CN102346172A - Back lining material for ultrasonic non-destructive detector probe and manufacture method thereof - Google Patents
Back lining material for ultrasonic non-destructive detector probe and manufacture method thereof Download PDFInfo
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- CN102346172A CN102346172A CN2010102416757A CN201010241675A CN102346172A CN 102346172 A CN102346172 A CN 102346172A CN 2010102416757 A CN2010102416757 A CN 2010102416757A CN 201010241675 A CN201010241675 A CN 201010241675A CN 102346172 A CN102346172 A CN 102346172A
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Abstract
The invention provides a back lining material for an ultrasonic non-destructive detector probe, which is formed by the steps of: evenly mixing tungsten powder, lead powder, composite material tungsten powder with epoxy adhesive; and forming the back lining material by extrusion moulding in an extruding way under the pressure of 30-45MPa. A manufacture method of the back lining material comprises the steps of: (a) mixing epoxy resin E-54, polysulfide rubber with triethanolamine in a stirring way, wherein the three substances account for 1% of the total mass of the back lining material; (b) adding the tungsten powder of which mass to the total mass of the back lining material is 27.83%, the lead podwer of which mass to the total mass of the back lining material is 4.13% and the composite material tungsten powder of which mass to the total mass of the back lining material is 1.03% into the mixture in the step (a), and mixing in a stirring way; (c) adding the tungsten powder of which mass to the total mass of the back lining material is 55.67%, the lead podwer of which mass to the total mass of the back lining material is 8.27% and the composite material tungsten powder of which mass to the total mass of the back lining material is 2.07% into the mixture, and mixing in a grinding way; (d) filling composite particulates into a mould, and extruding the composite particulates into the required back lining material by a powder tablet press; and (e) heating and solidifying the pressed back lining material. The specific acoustic impedance of the back lining material is improved at 23*106 Pa.s/m, and the acoustic attenuation coefficient is improved at 95dB/cm under the condition of 5MHz, so that the probe made from the back lining material has the characteristics that the probe is short in pulse, wide in frequency band, high in resolution ratio, free of the generation of backward noise wave.
Description
Technical field
The present invention relates to a kind of back lining materials and manufacturing approach thereof that is used for the calm damage detection probe of ultrasound wave.
Background technology
At present the method for making of back lining materials generally all is to be mixed by the epoxy resin and the tungsten powder of liquid state earlier, be heating and curing then to form, but the acoustic impedance of the produced back lining materials of this method is 10 * 10
6About Pa.s/m, and the PZT commonly used or the wafer acoustic impedance of PT material are: 28-31 * 10
6Pa.s/m will reach the wafer acoustic impedance according to the acoustic impedance of back lining materials
Requirement, the manufacture craft of present back lining materials does not satisfy the coupling between back lining materials and the wafer.Formula according to the specific acoustic impedance of material: Z=ρ c, the specific acoustic impedance that can see material is the product of the velocity of sound of density and the material of material, in order to increase the specific acoustic impedance of back lining materials, improves the density of back lining materials, becomes people's research focus.People such as M.G.Grewe show in the research of 1900 the 37 volume 506-513 of " IEEE Transactions on Ultrasonic ferrocelectrics and frequency control ": in tungsten powder/epoxy systems; When the percent by volume of tungsten powder rose to 31.9% by 4.7%, the specific acoustic impedance of back lining materials was by 4.7 * 10
6Pa.s/m has been raised to 10.8 * 10
6Pa.s/m, but this moment, back lining materials also dropped to 42 ± 5dB/cm by 69 ± 12dB/cm at the 5MHZ acoustic attenuation coefficient.
