CN100428759C - Noncontactive blanket sensing device for monitoring high voltage into voide frequency cable - Google Patents
Noncontactive blanket sensing device for monitoring high voltage into voide frequency cable Download PDFInfo
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- CN100428759C CN100428759C CNB2004100246968A CN200410024696A CN100428759C CN 100428759 C CN100428759 C CN 100428759C CN B2004100246968 A CNB2004100246968 A CN B2004100246968A CN 200410024696 A CN200410024696 A CN 200410024696A CN 100428759 C CN100428759 C CN 100428759C
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 16
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- 239000002356 single layer Substances 0.000 claims description 6
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- 238000001514 detection method Methods 0.000 abstract description 7
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- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 19
- 238000000034 method Methods 0.000 description 5
- 238000012805 post-processing Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000013480 data collection Methods 0.000 description 3
- 230000009545 invasion Effects 0.000 description 3
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- 230000006378 damage Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000010365 information processing Effects 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
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Abstract
The present invention relates to a contactless blanket sensing device for monitoring high voltage into video frequency cables, which is used for the technical field of signal detection and processing. A contactless blanket sensor and an information preprocessor form a sensing and identifying whole. The contactless blanket sensor is a tubular structure body and is composed of two blanket semicircular tubular devices which can optionally flex and move. A signal output interface of the contactless blanket sensor is connected with an input port of the information preprocessor through a signal connecting cable. The present invention has the advantages of high sensitivity, high running speed, simple wiring, small volume and low cost. All signals in 1200 pairs of circuits can be inputted into a data processing unit in a data collecting period by one step. Moreover, the signals can be rapidly divided first through circuits of frequency selection, etc. Therefore, the present invention can largely omit the time of processing software by a central processing unit.
Description
Technical field
The present invention relates to a kind of monitoring high voltage into voide frequency cable sensing device, specifically is a kind of contactless attached leaf induction monitoring high voltage into voide frequency cable unit.Be used for input and processing technology field.
Background technology
Voice-frequency cable generally has talk line more than 1200 pairs, in the long range signals transmission course, must consider since during the damaged or artificial destruction of wire insulation matter regular meeting and the possibility that 60V and even the high-tension electricities such as alternating voltage more than the 220V are swarmed into appears being higher than.When this alternating voltage was swarmed into voice-frequency cable, in case constitute high tension loop, equipment can meet with heavy damage immediately.Yet in most cases, alternating voltage is single-ended when swarming into (when not constituting high tension loop as yet), it in time be detected, and does not also have very ripe practical technique directly to be adopted at present.Seriousness in view of this type of accident potential, the phenomenon that on the engineering this high-tension electricity and voice-frequency cable is come in contact and do not form the loop has proposed the requirement of dealing with problems to technos for a long time, and it will solve in fact exactly to the non-contact detecting that whether has 50Hz low frequency civil power high voltage electric field field intensity in the voice-frequency cable and the technology of information processing.
Find by literature search, Chinese patent application number 00100661.4, patent name is: the monitor for city power invasion of telecommunication cable, this patented technology is a kind of monitor for city power invasion of telecommunication cable, civil power intrusion monitor and hand-hold type locator two parts by telecommunication cable are formed, wherein invading monitor includes: the current detection circuit that is made of phase-locked loop chip, the control circuit that voltage detecting circuit and power circuit are formed and adopt the non-electric current that electrically contacts mode respectively and the voltage detecting probe, wherein the hand-hold type locator is made up of casing built-in detection probe and control circuit.The present invention is used for monitoring, alarm and the location that main frame telecommunication cable civil power is invaded fault, can combine with the computer and the communication technology, composition one cover monitor set, alarm, location, data base administration are the main frame far-end centralized monitoring system of one with communicating by letter.
