CN108488636A - A kind of detecting system applied to shoal buried pipes supersonic sounding and positioning - Google Patents
A kind of detecting system applied to shoal buried pipes supersonic sounding and positioning Download PDFInfo
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- CN108488636A CN108488636A CN201810069599.2A CN201810069599A CN108488636A CN 108488636 A CN108488636 A CN 108488636A CN 201810069599 A CN201810069599 A CN 201810069599A CN 108488636 A CN108488636 A CN 108488636A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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Abstract
The invention discloses a kind of detecting systems applied to shoal buried pipes supersonic sounding and positioning, including：Multi-channel signal generator module, for generating the acoustic emissions signal that frequency is adjustable, umber of pulse is adjustable, time delay is controllable；Power amplifier module for acoustic emissions signal to be amplified to high-voltage signal, and encourages energy converter to emit acoustic signals into medium；Sound echo reception module, for receiving acoustic signals, including：Amplitude limiter circuit, voltage-controlled amplifying circuit, AD Acquisition Circuit is isolated；Core master control borad, for 8 layers of PCB construction, laminated layer sequence is signals layer, stratum, signals layer, stratum, bus plane, signals layer, stratum, signals layer, increase bottom shielding between signals layer, the core master control borad is communicated for command parameter configuration, sampling triggering, digital filtering and data, including：FPGA submodules and USB2.0 submodules.The present invention, which finally can steadily obtain acoustic signal data and carry out subsequent algorithm process, obtains pipeline detection positioning result.
Description
Technical field
The present invention relates to shoal buried pipes supersonic sounding field more particularly to a kind of inspections based on FPGA and LabVIEW
Examining system designs.
Background technology
It is that common engineering technology is enclosed under current technological conditions that oil pipeline leakage repairing cofferdam operation is buried in shoal
Weir operation effectively can not reduce job area and lead to larger maintenance cost due to cannot still be pin-pointed to pipeline location
And accident risk.To realize that intelligence and automation that Pipeline Leak under environment repairs cofferdam operation are buried in shoal, to pipe
Being accurately positioned for road radial cross-section circle position is essential.Currently, there is no both at home and abroad specialize in it is such can be in construction and excavation
The device systems that buried pipes object edge position is monitored in real time in operation process[1]。
Shoal environment is a kind of non-uniform dielectric that the silt similar to seabed is mixed with water, the Detection location based on sonar
Technology is a technology using maturation but still in being evolving in such environment.Current water widely used in the world
Lower buried pipes Detection Techniques have ROV technologies, side scan sonar technology, multibeam echosounding and side scan sonar hybrid technology, ocean magnetic
Power instrument, CHIRP types be shallow to cut open that instrument, parametric array are shallow to cut open instrument etc., as relevant industries are by the continuous of various countries' attention degree and science research input
Reinforce, also expedited the emergence of out many new submarine pipeline Detection Techniques in recent years, such as synthetic aperture sonar, three-dimensional system of displaying sea-bed images
Deng[2]。
In general, the detection of shoal buried pipes and localization method can be able to use for reference and answer from the above marine technology
With, but any type method cannot individually become whole technical solutions of shoal buried pipes detection, it is necessary to and it is comprehensive
Consider various aspects condition element, start with from the basic theory of acoustic sounding, and combines the acoustic model of shoal buried pipes
The research of hand relevant issues.
