CN104515809B - Device and method for identifying identities of power cables based on ultrasonic wave - Google Patents
Device and method for identifying identities of power cables based on ultrasonic wave Download PDFInfo
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- CN104515809B CN104515809B CN201510020386.7A CN201510020386A CN104515809B CN 104515809 B CN104515809 B CN 104515809B CN 201510020386 A CN201510020386 A CN 201510020386A CN 104515809 B CN104515809 B CN 104515809B
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Abstract
The invention discloses a device for identifying the identities of power cables based on an ultrasonic wave. The device comprises a signal transmission module, a signal receiving module and an information processing and decoding module, wherein the signal transmission module is coupled with one end of one of the power cables to be identified, and transmits a linear frequency modulation vibration signal with specific frequency in a timing mode at equal intervals; the signal receiving module is coupled with the other ends of the power cables to be identified, and is used for receiving the signals of the power cables to be identified; the information processing and decoding module is connected with the signal receiving module, and is used for carrying out related processing such as matched filtering on the received signals to complete the identification of the power cables. The device is used for identifying the complicated power cables without damaging the cables, and is suitable for the identification of the power cables with different thickness; the device is simple in structure, low in cost, convenient to use and higher in safety and reliability.
Description
Technical field
The present invention relates to ultrasound detection and analysis technical field are and in particular to arrive a kind of power cable based on ultrasonic wave
Personal identification method and device.
Background technology
Underground power cable refers to the electrical lead of below ground that is laid in, because underground pipe network is complicated, and have
Direct-buried cable under frozen soil layer, when underground power cable is damaged due to various extraneous or immanent cause, due at it
In below ground, human eye is difficult to, and adds that power cable also can occur to be wound around so that underground electric is electric due to due to construction
Cable identification increases with changing work difficulty.There is presently no one conveniently identification underground power cable method and
Device.
Content of the invention
In consideration of it, it is an object of the invention to provide a kind of power cable identity recognition device based on ultrasonic wave and method,
This device passes through the linear frequency modulation vibration signal that transmitting has CF, and matching wave filter combines, and accurately knows
Not every different cable, reliability is high, meanwhile, provides a kind of power cable personal identification method.
An object of the present invention is achieved through the following technical solutions, and the purpose of the present invention is by following technical side
Case realize, a kind of power cable identity recognition device based on ultrasonic wave, including signal emission module, signal receiving module,
Information processing and decoder module data analysis module;
Described signal emission module, is coupled with one end of wherein power cable to be identified, sends out for timing at equal intervals
Penetrate a linear frequency modulation vibration signal with CF;
Described signal receiving module, this signal receiving module other end coupling with each power cable to be identified respectively
Close, for receiving the signal of power cable to be identified;
Described information is processed and decoder module, is connected with signal receiving module, for the signal receiving is carried out with coupling filter
Ripple, completes power cable identification.
Further, described signal emission module includes linear frequency modulation vibration signal generation module, transmitting ultrasonic transducer
With a gps clock module, described linear frequency modulation vibration signal generation module is in the effect of a gps clock module pulse per second (PPS)
Under, at equal intervals timing transmitting linear frequency modulation vibration signal act on transmitting ultrasonic transducer, this transmitting ultrasonic transducer respectively with
One end coupling of each power cable to be identified.
Further, described signal receiving module includes the reception ultrasonic transducer that several are mated with transmitting ultrasonic transducer
With to the programmable amplifier that is amplified of output signal receiving ultrasonic transducer, described several receive ultrasonic transducers and treat
The other end coupling of identification power cable, each receives ultrasonic transducer and corresponds to a power cable to be identified.
Further, described process and decoder module includes being sequentially connected filtration module, a/d converter, second programmable patrols
Collect device fpga and the second microprocessor;Described filtration module is connected with control journey amplifier, for carrying out to the signal after amplifying
Filtering;Described a/d converter is used for for filtered signal being converted into data signal;Described second PLD fpga
For data signal is carried out with matched filtering, described second microprocessor is connected with the second PLD fpga, according to
Root is tied in matched filtering, completes power cable identification.
Further, described information processes and also includes the 2nd gps clock module, described 2nd gps clock mould with decoder module
Block is connected with the second microprocessor, the second PLD fpga respectively.
