CN110470734B - Adjustable frequency ultrasonic probe - Google Patents
Adjustable frequency ultrasonic probe Download PDFInfo
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- CN110470734B CN110470734B CN201910722822.3A CN201910722822A CN110470734B CN 110470734 B CN110470734 B CN 110470734B CN 201910722822 A CN201910722822 A CN 201910722822A CN 110470734 B CN110470734 B CN 110470734B
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- 239000000523 sample Substances 0.000 title claims abstract description 35
- 239000000919 ceramic Substances 0.000 claims abstract description 81
- 229910052751 metal Inorganic materials 0.000 claims abstract description 39
- 239000002184 metal Substances 0.000 claims abstract description 39
- 239000002131 composite material Substances 0.000 claims abstract description 3
- 125000006850 spacer group Chemical group 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 239000007769 metal material Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims 1
- 229920000647 polyepoxide Polymers 0.000 claims 1
- 230000007547 defect Effects 0.000 description 6
- 230000005284 excitation Effects 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2437—Piezoelectric probes
- G01N29/245—Ceramic probes, e.g. lead zirconate titanate [PZT] probes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention provides a frequency-adjustable ultrasonic probe, which comprises: the piezoelectric ceramic composite material comprises a metal shell, an inner liner, a plurality of piezoelectric ceramic layers and a plurality of spacing layers; the inner lining is arranged at the center of the accommodating cavity of the metal shell; a plurality of piezoelectric ceramic layers are arranged between the outer wall of the inner liner and the inner wall of the metal shell; a spacing layer is arranged between every two adjacent piezoelectric ceramic layers; the outer wall of each piezoelectric ceramic layer is a negative electrode, and the inner wall is a positive electrode; each piezoelectric ceramic layer has a different resonant frequency; the inner wall of one side of each piezoelectric ceramic layer at the central wire outlet is provided with a positive electrode lug, and the outer wall of the other side of each piezoelectric ceramic layer at the central wire outlet is provided with a negative electrode lug; each negative electrode lug is connected with each other through a negative electrode lead; each positive electrode lug plate is connected with a positive electrode lead; each positive electrode lead extends out of the metal shell through the central wire outlet hole. The invention can generate one or more ultrasonic signals with different frequencies according to the requirement.
Description
Technical Field
The application relates to the technical field of nondestructive testing, in particular to a frequency-adjustable ultrasonic probe.
Background
For concrete modules with large-volume concrete structures or complex structures, defects possibly existing in the structures cannot be detected from the outside by using the traditional ultrasonic defect detection method due to oversized size or complex structure.
Although some detection devices which can be pre-buried in a structure to be detected are already proposed in the prior art, the detection devices generally only can send detection signals with fixed frequency, so that the detection devices are difficult to be suitable for detecting and judging internal defects of concrete structures with different distances and different sizes.
Disclosure of Invention
In view of this, the present invention provides a tunable ultrasonic probe that can generate one or more ultrasonic signals of different frequencies as desired.
The technical scheme of the invention is realized specifically as follows:
a tunable frequency ultrasonic probe, the tunable frequency ultrasonic probe comprising: the piezoelectric ceramic composite material comprises a metal shell, an inner liner, a plurality of piezoelectric ceramic layers and a plurality of spacing layers;
the metal shell is internally provided with a containing cavity;
The inner lining is arranged at the center of the accommodating cavity of the metal shell and is used for counteracting and absorbing ultrasonic signals generated in the inner side direction when the piezoelectric ceramic layer vibrates;
A plurality of piezoelectric ceramic layers are arranged between the outer wall of the lining and the inner wall of the metal shell; the piezoelectric ceramic layer of the innermost layer covers the outer surface of the lining; the metal shell covers the outer surface of the piezoelectric ceramic layer of the outermost layer; a spacing layer is arranged between every two adjacent piezoelectric ceramic layers;
The outer wall of each piezoelectric ceramic layer is a negative electrode, and the inner wall is a positive electrode; each piezoelectric ceramic layer has a different resonant frequency;
the central wire outlet hole is arranged in the metal shell, each piezoelectric ceramic layer and each spacing layer in a penetrating way;
The inner wall of one side of each piezoelectric ceramic layer at the central wire outlet is provided with a positive electrode lug, and the outer wall of the other side of each piezoelectric ceramic layer at the central wire outlet is provided with a negative electrode lug; the negative electrode lug of the piezoelectric ceramic layer at the outermost layer is connected with the inner wall of the metal shell;
Each negative electrode lug is connected with each other through a negative electrode lead; each positive electrode lug plate is connected with a positive electrode lead; each positive electrode lead extends out of the metal shell through the central wire outlet hole.