In order to increase the mass percent/percent by volume of tungsten powder in tungsten powder/epoxy systems; Merely add the method for tungsten powder in the epoxy systems; Obviously be impracticable; Because when the percent by volume of tungsten powder reaches 31.9%; Liquid epoxy systems is unusual thickness; Continue to improve the content of tungsten powder; The system that will make is difficult to even mixing; Therefore, the method that relies in the epoxy systems mass percent/percent by volume of increase tungsten powder to improve the specific acoustic impedance of back lining materials is impracticable.In order to produce a higher acoustic impedance of the backing material, Teng Yongping in the "Applied Acoustics" (1995 Volume 14, sixth 37-39) on an article "narrow pulse ultrasonic probe for detecting high-impedance backing Development "proposes a" squeeze method ", the method is: first
tungsten powder into the container at the bottom, and then join
tungsten powder with an epoxy mixture, and finally add the remaining
tungsten powder.Evenly exert pressure then, make tungsten powder pile up closely, also unnecessary epoxy is squeezed out simultaneously, the back lining materials specific acoustic impedance of making like this can be up to 25.1 * 10
6Pa.s/m, but the weak point of this method is: 1, the acoustic attenuation coefficient of back lining materials is very little, has only 13-21dB/cm, does not satisfy the acoustic attenuation requirement of back lining materials; 2, institute's applied pressure is big inadequately, and it is tightly packed to make that tungsten powder further pushes; 3, cannot guarantee that epoxy is dispersed in tungsten powder/epoxy systems.In addition, the Chinese Patent Publication No. CN1605863A, Publication date April 13, 2005, the name of inventions as "a loss for ultrasonic wave detection probe without backing material and its manufacturing method," which application discloses a use making a deposition rate and the acoustic impedance of the acoustic attenuation coefficient backing material, the method is: the soft particles of the thermoplastic resin dissolved in an organic solvent, then adding tungsten powder mixed, and then the solvent was evaporated, finally by hot the method of forming a backing material made of such backing materials made of acoustic impedance ratio can reach 18.1 × 10
6 Pa.s / m, the attenuation coefficient in 5MHZ as 105.1dB/cm.Weak point is: 1, and manufacture craft is comparatively loaded down with trivial details, and the time is long, not too utilizes suitability for industrialized production; 2, owing to use volatile organic solvent, pollute easily and unnecessary waste.
Summary of the invention
The present invention has overcome because the mass percent of tungsten powder in tungsten powder/epoxy systems is not high; The low acoustic impedance rate of bringing; The shortcoming of low acoustic attenuation provides a kind of hydrostatic profile making to have the acoustic impedance rate and high acoustic attenuation coefficient is applied to back lining materials and the manufacturing approach thereof that Ultrasonic Nondestructive is popped one's head in.Through the collocation of tungsten powder and lead powder, added the compound substance tungsten powder simultaneously, improved the specific acoustic impedance and the acoustic attenuation coefficient of back lining materials; Make the probe of processing by this back lining materials have the pulse weak point; Bandwidth, the characteristics that resolution is high, and do not have the generation of clutter dorsad.It is simple that the present invention also has manufacture craft, and the time is short, is beneficial to the characteristics of suitability for industrialized production, and this method for making do not pollute environment, also do not produce unnecessary waste.
The present invention realizes through following technical scheme; A kind of back lining materials that is used for the Ultrasonic Nondestructive probe; Evenly mix by tungsten powder, lead powder, compound substance tungsten powder and epoxy adhesive; Extrusion molding under the pressure of 30-45MPa; It is characterized in that said compound substance tungsten powder is by rubber and tungsten powder is mixing forms.
2 back lining materials according to claim 1 is characterized in that the specific acoustic impedance of above-mentioned back lining materials is: 23 * 10
6-18 * 10
6Pa.s/m; The mass percent that tungsten powder accounts for back lining materials is: 80-88%; The mass percent that lead powder accounts for back lining materials is: 10-14%; The mass percent that the compound substance tungsten powder accounts for back lining materials is: 1-5; The acoustic attenuation coefficient 95-82dB/cm of back lining materials when 5MHz.
3 back lining materials according to claim 1 and 2, the specific acoustic impedance that it is characterized in that above-mentioned back lining materials is 18.6 * 10
6Pa.s/m; The best in quality number percent that tungsten powder accounts for back lining materials is: 83.5%; The best in quality number percent that lead powder accounts for back lining materials is: 12.4%; The best in quality number percent that the compound substance tungsten powder accounts for back lining materials is: 3.1%; The optimum pressure of back lining materials extrusion molding is: 40MP, its acoustic attenuation coefficient when 5MHz is 92dB/cm.
Make the method for the back lining materials of ultrasound examination probe of the present invention, may further comprise the steps:
(a) epoxy resin E-54, thiokol and triethanolamine are mixed, process the essential epoxy adhesive of compacting back lining materials, wherein the gross mass of epoxy resin E-54, thiokol and triethanolamine accounts for 1% of back lining materials gross mass
(b) will account for 27.83% tungsten powder of back lining materials gross mass, 4.13% the lead powder that accounts for the back lining materials gross mass adds in the above-mentioned epoxy adhesive with the compound substance tungsten powder that accounts for back lining materials gross mass 1.03%, mixes.
