CN104515809A - 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 PDF

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Publication number
CN104515809A
CN104515809A CN201510020386.7A CN201510020386A CN104515809A CN 104515809 A CN104515809 A CN 104515809A CN 201510020386 A CN201510020386 A CN 201510020386A CN 104515809 A CN104515809 A CN 104515809A
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signal
power cable
module
identified
cable
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CN104515809B (en
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王平
龚志辉
程娜
潘震
杜炜
李娜
李刚建
王思奇
王哲
蒋彦韬
钟蕊霜
屈子琪
王军
燕罗成
雷林
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Chongqing University
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Chongqing University
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  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

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

A kind of based on hyperacoustic power cable identity recognition device and method
Technical field
The present invention relates to Ultrasonic Detection and analysis technical field, be specifically related to a kind of based on hyperacoustic power cable personal identification method and device.
Background technology
Underground power cable refers to the electrical lead of the below ground that is laid in, because underground pipe network is complicated, and the direct-buried cable had is under frozen soil layer, when underground power cable is damaged due to the various external world or immanent cause, because it is in below ground, human eye is difficult to identify, adds that power cable also can be wound around due to the reason of construction, and underground power cable identification is strengthened with replacing work difficulty.Go back the method and apparatus that neither one conveniently identifies underground power cable at present.
Summary of the invention
Given this, the object of this invention is to provide a kind of based on hyperacoustic power cable identity recognition device and method, this device has the linear frequency modulation vibration signal of characteristic frequency by launching, and the wave filter matched combines, the cable that the every root of accurate identification is different, 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, the object of the invention is to be achieved through the following technical solutions, a kind of based on hyperacoustic power cable identity recognition device, comprise signal emission module, signal receiving module, information processing and decoder module and data analysis module;
Described signal emission module, with the coupled one end of a wherein power cable to be identified, launches for timing at equal intervals the linear frequency modulation vibration signal that has characteristic frequency;
Described signal receiving module, the other end of this signal receiving module power cable to be identified with each is respectively coupled, for receiving the signal of power cable to be identified;
Described information processing and decoder module, be connected with signal receiving module, for carrying out matched filtering to the signal received, completes power cable identification.
Further, described signal emission module comprises linear frequency modulation vibration signal generation module, launches ultrasonic transducer and the first gps clock module, described linear frequency modulation vibration signal generation module is under the effect of the first gps clock module pulse per second (PPS), timing transmitting linear frequency modulation vibration signal acts on transmitting ultrasonic transducer, the coupled one end of the power cable that this transmitting ultrasonic transducer is to be identified with each respectively at equal intervals.
Further, described signal receiving module comprises several and launches the reception ultrasonic transducer that ultrasonic transducer mates and the programmable amplifier amplified the output signal receiving ultrasonic transducer, described several receive ultrasonic transducer and are coupled with the other end of power cable to be identified, the corresponding power cable to be identified of each reception ultrasonic transducer.
Further, described process and decoder module comprise and are connected filtration module, A/D converter, the second programmable logic device (PLD) FPGA and the second microprocessor successively; Described filtration module is connected with control journey amplifier, for carrying out filtering to the signal after amplification; Described A/D converter is used for converting filtered signal to digital signal; Described second programmable logic device (PLD) FPGA is used for carrying out matched filtering to digital signal, and described second microprocessor is connected with the second programmable logic device (PLD) FPGA, according to matched filtering knot root, completes power cable identification.
Further, described information processing and decoder module also comprise the second gps clock module, and described second gps clock module is connected with the second microprocessor, the second programmable logic device (PLD) FPGA respectively.
Further, this power cable identity recognition device and method also comprise display module, and described display module is connected with the second microprocessor, for showing positioning result.
Two of object of the present invention is to provide a kind of based on hyperacoustic power cable personal identification method, comprises the following steps:
Step 1. by the coupled one end of signal emission module with a wherein power cable to be identified, and produces by this signal emission module the linear frequency modulation vibration signal that has characteristic frequency;
The other end of signal receiving module power cable to be identified with each is respectively coupled by step 2., and receives the linear frequency modulation vibration signal with characteristic frequency of power cable transmission;
Step 3. information processing and decoder module carry out matched filtering to the echoed signal received, and analyze signal according to matched filtering result, and the maximum corresponding power cable of signal amplitude is identified power cable.
