CN107228903A - A kind of hydrophone linear array detected for concrete dam and preparation method thereof - Google Patents
A kind of hydrophone linear array detected for concrete dam and preparation method thereof Download PDFInfo
- Publication number
- CN107228903A CN107228903A CN201610169700.2A CN201610169700A CN107228903A CN 107228903 A CN107228903 A CN 107228903A CN 201610169700 A CN201610169700 A CN 201610169700A CN 107228903 A CN107228903 A CN 107228903A
- Authority
- CN
- China
- Prior art keywords
- hydrophone
- linear array
- unit
- preamplifier
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2437—Piezoelectric probes
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention provides a kind of hydrophone linear array detected for concrete dam, including：Several hydrophone units (10), multicore cable (5) and connector (11)；The signal input part and signal output part of each hydrophone unit (10) are all connected with a multicore cable (5)；Each multicore cable (5) is equipped with aviation plug sockets (9) in one end away from connected hydrophone unit (10)；Each nook closing member that described aviation plug sockets (9) one end is provided with is corresponding with each cored wire in multicore cable (5) to be welded together, and aviation plug sockets (9) other end passes through connector (11) and connects another aviation plug sockets (9) adjacent thereto.The hydrophone linear array is assembled into linear array using modular mode, and has the advantages that the sensitivity for receiving signal is high, measurement efficiency is high, property easy to use is good, is very suitable for the measurement of the sound tomography of concrete dam.
Description
Technical field
The present invention relates to concrete dam field of detecting, and in particular to a kind of hydrophone detected for concrete dam
Linear array and preparation method thereof.
Background technology
With flourishing for China's economic undertakings, the infrastructure of large-sized concrete structure is in water resources dam work
Have been obtained for being widely applied in the heavy constructions such as journey, sea port dock, nuclear power station, large-sized concrete structure is being applied
During work and use, due to being influenceed by its own and extraneous various factors, some defects can be usually produced, from
And the bearing capacity and durability to works cause to have a strong impact on.And the quality of these large-sized concrete Structural Engineerings
The safety of the country and people's property is directly connected to, therefore, carries out safe and stable property to it and assesses with predicting, with
And health monitoring diagnosis tool is of great significance.
Concrete dam is exactly typical large volume concrete structural, is acted on because it is main in hydrostatic and circulating water
Under the conditions of work, therefore also referred to as Hydro-concrete Structures or large volume concrete structural.Using Non-Destructive Testing skill
Art carries out quality testing and Gernral Check-up to large volume concrete structural, and this is for formulating and selecting at rational reinforcing
Reason scheme, carrying out safe and stable property assessment and the research of disease Control of Hidden for concrete structure has important meaning
Justice.
Sonic detection large volume concrete structural is a kind of relatively inexpensive, easy, effective lossless detection method.Sound
Ripple non-destructive testing technology general principle is the bullet that method manually inspires certain frequency in measured material or structure
Property ripple, then propagated with a variety of frequencies in material or inside configuration, because sound wave is propagated (transmit) wherein
A series of acoustic phenomenons such as stronger Shi Huiyou reflection, scattering, absorption and wave distortion.To different material conditions,
The characteristics of its acoustic phenomenon has different.Concrete is actually a kind of clustered composite, is multiphase complex
System.The quantity and spatial distribution that the defect of inside concrete, aggregate and cement mortar constitute acoustic interface be it is random,
Multifarious, therefore, propagation state of the sound wave in concrete is complicated more than the propagation in uniform dielectric.
Acoustical signal, can be by the material character of inside concrete, defect, knot as the carrier of inside concrete characteristic information
The information transmissions such as structure are into the reception signal to be extracted, it is possible thereby to be used as the basis for estimation of concrete quality.Especially
It is, by sonic tomography technology, from appropriate mathematical modeling and reestablishment imaging technology, can be finally inversed by mixed
Solidifying internal certain unknown physical quantity of soil, and the quality that two dimension, 3-D view intuitively reflect inside concrete is generated, it is right
Defect carries out qualitative and quantitative analysis, reaches the purpose for improving and reliably detecting.Especially for the perils detecting of dam,
Tomography is detected can detect the hidden danger of deep part inside dam quick nondestructive, such as dam concrete aging area,
Embankment seepage, dam site geological structure and fracture belt etc. are checked that therefore, dam chromatography imaging technique is ground in recent years
Study carefully work to be increasingly taken seriously.
Sonic tomography is substantially the information that is superimposed from low dimensional manifold to differentiate and extract the information on a little, easily
In the intensity, the position of internal flaw and the size that directly promptly determine concrete, it can also judge what is wrecked
Degree etc..With the features such as cost is low, speed is fast, applied widely, system architecture is simple, security is good, this
It is difficult to accomplish with damaged proved recipe method.Additionally due to acoustic velocity parameter and concrete strength are directly related, with showing
Row concrete quality control of acceptance is tightly combined, therefore, is had for the Dam Safety Detection of Hydro-concrete Structures
Important researching value.