Invention content
The present invention provides a kind of detecting system applied to shoal buried pipes supersonic sounding and positioning, the present invention with
Based on FPGA and LabVIEW platform, the overall plan of ultrasound emission acquisition system is devised, sound wave transmitting, signal have been merged
The functions such as power amplification, data acquisition, data processing and communication, after finally capable of steadily obtaining acoustic signal data and carrying out
Continuous algorithm process obtains pipeline detection positioning result, described below：
A kind of detecting system applied to shoal buried pipes supersonic sounding and positioning, the detecting system include：
Multi-channel signal generator module emits letter for generating the sound wave that frequency is adjustable, umber of pulse is adjustable, time delay is controllable
Number；
Power amplifier module for acoustic emissions signal to be amplified to high-voltage signal, and encourages energy converter to be sent out into medium
Penetrate acoustic signals；
Sound echo reception module, for receiving acoustic signals, including：Amplitude limiter circuit, voltage-controlled amplifying circuit, AD acquisitions is isolated
Circuit；
Core master control borad, is 8 layers of PCB construction, and laminated layer sequence is signals layer, stratum, signals layer, stratum, bus plane, signal
Layer, stratum, signals layer, increase bottom shielding between signals layer, and the core master control borad is touched for command parameter configuration, sampling
Hair, digital filtering and data communication, including：FPGA submodules and USB2.0 submodules.
Energy-storage module is additionally provided between power amplifier module and voltage-controlled amplifying circuit, the energy-storage module selects capacitance
Capacitance is the electrolytic capacitor of 3000 μ F.
Further, the Multi-channel signal generator module uses AD9959 chips, is made of substantially four DDS kernels
Signal generation unit, each DDS kernels provide independent frequency, phase and amplitude programming；One public system of all channels shares
System clock.
Wherein, the power amplifier module amplifies voltage using OPA445 two-stage cascade modes, straight by OCL output capacitance-less
Termination power amplification electric current is connect, is connected with energy converter through transformer variable resistance and resonance matching network.
Further, the receiving terminal with energy converter joining place of the isolation amplitude limiter circuit are by T/R switches and a pair of of polarity
The transmitting amplitude limiter circuit of opposite diode composition；
Q1 to Q4 selects MMBT2907 patch type triodes, and the collector of Q1 to Q4 connects connects amplifying circuit later together；
D1 to D4 selects BAV99 switching diodes, the channels T1 to T4 to connect energy converter, remaining pin is hanging.
Wherein, the voltage-controlled amplifying circuit has selected the AD605 chips of two-stage cascade, the AD Acquisition Circuit to select
AD9216 chips.
Further, the FPGA submodules select Xilinx Spartan6LX45 chips, design emission signal frequency and are
100KHz, AD sample rate are 500KHz, and digit is 16.
Wherein, the detecting system further includes power module,
The front end of the power module is by Switching Power Supply integrated transformer and 5A rectifications, output ± 40V dual power supplies, is work(
Rate amplification module is powered；
Another way 40V exports 5V by LM2596 voltage reduction modules, as total input of each number and analog chip, passes through
LM1117-XXX family chips, ADR4525, ADR130, MAX660 form electric power network, for each different chip power supplies.
When specific implementation, it is integrated with the interface of various peripheral chips on the FPGA submodules, includes mainly and DDS module
Interface, delay and pulse number control PWM wave output interface, USB2.0 control interfaces, gating interface, gain control connect
Mouth, AD conversion module interface.
Further, the detecting system further includes：Host computer design based on LabVIEW, specifically includes：
1) triggering/sampling；2) DDS is arranged；3) these three tasks are arranged in gating；
Three tasks have respective asynchronous external trigger conditions, LabVIEW to have the measure of itself to ensure three external triggers
The alternative of signal, synchronization has and only there are one trigger signals；
" triggering/sampling " task can constantly judge whether to have selected timers trigger sampling, if opening timer,
Once timer spilling will trigger a sampling task, and not overflow, ready state can be returned to；
If Off Timer, by the primary sampling of button triggering of program panel, envelope is carried out to obtained echo-signal
Detection, and its maximum value is judged whether in setting range, if so, returning to ready state waits for next subtask, if it is not, then
Ready state is returned after changing corresponding gain setting.