(c) will account for 55.67% tungsten powder of back lining materials gross mass; Account for 8.27% lead powder of back lining materials gross mass; The compound substance tungsten powder that accounts for back lining materials gross mass 2.07% adds in the said mixture; Ground and mixed; Thereby make tackifier fully mix, process the essential composite particles of compacting back lining materials with powder.
(d) composite particles is packed in the mould, utilize powder compressing machine that it is squeezed into required back lining materials, wherein the pressure of extrusion molding is 40MPa.
(e) back lining materials that suppresses being put into furnace temperature is in 65 ℃ the air blast heating oven, to be heating and curing.
Compared with prior art, advantage of the present invention is: 1, through stirring and grinding, can guarantee that epoxy resin is well dispersed in the middle of the whole system; 2, the adding of lead powder and compound substance tungsten powder has improved the acoustic attenuation coefficient of back lining materials, has also reduced production cost simultaneously; 3, the high pressure of 40MPa, guaranteed powder in the system tightly packed degree and back lining materials be molded into power; 4, significantly reduced the consumption of resin, improved the mass percent of powder in system effectively; 5, manufacture craft is simple, and is quick, helps industrialized production, and can not cause waste and environmental pollution; 6, the probe of processing with this back lining materials has the pulse weak point, bandwidth, and the characteristics that resolution is high, and do not have the characteristics of clutter generation dorsad.
Description of drawings
Fig. 1 is the structural drawing of the probe processed with back lining materials of the present invention
Fig. 2 a is the pulse and the spectrogram of the probe processed with the prior art back lining materials
Fig. 2 b is the pulse and the spectrogram of the probe processed with back lining materials of the present invention
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is explained in detail.
The back lining materials that is used for the Ultrasonic Nondestructive probe of the present invention; Form by tungsten powder, lead powder, compound substance tungsten powder and epoxy glue tackifier; And under the pressure of 30-45MPa extrusion molding, the mass percent that wherein said tungsten powder accounts for back lining materials is: 80-88%; The mass percent that lead powder accounts for back lining materials is: the mass percent that 10-14%, compound substance tungsten powder account for back lining materials is: 1-5%.Wherein massfraction calculates by following formula
The specific acoustic impedance of above-mentioned back lining materials is 23 * 10
6-18.6 * 10
6Pa.s/m, the acoustic attenuation coefficient when 5MHz are 95-82dB/cm.
The best in quality number percent that wherein above-mentioned tungsten powder accounts for back lining materials is: 83.5%; The best in quality number percent that lead powder accounts for back lining materials is: 12.4%; The best in quality number percent that the compound substance tungsten powder accounts for back lining materials is: 3.1%; The optimum pressure of back lining materials extrusion molding is: during 40MPa, the specific acoustic impedance of described back lining materials is 18.6 * 10
6Pa.s/m, its acoustic attenuation coefficient when 5MHz is 92dB/cm.
Wherein above-mentioned epoxy adhesive is mixed by epoxy resin E-54, thiokol and triethanolamine and makes; The compound substance tungsten powder is by rubber and tungsten powder is mixing forms; The optimum pressure of back lining materials extrusion molding is: 40MPa.
Make the method for the back lining materials of ultrasound examination probe of the present invention, may further comprise the steps:
(a) epoxy resin E-54, thiokol and triethanolamine are mixed, process the essential epoxy adhesive of compacting back lining materials, wherein the gross mass of epoxy resin E-54, thiokol and triethanolamine accounts for 1% of back lining materials gross mass
(b) will account for 27.83% tungsten powder of back lining materials gross mass, 4.13% the lead powder that accounts for the back lining materials gross mass adds in the above-mentioned epoxy adhesive with the compound substance tungsten powder that accounts for back lining materials gross mass 1.03%, mixes.
(c) will account for 55.67% tungsten powder of back lining materials gross mass; Account for 8.27% lead powder of back lining materials gross mass; The compound substance tungsten powder that accounts for back lining materials gross mass 2.07% adds in the said mixture; Ground and mixed; Thereby make tackifier fully mix, process the essential composite particles of compacting back lining materials with powder.