Above-mentioned patent is based on substantially: " when having civil power to invade in the load-carrying subscribers feeder on total distribution coil holder, just produce big electric current on this subscribers feeder at once." that is to say, adopt the non-big electric current that is produced when the formula induction coil induces the civil power intrusion that electrically contacts.Although when " civil power is invaded and do not formed the loop ", this patent has adopted " the non-voltage detecting probe that electrically contacts mode ", and promptly " induction metal plate that is the concave arc shape " responds to detection to induction field.But this structure is because the mistake alarm takes place in various civil power interference signals easily.In order to solve above-mentioned critical defect, " voltage detecting circuit " employing in this patent " the intelligent decision function that multistage Schmidt trigger time-delay triggers ".This is a kind of unreliable, also is uneconomic technical scheme.
Summary of the invention
The present invention is directed to above shortcomings in the prior art, a kind of contactless attached leaf induction monitoring high voltage into voide frequency cable unit is provided, make its hidden danger that can correctly detect accident in real time, not only economy but also reliable.
The present invention is achieved by the following technical solutions, and it is whole with identification that the present invention constitutes a sensing by contactless attached leaf inductor and information preprocessor two large divisions.The former is a kind of tubular body structure, is made of two attached leaf semicircle tubular devices that can arbitrarily close the activity of closing, and is convenient to on-the-spot the installation.Contain attached leaf in attached leaf semicircle tubular device inboard, can deep enough axial location when making it in running order to cable, therefore can evenly receive be distributed in Different Diameter to information measured.Two attached leaf semicircle tubular devices rely on the button spring to realize opening/closing two states.Paste the double layer of metal sensor film in each attached leaf semicircle tubular device along the face of cylinder, simultaneously the metal sensor film inwardly side by side the position paste the single-layer metal film, this single-layer metal film is as anti-negative electrostatic screen generator under the effect that adds positive voltage.The metal sensor film is connected to form signal output interface with anti-negative electrostatic screen generator by lead-in wire and signal pins, and the signal output interface of contactless attached leaf inductor is connected by the input port of signal stube cable with the information preprocessor.All signals on the voice-frequency cable export the information preprocessor to by above-mentioned contactless attached leaf inductor exactly.Because attached leaf can go deep into all position levels of voice-frequency cable to overcome the 1200 mutual shielding actions to (2400) cable, therefore can pick up civil power any in the cable swarms into information, and the enough strong and weak big or small induced signal of acquisition is also eliminated and swarmed into space of points location sensitive difference.
The information preprocessor is made up of frequency selection circuit, multistage amplifier circuit and comparison circuit.Its annexation is: the signal output interface of contactless attached leaf inductor is connected to the lifting that at first gains of first order amplifying circuit.Signal input frequency selection circuit after first order amplifying circuit amplifies.Frequency selection circuit comprises narrow frequency range band resistance and the logical two groups of circuit of narrow frequency range band.The signal output part of frequency selection circuit is connected to the signal input part of second level amplifying circuit.The signal output part of second level amplifying circuit is connected with comparison circuit by the impedance follow circuit.The signal of being exported by the signal output interface of contactless attached leaf inductor is the mixed signal that comprises multiple information, and the signal after the first order is amplified is sent into frequency selection circuit and carried out frequency screening.Narrow frequency range band resistance and the logical two groups of circuit of narrow frequency range band that the centre frequency of frequency selection circuit is respectively 25Hz and 50Hz compose in series, and therefore can obtain the 50Hz signal output of high s/n ratio when getting rid of shake bell signal.The high s/n ratio 50Hz signal that obtains by frequency selection circuit input to behind the amplifying circuit of the second level can to next stage output enough the signal voltage of gain export.In order to improve the ability of amplifying circuit traction load, with its signal with increase one-level impedance follow circuit before a plurality of comparators are connected, the signal after promptly will amplifying by the impedance follow circuit is connected with last grade a plurality of comparison circuits.The setting of comparison circuit number determined by information preprocessor output indication form, and promptly the comparison circuit number is with to swarm into the voltage classification corresponding.Comparison circuit is exported with high/low level, can provide signal for post-processing technology very easily.