Further, also comprise step 4, after identifying power cable, determine the length of power cable, concrete grammar is:
L=(Δ t-t s) v, wherein: L is the length identifying cable; V is ultrasonic signal velocity of propagation in the cable; t sfor signal emission module and the intrinsic system delay of signal receiving module; Δ t is the mistiming of the linear frequency modulation vibration signal that sends of signal emission module and Received signal strength, wherein
l 1, L 2represent the power cable that length is known, Δ t 1represent cable L 1the mistiming of middle pumping signal and Received signal strength, Δ t 2represent cable L 2the mistiming of middle pumping signal and Received signal strength.
Owing to have employed technique scheme, the present invention has following advantage:
The one that the present invention proposes, based on hyperacoustic power cable identity recognition device and method, for differentiating the power cable of complexity, need not be destroyed cable, being applicable to the identification of the power cable of any thickness.Structure is simple, with low cost, safe and efficient, can not bring danger in testing process to cable itself and testing staff.Reliability is high, ultrasonic signal is added on one section, cable, the signal energy receiving cable other cable relative corresponding to ultrasonic vibration signal at the other end is the strongest, after matched filter, has added the energy of energy apparently higher than other cable signal of ultrasonic signal cable.The present invention fast and effeciently can differentiate the cable that need change, and has a good application prospect.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is a kind of structural representation based on hyperacoustic power cable identity recognition device of the present invention;
Fig. 2 is the system chart that linear frequency modulation vibration signal of the present invention produces and launches;
Fig. 3 is the coupling scheme 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.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment only in order to the present invention is described, instead of in order to limit the scope of the invention.
As shown in Figure 1, a kind of based on hyperacoustic power cable identity recognition device, comprise signal emission module, signal receiving module, information processing and decoder module and display module;
Described signal emission module, with the coupled one end of a wherein power cable to be identified, the linear frequency modulation vibration signal that has characteristic frequency is launched in timing at equal intervals;
Described signal receiving module, the other end of this signal receiving module power cable to be identified with each is respectively coupled, for receiving the signal of power cable to be identified;
Described information processing and decoder module, be connected with signal receiving module, for carrying out matched filtering to the signal received, completes power cable identification;
Described display module is connected to information processing and decoder module, for showing positioning result.
As Fig. 2, 3, shown in 4, described signal emission module comprises linear frequency modulation vibration signal generation module, launch ultrasonic transducer and gps clock module, specifically, linear frequency modulation vibration signal generation module comprises first microprocessor (MCU) and the first programmable logic device (PLD) (FPGA), first microprocessor is connected with the first programmable logic device (PLD), gps clock module is connected with microprocessor by serial ports, the pulse per second (PPS) that gps clock module sends acts on the first programmable logic device (PLD), linear frequency modulation vibration signal is launched in timing at equal intervals, after analog to digital conversion and high drive, act on transmitting ultrasonic transducer, launch the linear frequency modulation vibration signal of preset frequency and feature.
Described signal receiving module comprises several reception ultrasonic transducers mated with transmitting ultrasonic transducer, and to the programmable amplifier that the output signal receiving ultrasonic transducer is amplified, described several receive ultrasonic transducer and are coupled with the other end of power cable to be identified, the corresponding power cable to be identified of each reception ultrasonic transducer.
In the present embodiment, launch the plane of ultrasonic transducer and the cross section close-coupled of power cable to be identified, from then on ultrasound wave is launched in direction, and this coupling scheme can make the ultrasonic signal energy better receiving end ultrasonic transducer of transmitting receive; Receive ultrasonic transducer to be also coupled at the other end of power cable in the same way, receive ultrasonic echo.
Described process and decoder module comprise and are connected filtration module, A/D converter, the second programmable logic device (PLD) FPGA, the second microprocessor and the second gps clock module successively; Described second gps clock module is connected with the second microprocessor, the second programmable logic device (PLD) FPGA respectively, and the second gps clock module sends pulse per second (PPS) and acts on the second programmable logic device (PLD) FPGA.Described filtration module is connected with control journey amplifier, for carrying out filtering to the signal after amplification; Described A/D converter is used for converting filtered signal to digital signal; Described second programmable logic device (PLD) FPGA is used for carrying out matched filtering to digital signal, and described second microprocessor is connected with the second programmable logic device (PLD) FPGA, according to matched filtering result, completes power cable identification.Second microprocessor calculates the size of the amplitude receiving ultrasonic transducer Received signal strength according to the Output rusults of matched filter, the power cable corresponding to amplitude maximum is identified power cable.
Based on the design philosophy of said apparatus, the invention provides a kind of based on hyperacoustic power cable personal identification method, specifically comprise the following steps:
Step 1. by the coupled one end of signal emission module with a wherein power cable to be identified, and produces by this signal emission module the linear frequency modulation vibration signal that has characteristic frequency.
In this step, the expression formula of linear frequency modulation vibration signal is:
p ( t ) = a ( t ) · exp [ j 2 π ( f 0 t + B 2 T t 2 ) ] - T 2 ≤ t ≤ T 2 , Wherein, a (t) is amplitude modulation(PAM) function, and native system adopts rectangular window function f 0for signal center frequency, T is signal duration, and B is bandwidth.Instantaneous frequency is: the instantaneous frequency that visible linear frequency modulation vibration signal has this linear, inswept scope is [f 0-B/2, f 0+ B/2], this scope is designated as Δ f, the pulse compression ratio that can obtain linear frequency modulation system is: CR=T × Δ f, therefore, we when inswept frequency range Δ f is constant, can increase the duration of signal, improve the ratio of compression of pulse signal, thus improve the signal to noise ratio (S/N ratio) of system, promote the reliability detected.
In the present embodiment, f 0=50KHz, T=1ms, B=30KHz.
The other end of signal receiving module power cable to be identified with each is respectively coupled by step 2., and receives the linear frequency modulation vibration signal of power cable transmission, in the present embodiment, conveniently calculates, gets two-way power cable and be described.
Step 3. information processing and decoder module carry out matched filtering to the linear frequency modulation vibration signal received, and analyze signal according to matched filtering result, and the maximum corresponding power cable of signal amplitude is identified power cable.
The signal that two-way receives ultrasonic transducer reception inputs to FPGA after programmable amplifier amplification, low-pass filtering, A/D conversion, in FPGA, receive linear frequency modulation vibration signal r to two-way transducer 1(x, t), r 2(x, t) does Fourier transform, obtains its frequency spectrum r 1(x, ω), r 2(x, ω) delivers to follow-up matched filter and carries out matched filtering, and matched filter realizes in FPGA inside.
In the present embodiment, the implementation method of matched filtering is:
1) signal to noise ratio snr is defined as: wherein r mt () is the output signal of wave filter, P nit is average noise power.If the transport function of passive filter is H (f), signal by amplitude after this wave filter is: r herein if frequency spectrum that () is input signal.After this wave filter, noise power spectrum is: p herein 0for noise power spectrum.
2) by Shi Waxin then inequality can obtain SNR ≤ ∫ - ∞ ∞ | R i ( f ) | 2 df P 0 , When H ( f ) = G a R i * ( f ) e - 2 jπ ft 1 Time, obtain equal sign, now corresponding wave filter is matched filter, G aget 1, its impulse response is the mirror image of input signal, but is shifted t on a timeline 1, be: h (t)=G ar i(t 1-t), know that matched filter can obtain maximum signal to noise ratio (S/N ratio) thus.
3) spectrum signal obtained by FPGA process is input in matched filter again carries out matched filtering process: the signal after matched filtering is R (x, ω)=r i(x, ω) H (ω) i=1,2, r i(x, ω) is input signal, and the Fourier transform that H (ω) is h (t), inputs to microprocessor by filtered output signals R (x, ω), and by result display in an lcd.
Due in the present embodiment, only get wherein two power cables to be described, so for many power cables, the power cable identified and the Unidentified power cable of another root are compared, amplitude relatively, until find the maximum corresponding power cable of signal amplitude, be known power cable.
Further, also comprise step 5, after identifying power cable, determine the length of power cable, concrete grammar is:
L=(Δ t-t s) v, wherein: L is the length identifying cable; V is ultrasonic signal velocity of propagation in the cable; t sfor signal emission module and the intrinsic system delay of signal receiving module; Δ t is the mistiming of the linear frequency modulation vibration signal that sends of signal emission module and Received signal strength, wherein
l 1, L 2represent the power cable that length is known, Δ t 1represent cable L 1the mistiming of middle pumping signal and Received signal strength, Δ t 2represent cable L 2the mistiming of middle pumping signal and Received signal strength.
Get two known length and be respectively L 1and L 2cable, this device is utilized to test, linear frequency modulation vibration signal exports at the first gps clock module pulse per second (PPS) rising edge, information processing and decoder module end start A/D switching controller at the second gps clock module pulse per second (PPS) rising edge, clock control signal CLK is sent by A/D switching controller, control A/D converter works, and transformation result is carried out matched filtering, and filter result is successively stored in dual port RAM.The sequence number N that microprocessor search matched filtering result maximal value is corresponding 1, N 2, the mistiming recording two cables is respectively Δ t 1=N 1t swith Δ t 2=N 2t s, T sfor the AD sampling period, thus following equations group can be obtained:
L 1 = ( Δt 1 - t d ) v L 2 = ( Δt 2 - t d ) v
Solve: t d = Δt 1 L 2 - Δt 2 L 1 L 2 - L 1 , v = L 2 - L 1 Δt 2 - Δt 1 , The length of cable can be obtained accordingly;
The one that the present invention proposes, based on hyperacoustic power cable personal identification method and device, for differentiating the power cable of complexity, by processing echoed signal, thus identifies the cable and length thereof that need change.
In the present embodiment, time difference method is adopted to obtain the length of cable,
1) L=(Δ t-t s) v, wherein: L is the length of detection streamer; V is ultrasonic signal velocity of propagation in the cable; t sfor the inherent delay time of signal emission module and signal receiving module; Δ t for sending pumping signal, i.e. the mistiming of the linear frequency modulation vibration signal that sends of signal emission module and Received signal strength, i.e. mistiming of recording of gps clock.
2) system delay t swith asking for of speed v:
Get two known length and be respectively L 1and L 2cable, this device is utilized to test, linear frequency modulation vibration signal exports at gps clock pulse per second (PPS) rising edge, information processing and decoder module end start the A/D switching controller in the second programmable logic device (PLD) FPGA at gps clock pulse per second (PPS) rising edge, clock control signal CLK is sent by A/D switching controller, control A/D converter works, and transformation result is carried out matched filtering, and filter result is successively stored in dual port RAM.The sequence number N that microprocessor search matched filtering result maximal value is corresponding 1, N 2, recording the mistiming that signal propagates in two cables is respectively Δ t 1=N 1t swith Δ t 2=N 2t s, T sfor the AD sampling period, thus following equations group can be obtained:
L 1 = ( Δt 1 - t d ) v L 2 = ( Δt 2 - t d ) v
Solve: t d = Δt 1 L 2 - Δt 2 L 1 L 2 - L 1 , v = L 2 - L 1 Δt 2 - Δt 1 , The length of cable can be obtained accordingly.
And the present invention need not destroy cable, be applicable to the identification of the power cable of any thickness.
Structure is simple, with low cost, easy to use, easily realize.
Security is high, can not bring danger in testing process to cable itself and testing staff.
Reliability is high, adds ultrasonic signal on one section, cable, and the signal energy having added cable other cable relative corresponding to signal at the other end is the strongest, after matched filter, has added the energy of energy apparently higher than other cable signal of ultrasonic signal cable.
The present invention effectively can differentiate the cable that need 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, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (8)

1. based on a hyperacoustic power cable identity recognition device, it is characterized in that: comprise signal emission module, signal receiving module and information processing and decoder module;
Described signal emission module, with the coupled one end of a wherein power cable to be identified, the linear frequency modulation vibration signal that has characteristic frequency is launched in timing at equal intervals;
Described signal receiving module, the other end of this signal receiving module power cable to be identified with each is respectively coupled, for receiving the linear frequency modulation vibration signal with characteristic frequency;
Described information processing and decoder module, be connected with signal receiving module, for carrying out matched filtering to the linear frequency modulation vibration signal with characteristic frequency received, completes power cable identification.
2. one according to claim 1 is based on hyperacoustic power cable identity recognition device, it is characterized in that: described signal emission module comprises linear frequency modulation vibration signal generation module, launches ultrasonic transducer and the first gps clock module, described linear frequency modulation vibration signal generation module is under the effect of the first gps clock module pulse per second (PPS), timing transmitting linear frequency modulation vibration signal acts on transmitting ultrasonic transducer, the coupled one end of the power cable that this transmitting ultrasonic transducer is to be identified with each respectively at equal intervals.
3. one according to claim 2 is based on hyperacoustic power cable identity recognition device, it is characterized in that: described signal receiving module comprises several and launches the reception ultrasonic transducer that ultrasonic transducer mates and the programmable amplifier amplified the output signal receiving ultrasonic transducer, described several receive ultrasonic transducer and are coupled with the other end of power cable to be identified, the corresponding power cable to be identified of each reception ultrasonic transducer.
4. one according to claim 3 is based on hyperacoustic power cable identity recognition device, it is characterized in that: described information processing and decoder module comprise and be connected filtration module, A/D converter, the second programmable logic device (PLD) FPGA and the second microprocessor successively; Described filtration module is connected with control journey amplifier, for carrying out filtering to the signal after amplification; Described A/D converter is used for converting filtered signal to digital signal; Described second programmable logic device (PLD) FPGA is used for carrying out matched filtering to digital signal, and described second microprocessor is connected with the second programmable logic device (PLD) FPGA, according to matched filtering result, completes power cable identification.
5. one according to claim 4 is based on hyperacoustic power cable identity recognition device, it is characterized in that: described information processing and decoder module also comprise the second gps clock module, described second gps clock module is connected with the second microprocessor, the second programmable logic device (PLD) FPGA respectively.
6. want the one described in 5 based on hyperacoustic power cable identity recognition device according to right, it is characterized in that: this power cable identity recognition device also comprises display module, and described display module is connected with the second microprocessor, for showing positioning result.
7., based on a hyperacoustic power cable personal identification method, it is characterized in that: comprise the following steps:
Step 1. by the coupled one end of signal emission module with a wherein power cable to be identified, and produces by this signal emission module the linear frequency modulation vibration signal that has characteristic frequency;
The other end of signal receiving module power cable to be identified with each is respectively coupled by step 2., and receives power cable echoed signal;
Step 3. information processing and decoder module carry out matched filtering to the echoed signal received, and analyze signal according to matched filtering result, and the maximum corresponding power cable of signal amplitude is identified power cable.
8. one according to claim 7 is based on hyperacoustic power cable personal identification method, it is characterized in that: also comprise step 5, and after identifying power cable, determine the length of power cable, concrete grammar is:
L=(Δ t-t s) v, wherein: L is the length identifying cable; V is ultrasonic signal velocity of propagation in the cable; t sfor signal emission module and the intrinsic system delay of signal receiving module; Δ t is the mistiming of the linear frequency modulation vibration signal that sends of signal emission module and Received signal strength, wherein
l 1, L 2represent the power cable that 2 length is known, Δ t 1represent cable L 1the mistiming of middle pumping signal and Received signal strength, Δ t 2represent cable L 2the mistiming of middle pumping signal and Received signal strength.
CN201510020386.7A 2015-01-15 2015-01-15 Device and method for identifying identities of power cables based on ultrasonic wave Expired - Fee Related CN104515809B (en)

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