Preferably, the inner liner is spherical; the metal shell, the piezoelectric ceramic layers and the spacer layers are spherical shells.
Preferably, each piezoelectric ceramic layer comprises two hemispherical shells which are connected together at the top and bottom respectively.
Preferably, the inner wall and the outer wall of the bottom joint of the two hemispheric shells are provided with jumper sheets with electric conduction performance.
Preferably, the jumper sheet can be arranged on the inner wall and the outer wall of the bottom joint of the two hemispherical shells in an adhesive or welding mode.
Preferably, the jumper is made of copper.
Preferably, the piezoelectric ceramic layer is a spherical shell-shaped piezoelectric ceramic wafer.
Preferably, the liner is pressed from metal powder and epoxy.
Preferably, the spacer layer is made of a metal material whose surface is subjected to an insulation treatment.
Preferably, the number of the piezoelectric ceramic layers is 4, and the number of the spacing layers is 3.
As can be seen from the above, in the tunable ultrasonic probe of the present invention, a multi-layer cladding structure is adopted, and mainly comprises: a metal shell, an inner liner, a plurality of piezoelectric ceramic layers and a plurality of spacing layers. Because each piezoelectric ceramic layer has different resonant frequencies, ultrasonic signals with different frequencies can be generated under the excitation of different voltages, when the adjustable frequency ultrasonic probe is used, the adjustable frequency ultrasonic probe can be pre-buried in a structure to be tested, then the adjustable frequency ultrasonic probe is controlled by an instrument, and according to actual needs, one or a plurality of piezoelectric ceramic layers are respectively excited, and all piezoelectric ceramic layers can be excited at the same time, so that one or more ultrasonic signals with different frequencies are generated, the ultrasonic signals are emitted to all directions around the space where the probe is positioned, or the ultrasonic signals from all directions are received, and the adjustable frequency ultrasonic probe is suitable for detecting and judging the internal defects of concrete structures with different distances and different sizes.
Drawings
Fig. 1 is a schematic structural diagram of an adjustable frequency ultrasonic probe according to an embodiment of the present invention.
Fig. 2 is a partial enlarged view of fig. 1.
Fig. 3 is a partial enlarged view of fig. 1.
Detailed Description
In order to make the technical scheme and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of an adjustable frequency ultrasonic probe according to an embodiment of the present invention.
As shown in fig. 1,2 and 3, the tunable ultrasonic probe in the embodiment of the present invention includes: a metal shell 11, an inner liner 12, a plurality of piezoelectric ceramic layers 13 and a plurality of spacer layers 14;
The metal shell 11 is internally provided with a containing cavity;
the inner liner 12 is disposed at the center of the accommodating cavity of the metal casing 11, and is used for counteracting and absorbing the ultrasonic signals generated in the inward direction when the piezoelectric ceramic layer vibrates, so as to prevent the ultrasonic signals from penetrating the inner liner and then being transmitted to the opposite side, thereby causing interference to the ultrasonic signals emitted by the piezoelectric ceramic layer to the outside;
A plurality of piezoelectric ceramic layers 13 are arranged between the outer wall of the inner liner 12 and the inner wall of the metal shell 11; an innermost piezoceramic layer covers the outer surface of the inner liner 12; the metal shell 11 covers the outer surface of the piezoelectric ceramic layer of the outermost layer; a spacing layer 14 is arranged between every two adjacent piezoelectric ceramic layers;
the outer wall of each piezoelectric ceramic layer 13 is a negative electrode, and the inner wall is a positive electrode; each piezoelectric ceramic layer 13 has a different resonance frequency;
the central wire outlet hole 15 is penetrated and arranged in the metal shell 11, each piezoelectric ceramic layer 13 and each spacing layer 14;
the inner wall of each piezoelectric ceramic layer 13 on one side of the central wire outlet hole 15 is provided with a positive electrode lug 21, and the outer wall of the other side of the central wire outlet hole 15 is provided with a negative electrode lug 23; the negative electrode lug of the piezoelectric ceramic layer at the outermost layer is connected with the inner wall of the metal shell 11;
The respective negative electrode tabs 23 are connected to each other by a negative electrode lead 24; each positive electrode lug 21 is connected with a positive electrode lead 22; each positive electrode lead 22 protrudes out of the metal casing through the center wire outlet hole 15.
