrasonic detector Download PDFInfo
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- CN105903667A CN105903667A CN201610307366.2A CN201610307366A CN105903667A CN 105903667 A CN105903667 A CN 105903667A CN 201610307366 A CN201610307366 A CN 201610307366A CN 105903667 A CN105903667 A CN 105903667A
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- 238000002604 ultrasonography Methods 0.000 claims description 39
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0688—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction with foil-type piezoelectric elements, e.g. PVDF
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
Abstract
The invention relates to a dual-frequency hollow focused ultrasonic detector. The detector comprises a cylindrical shell, an acoustic focusing lens arranged in the shell, an annular sound absorption material layer, an annular back lining material layer, annular ultrasonic transducers and a signal line, wherein the annular sound absorption material layer and the annular back lining material layer are arranged in the shell in an overlapped mode, the annular ultrasonic transducers are arranged on the back lining material layer and face the acoustic focusing lens, and the signal line is electrically connected with the ultrasonic transducers. A line outlet for leading out the signal line is formed in the sidewall of the shell. The acoustic focusing lens comprises a semispherical first lens part and a similar-conical second lens part, an incident laser is coaxial with the detector, the resolution is enhanced, the detection sensitivity is improved, and the imaging effect is good; by means of the first lens part and the second lens part adopting two different acoustic-impedance acoustic materials, photo-acoustic signal collimation is achieved, acoustic focusing is achieved, and the acoustic resolution is enhanced. The ultrasonic transducers with two different dominant frequencies are adopted, the wide-band performance of the dual-frequency hollow focused ultrasonic detector is improved, and more pathologic messages of a detected portion in the transverse direction and the longitudinal direction can be obtained.
Description
Technical field
The present invention relates to technical field of photoacoustic, particularly relate to a kind of double frequency hollow and focus on ultrasonic detector.
Background technology
Photoacoustic imaging is a kind of Novel lossless biomedical imaging technology of development in recent years, and it combines high-contrast and the high-resolution advantage of pure ultra sonic imaging of pure optical imagery.This imaging technique is using short-pulse laser as driving source, and the ultrasonic signal thus excited is as information carrier, is rebuild the formation method of organization internal 26S Proteasome Structure and Function information by corresponding image reconstruction algorithm.This technology combines the feature of optical imagery and acoustics imaging, it is possible to provide the tissue tomographic map of deep tissues high-resolution and high-contrast, is with a wide range of applications in biomedical clinical diagnosis and imaging in vivo field.
At present, the ultrasonic detector of photoacoustic imaging is non-hollow ultrasonic detector mostly, it cannot be guaranteed that incident illumination is coaxial with ultrasonic detector, to such an extent as to it is difficult to improve resolution and the detection sensitivity of micro imaging system, effective transmission of laser to be ensured in whole light path simultaneously, image effect can not reach optimal；Although also having ultrasonic detector to use the pattern of hollow, but operationally inconvenience couple with detection site surface, it is impossible to being completely suitable for the application clinically of optoacoustic microsurgical instrument；And, the frequency band of existing ultrasonic detector is narrow, it is difficult to extract the organizational information of more detection site.
Summary of the invention
Based on this, it is necessary to for the problems referred to above, it is provided that a kind of double frequency hollow focuses on ultrasonic detector.This double frequency hollow ultrasonic detector have preferably imaging effect, be easy to couple with detection site surface, broadband, practical feature, can adaptive various ultrasonic/opto-acoustic microscopic imaging systems, it is often more important that the ultrasonic/opto-acoustic microscopic imaging instrument of Clinical detection can be adapted to.
A kind of double frequency hollow focuses on ultrasonic detector, including: cylindrical case, be located at the Acoustic focusing lens of the one end of described shell, stacking is arranged at ring-type sound-absorbing material layer and ring-type backing material, the ring-type ultrasonic transducer be located on described backing material and arrange towards described Acoustic focusing lens and the holding wire being electrically connected with described ultrasonic transducer of described enclosure；The sidewall of described shell offers the wire hole for drawing described holding wire；Described Acoustic focusing lens include the first lens section of hemispherical structure and the second lens section in conoid structure, and the bottom surface of described second lens section offers hemispherical groove, and described first lens section is embedded in described hemispherical groove；The middle part of described first lens section offers light hole, and described sound-absorbing material layer, described backing material, described ultrasonic transducer and described Acoustic focusing lens are coaxially disposed；Described ultrasonic transducer includes the ring-type low frequency ultrasound transducer being positioned at inner ring and is positioned at the ring-type high-frequency transducer of outer ring, and described low frequency ultrasound transducer is coaxially disposed with described high-frequency transducer.