The advantageous effect of technical solution provided by the invention is：
1, the present invention proposes shoal buried pipes detection and the Location System Design scheme in a kind of small-sized 4 channel, introduces
The design of the hardware and corresponding program software of transmitting module and receiving module, including：DDS signal generating modules, power amplification
Module, high pressure and accumulator module receive amplification module, FPGA master controls and usb communication module etc., and master-plan has reached work(
It can require；
2,4 channel emission and reception system can easily carry out port number extension on hardware and programming, with
Adapt to the detection demand under different condition；
3, the present invention meets design requirement by the function of water tank verification experimental verification system transmitting and receiving module, and passes through mould
Intend shoal environmental test system to detect in actual application environment and the performance of targeted duct；
4, the experimental results showed that, the design of this system has the applicability under certain technical merit and specific environment, can
As the detection of shoal buried pipes and the ideal software and hardware experiment porch of relevant issues.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram applied to shoal buried pipes supersonic sounding and the detecting system of positioning
Fig. 2 is a kind of another structural schematic diagram applied to shoal buried pipes supersonic sounding and the detecting system of positioning；
Fig. 3 is the design framework figure of power-supply system；
Fig. 4 is amplitude limit and isolates circuit diagram；
Fig. 5 is FPGA main control module functional block diagrams；
Fig. 6 is LabVIEW software workflow figures；
Fig. 7 is water tank experiment porch figure；
Fig. 8 is that water tank tests echo-signal figure；
Fig. 9 is simulation shoal environment experiment platform figure；
Figure 10 is simulation shoal environment echo-signal figure.
In attached drawing, what each component represented is listed as follows：
1：Multi-channel signal generator； 2：Power amplifier module；
3：Energy converter； 4：Sound echo reception module；
5：Core master control borad； 6：Energy-storage module；
7：Power module； 41：Amplitude limiter circuit is isolated；
42：Voltage-controlled amplifying circuit； 43：AD Acquisition Circuit；
51：FPGA submodules； 52：USB2.0 submodules.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention is made below further
It is described in detail on ground.
With the rapid development of electronic technology and computer technology, emission control has had at present with multichannel collecting system
More mature solution and very high feasibility are established to design suitable for the ultrasonic detection system of shoal environment buried pipes
Basis is determined.Wherein, the system master unit based on FPGA has many advantages, such as high-performance, fast parallel processing, it can be achieved that system
The dynamic configuration of parameter, to meet the testing requirements under varying environment, and can be by powerful data-handling capacity implementation pattern
The cutting edge technologies application such as identification, machine learning, visual enhancement is that the such ultrasound emission of design and the important of reception system are put down
Platform.
Embodiment 1
A kind of detecting system applied to shoal buried pipes supersonic sounding and positioning, referring to Fig. 1 and Fig. 2, the detection system
System includes：
Multi-channel signal generator (DDS) module 1 generates the sound wave transmitting that frequency is adjustable, umber of pulse is adjustable, time delay is controllable,
Excitation energy converter 3 emits sound wave into medium after being amplified to high-voltage signal via power amplifier module 2.
Sound echo reception module 4 includes：Amplitude limiter circuit 41, voltage-controlled amplifying circuit 42, AD Acquisition Circuit 43 is isolated.
Core master control borad 5 includes：FPGA submodules 51 and USB2.0 submodules 52, FPGA submodules 51 are responsible for each
The timing control of module, including：Command parameter configures and samples the functions such as triggering, digital filtering, data communication.
Energy-storage module 6 is additionally provided between power amplifier module 2 and voltage-controlled amplifying circuit 42.
The detecting system further includes：Power module 7, for powering for the modules in detecting system.
In conclusion the embodiment of the present invention merged sound wave transmitting, signal power amplification, data acquisition, data processing with
The functions such as communication, finally can steadily obtain acoustic signal data, and carry out subsequent algorithm process to obtain pipeline detection fixed
The result of position.
Embodiment 2
The scheme in embodiment 1 is further introduced with reference to specific data, attached drawing, it is as detailed below to retouch
It states：
One, the design of DDS module 1 is as follows：
Wherein, DDS signal emission modules are the generation modules of detecting system pumping signal, are to generate frequency, phase, delay
Controllable multichannel (embodiment of the present invention designs 4 channels) signal generator, is controlled by the controlling bus of FPGA submodules 51.