In the above adjustable frequency ultrasonic probe, the positive electrodes of the piezoelectric ceramic layers are respectively connected with a positive electrode lead, and can form a bundle when assembled, extend out of the metal shell through the central wire outlet hole, and can be connected to the detection equipment through the multi-needle connector; the cathodes of the piezoelectric ceramic layers are connected to the cathode lug on the outer surface of the outermost piezoelectric ceramic layer through the same cathode lead, so that the cathodes are conducted with the inner surface of the metal shell. Because each piezoelectric ceramic layer has different resonant frequencies respectively, ultrasonic signals with different frequencies can be generated under the excitation of different voltages, when the adjustable frequency ultrasonic probe is used, the adjustable frequency ultrasonic probe can be pre-buried in the structure to be tested, then the instrument is used for controlling, and according to actual needs, one or more layers of piezoelectric ceramic layers are respectively excited, and all piezoelectric ceramic layers can be excited at the same time, so that one or more ultrasonic signals with different frequencies are generated, and the adjustable frequency ultrasonic probe is suitable for detecting and judging internal defects of concrete structures with different distances and different sizes.
In addition, as an example, in a preferred embodiment of the present invention, the outer and inner walls of the piezoelectric ceramic layer may be formed into the negative and positive electrodes, respectively, by silver plating and polarization methods.
Further, as an example, in a preferred embodiment of the present invention, the inner liner is spherical, and the metal casing, the plurality of piezoelectric ceramic layers, and the plurality of spacer layers are spherical shells.
In addition, in the technical scheme of the invention, the number of the piezoelectric ceramic layers and the spacing layers can be preset according to the requirements of practical application conditions.
For example, as shown in fig. 1, in a preferred embodiment of the present invention, the number of the piezoelectric ceramic layers is 4, and the number of the spacer layers is 3.
Further, as an example, in a preferred embodiment of the present invention, the piezoelectric ceramic layer is a spherical shell-shaped piezoelectric ceramic wafer.
Further, by way of example, in a preferred embodiment of the present invention, each piezoceramic layer comprises two hemispherical shells that are joined together at the top and bottom, respectively. For example, the two hemispheres may be joined together by a connector, or the two hemispheres may be bonded together by an adhesive.
In addition, as an example, in a preferred embodiment of the present invention, the jumper 25 having conductive properties may be provided on both the inner wall and the outer wall of the bottom joint of the two hemispheres, so that both the inner wall and the outer wall of the two hemispheres can be well connected.
Further, as an example, in a preferred embodiment of the invention, the jumper may be provided on the inner and outer walls of the bottom seam of the two hemispheres by means of gluing or welding.
In addition, as an example, in a preferred embodiment of the present invention, the jumper may be made of a material having good conductive properties such as copper.
Further, by way of example, in a preferred embodiment of the invention, the liner is pressed from a metal powder (e.g., tungsten powder) and an epoxy.
Further, by way of example, in a preferred embodiment of the present invention, the spacer layer is made of a metallic material (e.g., aluminum) whose surface is subjected to an insulating treatment (e.g., anodic oxidation).