Hydrophone is the reception device of tomography signal.Need solution during sonic detection concrete is to receive to pass through
Sound wave after concrete propagation, while the various parameters,acoustics in order to measure sound wave, in addition it is also necessary to which acoustic energy is converted into
The electrical quantities surveyed are easier, and realize that the device for changing acoustic energy to electric energy is exactly hydrophone.It is used as sonic detection
Important component hydrophone, can correctly pick up the topmost problem of waveform depending on amplitude versus frequency characte and Bob first,
This is directly connected to the quality of data, operating efficiency and acquisition cost.In the detection operations of the long ranging of dam concrete,
Need using emission sources such as electric spark, electric caps, if only connect using single hydrophone at one in tomography
Sink carries out signal reception, and then multiple shift position receives other signals again, then both time-consuming or very uneconomical,
Number of times is excited in order to reduce vibration source, and then improves efficiency of construction and cost-effective, preferable method is once to swash
In hair, using the hydrophone linear array of the acoustic signals for the multiple test points that can receive different depth simultaneously.But,
The technical problem that existing hydrophone linear array is present is that the sensitivity of the reception signal after transmitting over long distances is not high enough, shadow
The imaging effect and resolution ratio of tomography are rung, and then has influence on the precision of dam detection.Therefore, with multichannel,
The key that amplitude is high first, the highly sensitive hydrophone linear array of the clear characteristic of take-off is dam concrete acoustic imaging,
It is to realize the premise place for accurately determining dam concrete inner case.In addition, existing hydrophone linear array is also deposited
The low technical problem of reliability, the cascade that hydrophone linear array is used, by encapsulating are brought in full series model
After be an entirety, if, it is necessary to which all units of a whole set of linear array break one by one when occurring signal breakpoint during use
Open, carry out after investigating one by one, then replace problematic unit, could encapsulate again integral, any one is small to ask
The appearance of topic, it is necessary to just give me change, must waste time and energy very much；Therefore in its manufacturing process, in linear array
When any one unit is repaired after going wrong, the determination of question unit and the reparation again of linear array are all excessively
It is cumbersome；The particularly scene of operation in the wild, once going wrong, hydrophone linear array can not be carried out in operation field
Repair, which results in the test job of field work interruption, bring the huge expenditure of manpower and cost.Separately
Outer one side, due to being series winding form, the line of each array element is uniqueness, each other without alternative,
Be difficult to back up in advance which results in array element, the array element gone wrong, it is necessary to interim investigation could make after determining,
Cause the time cycle to lengthen, thus cause operating efficiency low in the extreme.Therefore, the reliable of hydrophone linear array is improved
Property and the convenience of maintenance be that hydrophone linear array is applied to concrete dam acoustic imaging application problem urgently to be resolved hurrily.
The content of the invention
It is an object of the present invention to exist that sensitivity is not enough, reliability is low to solve existing hydrophone linear array,
The technical problem of maintenance difficult, the invention provides a kind of highly sensitive hydrophone detected for concrete dam
Linear array, the hydrophone linear array is assembled into linear array using modular mode, and with the sensitivity that receives signal it is high,
The advantage that measurement efficiency is high, property easy to use is good, is very suitable for the measurement of the sound tomography of concrete dam.
To achieve the above object, a kind of hydrophone linear array detected for concrete dam that the present invention is provided, including：
Several hydrophone unit, multicore cable and connectors；Some cored wires are set in described multicore cable, each
The signal input part and signal output part of hydrophone unit are all connected with a multicore cable, and select different cored wires to make
The independent pathway transmitted for each hydrophone cell signal；Each multicore cable is away from connected hydrophone list
One end of member is equipped with aviation plug sockets；In each nook closing member and multicore cable that described aviation plug sockets one end is provided with
Each cored wire correspondence weld together, the aviation plug sockets other end connects adjacent thereto another by connector
Individual aviation plug sockets so that the signal input part of each hydrophone unit another hydrophone unit adjacent thereto
Signal output part is docked.Above-mentioned hydrophone linear array is made up of modular hydrophone unit, is led between hydrophone unit
Cross aviation plug sockets and can easily carry out series winding with connector and connect.Linear array, Yi Jifang can rapidly be constituted
Just dismantle and overhauled.
As the further improvement of above-mentioned technical proposal, described hydrophone unit includes：Piezoelectric element and shell；
Described piezoelectric element uses the piezoelectric circular that ceramic material is made, and the piezoelectric element is sealed in shell；It is described outer
The two ends of shell are equipped with a through hole, for by multicore cable penetrate after shell with piezoelectric circular realize electrically connect.It is above-mentioned
Hydrophone unit, as sensor, can select piezoceramic material or pressure using the piezoelectric of high piezoelectric constant
Electric monocrystal material.It is required that selecting the high piezoelectric element of uniformity, electric capacity and piezoelectric property d can control33Dispersion exist
± 3%.In addition, to improve resistance to hydrostatic pressure, the piezoelectric circular that piezoelectric element is tried one's best using heavy wall, to meet big depth
Lower the faced high static pressure of degree measurement.