Wherein in an embodiment, in described low frequency ultrasound transducer and described high-frequency transducer, piezoelectric element is PVDF piezoelectric membrane, and the thickness of the PVDF piezoelectric membrane of described low frequency ultrasound transducer is more than the thickness of the PVDF piezoelectric membrane of described high-frequency transducer.
Wherein in an embodiment, described sound-absorbing material layer includes that mass ratio is the epoxy resin of 1.35:0.5 ~ 2:1 ~ 5:0.02 ~ 0.1, alumina powder, glass microsphere, carbon dust, processes through stirring mixing, evacuation, baking and curing.
Wherein in an embodiment, described backing material includes that mass ratio is the epoxy resin of 1.35:1 ~ 3:0.02 ~ 0.1, alumina powder, carbon dust, processes through stirring mixing, evacuation, baking and curing.
Wherein in an embodiment, described first lens section is the close medium of sound relative to described second lens section, and described second lens section is that sound dredges medium relative to described first lens section.
Wherein in an embodiment, described first lens section is made up of PVC plastic, and described second lens section is made up of water white PMMA plastics.
Wherein in an embodiment, the upper bottom surface of described second lens section is burnishing surface, and the side of described second lens section is frosting.
Wherein in an embodiment, between described sound-absorbing material layer and described backing material, it is pasted together by optical resin glue between described first lens section and described second lens section.
Wherein in an embodiment, also including: the first silver medal band, the second silver medal band and pcb board, described pcb board is located on described sound-absorbing material layer, and described pcb board is provided with anelectrode junction point and negative electrode junction point；Described first silver medal band is electrically connected with the anelectrode of described anelectrode junction point and described high-frequency transducer and described low frequency ultrasound transducer respectively, and described second silver medal band negative electrode with described negative electrode junction point and described high-frequency transducer and described low frequency ultrasound transducer respectively is electrically connected with；Described holding wire includes: the second heart yearn that the first heart yearn welded with described anelectrode junction point welds with described negative electrode junction point and the ground wire being electrically connected with described shell.
Wherein in an embodiment, the number of described pcb board is two, and described anelectrode junction point and described negative electrode junction point one_to_one corresponding respectively are located on two described pcb boards.
In actual applications, it is coaxial that incident laser and double frequency hollow focus on ultrasonic detector, to ensure effective transmission of incident laser in whole light path, improves resolution and the detection sensitivity of system, and imaging effect is preferable；The first lens section of acoustic impedance acoustical material and the second lens section do not realize photoacoustic signal collimation to utilize two kinds, thus improve the sensitivity of photoacoustic signal detection, realize Acoustic focusing simultaneously, reduce double frequency hollow and focus on the sound field diameter of ultrasonic detector, thus improve acoustics resolution.
Double frequency hollow focuses on ultrasonic detector and includes low frequency ultrasound transducer and the high-frequency transducer of two kinds of different dominant frequency, there are two kinds of different acoustic frequencies band, can effectively improve double frequency hollow by bandwidth superposition and focus on the broad band performance of ultrasonic detector, the most more pathological informations of detection site can be obtained；According to Huygen's principle, Helmhots-Kirchohoff integration theorem is utilized to calculate the transmitting sound field of ultrasound element, by changing different ultrasound element diameter, array element dominant frequency observes sound Jiao's length, focused spot diameter, the change of depth of focus, can effectively increase the depth of focus length of sound field, achieve the multiple dimensioned imaging in the vertical of ultrasonic/opto-acoustic microscopic imaging system, can obtain more pathological informations in the longitudinal direction of detection site, imaging effect is preferable.