DDS module 1 in the embodiment of the present invention is using the AD9959 chips of ADI companies, and the AD9959 chips are by four DDS
Kernel constitutes baseband signal generation unit, and each DDS kernels can provide independent frequency, phase and amplitude programming.This spirit
Active, highly integrated property is especially suitable for the functional requirement of this detecting system, in addition to this, due to one public system of all channels shares
System clock, therefore they have fixed clock synchronism, can support the synchronization of multiple equipment, it is convenient from now on into row of channels
Several extensions.
Two, the design of power amplifier module 2 is as follows：
The shoal medium situation of buried pipes is complicated, and when the acoustic signals of transmitting enter in medium, Acoustic Wave Propagation is by shallow
The absorption of beach medium is stronger, and attenuation amplitude is very big.Acoustic signals are believed to obtain preferable medium penetration power and echo signal-to-noise ratio
Number power amplification it is indispensable.The final performance that entire power amplifier module 2 designs requires table 1 such as to indicate.
The requirement of 1 power amplifier module performance design of table
Since the signal peak value of AD9959 chips output is 500mV, need to reach 200V after power amplification, when bringing onto load
Maximum current can reach 10mA, according to the common practices of current solution, in order to largely reduce board area, work(
The selection of rate amplification module 2 amplifies voltage using OPA445 two-stage cascade modes, passes through OCL (OCL output capacitance-less direct-coupling) circuit
Amplify electric current, is most connected afterwards with energy converter through transformer variable resistance and resonance matching network, reaches final design requirement.
Three, the design of amplitude limit isolation circuit 41 is as follows：
Amplitude limit isolation circuit 41 is connected with transmitting network as the front end being connected with energy converter 3, plays protection and isolation
Effect.The transmitting amplitude limit that receiving circuit is switched with 3 joining place of energy converter by T/R and a pair of opposite polarity diode forms
Circuit, as shown in Figure 3.After wherein Q1 to Q4 selects MMBT2907 patch type triodes, the collector C-terminal of Q1 to Q4 to connect together
Connect amplifying circuit.D1 to D4 selects BAV99 switching diodes, the channels T1 to the channels T4 to connect energy converter, remaining pin is hanging.
Control1 to Control 4 in Fig. 3 is the gating signal provided by FPGA control shift registers.It is logical with T1
For the signal in road, Q1 is a PNP triode, and front end acts on after being superimposed 5V direct current signals with the sound echo-signal received
In Q1 emitter Es.When 1 signals of Control are low level (0V), PNP pipe conducting, and when it is high level (5V), no
Meet turn-on condition, which is isolated.
Four, the design of voltage-controlled amplifying circuit 42 and AD Acquisition Circuit 43 is as follows：
Sound echo-signal is very faint AC signal mostly, and for data collecting system, signal amplification is
Key link before carrying out AD acquisitions.On the other hand, since the acoustic environment that active acoustic systems face can change frequent occurrence,
The size of sound echo-signal can change with environmental change, therefore also be wanted for amplifying circuit and AD data collecting systems
Make corresponding countermeasure.For voltage-controlled amplifying circuit 42, this system has selected the AD605 of two-stage cascade as voltage-controlled amplification
The main body chip of circuit 42, and AD Acquisition Circuit 43 selects AD9216 chips.
Five, the design of FPGA submodules 51 is as follows：
Comprehensive various aspects factor and performance requirement select Xilinx Spartan6LX45 chips as FPGA device, design
Emission signal frequency is 100KHz, and AD sample rates are 500KHz, and digit is 16.
Six, the design of USB2.0 submodules 52 is as follows：
The CY68013 for selecting Cypress companies to release, inside contain 8051 cores of enhancing, can be according to compiling
Good firmware program automatically processes USB2.0 agreement tasks, and complicated USB communication protocol is reduced between FPGA and USB controller
Parallel bus communication.