(d) composite particles is packed in the mould, utilize powder compressing machine that it is squeezed into required back lining materials, wherein the pressure of extrusion molding is 40MPa.
(e) back lining materials that suppresses being put into furnace temperature is in 65 ℃ the air blast heating oven, to be heating and curing.
Describe the specific embodiment of the present invention in detail below in conjunction with instance.
Embodiment 1
The back lining materials that is used for Ultrasonic Nondestructive probe of the present invention is made up of tungsten powder, lead powder, compound substance tungsten powder and epoxy adhesive, and under the pressure of 30MPa extrusion molding.
The mass percent that wherein said tungsten powder accounts for back lining materials is: 80%, and the granularity that tungsten powder adopts Zhuzhou hard metal factory to produce is the tungsten powder of 4um, density is 19.1g/cm
3The mass percent that lead powder accounts for back lining materials is: 14%, and it is 200 purpose lead powder that lead powder adopts the granularity of Shanghai Ke Feng chemical reagent company limited, density is 9.1g/cm
3, the mass percent that the compound substance tungsten powder accounts for back lining materials is: 5%, and be by rubber and tungsten powder is mixing forms, grain graininess is 0.5mm.
Epoxy adhesive is mixed by epoxy resin E-54, thiokol and triethanolamine and makes, and wherein thiokol adopts Changsha chemical institute, triethanolamine to adopt Guangzhou Chemical Reagent Factory.
It is as shown in table 1 to fill a prescription:
Table 1 back lining materials prescription
Table 1 is the prescription of back lining materials.The making step of described back lining materials is following: 1 epoxy resin E-54, the thiokol of 0.1g and the triethanolamine of 0.05g that in the impregnation jar, adds 0.35g, stir more than three minutes, until stirring; 2.The 4um tungsten powder that adds 11.13g in the impregnation jar, the lead powder of 2.89g, the compound substance tungsten powder of 0.258g stirred one minute; 3, with remaining tungsten powder, lead powder, the compound substance tungsten powder adds in the potpourri of gained in the step 2, and ground and mixed makes tackifier fully mix with powder then; 4, composite particles is packed in the mould, utilize powder compressing machine that it is squeezed into required back lining materials, wherein the pressure of extrusion molding is 30MPa; 5, putting the back lining materials that suppresses into furnace temperature is that be heating and curing (12 hours) just can obtain needed back lining materials in 65 ℃ the air blast heating oven.Prepared back lining materials is carried out the acoustical behavior test, shown in result such as the table 2, table 3:
The acoustical behavior of table 2 back lining materials
Embodiment 2
The back lining materials that is used for Ultrasonic Nondestructive probe of the present invention is made up of tungsten powder, lead powder, compound substance tungsten powder and epoxy adhesive, and under the pressure of 45MPa extrusion molding.
The mass percent that wherein said tungsten powder accounts for back lining materials is: 88%, and the granularity that tungsten powder adopts Zhuzhou hard metal factory to produce is the tungsten powder of 4um, density is 19.1g/cm
3The mass percent that lead powder accounts for back lining materials is: 10%, and it is 200 purpose lead powder that lead powder adopts the granularity of Shanghai Ke Feng chemical reagent company limited, density is 9.1g/cm
3, the mass percent that the compound substance tungsten powder accounts for back lining materials is: 1%, and be by rubber and tungsten powder is mixing forms, grain graininess is 0.5mm.
Epoxy adhesive is mixed by epoxy resin E-54, thiokol and triethanolamine and makes, and wherein thiokol adopts Changsha chemical institute, triethanolamine to adopt Guangzhou Chemical Reagent Factory.
It is as shown in table 3 to fill a prescription:
Table 3 back lining materials prescription
Table 3 is the prescription of back lining materials.The making step of described back lining materials is following: 1 epoxy resin E-54, the thiokol of 0.1g and the triethanolamine of 0.05g that in the impregnation jar, adds 0.35g, stir more than three minutes, until stirring; 2.The 4um tungsten powder that adds 12.24g in the impregnation jar, the lead powder of 0.21g, the compound substance tungsten powder of 0.05g stirred one minute; 3, with remaining tungsten powder, lead powder, the compound substance tungsten powder adds in the potpourri of gained in the step 2, and ground and mixed makes tackifier fully mix with powder then; 4, composite particles is packed in the mould, utilize powder compressing machine that it is squeezed into required back lining materials, wherein the pressure of extrusion molding is 45MPa; 5, putting the back lining materials that suppresses into furnace temperature is that be heating and curing (12 hours) just can obtain needed back lining materials in 65 ℃ the air blast heating oven.Prepared back lining materials is carried out the acoustical behavior test, and the result is as shown in table 4:
The acoustical behavior of table 4 back lining materials
Embodiment 3
The back lining materials that is used for Ultrasonic Nondestructive probe of the present invention is made up of tungsten powder, lead powder, compound substance tungsten powder and epoxy adhesive, and under the pressure of 40MPa extrusion molding.