As the further improvement of above-mentioned technical proposal, described hydrophone unit also includes：Preamplifier and set
It is equipped with the flexible PCB of multichannel；The quantity of the hydrophone unit is not more than 30；When hydrophone linear array is included
During not more than 12 hydrophone units, described multicore cable is the 1 in 16 core cables, the flexible PCB
To one end corresponding connection, the 16 core cable the 1st one by one of 16 passages respectively with the cored wire of 16 core cable the 1st to 16
To 15 cored wires the other end respectively with the corresponding connection one by one of the 1st to 15 nook closing member of aviation plug sockets, 16 core electricity
The cored wire other end of cable the 16th is connected with the hydrophone element number identical nook closing member where it, the piezoelectric circular it is interior,
Outer wall is corresponded to respectively draws positive and negative output line, and by its positive and negative signal input part one with preamplifier
One correspondence connection, the negative signal output end and positive signal output end of the preamplifier respectively with flexible PCB
13rd is connected with 16 passages, the power positive end and power supply negative terminal of the preamplifier respectively with flexible PCB
14 are connected with 15 passages.
As the further improvement of above-mentioned technical proposal, described shell includes：Two pieces of metal ends, metal column and
Polyurethane rubber；Described metal column is sheathed in piezoelectric circular；Two pieces of described metal ends are respectively arranged at gold
Belong to the top and bottom of post, and by compressing piezoelectric circular after screw threads for fastening；The center of each piece of metal end is all provided with
There is the hole penetrated for multicore cable in metal column；Described preamplifier and flexible PCB is arranged in metal column；
Described polyurethane rubber is used to seal whole hydrophone unit.Electrically soft inside metal column using being built in
Property circuit board connection, and upper aviation plug sockets are connected by cored wire in cable, finally realized compact, built-in
Signal amplifies and output function.The cable at hydrophone unit two ends, can artificially adjust and connect with corresponding contact pin
Line, corresponds to the signal output of corresponding hydrophone unit.It therefore, it can the modular unit as standardization.
As the further improvement of above-mentioned technical proposal, the edge of the metal end is provided with foamed plastics, described
Foamed plastics is squeezed between metal end and piezoelectric circular.
As the further improvement of above-mentioned technical proposal, described preamplifier is defeated using adhesive film type low noise, height
Enter the FET of impedance, low noise scope is less than 20nV/ √ Hz；The scope of high input impedance is 105Ω-107
Ω。
Based on the above-mentioned hydrophone linear array detected for concrete dam, the present invention also provides the system of the hydrophone linear array
Make method, this method includes：
Step 1) select radial direction resonant frequency fr and meet 21kHz ± 3%, electric capacity and meet 6.20nF ± 3%, piezoelectricity
Can d33Meet after the piezoelectric circular of 650pC/N ± 3%, cleaned up using acetone, and select adhesive film type low noise,
The FET of high input impedance is used as preamplifier；
Step 2) center of two pieces of metal ends is respectively penetrated into 16 core cables, and using polyurethane rubber by this 16
The vulcanization of core cable is fixed on metal end；
Step 3) by the 1st to 16 passage in flexible PCB respectively with the cored wire of 16 core cable the 1st to 16 one
End corresponds to connection one by one, the other end of the cored wire of 16 core cable the 1st to 15 respectively with aviation plug sockets the 1st
Connection, the cored wire other end of 16 core cable the 16th and the hydrophone element number where it are corresponded to one by one to 15 nook closing members
Identical nook closing member is connected, and the inside and outside wall of the piezoelectric circular is corresponded to respectively draws positive and negative output line, and will
The positive and negative signal input part of itself and preamplifier connects one to one, the negative signal output of the preamplifier
End and positive signal output end are connected with the 13rd and 16 passages of flexible PCB respectively, the power supply of the preamplifier
Anode and power supply negative terminal are connected with the 14th and 15 passages of flexible PCB respectively；
Step 4) preamplifier and flexible PCB are placed on to the inside of metal column, by provided with foamed plastics
Two pieces of metal ends are then placed in corresponding sealing and filled with compressing piezoelectric circular after the screw threads for fastening on metal column outer wall
In injection molding tool, vulcanize the outer surface of perfusion piezoelectric circular and metal end using polyurethane rubber, form hydrophone list
The shell of member；
Step 5) end of aviation plug sockets is connected into another aviation plug adjacent thereto by connector inserted
Seat, and the clamp nut set on connector is twisted so that the signal input part of each hydrophone unit is adjacent thereto
Another hydrophone unit signal output part docking.
A kind of hydrophone linear array detected for concrete dam of the present invention and preparation method thereof advantage is：
(1) hydrophone linear array sensitivity of the invention is high, substantially increases the resolution ratio of tomography, and then improve
The degree of being practical that ultrasound tomography is calculated；
(2) each hydrophone cellular construction is compact to design in hydrophone linear array of the invention, is on the one hand due to that inside is drawn
Line uses flexible PCB, still further aspect be due to using FET make it is built-in before put, so as to save
The reliability of application is also substantially increased while space；
(3) hydrophone linear array of the invention employs the connection plug-in unit of waterproof, carries out the connection of intermodule, realizes
The modular assembly of making, convenient and efficient in the extreme, further, it is also possible to the number of unit in array is conveniently adjusted,
Get more effective data；
(4) hydrophone linear array of the invention is due to using modular structure design, the cycle for making it assemble and overhaul
Greatly shorten, queueing problem is convenient, while unit is changed easily, therefore, it is possible to be carried out in real time in working site
Trouble-shoots are simultaneously timely repaired.