Further, this power cable identity recognition device and method also include display module, described display module and second
Microprocessor connects, for showing positioning result.
The second object of the present invention is to provide a kind of power cable personal identification method based on ultrasonic wave, walks including following
Rapid:
Signal emission module is coupled by step 1. with one end of wherein power cable to be identified, and is launched with this signal
Module produces a linear frequency modulation vibration signal with CF;
Signal receiving module is coupled by step 2. respectively with the other end of each power cable to be identified, and receives electric power
The linear frequency modulation vibration signal with CF of cable transmission;
Step 3. information processing and decoder module carry out matched filtering to the echo-signal receiving, and are tied according to matched filtering
Fruit is analyzed to signal, and the power cable corresponding to signal amplitude maximum is identified power cable.
Further, also include step 4, after identifying power cable, determine the length of power cable, method particularly includes:
L=(δ t-ts) v, wherein: l is the length identifying cable;V is ultrasonic signal spread speed in the cable;ts
For the intrinsic system delay of signal emission module and signal receiving module;δ t shakes for the linear frequency modulation that signal emission module sends
Dynamic signal and the time difference of receipt signal, wherein
l1、l2Represent power cable known to length, δ t1Represent cable l1
Middle pumping signal and the time difference of receipt signal, δ t2Represent cable l2Middle pumping signal and the time difference of receipt signal.
Due to employing technique scheme, the present invention has the advantage that:
A kind of power cable identity recognition device based on ultrasonic wave proposed by the present invention and method, for complicated electricity
Power cable is differentiated, without destroy cable it is adaptable to any thickness power cable identification.Structure is simple, with low cost,
Safe and efficient, danger will not be brought to cable itself and testing staff in detection process.Reliability is high, in one section of cable plus ultrasonic
Signal, the signal energy of the relatively other cable of the cable corresponding in other end reception ultrasonic vibration signal is the strongest, by coupling
After wave filter, add the energy of the energy of ultrasonic signal cable apparently higher than other cable signals.The present invention can be quickly effective
Ground differentiates the cable that need to change, and has a good application prospect.
Brief description
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing the present invention is made into
The detailed description of one step, wherein:
Fig. 1 is a kind of structural representation of the power cable identity recognition device based on ultrasonic wave of the present invention;
Fig. 2 is the system block diagram that linear frequency modulation vibration signal of the present invention produces and launches;
Fig. 3 is the coupled modes schematic diagram of transducer of the present invention and cable to be detected;
Fig. 4 is information processing of the present invention and decoder module.
Specific embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail;It should be appreciated that preferred embodiment
Only for the present invention is described, rather than in order to limit the scope of the invention.
As shown in figure 1, a kind of power cable identity recognition device based on ultrasonic wave, including signal emission module, signal
Receiver module, information processing and decoder module and display module;
Described signal emission module, is coupled with one end of wherein power cable to be identified, at equal intervals timing transmitting one
The individual linear frequency modulation vibration signal with CF;
Described signal receiving module, this signal receiving module other end coupling with each power cable to be identified respectively
Close, for receiving the signal of power cable to be identified;
Described information is processed and decoder module, is connected with signal receiving module, for the signal receiving is carried out with coupling filter
Ripple, completes power cable identification;
Described display module is connected to information processing and decoder module, for showing positioning result.
As shown in Figure 2,3, 4, described signal emission module includes linear frequency modulation vibration signal generation module, transmitting ultrasonic wave
Transducer and gps clock module, specifically, linear frequency modulation vibration signal generation module include first microprocessor (mcu) and
First PLD (fpga), first microprocessor is connected with the first PLD, and gps clock module passes through
Serial ports is connected with microprocessor, and the pulse per second (PPS) that gps clock module sends acts on the first PLD, at equal intervals timing
Transmitting linear frequency modulation vibration signal, after analog-to-digital conversion and high drive, acts on transmitting ultrasonic transducer, launches preset frequency
And the linear frequency modulation vibration signal of feature.
Described signal receiving module includes the reception ultrasonic transducer that several are mated with transmitting ultrasonic transducer, and right
Receive the programmable amplifier that is amplified of output signal of ultrasonic transducer, described several receive ultrasonic transducers with to be identified
The other end coupling of power cable, each receives ultrasonic transducer and corresponds to a power cable to be identified.