Therefore, the metal material with the surface subjected to insulation treatment can be adopted between the piezoelectric ceramic layers to fill the space between the piezoelectric ceramic layers as a spacing layer, so that the space between the piezoelectric ceramic layers is completely filled, and the direct contact of the piezoelectric ceramic layers is prevented from influencing each other when the probe works. In addition, materials such as vaseline can be used for coupling the piezoelectric ceramic layer and the spacer layer during assembly, so that the situation of non-compactness such as gaps between the layers is prevented.
In addition, in the technical scheme of the invention, the metal shell at the outermost layer can protect the piezoelectric ceramic layer inside the probe from being damaged.
In summary, in the technical scheme of the present invention, the tunable ultrasonic probe adopts a multilayer cladding structure, and mainly includes: a metal shell, an inner liner, a plurality of piezoelectric ceramic layers and a plurality of spacing layers. Because each piezoelectric ceramic layer has different resonant frequencies, ultrasonic signals with different frequencies can be generated under the excitation of different voltages, when the adjustable frequency ultrasonic probe is used, the adjustable frequency ultrasonic probe can be controlled by an instrument, one or more piezoelectric ceramic layers can be excited according to actual needs, and all piezoelectric ceramic layers can be excited at the same time, so that one or more ultrasonic signals with different frequencies can be generated, the ultrasonic signals can be emitted to all directions around the space where the probe is positioned, or the ultrasonic signals from all directions can be received, and the adjustable frequency ultrasonic probe can be suitable for detecting and judging internal defects of concrete structures with different distances and different sizes.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (8)
1. A tunable ultrasonic probe, comprising: the piezoelectric ceramic composite material comprises a metal shell, an inner liner, a plurality of piezoelectric ceramic layers and a plurality of spacing layers;
the metal shell is internally provided with a containing cavity;
The inner lining is arranged at the center of the accommodating cavity of the metal shell and is used for counteracting and absorbing ultrasonic signals generated in the inner side direction when the piezoelectric ceramic layer vibrates;
A plurality of piezoelectric ceramic layers are arranged between the outer wall of the lining and the inner wall of the metal shell; the piezoelectric ceramic layer of the innermost layer covers the outer surface of the lining; the metal shell covers the outer surface of the piezoelectric ceramic layer of the outermost layer; a spacing layer is arranged between every two adjacent piezoelectric ceramic layers;
The outer wall of each piezoelectric ceramic layer is a negative electrode, and the inner wall is a positive electrode; each piezoelectric ceramic layer has a different resonant frequency;
the central wire outlet hole is arranged in the metal shell, each piezoelectric ceramic layer and each spacing layer in a penetrating way;
The inner wall of one side of each piezoelectric ceramic layer at the central wire outlet is provided with a positive electrode lug, and the outer wall of the other side of each piezoelectric ceramic layer at the central wire outlet is provided with a negative electrode lug; the negative electrode lug of the piezoelectric ceramic layer at the outermost layer is connected with the inner wall of the metal shell;
each negative electrode lug is connected with each other through a negative electrode lead; each positive electrode lug plate is connected with a positive electrode lead; each positive electrode lead forms a bundle, extends out of the metal shell through the central wire outlet hole and is connected to detection equipment through a multi-needle connector;
the lining is pressed by metal powder and epoxy resin;
The spacer layer is made of a metal material whose surface is subjected to an insulation treatment.
2. The tunable ultrasonic probe of claim 1, wherein:
the inner lining is spherical; the metal shell, the piezoelectric ceramic layers and the spacer layers are spherical shells.
3. The tunable ultrasonic probe of claim 1 or 2, wherein:
Each piezoelectric ceramic layer comprises two hemispherical shells which are respectively connected together at the top and the bottom.
4. A frequency-tunable ultrasonic probe according to claim 3, wherein:
the inner wall and the outer wall of the bottom joint of the two hemispheric shells are respectively provided with a jumper with electric conduction performance.
5. The tunable ultrasonic probe of claim 4, wherein:
the jumper sheet can be arranged on the inner wall and the outer wall of the bottom joint of the two hemispheric shells in an adhesive or welding mode.
6. The tunable ultrasonic probe of claim 4, wherein:
The jumper is made of copper.