Seven, the design of energy-storage module 6 is as follows：
The acoustic signals of this detecting system transmitting are single-frequency rectangular wave pulse, need to discharge big energy in a short time
(design single channel instantaneous maximum output voltage ± 200V, maximum output current 100mA), conventional DC power supply can not provide such as
This big instantaneous power, it is therefore desirable to carry out the design of storage capacitor.It is the electrolysis of 3000 μ F that capacitor's capacity is selected in this system
Capacitance.
Eight, the design of power module 7 is as follows：
Reliable power supply module is the guarantee of detecting system normal work, this detecting system mainly has for electricity output：Work(
The high voltage power supply (± 40V) of rate amplification module 2, the power supply (3-5V) of each FPGA, AD, DA chip and machine reference power supply (1-
5V).The overall framework of power module 7 is as shown in Figure 4.
The front end of power module 7 is by Switching Power Supply integrated transformer and 5A rectifications, output ± 40V dual power supplies, is power
Amplification module 2 is powered.Another way 40V exports 5V by LM2596 voltage reduction modules, as each digital and analog chip total defeated
Enter.By LM1117-XXX family chips, ADR4525, ADR130, MAX660 forms electric power network, is supplied for each different chips
Electricity.
Nine, the design of Electro Magnetic Compatibility (EMC) is as follows：
USB2.0 is controlled chip (i.e. USB2.0 submodules 52) and fpga chip (i.e. FPGA submodules by this detecting system
51) design is on same core master control borad 5, and the pin of core master control borad 5 is numerous, and cabling is complicated, there is numerous high speed signals
Cabling is high to EMC design requirements.
Core master control borad 5 is designed as 8 layers of PCB construction by this detecting system, laminated layer sequence be signals layer, stratum, signals layer,
Stratum, bus plane, signals layer, stratum, signals layer increase bottom shielding between signals layer, effectively prevent signal layer-to-layer signal transfer.
In addition, placing stratum by bus plane so that current path loop area is minimum.
Ten, the programming of detecting system
The step it is detailed operation be：
1) programming of fpga chip：
Fpga chip is responsible for operation logic control and the data transmission of entire detecting system, is the control core of slave computer.
The interface of various peripheral chips is integrated on fpga chip, main interface, delay and pulse number control comprising with DDS module 1
The PWM wave output interface of system, USB2.0 control interfaces, gating interface, gain control interface, AD conversion module interface etc..
Other than the corresponding driving comprising each peripheral interface and data processing module, further comprise：The life of host state machine
Enable parsing and processing unit, Clock management module, BlockRAM data storage modules, sampling and filtering etc..FPGA main control modules
Functional framework it is as shown in Figure 5.
2) the host computer design based on LabVIEW：
LabVIEW program work overall procedures are as shown in Figure 6.Detecting system is passed through one section of initialization operation and is entered after the power is turned on
Ready state.There are three task readies altogether for upper computer software：(1) triggering/sampling；(2) DDS is arranged；(3) gating is set
It sets.Three tasks have respective asynchronous external trigger conditions, LabVIEW to have measure three outer triggering signals of guarantee of itself
Alternative, that is to say, that synchronization has and only there are one trigger signals.
" triggering/sampling " task can constantly judge whether to have selected timers trigger sampling, if opening timer,
Once timer spilling will trigger a sampling task, and not overflow, ready state can be returned to；If closing timer,
The button by program panel is needed to trigger primary sampling, and after triggering sampling, envelope detection is carried out to obtained echo-signal,
And its maximum value is judged whether in setting range, if so, returning to ready state waits for next subtask, if it is not, then changing phase
Ready state is returned after the gain setting answered.
" DDS settings " task and " gating be arranged " task are triggered by the corresponding button of program panel.After the completion of task
Return to ready state.
In conclusion the embodiment of the present invention merged sound wave transmitting, signal power amplification, data acquisition, data processing with
Communication etc. functions, finally can steadily obtain acoustic signal data and carry out subsequent algorithm process obtain pipeline detection positioning
As a result.