The mass percent that wherein said tungsten powder accounts for back lining materials is: 83.5%, and the granularity that tungsten powder adopts Zhuzhou hard metal factory to produce is the tungsten powder of 4um, density is 19.1g/cm
3The mass percent that lead powder accounts for back lining materials is: 12.4%, and it is 200 purpose lead powder that lead powder adopts the granularity of Shanghai Ke Feng chemical reagent company limited, density is 9.1g/cm
3, the mass percent that the compound substance tungsten powder accounts for back lining materials is: 3.1%, and be by rubber and tungsten powder is mixing forms, grain graininess is 0.5mm.
Epoxy adhesive is mixed by epoxy resin E-54, thiokol and triethanolamine and makes, and wherein thiokol adopts Changsha chemical institute, triethanolamine to adopt Guangzhou Chemical Reagent Factory.
It is as shown in table 5 to fill a prescription:
Table 5 back lining materials prescription
Table 5 is the prescription of back lining materials.The making step of described back lining materials is following: 1 epoxy resin E-54, the thiokol of 0.1g and the triethanolamine of 0.05g that in the impregnation jar, adds 0.35g, stir more than three minutes, until stirring; 2.The 4um tungsten powder that adds 11.62g in the impregnation jar, the lead powder of 0.26g, the compound substance tungsten powder of 0.16g stirred one minute; 3, with remaining tungsten powder, lead powder, the compound substance tungsten powder adds in the potpourri of gained in the step 2, and ground and mixed makes tackifier fully mix with powder then; 4, composite particles is packed in the mould, utilize powder compressing machine that it is squeezed into required back lining materials, wherein the pressure of extrusion molding is 40MPa; 5, putting the back lining materials that suppresses into furnace temperature is that be heating and curing (12 hours) just can obtain needed back lining materials in 65 ℃ the air blast heating oven.Prepared back lining materials is carried out the acoustical behavior test, and the result is as shown in table 6:
The acoustical behavior of table 6 back lining materials
Visible by table 6, the specific acoustic impedance of back lining materials is 18.6 * 10
6Pa.s/m, its acoustic attenuation coefficient when 5MHz is 92dB/cm, its combination property is optimum, so from manufacture craft, the acoustical behavior of back lining materials is used to wait and considered that this enforcement is optimum implementation of the present invention.
Table 7 compares for the performance parameter of the probe that the backing of back lining materials of the present invention and prior art is processed; Fig. 1 is the structural drawing of the probe processed with back lining materials of the present invention, the pulse and the frequency spectrum comparison diagram of the probe that probe that Fig. 2 processes for the prior art back lining materials and back lining materials of the present invention are processed.Can see that from table 6 specific acoustic impedance of back lining materials is 18.6 * 10
6Pa.s/m, the acoustic attenuation coefficient when 5MHz are 92dB/cm, from table 7 and Fig. 2, can see that the frequency spectrum of the probe B of being processed by the present invention is wideer, and pulse is shorter
The performance parameter of the probe that the backing of table 7 back lining materials of the present invention and prior art is processed relatively
Claims (5)
1. one kind is used for the back lining materials that Ultrasonic Nondestructive is popped one's head in; Evenly mix by tungsten powder, lead powder, compound substance tungsten powder and epoxy adhesive; Extrusion molding under the pressure of 30-45MPa is characterized in that, said compound substance tungsten powder is by rubber and tungsten powder is mixing forms.
2. back lining materials according to claim 1 is characterized in that the specific acoustic impedance of above-mentioned back lining materials is: 23 * 10
6-18 * 10
6Pa.s/m; The mass percent that tungsten powder accounts for back lining materials is: 80-88%; The mass percent that lead powder accounts for back lining materials is: 10-14%; The mass percent that the compound substance tungsten powder accounts for back lining materials is: 1-5; The acoustic attenuation coefficient 95-82dB/cm of back lining materials when 5MHz.