Accompanying drawing explanation
Fig. 1 is the structural representation of the double frequency hollow focusing ultrasonic detector of a preferred embodiment of the present invention；
Fig. 2 is the sectional view that double frequency hollow shown in Fig. 1 focuses on ultrasonic detector；
Fig. 3 is echo-signal time-domain diagram and the frequency domain figure of low frequency ultrasound transducer shown in Fig. 2；
Fig. 4 is echo-signal time-domain diagram and the frequency domain figure of high-frequency transducer shown in Fig. 2.
Detailed description of the invention
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is described more fully.Accompanying drawing gives presently preferred embodiments of the present invention.But, the present invention can realize in many different forms, however it is not limited to embodiment described herein.On the contrary, providing the purpose of these embodiments is to make the understanding to the disclosure more thorough comprehensively.
As depicted in figs. 1 and 2, the double frequency hollow of a preferred embodiment of the present invention focuses on ultrasonic detector 100, including: cylindrical case 10, Acoustic focusing lens, ring-type sound-absorbing material layer 20, ring-type backing material 30, ring-type ultrasonic transducer and the holding wire (not shown) being electrically connected with ultrasonic transducer.Shell 10 has the duct 13 of first end 11, the second end 12 and through first end 11 and the second end 12.
The first end 11 of shell 10 is located at by Acoustic focusing lens, and Acoustic focusing lens include the first lens section 50 of hemispherical structure and the second lens section 60 in conoid structure.Second lens section 60 includes frustum of a cone and cylinder, and frustum of a cone is one-body molded with cylinder.In second lens section 60 connected mode with shell 10, both can use as shown in Figure 2, the cylinder of the second lens section 60 is embedded shell 10, and by glue, the second lens section 60 is cemented with shell 10, it would however also be possible to employ the mode that the cylinder of the second lens section 60 is threaded connection with shell 10.
The outer wall of the second end 12 of shell 10 is provided with external screw thread 121, it is simple to the mode being threaded connection is arranged on ultrasonic/opto-acoustic microscopic imaging instrument.The sidewall of shell 10 offers the wire hole 14 for drawing holding wire.
Second lens section 60 has upper bottom surface 61, bottom surface 62 and the side between upper bottom surface 61 and bottom surface 62 63, and wherein, the area of upper bottom surface 61 is less than the area of bottom surface 62.The upper bottom surface 61 of the second lens section 60 is burnishing surface, for receiving the ultrasound wave that the human body detection site of vertical incidence sends in photoacoustic imaging, it is simple to couple with detection site surface.The side 63 of the second lens section 60 is frosting, prevents outside mixed and disorderly ultrasound wave from being entered by side 63, has filter effect.First lens section 50 is the close medium of sound relative to the second lens section 60, and the second lens section 60 dredges medium relative to the first lens section 50 for sound.Such as, the first lens section 50 is by PVC(polyvinyl chloride, polrvinyl chloride) plastics make, and the velocity of sound is 2.04km/s；Second lens section 60 is by water white PMMA(polymethyl methacrylate, polymethyl methacrylate) plastics make, and the velocity of sound is 2.72km/s, and light transmittance is more than 95%.The bottom surface 62 of the second lens section 60 offers hemispherical groove, first lens section 50 is embedded in hemispherical groove, the middle part of the first lens section 50 offers light hole 51, the radius of curvature of the second lens section 60 is identical with the radius of curvature of hemispherical groove, such as, the radius of curvature of the first lens section 50 and hemispherical groove is 5mm, and the aperture of light hole 51 is 2mm.It should be noted that the convex spherical of the first lens section 50 is through physics polishing, optical resin glue is used to be pasted onto in the hemispherical groove of the second lens section 60 by the first lens section 50.The first lens section 50 and the second lens section 60 arranged coaxial, bubble-free between the two is guaranteed in taping process.