Brief description of the drawings
Fig. 1 be the embodiment of the present invention in hydrophone linear array connection diagram.
Fig. 2 be the embodiment of the present invention in hydrophone unit structural representation.
Fig. 3 is the schematic diagram tested using the hydrophone linear array of the present invention in pond.
Reference
1st, piezoelectric circular 2, foamed plastics
3rd, metal column 4, metal end
5th, multicore cable 6, preamplifier
7th, flexible PCB 8, polyurethane rubber
9th, aviation plug sockets 10, hydrophone unit
11st, connector
Embodiment
With reference to the accompanying drawings and examples to a kind of hydrophone linear array detected for concrete dam of the present invention
And preparation method thereof be described in detail.
As shown in figure 1, a kind of hydrophone linear array detected for concrete dam that the present invention is provided, including：If
Dry hydrophone unit 10, multicore cable 5 and connector 11；Some cored wires are set in described multicore cable 5,
The signal input part and signal output part of each hydrophone unit 10 are all connected with a multicore cable 5, and select not
The independent pathway that same cored wire is transmitted as each signal of hydrophone unit 10；Each multicore cable 5 away from and its
One end of the hydrophone unit 10 of connection is equipped with aviation plug sockets 9；Described one end of aviation plug sockets 9 is provided with
Each nook closing member it is corresponding with each cored wire in multicore cable 5 weld together, the other end of aviation plug sockets 9 passes through
Connector 11 connects another aviation plug sockets 9 adjacent thereto so that the signal input of each hydrophone unit 10
The signal output part docking of end another hydrophone unit 10 adjacent thereto.
Hydrophone unit in hydrophone linear array based on said structure, the present embodiment includes：Piezoelectric element, shell,
Preamplifier and the flexible PCB for being provided with multichannel；As shown in Fig. 2 described piezoelectric element is using ceramics
The piezoelectric circular 1 that material is made, the piezoelectric element is sealed in shell (not shown)；The two ends of the shell are all provided with
There is a through hole, realize and electrically connect with piezoelectric circular 1 after shell for multicore cable 5 to be penetrated.
Described hydrophone unit 10 is at most settable 30, and when the quantity of the hydrophone unit 10 is not more than
At 12, described multicore cable 5 is the 1st to 16 passage point in 16 core cables, the flexible PCB 7
Not with one end corresponding connection, the cored wire of 16 core cable the 1st to 15 one by one of the cored wire of 16 core cable the 1st to 16
The other end respectively with the corresponding connection, the 16 core cable the 16th one by one of the 1st to 15 nook closing member of aviation plug sockets 9
The cored wire other end is connected with the numbering identical nook closing member of hydrophone unit 10 where it, the piezoelectric circular 1 it is interior,
Outer wall is corresponded to respectively draws positive and negative output line, and by its positive and negative signal input part with preamplifier 6
Connect one to one, the negative signal output end and positive signal output end of the preamplifier 6 respectively with flexible circuit
The 13rd of plate 7 is connected with 16 passages, the power positive end and power supply negative terminal of the preamplifier 6 respectively with flexible electrical
The 14th of road plate 7 is connected with 15 passages.
As shown in Fig. 2 described shell includes：Two pieces of metal ends 4, metal column 3 and polyurethane rubber 8；Institute
The metal column 3 stated is sheathed in piezoelectric circular 1；Two pieces of described metal ends 4 are respectively arranged at metal column 3
Top and bottom, and by compressing piezoelectric circular 1 after screw threads for fastening；The center of each piece of metal end 4 is equipped with confession
The hole that multicore cable 5 is penetrated in metal column 3；Described preamplifier 6 and flexible PCB 7 is arranged at metal
In post 3；Described polyurethane rubber 8 is used to seal whole hydrophone unit 10.The edge of the metal end 4
Provided with foamed plastics 2, described foamed plastics 2 is squeezed between metal end 4 and piezoelectric circular 1.
Chromatographed into when the hydrophone linear array using said structure is applied to hole diameter size for 60mm concrete dam
Position, which is fixed as 2m hydrophone linear array, during picture, between consecutive hydrophones unit will meet disposable while collecting 12
The signal of individual point, in the case of the 500Hz low frequencies source emission signal testing, each hydrophone unit connects
165 ± 3dB will be up to by receiving sensitivity；Design of hydrophone linear array to meeting above-mentioned requirements and preparation method thereof below
It is illustrated.
Above-mentioned hydrophone linear array is made up of 12 hydrophone units using series system, and total length is 100 meters, hydrophone
The distance between unit is 2 meters.The reception type piezoelectricity that each hydrophone unit makes by PZT-5H piezoceramic materials
Pipe is as sensor, and the size for determining piezoelectric circular is φ 40 × φ, 33 × 30mm, using upper and lower inlet-outlet line
Cable is respectively as signal input part and signal output part.In order to further improve reception acoustic sensitivity, in hydrophone
The inside of unit has laid the 20dB preamplifiers that size is 10 × 5 × 2mm.The final size of hydrophone unit
For 45 × 90mm of φ.Preamplifier will meet the requirement of low noise and high input impedance, and can use has height defeated
Enter the FET amplifier of impedance, the multiplication factor of its 10Hz-10000Hz low-frequency range is 20dB, therefore, water
Listening the two ends of the upper and lower outlet of device unit has cable plug (aviation plug sockets), and length is 1.4m, passes through watertightness
Connection plug (connector), length is 30mm, realizes the interconnection between hydrophone unit, and realize that water is listened
The control of the distance between device unit is 2m, is finally assembling to the hydrophone linear array that overall overall length is 100 meters, meets layer
The need for the signal acquiring system for analysing imaging.