3. back lining materials according to claim 1 and 2, the specific acoustic impedance that it is characterized in that above-mentioned back lining materials is 18.6 * 10
6Pa.s/m; The best in quality number percent that tungsten powder accounts for back lining materials is: 83.5%; The best in quality number percent that lead powder accounts for back lining materials is: 12.4%; The best in quality number percent that the compound substance tungsten powder accounts for back lining materials is: 3.1%; The optimum pressure of back lining materials extrusion molding is: 40MP, its acoustic attenuation coefficient when 5MHz is 92dB/cm.
4. back lining materials according to claim 1 is characterized in that above-mentioned epoxy adhesive is mixed by epoxy resin E-54, thiokol and triethanolamine to make.
5. make the method that is used for the back lining materials of ultrasonic inspection probe as claimed in claim 1 for one kind, may further comprise the steps:
(a) epoxy resin E-54, thiokol and triethanolamine are mixed, process the essential epoxy adhesive of compacting back lining materials, wherein the gross mass of epoxy resin E-54, thiokol and triethanolamine accounts for 1% of back lining materials gross mass
(b) will account for 27.83% tungsten powder of back lining materials gross mass, 4.13% the lead powder that accounts for the back lining materials gross mass adds in the above-mentioned epoxy adhesive with the compound substance tungsten powder that accounts for back lining materials gross mass 1.03%, mixes.
(c) will account for 55.67% tungsten powder of back lining materials gross mass; Account for 8.27% lead powder of back lining materials gross mass; The compound substance tungsten powder that accounts for back lining materials gross mass 2.07% adds in the said mixture; Ground and mixed; Thereby make tackifier fully mix, process the essential composite particles of compacting back lining materials with powder.
(d) composite particles is packed in the mould, utilize powder compressing machine that it is squeezed into required back lining materials, wherein the pressure of extrusion molding is 40MPa.
(e) back lining materials that suppresses being put into furnace temperature is in 65 ℃ the air blast heating oven, to be heating and curing.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830181A (en) * | 2012-08-09 | 2012-12-19 | 江苏三合声源超声波科技有限公司 | Stress detection apparatus for ultrasonic probe |
| CN103995059A (en) * | 2014-05-30 | 2014-08-20 | 北京理工大学 | Acoustic surface wave flexible comb-shaped transducer applicable to curved surface detection |
| CN106483200A (en) * | 2015-08-31 | 2017-03-08 | 中国科学院声学研究所 | A kind of it is applied to sound absorption back lining materials of ultrasonic probe and preparation method thereof |
| CN109535650A (en) * | 2018-10-16 | 2019-03-29 | 徐致伟 | Ultrasonic transducer resin base acoustic matching layer and production method with impedance gradient |
| CN113416022A (en) * | 2021-06-30 | 2021-09-21 | 西安中核核仪器有限公司 | Gamma detector energy response compensation material and use method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830181A (en) * | 2012-08-09 | 2012-12-19 | 江苏三合声源超声波科技有限公司 | Stress detection apparatus for ultrasonic probe |
| CN103995059A (en) * | 2014-05-30 | 2014-08-20 | 北京理工大学 | Acoustic surface wave flexible comb-shaped transducer applicable to curved surface detection |
| CN106483200A (en) * | 2015-08-31 | 2017-03-08 | 中国科学院声学研究所 | A kind of it is applied to sound absorption back lining materials of ultrasonic probe and preparation method thereof |
| CN106483200B (en) * | 2015-08-31 | 2019-09-24 | 中国科学院声学研究所 | A kind of sound absorption back lining materials and preparation method thereof applied to ultrasonic probe |
| CN109535650A (en) * | 2018-10-16 | 2019-03-29 | 徐致伟 | Ultrasonic transducer resin base acoustic matching layer and production method with impedance gradient |
| CN109535650B (en) * | 2018-10-16 | 2021-02-26 | 扬州润友复合材料有限公司 | Resin-based acoustic matching layer with impedance gradient for ultrasonic transducer and manufacturing method thereof |
| CN113416022A (en) * | 2021-06-30 | 2021-09-21 | 西安中核核仪器有限公司 | Gamma detector energy response compensation material and use method thereof |
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Application publication date: 20120208 |