Sound-absorbing material layer 20 and backing material 30 stacking are arranged in the duct 13 of shell 10, it is also preferred that the left be pasted together by optical resin glue between sound-absorbing material layer 20 and backing material 30.In the present embodiment, sound-absorbing material layer 20 includes that mass ratio is the epoxy resin of 1.35:0.5 ~ 2:1 ~ 5:0.02 ~ 0.1, alumina powder, glass microsphere, carbon dust, through stirring mixing, evacuation, baking and curing process, so be fabricated to external diameter be 12mm, internal diameter be 2mm, thickness be the sound-absorbing material layer 20 of 2mm.Backing material 30 includes that mass ratio is the epoxy resin of 1.35:1 ~ 3:0.02 ~ 0.1, alumina powder, carbon dust, process through stirring mixing, evacuation, baking and curing, and then be fabricated to external diameter be 12mm, internal diameter be 2mm, thickness be the backing material 30 of 3mm, the surface requirements of backing material 30 is smooth, smooth.
Ultrasonic transducer is located on backing material 30 and is arranged towards Acoustic focusing lens, and sound-absorbing material layer 20, backing material 30, ultrasonic transducer and Acoustic focusing lens are coaxially disposed.Ultrasonic transducer includes the ring-type low frequency ultrasound transducer 41 being positioned at inner ring and is positioned at the ring-type high-frequency transducer 42 of outer ring, and low frequency ultrasound transducer 41 is coaxially disposed with high-frequency transducer 42.In low frequency ultrasound transducer 41 and high-frequency transducer 42, piezoelectric element is PVDF(polyvinylidene fluoride, polyvinyladine floride) piezoelectric membrane, the thickness of the PVDF piezoelectric membrane of low frequency ultrasound transducer 41 is more than the thickness of the PVDF piezoelectric membrane of high-frequency transducer 42.Such as, the thickness of the PVDF piezoelectric membrane of low frequency ultrasound transducer 41 is 50 μm, and the thickness of the PVDF piezoelectric membrane of high-frequency transducer 42 is 25 μm.In the present embodiment, cutting out internal diameter respectively initially with laser cutting machine is 2mm, external diameter is 4mm, thickness is the PVDF piezoelectric membrane of the low frequency ultrasound transducer 41 of 50 μm and internal diameter is 6mm, external diameter is 8mm, thickness is the PVDF piezoelectric membrane of the high-frequency transducer 42 of 25 μm, after tested, the dominant frequency of low frequency ultrasound transducer 41 is 15MHz, the dominant frequency of high-frequency transducer 42 is 30MHz, then fixture is utilized respectively the PVDF piezoelectric membrane of low frequency ultrasound transducer 41 and high-frequency transducer 42 to be fixed, after leveling, finally with optics epoxy resin glue, the PVDF piezoelectric membrane of low frequency ultrasound transducer 41 and high-frequency transducer 42 is respectively adhered on backing material 30.It should be noted that the smooth corrugationless of PVDF piezoelectric membrane of low frequency ultrasound transducer 41 to be ensured and high-frequency transducer 42 in taping process, and optical resin glue to process through evacuating bubble removing.
Double frequency hollow focuses on ultrasonic detector 100 and also includes: the first silver medal band, the second silver medal band and pcb board.Such as, the thickness of the first silver medal band and the second silver medal band be 10 μm, width be 1mm, a length of 1cm.Such as, the thickness of pcb board is 0.2mm, a length of 1mm, and width is 1mm.Pcb board is located on sound-absorbing material layer 20, and pcb board is provided with anelectrode junction point and negative electrode junction point.First silver medal band is close to the inwall of shell 10 and is arranged, and be electrically connected with the anelectrode of anelectrode junction point and high-frequency transducer and low frequency ultrasound transducer respectively, second silver medal band is close to the inwall of shell 10 and is arranged, and is electrically connected with the negative electrode of negative electrode junction point and high-frequency transducer and low frequency ultrasound transducer respectively.Holding wire includes: the second heart yearn that the first heart yearn welded with anelectrode junction point welds with negative electrode junction point and the ground wire being electrically connected with shell.In the present embodiment, the number of pcb board is two, and anelectrode junction point is located on first pcb board, and negative electrode junction point is located on second pcb board.
In order to test the performance of the transmitting/receiving signal of low frequency ultrasound transducer 41 and high-frequency transducer 42, test as follows:
Using Olympus 5800PR ultrasonic generator as trigger signal source, its emissive porwer is 12.5 μ J, input damping is 1KHz for 36Ohm, pulse recurrence frequency；Taylor oscillograph TDS2012B is as echo signal reception device；PS(Polystyrene, polystyrene) plate of material is as test block, and the thickness of this test block is 10mm, the velocity of sound is 2350m/s.