Embodiment 3
Feasibility verification is carried out to the scheme in Examples 1 and 2 with reference to specific example, it is described below：
The experimental situation for building laboratory condition Imitating buried pipes carries out system testing, the detailed operation of the step
For：
1) water tank experiment porch is built, pipeline local environment is full of water, as shown in Figure 7.If pipeline is at a distance from energy converter
For 40cm, the centre frequency using energy converter is 100kHz, and excitation voltage peak value is 40V, and pulse number is 4, systematic sampling
Rate is set as 5MHz, voltage controlled gain 20dB.
Experimental system measure echo-signal as shown in figure 8, it can be seen that：
(1) echo of water tank experiment has preferable signal-to-noise ratio, can clearly judge the peak position of echo.
(2) pipe surface is to the pip more than one of echo, the pulse number N of echo-signal0＞ 4, there are one for signal
Fixed broadening is to influence detection accuracy.
2) simulate shoal environmental experiment, into container be added sufficient amount silt, be respectively set buried depth of pipeline be 30cm and
The situation of 40cm, as shown in Figure 9.
Setting exciting signal frequency is same as above with excitation voltage peak value.Since opposite water environment is more difficult to sound wave in silt medium
It penetrates, so setting pulse number N >=6, when voltage controlled gain is 25dB, just it is observed that more apparent echo-signal, such as schemes
Shown in 10.
It can be seen from fig. 10 that echo Signal-to-Noise is poor under silt media environment, co-channel interference is also more serious,
But the position that crest location respectively appears in 30cm, 40cm can be will become apparent from from Figure 10, it was demonstrated that detecting system is shallow
Validity in beach environment pipeline detection and positioning.
Bibliography
[1] normal text deep-water subsea Pipe Repair Systems engineering Application Research [D] the University Of Tianjin of king：The institute of civil engineering,
2010.
[2] Yang Min, Song Sheng, Wang Fang, palace vinine bury submarine pipeline detection method and the oceans new technology application research [J]
Science, 2015, (06):129-132.
To the model of each device in addition to doing specified otherwise, the model of other devices is not limited the embodiment of the present invention,
As long as the device of above-mentioned function can be completed.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Serial number is for illustration only, can not represent the quality of embodiment.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of detecting system applied to shoal buried pipes supersonic sounding and positioning, which is characterized in that the detecting system
Including：
Multi-channel signal generator module, for generating the acoustic emissions signal that frequency is adjustable, umber of pulse is adjustable, time delay is controllable；
Power amplifier module for acoustic emissions signal to be amplified to high-voltage signal, and encourages energy converter transmitting sound into medium
Wave signal；
Sound echo reception module, for receiving acoustic signals, including：Amplitude limiter circuit, voltage-controlled amplifying circuit, AD acquisition electricity is isolated
Road；
Core master control borad, be 8 layers of PCB construction, laminated layer sequence be signals layer, stratum, signals layer, stratum, bus plane, signals layer,
Stratum, signals layer, the increase bottom shielding between signals layer, the core master control borad is configured for command parameter, sampling triggers,
Digital filtering and data communication, including：FPGA submodules and USB2.0 submodules.
2. a kind of detecting system applied to shoal buried pipes supersonic sounding and positioning according to claim 1, special
Sign is, energy-storage module is additionally provided between power amplifier module and voltage-controlled amplifying circuit,
It is the electrolytic capacitor of 3000 μ F that the energy-storage module, which selects capacitor's capacity,.
3. a kind of detecting system applied to shoal buried pipes supersonic sounding and positioning according to claim 1, special
Sign is that the Multi-channel signal generator module uses AD9959 chips, and constituting baseband signal by four DDS kernels generates list
Member, each DDS kernels provide independent frequency, phase and amplitude programming；One common system clock of all channels shares.
4. a kind of detecting system applied to shoal buried pipes supersonic sounding and positioning according to claim 1, special
Sign is that the power amplifier module amplifies voltage using OPA445 two-stage cascade modes, passes through OCL output capacitance-less direct-coupling
Circuit amplifies electric current, is connected with energy converter through transformer variable resistance and resonance matching network.