With reference to shown in Fig. 1-3, according to concretely comprising the following steps that the hydrophone linear array of above-mentioned design requirement is made：
Step 1) ready piezoelectric circular is detected, its both positive and negative polarity is indicated, resonant frequency, impedance is first carried out
And electric capacity, piezoelectric property d33Uniformity select, wherein radial direction resonant frequency fr need to meet 21kHz ± 3%, electricity
Appearance meets 6.20nF ± 3%, piezoelectric property d33650pC/N ± 3% is met, the piezoelectricity that then will be singled out using acetone
Pipe progress cleans up rear standby；
Select to make the preamplifier of single supply (such as by the FET of adhesive film type low noise, high input impedance
2SK225 FETs), the big I of DC power supply is 12V, and selecting for uniformity, original must be carried out using preceding
It is then that in 10Hz-100kHz frequency range, multiplication factor must is fulfilled for 20dB ± 0.2dB, self noise is less than 20nV/
√ Hz, the scope of high input impedance is 105Ω-107Ω, and after the preamplifier that will be singled out is encapsulated with heat-shrink tube
One end is red-black inlet signal line, and one end is signal wire and power supply supply lines.
Step 2) the urethane skins bag by 16 core external diameters for 8mm is put on at the center of two pieces of metal ends 4 respectively
The cable covered, and 16 core cables are fixed on metal end 4 using polyurethane rubber vulcanization.
Step 3) two ends of flexible PCB 7 are respectively connected with each other with 16 core cables, specific connected mode
It is：The 1st passage to the 12nd passage in the flexible PCB of 16 passages respectively with the 1st cored wire of 16 core cables with
12nd cored wire corresponds to be attached one by one, is used as the output signal of Unit the 1st to Unit the 12nd of hydrophone linear array
Anode；13rd passage of flexible PCB connects the 13rd cored wire of 16 core cables, is used as the output of hydrophone linear array
Signal negative terminal；14th passage of flexible PCB connects the 14th cored wire of 16 core cables, is used as each hydrophone unit
In preamplifier shared power positive end；15th passage of flexible PCB connects the 15th core of 16 core cables
Line, is used as the shared power supply negative terminal of the preamplifier in hydrophone unit；Per the pressure in hydrophone unit 10 all the way
The inside and outside wall of electric pipe 1, corresponds to draw positive and negative two output lines respectively, by its with preamplifier 6 just
Negative signal input is corresponded and is attached, negative signal output end and the flexible PCB 7 of preamplifier 6
13rd passage is connected, and the positive signal output end of preamplifier 6 is with having the 16th in 16 passage flexible PCBs
Paths are connected.The power positive end of preamplifier 6 is connected with the 14th passage of flexible PCB 7, preposition amplification
The power supply negative terminal of device 6 is connected with the 15th passage of flexible PCB 7；
In addition to first hydrophone unit only has output end, it can be interchangeable between remaining 11 hydrophone unit
Connection, the cable output end and input of hydrophone unit during connection, first respectively with the use with 15 nook closing members
The aviation plug sockets of IP68 standards are connected, wherein the 1st of 16 core cables the to the 15th cored wire is respectively with the 1st to the
15 nook closing members are corresponded and are weldingly connected, as the hydrophone unit 10 where the 16th cored wire in 16 core cables and its
Numbering identical nook closing member is connected.Such as the 16th cored wire in the cable of the 1st hydrophone unit is connected with the 1st nook closing member,
The 16th cored wire in 2nd hydrophone unit cable is connected with the 2nd nook closing member, by that analogy.In addition, aviation plug
Socket can also be had made to order by professional plug producer with self manufacture, be welded and the core needle core of printed substrate 15, go forward side by side
Row high-density installation, uses firm shelling machine so that suitable for severe outdoor environment, shell can use stainless steel
Processing, contact pin plug-in card can be using copper alloy processing, surface gold-plating；Insulator is using high temperature resistant, with good insulation
The engineering injection molding of performance；Waterproof grommet can use resistant to elevated temperatures silicon rubber formed.
Step 4) preamplifier 6 and flexible PCB 7 are placed on to the inside of metal column 3；By two pieces added with
The metal end 4 of foamed plastics 2 is tightened with the screw thread on the outer wall of metal column 3 and pushed down after piezoelectric circular 1, is put into phase
In the sealing perfusion mould answered, using the protective layer of the good outside of polyurethane rubber vulcanization perfusion with sound translative performance,
Form the shell of hydrophone unit 10, you can complete the making of hydrophone unit.