7. The tunable ultrasonic probe of claim 2, wherein:
the piezoelectric ceramic layer is a spherical shell-shaped piezoelectric ceramic wafer.
8. The tunable ultrasonic probe of claim 1, wherein:
the number of the piezoelectric ceramic layers is 4, and the number of the spacing layers is 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910722822.3A CN110470734B (en) | 2019-08-06 | 2019-08-06 | Adjustable frequency ultrasonic probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910722822.3A CN110470734B (en) | 2019-08-06 | 2019-08-06 | Adjustable frequency ultrasonic probe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110470734A CN110470734A (en) | 2019-11-19 |
| CN110470734B true CN110470734B (en) | 2024-05-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910722822.3A Active CN110470734B (en) | 2019-08-06 | 2019-08-06 | Adjustable frequency ultrasonic probe |
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| Country | Link |
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| CN (1) | CN110470734B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112305074B (en) * | 2020-10-28 | 2023-05-23 | 济南大学 | Piezoelectric ultrasonic device for on-line monitoring of cement concrete hydration process |
| CN116984218A (en) * | 2023-08-08 | 2023-11-03 | 陕西师范大学 | Sandwich spherical ultrasonic transducer and method based on piezoelectric ceramic shell stack |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07136164A (en) * | 1993-11-12 | 1995-05-30 | Olympus Optical Co Ltd | Ultrasonic probe |
| KR20010110246A (en) * | 2001-11-05 | 2001-12-12 | 주식회사 이지메딕스 | A pile structure of ultrasonic probe |
| CN201974521U (en) * | 2010-12-22 | 2011-09-14 | 汉得利（常州）电子有限公司 | High-frequency and high-sensitivity ultrasonic sensor |
| CN103076610A (en) * | 2012-12-30 | 2013-05-01 | 常州波速传感器有限公司 | Ultrasonic transducer for automatically parking |
| CN103308259A (en) * | 2012-03-07 | 2013-09-18 | 哈尔滨盛仕瑞达科技发展有限公司 | Ultrasonic probe of laminated composite structure |
| CN104614066A (en) * | 2015-02-06 | 2015-05-13 | 杭州迪比声学技术有限公司 | Metal housing sealed type piezoelectric ceramic hydrophone |
| CN205228546U (en) * | 2015-12-02 | 2016-05-11 | 成都汇通西电电子有限公司 | Ultrasonic wave flow -meter probe |
| CN210775337U (en) * | 2019-08-06 | 2020-06-16 | 中冶建筑研究总院有限公司 | Frequency-adjustable ultrasonic probe |
-
2019
- 2019-08-06 CN CN201910722822.3A patent/CN110470734B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07136164A (en) * | 1993-11-12 | 1995-05-30 | Olympus Optical Co Ltd | Ultrasonic probe |
| KR20010110246A (en) * | 2001-11-05 | 2001-12-12 | 주식회사 이지메딕스 | A pile structure of ultrasonic probe |
| CN201974521U (en) * | 2010-12-22 | 2011-09-14 | 汉得利（常州）电子有限公司 | High-frequency and high-sensitivity ultrasonic sensor |
| CN103308259A (en) * | 2012-03-07 | 2013-09-18 | 哈尔滨盛仕瑞达科技发展有限公司 | Ultrasonic probe of laminated composite structure |
| CN103076610A (en) * | 2012-12-30 | 2013-05-01 | 常州波速传感器有限公司 | Ultrasonic transducer for automatically parking |
| CN104614066A (en) * | 2015-02-06 | 2015-05-13 | 杭州迪比声学技术有限公司 | Metal housing sealed type piezoelectric ceramic hydrophone |
| CN205228546U (en) * | 2015-12-02 | 2016-05-11 | 成都汇通西电电子有限公司 | Ultrasonic wave flow -meter probe |
| CN210775337U (en) * | 2019-08-06 | 2020-06-16 | 中冶建筑研究总院有限公司 | Frequency-adjustable ultrasonic probe |
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| CN110470734A (en) | 2019-11-19 |
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