In the present embodiment, the section close-coupled of the plane of transmitting ultrasonic transducer and power cable to be identified, from
Ultrasonic wave is launched in this direction, and this coupled modes can make the ultrasonic signal energy more preferable receiving end ultrasonic transducer of transmitting
Received;Receive ultrasonic transducer also to couple in the other end of power cable in the same way, receive ultrasonic echo.
Described process includes being sequentially connected filtration module, a/d converter, the second PLD with decoder module
Fpga, the second microprocessor and the 2nd gps clock module;Described 2nd gps clock module respectively with the second microprocessor, second
PLD fpga connects, and the 2nd gps clock module sends pulse per second (PPS) and acts on the second PLD fpga.
Described filtration module is connected with control journey amplifier, for being filtered to the signal after amplifying;Described a/d converter is used for filtering
Signal after ripple is converted into data signal;Described second PLD fpga is used for data signal is carried out with coupling filter
Ripple, described second microprocessor is connected with the second PLD fpga, according to matched filtering result, completes power cable
Identification.Second microprocessor calculates according to the output result of matched filter and receives ultrasonic transducer receipt signal
The size of amplitude, the power cable corresponding to amplitude maximum is identified power cable.
Based on the design philosophy of said apparatus, the present invention provides a kind of power cable identification side based on ultrasonic wave
Method, specifically includes following steps:
Signal emission module is coupled by step 1. with one end of wherein power cable to be identified, and is launched with this signal
Module produces a linear frequency modulation vibration signal with CF.
In this step, the expression formula of linear frequency modulation vibration signal is:
In the present embodiment, f0=50khz, t=1ms, b=30khz.
Signal receiving module is coupled by step 2. respectively with the other end of each power cable to be identified, and receives electric power
The linear frequency modulation vibration signal of cable transmission, in the present embodiment, calculates for convenience, takes two-way power cable to illustrate.
Step 3. information processing and decoder module carry out matched filtering to the linear frequency modulation vibration signal receiving, according to
Join filter result signal is analyzed, the power cable corresponding to signal amplitude maximum is identified power cable.
Two-way receives signal input after programmable amplifier amplification, LPF, a/d conversion that ultrasonic transducer receives
To fpga, to two-way transducer received linear frequency modulation vibration signal r in fpga1(x, t), r2(x, t) does Fourier transformation,
Obtain its frequency spectrum r1(x, ω), r2(x, ω) delivers to follow-up matched filter and carries out matched filtering, and matched filter is in fpga
Portion realizes.
In the present embodiment, the implementation method of matched filtering is:
1) signal to noise ratio snr is defined as:Wherein rmT () is the output signal of wave filter, pn
It is average noise power.If the transmission function of passive filter is h (f), signal amplitude after this wave filter is:R hereiniF () is the frequency spectrum of input signal.After this wave filter, noise
Power spectrum is:P herein0For noise power spectrum.
2) by Shi Waxin, then inequality can obtain When
When, obtain equal sign, now corresponding wave filter is matched filter, gaTake 1, its impulse response is the mirror image of input signal,
But it is shifted t on a timeline1, as: h (t)=gari(t1- t), thus know that matched filter can obtain the signal to noise ratio of maximum.
3) spectrum signal being obtained by fpga process is input to again and in matched filter, carries out matched filtering process: coupling
Filtered signal is r (x, ω)=ri(x, ω) h (ω) i=1,2, ri(x, ω) is input signal, and h (ω) is Fu of h (t)
In leaf transformation, filtered output signals r (x, ω) is inputted to microprocessor, and result is shown in lcd.
Due in the present embodiment, wherein two power cables have only been taken to illustrate, then for many electric power electricity
For cable, power cable and another Unidentified power cable that will identify that are compared, and compare both amplitudes, until
Find the power cable corresponding to signal amplitude maximum, as known power cable.
Further, also include step 5, after identifying power cable, determine the length of power cable, method particularly includes:
L=(δ t-ts) v, wherein: l is the length identifying cable;V is ultrasonic signal spread speed in the cable;ts
For the intrinsic system delay of signal emission module and signal receiving module;δ t shakes for the linear frequency modulation that signal emission module sends
Dynamic signal and the time difference of receipt signal, wherein
l1、l2Represent power cable known to length, δ t1Represent cable l1
Middle pumping signal and the time difference of receipt signal, δ t2Represent cable l2Middle pumping signal and the time difference of receipt signal.