Step 5) and then the end of aviation plug sockets 9 is connected into adjacent thereto another by connector 11 navigated
Blind plug socket 9, can be by the water-proof connector with 15 core bore with respect to grafting, and the connection is risen into upper setting
Clamp nut is twisted；So that the signal input part of each hydrophone unit 10 another hydrophone unit 10 adjacent thereto
Signal output part docking, successively by the interconnection between the 1st to the 12nd hydrophone unit one by one, finally
The cable of length needed for the output end of the 12nd hydrophone unit can be connected so that whole hydrophone linear array
Total length is 100m.
In order to truly reflect that hydrophone linear array receives the sensitivity of acoustical signal under practical frequency band, using method of comparison
Receiving sensitivity under low-frequency range 500Hz is tested, as shown in figure 3, in test, by low frequencies
Device lays hydrophone linear array in 1.5m with 500Hz low frequencies signals apart from remote place, then controls each
Hydrophone unit alignment low frequency transmitter is once；Record the reception signal amplitude V of each hydrophone uniti；Then
It is tested in same position with standard receiving hydrophone CS-3B (its 500Hz sensitivity is -214.3dB) to receive
Signal virtual value is V0.Finally calculate the receiving voltage sensitivity of each hydrophone unit
Mo=201g (Vi/Vo) -211.3 (dB), table 1 is that the receiving voltage of each hydrophone unit in two sets of hydrophone linear arrays is sensitive
Spend test result；As shown in Table 1, the sensitivity uniformity of each hydrophone unit is preferable in a set of hydrophone linear array,
Overall to rise and fall in the range of 3dB, the uniformity of two sets of hydrophone linear arrays is also preferable, and receiving voltage sensitivity is up to 165
±3dB。
Table 1
It can be seen from above-mentioned test result, amplitude height, take-off are clear first for the hydrophone linear array that the present invention makes, non-
Often be conducive to working site to obtain high-quality clear tomographic map on the spot, directly can promptly determine concrete
Intensity, the position of internal flaw and size, additionally it is possible to the data such as the degree that wrecks are judged, for using
The Dam Safety Detection that sound wave chromatographic technique carries out Hydro-concrete Structures has good researching value.
It should be noted last that, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although
The present invention is described in detail with reference to embodiment, it will be understood by those within the art that, to the present invention
Technical scheme modify or equivalent substitution, without departure from the spirit and scope of technical solution of the present invention, its is equal
It should cover among scope of the presently claimed invention.
Claims (7)
1. a kind of hydrophone linear array detected for concrete dam, it is characterised in that including：Several hydrophones
Unit (10), multicore cable (5) and connector (11)；Some cored wires are set in described multicore cable (5),
The signal input part and signal output part of each hydrophone unit (10) are all connected with a multicore cable (5), and
The independent pathway that the different cored wire of selection is transmitted as each hydrophone unit (10) signal；Each multicore cable (5)
Aviation plug sockets (9) are equipped with one end away from connected hydrophone unit (10)；The aviation is inserted
Each nook closing member that connector (9) one end is provided with is corresponding with each cored wire in multicore cable (5) to be welded together, the boat
Blind plug socket (9) other end connects another aviation plug sockets (9) adjacent thereto by connector (11),
So that the signal of the signal input part of each hydrophone unit (10) another hydrophone unit (10) adjacent thereto
Output end is docked.
2. the hydrophone linear array according to claim 1 detected for concrete dam, it is characterised in that institute
The hydrophone unit (10) stated includes：Piezoelectric element and shell；Described piezoelectric element is made of ceramic material
Piezoelectric circular (1), the piezoelectric element is sealed in shell；The two ends of the shell are equipped with a through hole, are used for
By multicore cable (5) penetrate after shell with piezoelectric circular (1) realize electrically connect.
3. the hydrophone linear array according to claim 2 detected for concrete dam, it is characterised in that institute
The hydrophone unit (10) stated also includes：Preamplifier (6) and the flexible PCB (7) for being provided with multichannel；
The quantity of the hydrophone unit (10) is not more than 30；When hydrophone linear array includes not more than 12 hydrophones
During unit, described multicore cable (5) is the 1 to 16 in 16 core cables, the flexible PCB (7)
One end corresponding connection, the 16 core cable the 1st to 15 one by one of passage respectively with the cored wire of 16 core cable the 1st to 16
The 1st to the 15 nook closing member corresponding connection one by one of the other end of cored wire respectively with aviation plug sockets (9), 16 core electricity
The cored wire other end of cable the 16th is connected with hydrophone unit (10) numbering identical nook closing member where it, the piezoelectricity circle
The inside and outside wall for managing (1) corresponds to draw positive and negative output line respectively, and by itself and preamplifier (6)
Positive and negative signal input part connects one to one, and the negative signal output end and positive signal of the preamplifier (6) are defeated
Go out 13rd and 16 passages of the end respectively with flexible PCB (7) to be connected, the power supply of the preamplifier (6) is just
End and 14th and 15 passages of the power supply negative terminal respectively with flexible PCB (7) are connected.