First, Olympus 5800PR ultrasonic generator, Taylor oscillograph TDS2012B connect low frequency ultrasound transducer 41 and high-frequency transducer 42 the most respectively；Secondly, Olympus 5800PR ultrasonic generator is placed in transmitting/reception state, upper surface in test block coats appropriate couplant, and then, the most respectively low frequency ultrasound transducer 41 and high-frequency transducer 42 are placed on the upper surface of test block, now can demonstrate low frequency ultrasound transducer 41 and the ultrasound echo signal of high-frequency transducer 42 on Taylor's oscillograph TDS2012B successively, till treating that the peak-to-peak value of the echo-signal on Taylor oscillograph TDS2012B reaches maximum, now gather the data of echo-signal, incoming for data computer system is processed, obtain echo-signal time-domain diagram and the frequency domain figure of low frequency ultrasound transducer 41 as shown in Figure 3, and the echo-signal time-domain diagram of high-frequency transducer 42 as shown in Figure 4 and frequency domain figure.
In actual applications, it is coaxial that incident laser A and double frequency hollow focus on ultrasonic detector 100, to ensure effective transmission of incident laser A in whole light path, improves resolution and the detection sensitivity of system, and imaging effect is preferable；The first lens section of acoustic impedance acoustical material and the second lens section do not realize photoacoustic signal collimation to utilize two kinds, thus improve the sensitivity of photoacoustic signal detection, realize Acoustic focusing simultaneously, reduce double frequency hollow and focus on the sound field diameter of ultrasonic detector 100, thus improve acoustics resolution.
Double frequency hollow focuses on ultrasonic detector 100 and includes low frequency ultrasound transducer 41 and the high-frequency transducer 42 of two kinds of different dominant frequency, there are two kinds of different acoustic frequencies band, can effectively improve double frequency hollow by bandwidth superposition and focus on the broad band performance of ultrasonic detector 100, the most more pathological informations of detection site can be obtained；According to Huygen's principle, Helmhots-Kirchohoff integration theorem is utilized to calculate the transmitting sound field of ultrasound element, by changing different ultrasound element diameter, array element dominant frequency observes sound Jiao's length, focused spot diameter, the change of depth of focus, can effectively increase the depth of focus length of sound field, achieve the multiple dimensioned imaging in the vertical of ultrasonic/opto-acoustic microscopic imaging system, can obtain more pathological informations in the longitudinal direction of detection site, imaging effect is preferable.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a double frequency hollow focuses on ultrasonic detector, it is characterized in that, including: cylindrical case, be located at the Acoustic focusing lens of the one end of described shell, stacking is arranged at ring-type sound-absorbing material layer and ring-type backing material, the ring-type ultrasonic transducer be located on described backing material and arrange towards described Acoustic focusing lens and the holding wire being electrically connected with described ultrasonic transducer of described enclosure；The sidewall of described shell offers the wire hole for drawing described holding wire；Described Acoustic focusing lens include the first lens section of hemispherical structure and the second lens section in conoid structure, and the bottom surface of described second lens section offers hemispherical groove, and described first lens section is embedded in described hemispherical groove；The middle part of described first lens section offers light hole, and described sound-absorbing material layer, described backing material, described ultrasonic transducer and described Acoustic focusing lens are coaxially disposed；Described ultrasonic transducer includes the ring-type low frequency ultrasound transducer being positioned at inner ring and is positioned at the ring-type high-frequency transducer of outer ring, and described low frequency ultrasound transducer is coaxially disposed with described high-frequency transducer.
Double frequency hollow the most according to claim 1 focuses on ultrasonic detector, it is characterized in that, in described low frequency ultrasound transducer and described high-frequency transducer, piezoelectric element is PVDF piezoelectric membrane, and the thickness of the PVDF piezoelectric membrane of described low frequency ultrasound transducer is more than the thickness of the PVDF piezoelectric membrane of described high-frequency transducer.
Double frequency hollow the most according to claim 1 focuses on ultrasonic detector, it is characterized in that, described sound-absorbing material layer includes that mass ratio is the epoxy resin of 1.35:0.5 ~ 2:1 ~ 5:0.02 ~ 0.1, alumina powder, glass microsphere, carbon dust, processes through stirring mixing, evacuation, baking and curing.