Two known length are taken to be respectively l1And l2Cable, tested using this device, linear frequency modulation vibration signal exists
First gps clock module pulse per second (PPS) rising edge output, information processing and decoder module end are in the 2nd gps clock module pulse per second (PPS)
Rise along starting a/d switching controller, clock control signal clk is sent by a/d switching controller, control the work of a/d converter, and
Transformation result is carried out matched filtering, filter result is sequentially stored in twoport ram.Microprocessor search matched filtering result is maximum
It is worth corresponding sequence number n1、n2, the time difference recording two cables respectively is δ t1=n1·tsWith δ t2=n2·ts, tsAdopt for ad
The sample cycle, thus following equations group can be obtained:
Solve: The length of cable can be obtained accordingly;
A kind of power cable personal identification method based on ultrasonic wave proposed by the present invention and device, for complicated electricity
Power cable is differentiated, by processing to echo-signal, thus identifying the cable and its length that need to change.
In the present embodiment, the length of cable is obtained using time difference method,
1) l=(δ t-ts) v, wherein: l is the length of detection cable;V is ultrasonic signal spread speed in the cable;ts
The inherent delay time for signal emission module and signal receiving module;δ t is to send pumping signal, and that is, signal emission module is sent out
The linear frequency modulation vibration signal going out and the time difference of receipt signal, the time difference that is, gps clock records.
2) system delay tsWith asking for of speed v:
Two known length are taken to be respectively l1And l2Cable, tested using this device, linear frequency modulation vibration signal exists
Gps clock pulse per second (PPS) rising edge exports, and information processing starts second with decoder module end in gps clock pulse per second (PPS) rising edge and can compile
A/d switching controller in journey logical device fpga, sends clock control signal clk by a/d switching controller, controls a/d to turn
Parallel operation works, and transformation result is carried out matched filtering, and filter result is sequentially stored in twoport ram.Microprocessor search coupling
Corresponding sequence number n of filter result maximum1、n2, recording the time difference that signal propagates in two cables respectively is δ t1=n1·
tsWith δ t2=n2·ts, tsFor the ad sampling period, thus following equations group can be obtained:
Solve: The length of cable can be obtained accordingly.
And the present invention without destroy cable it is adaptable to any thickness power cable identification.
Simple, with low cost, easy to use, the easy realization of structure.
Safe, danger will not be brought to cable itself and testing staff in detection process.
Reliability is high, in one section of cable plus ultrasonic signal, has added the relatively other electricity of cable corresponding to signal in the other end
The signal energy of cable is the strongest, and after matched filter, the energy having added ultrasonic signal cable is apparently higher than other cable signals
Energy.
The present invention can effectively differentiate the cable that need to change, and has a good application prospect.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention it is clear that those skilled in the art
Member the present invention can be carried out various change and modification without departing from the spirit and scope of the present invention.So, if the present invention
These modifications and modification belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to comprise these
Including change and modification.
Claims (8)
1. a kind of power cable identity recognition device based on ultrasonic wave it is characterised in that: include signal emission module, signal and connect
Receive module and information processing and decoder module;
Described signal emission module, is coupled with one end of wherein power cable to be identified, at equal intervals one tool of timing transmitting
There is the linear frequency modulation vibration signal of CF;
Described signal receiving module, this signal receiving module is coupled with the other end of each power cable to be identified respectively, uses
There is the linear frequency modulation vibration signal of CF in reception;
Described information is processed and decoder module, is connected with signal receiving module, for having the linear of CF to receive
Frequency modulation vibration signal carries out matched filtering, completes power cable identification.
2. a kind of power cable identity recognition device based on ultrasonic wave according to claim 1 it is characterised in that: described
Signal emission module includes linear frequency modulation vibration signal generation module, transmitting ultrasonic transducer and a gps clock module, institute
State linear frequency modulation vibration signal generation module in the presence of a gps clock module pulse per second (PPS), timing at equal intervals is launched linearly
Frequency modulation vibration signal acts on transmitting ultrasonic transducer, this transmitting ultrasonic transducer power cable to be identified with each respectively
One end coupling.