4. the hydrophone linear array according to claim 3 detected for concrete dam, it is characterised in that institute
The shell stated includes：Two pieces of metal ends (4), metal column (3) and polyurethane rubber (8)；Described metal column
(3) it is sheathed in piezoelectric circular (1)；Two pieces of described metal ends (4) are respectively arranged at metal column (3)
Top and bottom, and pass through after screw threads for fastening compress piezoelectric circular (1)；The center of each piece of metal end (4)
It is equipped with the hole penetrated for multicore cable (5) in metal column (3)；Described preamplifier (6) and flexible electrical
Road plate (7) is arranged in metal column (3)；Described polyurethane rubber (8) is used to seal whole hydrophone unit
(10)。
5. the hydrophone linear array according to claim 4 detected for concrete dam, it is characterised in that institute
The edge for stating metal end (4) is provided with foamed plastics (2), and described foamed plastics (2) is squeezed in metal end
(4) between piezoelectric circular (1).
6. the hydrophone linear array according to claim 3 detected for concrete dam, it is characterised in that institute
The preamplifier (6) stated is using adhesive film type low noise, the FET of high input impedance, and low noise scope is small
In 20nV/ √ Hz；The scope of high input impedance is 105Ω-107Ω。
7. based on the preparation method for the hydrophone linear array for being used for concrete dam detection described in one of claim 1-6,
It is characterised in that it includes：
Step 1) select radial direction resonant frequency fr and meet 21kHz ± 3%, electric capacity and meet 6.20nF ± 3%, piezoelectricity
Can d33Meet after the piezoelectric circular (1) of 650pC/N ± 3%, cleaned up using acetone, and select adhesive film type low noise
Sound, the FET of high input impedance are used as preamplifier (6)；
Step 2) center of two pieces of metal ends (4) is respectively penetrated into 16 core cables, and utilize polyurethane rubber will
16 core cable vulcanization is fixed on metal end (4)；
Step 3) by the 1st to 16 passage in flexible PCB (7) respectively with the cored wire of 16 core cable the 1st to 16
One end correspond to connection one by one, the other end of the cored wire of 16 core cable the 1st to 15 respectively with aviation plug sockets
(9) the 1st to 15 nook closing member corresponds to connection, the cored wire other end of 16 core cable the 16th and the water where it one by one
Device unit (10) numbering identical nook closing member is listened to connect, the inside and outside wall of the piezoelectric circular (1) is corresponded to respectively draws
Positive and negative output line, and the positive and negative signal input part of itself and preamplifier (6) is connected one to one,
The negative signal output end and positive signal output end of the preamplifier (6) respectively with flexible PCB (7)
13 are connected with 16 passages, the power positive end and power supply negative terminal of the preamplifier (6) respectively with flexible PCB (7)
The 14th be connected with 15 passages；
Step 4) preamplifier (6) and flexible PCB (7) are placed on to the inside of metal column (3), lead to
Two pieces of metal ends (4) provided with foamed plastics (2) are crossed with being compressed after the screw threads for fastening on metal column (3) outer wall
Piezoelectric circular (1), is then placed in corresponding sealing perfusion mould, and perfusion pressure is vulcanized using polyurethane rubber (8)
Electric pipe (1) and the outer surface of metal end (4), form the shell of hydrophone unit (10)；
Step 5) end of aviation plug sockets (9) by connector (11) is connected into adjacent thereto another
Aviation plug sockets (9), and the clamp nut set on connector (11) is twisted so that each hydrophone unit
(10) the signal output part docking of signal input part another hydrophone unit (10) adjacent thereto.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610169700.2A CN107228903B (en) | 2016-03-23 | 2016-03-23 | A kind of hydrophone linear array and preparation method thereof for concrete dam detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610169700.2A CN107228903B (en) | 2016-03-23 | 2016-03-23 | A kind of hydrophone linear array and preparation method thereof for concrete dam detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107228903A true CN107228903A (en) | 2017-10-03 |
| CN107228903B CN107228903B (en) | 2019-07-09 |
Family
ID=59931535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610169700.2A Expired - Fee Related CN107228903B (en) | 2016-03-23 | 2016-03-23 | A kind of hydrophone linear array and preparation method thereof for concrete dam detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107228903B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459083A (en) * | 2018-03-22 | 2018-08-28 | 中国水利水电科学研究院 | A kind of detecting system and its detection method for concrete dam |
| CN108833023A (en) * | 2018-09-11 | 2018-11-16 | 上海掌门科技有限公司 | interception device |
| CN109856653A (en) * | 2018-12-26 | 2019-06-07 | 中国船舶重工集团公司第七一0研究所 | A kind of deep-sea detecting platform multifunctional universal antenna assembly |
| CN110456409A (en) * | 2019-08-06 | 2019-11-15 | 天津大学 | Superfine type hydrophone acquires backpack body and its towed array cable section |
| CN113238233A (en) * | 2021-04-12 | 2021-08-10 | 中船重工海声科技有限公司 | Device and method for quickly measuring sensitivity of long linear array element based on underwater camera |
| CN114659615A (en) * | 2022-03-20 | 2022-06-24 | 南京锐声海洋科技有限公司 | Hydrophone nested fiber damping array and processing method |