5. a kind of detecting system applied to shoal buried pipes supersonic sounding and positioning according to claim 1, special
Sign is,
The receiving terminal of the isolation amplitude limiter circuit is by T/R switches and a pair of opposite polarity diode group with energy converter joining place
At transmitting amplitude limiter circuit；
Q1 to Q4 selects MMBT2907 patch type triodes, and the collector of Q1 to Q4 connects connects amplifying circuit later together；D1 is arrived
D4 selects BAV99 switching diodes, the channels T1 to T4 to connect energy converter, remaining pin is hanging.
6. a kind of detecting system applied to shoal buried pipes supersonic sounding and positioning according to claim 1, special
Sign is that the voltage-controlled amplifying circuit has selected the AD605 chips of two-stage cascade, the AD Acquisition Circuit to select AD9216 cores
Piece.
7. a kind of detecting system applied to shoal buried pipes supersonic sounding and positioning according to claim 1, special
Sign is that it is 100KHz, AD that the FPGA submodules, which select Xilinx Spartan6LX45 chips, design emission signal frequency,
Sample rate is 500KHz, and digit is 16.
8. a kind of detecting system applied to shoal buried pipes supersonic sounding and positioning according to claim 1, special
Sign is that the detecting system further includes power module,
The front end of the power module is by Switching Power Supply integrated transformer and 5A rectifications, and output ± 40V dual power supplies are put for power
Big module for power supply；
Another way 40V exports 5V by LM2596 voltage reduction modules, as total input of each number and analog chip, passes through
LM1117-XXX family chips, ADR4525, ADR130, MAX660 form electric power network, for each different chip power supplies.
9. a kind of detecting system applied to shoal buried pipes supersonic sounding and positioning according to claim 1 or claim 7,
It is characterized in that, the interface of various peripheral chips is integrated on the FPGA submodules, the main interface comprising with DDS module prolongs
When with pulse number control PWM wave output interface, USB2.0 control interfaces, gating interface, gain control interface, AD conversion mould
Block interface.
10. a kind of detecting system applied to shoal buried pipes supersonic sounding and positioning according to claim 1, special
Sign is that the detecting system further includes：Host computer design based on LabVIEW, specifically includes：
1) triggering/sampling；2) DDS is arranged；3) these three tasks are arranged in gating；
Three tasks have respective asynchronous external trigger conditions, LabVIEW to have the measure of itself to ensure three outer triggering signals
Alternative, synchronization has and only there are one trigger signal；
" triggering/sampling " task can constantly judge whether to have selected timers trigger sampling, if opening timer, once
Timer spilling will trigger a sampling task, and not overflow, can return to ready state；
If Off Timer, by the primary sampling of button triggering of program panel, envelope detection is carried out to obtained echo-signal,
And its maximum value is judged whether in setting range, if so, returning to ready state waits for next subtask, if it is not, then changing
Ready state is returned after corresponding gain setting.
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| CN110109125A (en) * | 2019-05-16 | 2019-08-09 | 中国科学院声学研究所东海研究站 | Spherical surface focusing Phased Parametric Array acoustic detection device |
| CN112270878A (en) * | 2020-09-29 | 2021-01-26 | 中国人民解放军海军工程大学 | Synthetic aperture experiment system, experiment method and high-resolution detection equipment |
| CN112799077A (en) * | 2021-04-14 | 2021-05-14 | 武汉中岩科技股份有限公司 | Sonar detecting system based on water pipeline |
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| CN112270878A (en) * | 2020-09-29 | 2021-01-26 | 中国人民解放军海军工程大学 | Synthetic aperture experiment system, experiment method and high-resolution detection equipment |
| CN112799077A (en) * | 2021-04-14 | 2021-05-14 | 武汉中岩科技股份有限公司 | Sonar detecting system based on water pipeline |
| CN112799077B (en) * | 2021-04-14 | 2021-07-20 | 武汉中岩科技股份有限公司 | Sonar detecting system based on water pipeline |
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