3. a kind of power cable identity recognition device based on ultrasonic wave according to claim 2 it is characterised in that: described
Signal receiving module includes several with the transmitting reception ultrasonic transducer that mate of ultrasonic transducer with to reception ultrasonic transducer
The programmable amplifier that is amplified of output signal, described several receive the another of ultrasonic transducers and power cable to be identified
End coupling, each receives ultrasonic transducer and corresponds to a power cable to be identified.
4. a kind of power cable identity recognition device based on ultrasonic wave according to claim 3 it is characterised in that: described
Filtration module that information processing and decoder module include being sequentially connected, a/d converter, the second PLD fpga and the
Two microprocessors;Described filtration module is connected with programmable amplifier, for being filtered to the signal after amplifying;Described a/d turns
Parallel operation is used for for filtered signal being converted into data signal;Described second PLD fpga is used for data signal
Carry out matched filtering, described second microprocessor is connected with the second PLD fpga, according to matched filtering result, complete
Become power cable identification.
5. a kind of power cable identity recognition device based on ultrasonic wave according to claim 4 it is characterised in that: described
Information processing and decoder module also include the 2nd gps clock module, described 2nd gps clock module respectively with the second microprocessor
Device, the second PLD fpga connect.
6. a kind of power cable identity recognition device based on ultrasonic wave according to claim 5 it is characterised in that: this electricity
Power cable identity identifying device also includes display module, and described display module is connected with the second microprocessor, for display positioning
Result.
7. a kind of power cable personal identification method based on ultrasonic wave it is characterised in that: comprise the following steps:
Signal emission module is coupled by step 1. with one end of wherein power cable to be identified, and uses this signal emission module
Produce a linear frequency modulation vibration signal with CF;
Signal receiving module is coupled by step 2. respectively with the other end of each power cable to be identified, and receives power cable
Echo-signal;
Step 3. information processing and decoder module carry out matched filtering to the echo-signal receiving, according to matched filtering result pair
Signal is analyzed, and the power cable corresponding to signal amplitude maximum is identified power cable.
8. a kind of power cable personal identification method based on ultrasonic wave according to claim 7 it is characterised in that: also wrap
Include step 4, after identifying power cable, determine the length of power cable, method particularly includes:
L=(δ t-ts) v, wherein: l is the length identifying cable;V is ultrasonic signal spread speed in the cable;tsFor letter
Number transmitter module system delay intrinsic with signal receiving module;The linear frequency modulation vibration letter that δ t sends for signal emission module
Time difference number with receipt signal, wherein
l1、l2Represent power cable known to 2 length, δ t1Represent cable l1In
Pumping signal and the time difference of receipt signal, δ t2Represent cable l2Middle pumping signal and the time difference of receipt signal.
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CN107329039B (en) * | 2017-08-30 | 2020-09-04 | 国网安徽省电力公司检修公司 | Cable alignment method based on ultrasonic signal processing |
CN111307956B (en) * | 2019-12-19 | 2023-08-01 | 中国航空工业集团公司北京长城航空测控技术研究所 | Guided wave signal excitation circuit based on linear frequency modulation signal |
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US4523468A (en) * | 1983-10-03 | 1985-06-18 | Trw Inc. | Phased array inspection of cylindrical objects |
JP2782164B2 (en) * | 1994-10-05 | 1998-07-30 | 川崎重工業株式会社 | Method and apparatus for differentiating underground objects |
EP2105737A1 (en) * | 2008-03-25 | 2009-09-30 | Nederlandse Organisatie voor toegepast-natuurwetenschappelijk Onderzoek TNO | System for ultrasonically detecting defects in a pipe wall |
CN101539541B (en) * | 2009-04-09 | 2011-01-05 | 上海交通大学 | Detection method of thick beam structure damage based on guide wave |
CN102749386B (en) * | 2011-04-19 | 2015-01-28 | 香港科技大学 | System and method for in-situ hydration monitoring and damage detection of concrete structure and sensors used by system and method |
CN102590343B (en) * | 2012-02-23 | 2013-10-02 | 河海大学常州校区 | Device and method for ultrasonically inspecting grouting compactness of corrugated pipe duct |
CN204346986U (en) * | 2015-01-15 | 2015-05-20 | 重庆大学 | A kind of based on hyperacoustic power cable identity recognition device |
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