Implementation procedure of the present invention: the voice-frequency cable section of peeling off outer shielding layer at the stored-program control exchange near-end is installed attached leaf inductor.Swarm into transmission medium in the communication engineering when high pressure such as civil powers, do not constitute the loop even swarm into voltage, the electromotive force information that adopts contactless attached leaf inductor all can be present in the cable all picks up out.Send into frequency selection circuit after the information that attached leaf inductor picks up is amplified by the first order at once and stop the non-city signal of telecommunication (comprising bell signal) to pass through, and allow city's signal of telecommunication of 50Hz pass through with the decay of minimum.Therefore can when getting rid of shake bell signal, obtain the 50Hz signal output of high s/n ratio.Signal by frequency selection circuit output enters the gain of second level amplifying circuit with the picked information of further raising.Be connected to improve the ability of amplifying circuit traction load with the comparison circuit of last level by the impedance follow circuit by the signal after the amplification of the second level.Whether comparison circuit is subjected to swarming into of civil power with indication current time voice-frequency cable promptly exporting high/low two states level with the reference voltage of setting after relatively.The setting of comparison circuit number is with to swarm into the voltage hierarchical level corresponding.The present invention can be differently shown the line voltage zoning section of swarming into according to use occasion or user's specific (special) requirements and export corresponding characteristic signal and use for post-processing technology.
The present invention picks up in real time the non-audio signals that has large capacity audio more than 1200 pairs and exist in the cable frequently and separates, can make existing civil power high pressure information in its voice-frequency cable of online in real time detection with sensitivity, and realize separating of various non-audio signals by information processing algorithm and technology, provide coherent signal output according to the requirement of engineering.
The tangible beneficial effect of the present invention: when civil power was swarmed into voice-frequency cable and do not constituted the loop, routine techniques was by by the touring mode that detects in road each road input being come out to analyze.In the face of 1200 pairs of circuits just need 1200 data acquisition channels, this is a sizable numeral from the hardware cost input.Suppose the capture card of selecting 32 passages for use, just need to use 38 cards.If every card calculates according to current Shi Changjia $5000 unit, capture card He Ji $160000 unit just only.If adopt the passage expansion technique,, sacrifice sizable data acquisition rate although hardware cost is descended.Suppose that a channel data collection period (containing preliminary treatment) is 30ms, then whenever the touring cycle will reach 3600ms (being 36s).If adopt the passage expansion technique, then the time of Shi Yonging also will increase.This can not allow in automatic technology at all.And, also to increase signal routing more than 1200 extraly at machine room.
The non-contact detection technology is not only that the most substantial advantage is all signals in 1200 pairs of circuits can be inputed to data processing unit once in data collection cycle because it can save a large amount of wirings.And can promptly signal be carried out just dividing, so the time that can save the CPU software processes significantly by circuit such as frequency-selectings.
Although the monitor for city power invasion of the telecommunication cable in the background technology has adopted the non-contact detection technology, but because this device only can just have higher sensitivity to invading civil power when the loop current situation occurring, add that " voltage detecting circuit " employing " multistage Schmidt trigger time-delay trigger " avoids taking place the defective of technology such as mistake alarm in order to overcome various civil power interference signals, limited the use value and the scope of this technology.
That is to say that advantage of the present invention is that similar up to now technology is incomparable, summary is got up:
1, sensitivity is high.As long as it can be detected when in voice-frequency cable, having the civil power electromotive force.
2, because thoroughly having overcome civil power, the effect of attached leaf swarms into the great phenomenon of transducing signal difference that extreme distribution (invaded tone frequency channel wire and be in the two kinds of extreme situations in the nearly outer and nearly center of cable respectively) is a little caused.
3, the anti-negative electrostatic screen generator in the contactless attached leaf inductor has the mutual shielding action that overcomes because of cable and produces the power that earth shield and negative electrostatic screen influence signals collecting.
4, the speed of service is exceedingly fast.Data collection cycle＜1ms, and be to gather in week at one the information of required detection to be detected like clockwork.
5, the information that detects through the present invention can not produce false alarm signal and line voltage value level of hierarchy mistake.
6, wiring is very simple.Except the holding wire that reprocessing output is provided, need not any wiring.Sensing is contactless, needn't change any wiring of switch.