Double frequency hollow the most according to claim 1 focuses on ultrasonic detector, it is characterized in that, described backing material includes that mass ratio is the epoxy resin of 1.35:1 ~ 3:0.02 ~ 0.1, alumina powder, carbon dust, processes through stirring mixing, evacuation, baking and curing.
Double frequency hollow the most according to claim 1 focuses on ultrasonic detector, it is characterised in that described first lens section is the close medium of sound relative to described second lens section, and described second lens section is that sound dredges medium relative to described first lens section.
Double frequency hollow the most according to claim 5 focuses on ultrasonic detector, it is characterised in that described first lens section is made up of PVC plastic, and described second lens section is made up of water white PMMA plastics.
Double frequency hollow the most according to claim 1 focuses on ultrasonic detector, it is characterised in that the upper bottom surface of described second lens section is burnishing surface, and the side of described second lens section is frosting.
Double frequency hollow the most according to claim 1 focuses on ultrasonic detector, it is characterised in that between described sound-absorbing material layer and described backing material, be pasted together by optical resin glue between described first lens section and described second lens section.
Double frequency hollow the most according to claim 1 focuses on ultrasonic detector, it is characterized in that, also including: the first silver medal band, the second silver medal band and pcb board, described pcb board is located on described sound-absorbing material layer, and described pcb board is provided with anelectrode junction point and negative electrode junction point；Described first silver medal band is electrically connected with the anelectrode of described anelectrode junction point and described high-frequency transducer and described low frequency ultrasound transducer respectively, and described second silver medal band negative electrode with described negative electrode junction point and described high-frequency transducer and described low frequency ultrasound transducer respectively is electrically connected with；Described holding wire includes: the second heart yearn that the first heart yearn welded with described anelectrode junction point welds with described negative electrode junction point and the ground wire being electrically connected with described shell.
Double frequency hollow the most according to claim 9 focuses on ultrasonic detector, it is characterised in that the number of described pcb board is two, and described anelectrode junction point and described negative electrode junction point one_to_one corresponding respectively are located on two described pcb boards.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106333650A (en) * | 2016-09-26 | 2017-01-18 | 华南师范大学 | Multi-scale photo-acoustic micro-imaging device and multi-scale photo-acoustic micro-imaging method |
| CN106556440A (en) * | 2017-01-24 | 2017-04-05 | 厦门大学 | A kind of transit time ultrasonic flow meters |
| CN106901777A (en) * | 2017-02-24 | 2017-06-30 | 华中科技大学 | A kind of multifunction supersonic probe and capilary imaging and VPV detection method |
| CN107007300A (en) * | 2017-03-08 | 2017-08-04 | 上海交通大学 | A kind of multifrequency list for muscle group motion detection shakes first ultrasonic transducer |
| CN107260213A (en) * | 2017-07-04 | 2017-10-20 | 中国科学院苏州生物医学工程技术研究所 | Ultrasonic probe and apply its ultrasonic image-forming system |
| CN108593783A (en) * | 2017-11-16 | 2018-09-28 | 浙江大学 | A kind of double-frequency confocal ultrasonic transducer |
| CN112505156A (en) * | 2020-12-15 | 2021-03-16 | 爱德森（厦门）电子有限公司 | Pulse echo ultrasonic and mechanical impedance integrated detection method and device |
| CN113477495A (en) * | 2021-06-26 | 2021-10-08 | 西北工业大学 | Dual-frequency long-focus deep ultrasonic transducer based on stack arrangement |
| CN113533527A (en) * | 2021-06-26 | 2021-10-22 | 西北工业大学 | Aspheric surface focusing deep-scene ultrasonic detector and method |
| CN113640392A (en) * | 2021-07-29 | 2021-11-12 | 华南师范大学 | High-sensitivity full-transparent photoacoustic detector based on transparent flexible composite electrode and endoscopic device |
| CN116710771A (en) * | 2021-01-12 | 2023-09-05 | 安德拉生命科学公司 | Acoustic isolation thermoacoustic imaging probe and method of making same |
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