| CN116956374A (en) * | 2023-07-24 | 2023-10-27 | 中国人民解放军海军工程大学 | Integrated hydrophone array for measuring near-field radiation noise in shallow sea environment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201327148Y (en) * | 2008-12-10 | 2009-10-14 | 陶青 | On-site signal collecting box |
| CN102901981A (en) * | 2012-10-22 | 2013-01-30 | 中国船舶重工集团公司第七一五研究所 | High hydrostatic pressure-resistant small piezoelectric hydrophone and manufacturing method thereof |
| CN105043442A (en) * | 2015-06-30 | 2015-11-11 | 中国科学院声学研究所 | Self-contained underwater sound and hydrological data synchronous acquisition device, system and method |
-
2016
- 2016-03-23 CN CN201610169700.2A patent/CN107228903B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201327148Y (en) * | 2008-12-10 | 2009-10-14 | 陶青 | On-site signal collecting box |
| CN102901981A (en) * | 2012-10-22 | 2013-01-30 | 中国船舶重工集团公司第七一五研究所 | High hydrostatic pressure-resistant small piezoelectric hydrophone and manufacturing method thereof |
| CN105043442A (en) * | 2015-06-30 | 2015-11-11 | 中国科学院声学研究所 | Self-contained underwater sound and hydrological data synchronous acquisition device, system and method |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459083A (en) * | 2018-03-22 | 2018-08-28 | 中国水利水电科学研究院 | A kind of detecting system and its detection method for concrete dam |
| CN108833023A (en) * | 2018-09-11 | 2018-11-16 | 上海掌门科技有限公司 | interception device |
| CN109856653A (en) * | 2018-12-26 | 2019-06-07 | 中国船舶重工集团公司第七一0研究所 | A kind of deep-sea detecting platform multifunctional universal antenna assembly |
| CN109856653B (en) * | 2018-12-26 | 2023-09-01 | 中国船舶重工集团公司第七一0研究所 | Multifunctional universal antenna device for deep sea detection platform |
| CN110456409A (en) * | 2019-08-06 | 2019-11-15 | 天津大学 | Superfine type hydrophone acquires backpack body and its towed array cable section |
| CN113238233A (en) * | 2021-04-12 | 2021-08-10 | 中船重工海声科技有限公司 | Device and method for quickly measuring sensitivity of long linear array element based on underwater camera |
| CN114659615A (en) * | 2022-03-20 | 2022-06-24 | 南京锐声海洋科技有限公司 | Hydrophone nested fiber damping array and processing method |
| CN114659615B (en) * | 2022-03-20 | 2024-03-19 | 南京锐声海洋科技有限公司 | Hydrophone nested fiber damping array and processing method |
| CN116956374A (en) * | 2023-07-24 | 2023-10-27 | 中国人民解放军海军工程大学 | Integrated hydrophone array for measuring near-field radiation noise in shallow sea environment |
| CN116956374B (en) * | 2023-07-24 | 2024-05-28 | 中国人民解放军海军工程大学 | Integrated hydrophone array for measuring near-field radiation noise in shallow sea environment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107228903B (en) | 2019-07-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107228903A (en) | A kind of hydrophone linear array detected for concrete dam and preparation method thereof | |
| CN107748200B (en) | A kind of weld defect detection piezoelectric-array formula flexible sensor and detection method based on feature guided wave | |
| CN108106965B (en) | Device and method for in-situ synchronous measurement of acoustic and physical parameters of submarine sediment | |
| WO2018209838A1 (en) | System for detecting hydrates near seafloor | |
| CN102928506B (en) | Nondestructive defect detection method of lithium ion battery | |
| CN101335573B (en) | Wideband adaptive matching method and apparatus for submarine sound signal transmitter | |
| CN202256264U (en) | Acoustic emission device for detecting failure of carbon fiber composite material | |
| CN103983695A (en) | Wireless nonmetal ultrasonic detecting system | |
| CN106680380A (en) | System for nondestructive detection on defects of prestress steel strand through ultrasonic guided waves and detection method | |
| CN111123271A (en) | Positioning system and method for underground pipeline | |
| CN105334310A (en) | Testing device and method for electrical characteristics of rock sample in multi-field coupling state | |
| CN107576384A (en) | On-line monitoring system and method for cracks L amb wave of hoisting equipment | |
| CN201236700Y (en) | Sector cement bond logging instrument | |
| CN110487635A (en) | The fast testing system and method for core resistivity and velocity of wave under a kind of stress state | |
| CN206832987U (en) | A kind of parameters,acoustic measurement apparatus of side scan sonar | |
| CN112832301B (en) | Electromagnetic cast-in-place pile and precast pile detection method based on cylindrical coordinate system | |
| CN209841994U (en) | Positioning device for detecting power cable fault and laying route under sea surface | |
| CN218911991U (en) | Intelligent grouting sleeve with built-in annular ultrasonic sensor array | |
| CN111075434A (en) | Portable sound source device for acoustic logging instrument array receiving sound system field detection and using method thereof | |
| CN201322741Y (en) | System using ultrasonic wave to reconstruct three-dimensional defective shape in column structure | |
| CN105651605B (en) | Miniature piezoelectric telescopic element, compression wave measuring apparatus and the method for centrifuge test | |
| CN201273891Y (en) | Ultrasonic nondestructive detector used for ceramic insulator | |
| CN210488004U (en) | Miniature electrode resistivity method testing arrangement | |
| CN205139139U (en) | Rock specimen electrical property characteristic testing arrangement under many field couplings state | |
| CN200996947Y (en) | Electromagnetic-wave transmitt-receiver for building leakage inspecter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190709 Termination date: 20200323 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |