CN207798996U - A kind of plane cable fault positioning device - Google Patents
A kind of plane cable fault positioning device Download PDFInfo
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- CN207798996U CN207798996U CN201721712591.0U CN201721712591U CN207798996U CN 207798996 U CN207798996 U CN 207798996U CN 201721712591 U CN201721712591 U CN 201721712591U CN 207798996 U CN207798996 U CN 207798996U
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Abstract
The utility model provides a kind of plane cable fault positioning device, including data processing unit, trigger control unit, UWB burst pulses generate unit, signal condition unit, delay unit, data acquisition unit and CAN interface unit；The UWB burst pulses generate the avalanche type switching characteristic that unit is operated in avalanche region using microwave transistor, in conjunction with the basic functional principle of MARX circuits, generate the burst pulse transmitting signal of ns grades of rising edges and are sent to cable under test.The utility model is that cable under test injects narrow-band impulse using low voltage pulse reflection method, pulse echo signal is acquired using equivalent sampling, gathered data is handled by DSP, realize the quick and precisely positioning to Method of Cable Trouble Point to be measured, to reduce the mistake dismounting number in maintenance work, it avoids leading to the reduction of cable life because of mistake dismounting, and not by ambient noise interference.
Description
Technical field
The utility model is related to aeronautical engineering fault diagnosis field of non destructive testing, more particularly to a kind of plane cable fault is fixed
Position device.
Background technology
Plane cable fault positioning is an important content of engineering maintenance.Aircraft Cables type is complicated, there is various radio frequencies
Line, data line, low-voltage-powered line etc., and cable length is shorter, and each position of aircraft is spread all over like " blood vessel ", often presses class
It is not placed in the double wall of aircraft by bundled, artificial judgment fault point is very inconvenient.Currently, the special inspection used in engineering maintenance
Measurement equipment mainly uses the time domain reflectometer of import, and this equipment limitation is strong, mainly effective to radio frequency coaxial-cable, valence
Lattice are expensive, and the country only has several major repair bases to possess this measuring instrument, and people then depends on mostly in remaining maintenance department
Work positions.
Relative to other field, the characteristics of fault location of Aircraft Cables has its own：(1) fault type is generally all short-circuit
Or open circuit；(2) cable can not be damaged during fault location；(3) cable length is shorter, and positioning accuracy request is high.
Currently, the method for common cable fault positioning mainly has：Bridge method, HVDC flashover m ethod, impulse HV flashover method, sounding
Method, sound magnetic-synchro method etc..Bridge method cannot directly detect high resistive fault, survey fragile cable under test when high resistive fault；Based on sudden strain of a muscle
A kind of method of network is generally used for high resistive fault detection, is unsuitable for short trouble positioning；Sound detection harmony magnetic-synchro method all easily by
Ambient noise interference.
Utility model content
(1) the technical issues of solving
To solve the above-mentioned problems, the utility model provides a kind of plane cable fault positioning device, using low-tension pulse
Shooting method is rushed, the fault point of cable under test is quick and precisely positioned, to reduce the mistake dismounting number in maintenance work, is kept away
Exempt to lead to the reduction of cable life because of mistake dismounting, and not by ambient noise interference.
(2) technical solution
A kind of plane cable fault positioning device, including data processing unit, trigger control unit, UWB burst pulses generate
Unit, signal condition unit, delay unit, data acquisition unit and CAN interface unit；The UWB burst pulses generate unit profit
It is operated in the avalanche type switching characteristic of avalanche region with microwave transistor, in conjunction with the basic functional principle of MARX circuits, generates ns grades
The burst pulse transmitting signal of rising edge is simultaneously sent to cable under test；The fault point of the cable under test, which emits the burst pulse, believes
It number reflects, the echo-signal that the signal conditioning circuit receives transmitting simultaneously carries out limited range enlargement and range switching, output difference
Sub-signal is sent into the data acquisition unit；The trigger control unit generates the UWB burst pulses and generates touching for cell operation
It signals, while the trigger control unit generates the enabling signal of each pulse recurrence interval of the data acquisition unit, and
The pulse recurrence interval is counted；The trigger control unit export delays time to control amount give the delay unit, it is described
Delay unit is delayed accordingly to next pulse recurrence interval according to the delays time to control amount；The data are adopted
Collect unit to carrying out equivalent sampling through the signal condition unit treated echo received signal, collection result is sent into the number
According to processing unit；The data processing unit handles the data of acquisition, calculates the position of failure point of the cable under test；
The data processing unit carries out communication with host computer by the CAN interface unit and connect, and receives the test of the host computer
Instruction, and send result of calculation to the host computer；
It includes the first~the 4th transistor, the first~the 8th rheostat, the first~the 8th that the UWB burst pulses, which generate unit,
Capacitance and first~thirteenth resistor, wherein the described first~the 4th transistor is NPN type triode；Described first~the 4th is brilliant
The base stage of body pipe is connected with the trigger signal caused by the trigger control unit；
The signal condition unit includes first~third operational amplifier, the first and second field-effect tube, the first~the
Three switches, the 14th~the 26th resistance, the 9th and the tenth capacitance, wherein first and second operational amplifier selects electricity
Feedback-type amplifier AD8000 is flowed, the third operational amplifier selects difference amplifier AD4937, first field-effect tube
For N ditch technotrons, second field-effect tube is P ditch technotrons；First and second field-effect tube pair
The echo received signal carries out amplitude limit, and first operational amplifier constitutes emitter following circuit, the second operational amplifier and
The range that first~third switch constitutes adjustable gain switches amplifying circuit, and the third operational amplifier constitutes single-ended difference
Parallel circuit, output adapt to the differential signal of the data acquisition unit.
Further, the data acquisition unit selects A/D converter AD9215-105.
Further, the delay unit selects delay chip MC100EP196.
Further, the data processing unit selects digital signal processor TMS320F2812.
Further, the CAN interface unit selects CAN isolated transceivers CTM8251AT.
(3) advantageous effect
The utility model provides a kind of plane cable fault positioning device, is cable under test using low voltage pulse reflection method
Narrow-band impulse is injected, pulse echo signal is acquired using equivalent sampling, gathered data is handled by DSP, it is real
Now the quick and precisely positioning of Method of Cable Trouble Point to be measured is avoided tearing open because of mistake to reduce the mistake dismounting number in maintenance work
Dress leads to the reduction of cable life, and not by ambient noise interference, simple in structure, and accuracy of detection is high, fast response time, resists dry
It is strong to disturb ability, stability and good reliability are with good expansibility.
Description of the drawings
Fig. 1 is a kind of system structure diagram of plane cable fault positioning device involved by the utility model.
Fig. 2 is that a kind of UWB burst pulses of plane cable fault positioning device involved by the utility model generate unit electricity
Road schematic diagram.
Fig. 3 is a kind of signal condition unit circuit theory of plane cable fault positioning device involved by the utility model
Figure.
Specific implementation mode
The embodiment involved by the utility model is described in further details below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of plane cable fault positioning device, including data processing unit, trigger control unit, UWB
Burst pulse generates unit, signal condition unit, delay unit, data acquisition unit and CAN interface unit；UWB burst pulses generate
Unit is operated in the avalanche type switching characteristic of avalanche region using microwave transistor, in conjunction with the basic functional principle of MARX circuits, production
The burst pulse transmitting signal of raw ns grades of rising edges is simultaneously sent to cable under test；The fault point of cable under test emits signal to burst pulse
It reflects, signal conditioning circuit receives the echo-signal of transmitting and carries out limited range enlargement and range switching, output difference signal
It is sent into data acquisition unit；Trigger control unit generates UWB burst pulses and generates the trigger signal of cell operation, while triggering control
Unit generates the enabling signal of each pulse recurrence interval of data acquisition unit, and is counted to pulse recurrence interval；Triggering
Control unit exports delays time to control amount to delay unit, and delay unit is according to delays time to control amount, to next pulse recurrence interval
It is delayed accordingly；Data acquisition unit to carrying out equivalent sampling through signal condition unit treated echo received signal,
Collection result is sent into data processing unit；Data processing unit handles the data of acquisition, calculates the failure of cable under test
Point position；Data processing unit carries out communication with host computer by CAN interface unit and connect, and receives the test instruction of host computer,
And send result of calculation to host computer.
To cable under test send a pulse voltage signal, when cable under test in the event of failure, due to failure point impedance and electricity
The characteristic impedance of cable mismatches and generates pulse-echo, the timing since emitting pulse, until receiving fault point reflected impulse
Time be Δ t, Δ t is the time of pulse round trip between test point and fault point.If fault distance is s, pulse exists
Spread speed in cable under test is v, then s=v × Δ t/2.By the initial position of perception reflex pulse, shape and amplitude,
The distance of fault point, the starting point of the position of fault point in reflected impulse.
Using above-mentioned low voltage pulse reflection method, sends pulse and should be the burst pulse with ns grades of rising edges.As shown in Fig. 2,
It includes transistor Q1~Q4, rheostat Rw1~Rw8, capacitance C1~C8 and resistance R1~R13 that UWB burst pulses, which generate unit, wherein
Transistor Q1~Q4 is NPN type triode.UWB burst pulses generate the avalanche type that unit is operated in avalanche region using microwave transistor
Switching characteristic, in conjunction with the basic functional principle of MARX circuits.It is delayed successively to eliminate snowslide present in circuit, in circuit
The base stage of transistor Q1~Q4 adds synchronous triggering signal, makes transistor Q1~Q4 while generating avalanche breakdown, accelerates negative
The uphill process for carrying the pulse obtained on R13, obtains very steep UWB burst pulses.Pulse width is about 500ps, is risen
Time is about 600ps, and fall time is about 1600ps, and amplitude is about 24V.
UWB burst pulses emit signal after the failure point reflection of cable under test, and pulse echo signal is by signal condition unit
It is received.Signal condition unit mainly realizes that range switches, and echo received signal is made to meet data acquisition unit
It is required that.As shown in figure 3, signal condition unit includes operational amplifier U1~U3, field-effect tube T1 and T2, switch K1~K3, electricity
R14~R26, capacitance C9 and C10 are hindered, wherein operational amplifier U1 and U2 select current feedback amplifier AD8000, operation to put
It is N ditch technotrons that big device U3, which selects difference amplifier AD4937, field-effect tube T2, and field-effect tube T2 is P ditch junction types field
Effect pipe.Since the position of cable under test open circuit or short circuit is different, ns grades of echo pulse signal amplitude variation range is larger, can
It can reach 20V or more.In order to avoid generating damage to the FLU Fault Location Unit of cable under test, pass through field-effect first in circuit
Pipe T1 and T2 carries out amplitude limit to the echo pulse signal of input.Meanwhile in order to improve the input impedance of equipment, operational amplifier U1
Constitute emitter following circuit.The maximum input range of A/D converter is 2Vp-p, and in order to allow echo-signal most preferably to turn in A/D
It changes area to be acquired, the range of operational amplifier U2 and switch K1~K3 composition adjustable gains switches amplifying circuit so that for
The smaller signal of echo amplitude can be identified effectively.If it is too small to acquire signal amplitude, affected by noise, collection result error
It will be larger, it is therefore desirable to signal amplitude be judged first, if the signal amplitude of acquisition carries out range all less than 1V
Switching, until signal amplitude is met the requirements.In order to adapt to the requirement of A/D converter differential signal input, operational amplifier U3 structures
At single-ended transfer difference circuit.
Data acquisition unit selects A/D converter AD9215-105, sample frequency 100MHz, each cycle to sample 2us
(200 points), period distances 1ms is acquired 100 times altogether.
It is 1.2GHz that delay unit, which selects delay chip MC100EP196, highest work frequency, and the fixed delay of monolithic is
2.4ns, adjustable maximum delay are 10ns, and using 10ps delays as stepping.
Since echo impulse width is ns grades, according to nyquist sampling theorem, to restore echo signal waveform, sampling
Rate wants 2GHz or more, practical operation to get up relatively difficult.In view of echo-signal has repeatability in cable under test, so
Equivalent sampling principle is used in data acquisition unit.The frequency of sampling pulse is 100MHz, in first arteries and veins for being used pulse
It rushes in recurrence interval, sampling pulse samples 200 points.In second pulse recurrence interval, sampling pulse is with respect to first time arteries and veins
It rushes using in recurrence interval and postpones a fixed value 100ps on the burst length.In third pulse recurrence interval, arteries and veins is sampled
Postpone the same fixed value 100ps on the sampling pulse time in punching and opposite second pulse recurrence interval, i.e., with respect to first
A sampling pulse postpones 200ps.And so on, until a complete pulse period sampled, finally successively by sampled point
It lines up according to sample time order and forms a complete waveform.Equivalent sampling rate is 1/100ps=10GHz, and one complete
Sampling number 10ns/100ps × 2us/10ns=20000 in total in whole pulse waveform.It can be seen that real-time sampling rate is
The sampling pulse of 10MHz can be equivalent to the real-time sampling rate of 10GHz after equivalent transformation, can survey 160m~230m away from
From, it is sufficient to meet the requirement of Aircraft Cables length.
When receiving the startup trigger signal of data processing unit, it is 100MHz that trigger control unit, which will generate frequency, and
Continue the sampled signal of 2us, after this signal is postponed by delay cell, data acquisition unit adopts input signal
Collection, to complete the acquisition of a pulse recurrence interval.After each pulse recurrence interval acquisition, trigger control unit will produce
Raw incremental 100ps controls signal to delay unit, to prepare the acquisition of next pulse recurrence interval.Delay unit is according to tactile
Send out the delays time to control amount of control unit output, the delay that will be responded to the sampling clock in next pulse recurrence interval.By
In there are constant time lags, it will had an impact to the accuracy of cable fault to be measured positioning, it is therefore desirable to use standard cable pair
Hardware delay is calibrated, to improve the accuracy of fault location.
Enabling signal of the trigger control unit by generating each pulse recurrence interval and based on carrying out to pulse recurrence interval
Number.After receiving the startup test signal of data processing unit, timing is carried out as unit of 1ms, at each whole ms moment, together
When triggering UWB burst pulses generate unit and data acquisition unit work, it is primary complete to complete until accumulative 100 operations
Equivalent sampling process control.
Data processing unit carries out data processing, calculates the position of failure point of cable under test, and by CAN bus with it is upper
Machine interacts.It includes 128K × 16bit's that data processing unit, which selects digital signal processor TMS320F2812, the DSP,
Flash storage, the SRAM of 18K × 16bit have 150MHz clock frequencies, 16bit × 16bit and 32bit × 32bit's
Multiply and accumulation operations, code efficiency is high, and with enhanced eCAN controller modules etc., can be directly realized by and CAN bus
Data communication.The major function of CAN interface unit is the differential level for CAN bus by the logic level transition of CAN controller,
CAN interface unit selects CAN isolated transceivers CTM8251AT.CTM8251AT also has between CAN controller and CAN bus
Buffer action, isolated power supply is up to DC2500V.
After receiving host computer and starting test command, data acquisition unit carries out primary complete equivalent sampling, data
Processing unit is ranked up sampled data according to the time, and carries out amplitude judgement, and data fitting is carried out if meeting the requirements, into
And the rising edge or failing edge (trip point or short dot) of echo pulse signal are found out, and calculate the failure point of cable under test
It sets, result is transmitted to host computer.
The utility model provides a kind of plane cable fault positioning device, is cable under test using low voltage pulse reflection method
Narrow-band impulse is injected, pulse echo signal is acquired using equivalent sampling, gathered data is handled by DSP, it is real
Now the quick and precisely positioning of Method of Cable Trouble Point to be measured is avoided tearing open because of mistake to reduce the mistake dismounting number in maintenance work
Dress leads to the reduction of cable life, and not by ambient noise interference, simple in structure, and accuracy of detection is high, fast response time, resists dry
It is strong to disturb ability, stability and good reliability are with good expansibility.
Embodiment described above is only that preferred embodiments of the present invention are described, not to this practicality
Novel conception and scope is defined.Without departing from the design concept of the present utility model, ordinary people in the field couple
The all variations and modifications that the technical solution of the utility model is made, should fall within the protection scope of the present utility model, this reality
With novel claimed technology contents, all record in detail in the claims.
Claims (5)
1. a kind of plane cable fault positioning device, it is characterised in that：It is narrow including data processing unit, trigger control unit, UWB
Impulse generating unit, signal condition unit, delay unit, data acquisition unit and CAN interface unit；The UWB burst pulses production
Raw unit is operated in the avalanche type switching characteristic of avalanche region using microwave transistor, in conjunction with the basic functional principle of MARX circuits,
It generates the burst pulse transmitting signal of ns grades of rising edges and is sent to cable under test；The fault point of the cable under test is to the narrow arteries and veins
Punching transmitting signal reflects, and the signal condition unit receives the echo-signal emitted and carries out limited range enlargement and range is cut
It changes, output difference signal is sent into the data acquisition unit；The trigger control unit generates the UWB burst pulses and generates unit
The trigger signal of work, while the trigger control unit generates the startup of each pulse recurrence interval of the data acquisition unit
Signal, and the pulse recurrence interval is counted；It is single to the delay that the trigger control unit exports delays time to control amount
Member, the delay unit are delayed accordingly to next pulse recurrence interval according to the delays time to control amount；It is described
Data acquisition unit to carrying out equivalent sampling through the signal condition unit treated echo received signal, be sent by collection result
The data processing unit；The data processing unit handles the data of acquisition, calculates the failure of the cable under test
Point position；The data processing unit carries out communication with host computer by the CAN interface unit and connect, and receives the host computer
Test instruction, and send result of calculation to the host computer；
It includes the first~the 4th transistor, the first~the 8th rheostat, the first~the 8th capacitance that the UWB burst pulses, which generate unit,
With first~thirteenth resistor, wherein the described first~the 4th transistor be NPN type triode；Described first~the 4th transistor
Base stage be connected with the trigger signal caused by the trigger control unit；
The signal condition unit include first~third operational amplifier, the first field-effect tube, the second field-effect tube, first~
Third switch, the 14th~the 26th resistance, the 9th and the tenth capacitance, wherein first and second operational amplifier is selected
Current feedback amplifier AD8000, the third operational amplifier select difference amplifier AD4937, first field-effect
Pipe is N ditch technotrons, and second field-effect tube is P ditch technotrons；First and second field-effect tube
Amplitude limit is carried out to the echo received signal, first operational amplifier constitutes emitter following circuit, the second operational amplifier
The range switching amplifying circuit for constituting adjustable gain is switched with the first~third, the third operational amplifier constitutes single-ended
Difference channel, output adapt to the differential signal of the data acquisition unit.
2. a kind of plane cable fault positioning device according to claim 1, it is characterised in that：The data acquisition unit
Select A/D converter AD9215-105.
3. a kind of plane cable fault positioning device according to claim 1, it is characterised in that：The delay unit is selected
Delay chip MC100EP196.
4. a kind of plane cable fault positioning device according to claim 1, it is characterised in that：The data processing unit
Select digital signal processor TMS320F2812.
5. a kind of plane cable fault positioning device according to claim 1, it is characterised in that：The CAN interface unit
Select CAN isolated transceivers CTM8251AT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721712591.0U CN207798996U (en) | 2017-12-11 | 2017-12-11 | A kind of plane cable fault positioning device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721712591.0U CN207798996U (en) | 2017-12-11 | 2017-12-11 | A kind of plane cable fault positioning device |
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| Publication Number | Publication Date |
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| CN207798996U true CN207798996U (en) | 2018-08-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116996199A (en) * | 2023-09-26 | 2023-11-03 | 为准（北京）电子科技有限公司 | UWB signal rising edge detection method, device, electronic equipment and storage medium |
-
2017
- 2017-12-11 CN CN201721712591.0U patent/CN207798996U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116996199A (en) * | 2023-09-26 | 2023-11-03 | 为准（北京）电子科技有限公司 | UWB signal rising edge detection method, device, electronic equipment and storage medium |
| CN116996199B (en) * | 2023-09-26 | 2023-12-01 | 为准（北京）电子科技有限公司 | UWB signal rising edge detection method, device, electronic equipment and storage medium |
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| GR01 | Patent grant | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20190619 Address after: 110000 Shangshengou Village, Hunnan District, Shenyang City, Liaoning Province, 858-1 (all) Patentee after: Dillier (Shenyang) Technology Co., Ltd. Address before: 313000 room 1506, 3 Hyundai Plaza, Wuxing District, Huzhou, Zhejiang. Patentee before: HUZHOU YOUCHUANG TECHNOLOGY CO., LTD. |