7, volume can be accomplished very for a short time, and the Outside Dimensions of the tubular cylinder under the contactless attached leaf inductor operating state only is high 90mm * diameter 80mm, and the volume of signal processing circuit only is long 80mm * 50mm * 30mm.
8, the cost cost is very low, and whole contrive equipment material cost can be below the Kong Zhizai $100 unit.
Practical application by certain telecommunication department provides strong technical guarantee to the safe operation of stored-program control exchange, and repeatedly detects the hidden danger of accident correctly.The present invention has very high added value.The present invention is connected with post-processing technology can constitutes the profuse new and high technology finished product of performance.
Description of drawings
Fig. 1 structural representation of the present invention
The contactless attached leaf induction monitoring high voltage into voide frequency cable unit that Fig. 1-a is in running order
The contactless attached leaf inductor of Fig. 1-b closes the state of closing
The contactless attached leaf inductor open configuration of Fig. 1-c
Fig. 2 information preprocessor of the present invention structured flowchart
Embodiment
As shown in Figure 1, the present invention constitutes a sensing and identification integral body by contactless attached leaf inductor 1 and information preprocessor 2 two large divisions.Contactless attached leaf inductor 1 is a kind of tubular body structure, is made of two attached leaf semicircle tubular devices that can arbitrarily close the activity of closing.The signal output interface 3 of contactless attached leaf inductor 1 is connected by the input port of signal stube cable with information preprocessor 2.All signals on the voice-frequency cable export information preprocessor 2 to by contactless attached leaf inductor 1.Because attached leaf 7 can go deep into all position levels of voice-frequency cable to overcome the 1200 mutual shielding actions to (2400) cable, therefore can pick up civil power any in the cable swarms into information, and the enough strong and weak big or small induced signal of acquisition is also eliminated and swarmed into space of points location sensitive difference.Because anti-negative electrostatic screen generator 4 is set in contactless attached leaf inductor 1, so the present invention has the mutual shielding action that overcomes because of cable and produces the power that earth shield and negative electrostatic screen influence signals collecting.
Shown in Fig. 1-a, contactless attached leaf inductor 1 is installed on the stored-program control exchange near-end peels off on the voice-frequency cable section of outer shielding layer.By the signal-transmitting cable line signal output interface 3 on the attached leaf inductor 1 is connected with information preprocessor 2.The output of information preprocessor 2 is high/low level signal, can offer multiple preprocessor and do further computing and recognition technology use.
Shown in Fig. 1-b, can deep enough axial location when the inboard of contactless attached leaf inductor 1 is contained attached leaf 7 and made it in running order to cable, therefore can evenly receive be distributed in Different Diameter to information measured.Two attached leaf semicircle tubular devices rely on button spring 6 to realize opening/closing two states.The interior double layer of metal sensor film 5 of pasting along the face of cylinder of each attached leaf semicircle tubular device, simultaneously metal sensor film 5 inwardly side by side the position paste the single-layer metal film, this single-layer metal film is as anti-negative electrostatic screen generator 4 under the effect that adds positive voltage, and metal sensor film 5 is connected to form contactless attached leaf inductor 1 signal output interface 3 with anti-negative electrostatic screen generator 4 by lead-in wire and signal pins.Very easily contactless attached leaf inductor 1 is installed on the voice-frequency cable by button spring 6.When civil power is swarmed into voice-frequency cable, even do not constitute the loop, contactless attached leaf inductor 1 can all pick up out in the anti-electromotive force information that all is present in the cable in real time under the help of electrostatic screen generator 4 of bearing by metal sensor film 5 and attached leaf 7 thereof wherein.The information of picking up is imported first order amplifying circuit 8 at once to improve signal gain.
Shown in Fig. 1-c, the opening when contactless attached leaf inductor 1 is in inoperative.
As shown in Figure 2, information preprocessor 2 is made up of first order amplifying circuit 8, frequency selection circuit 9, second level amplifying circuit 10 and comparison circuit 12.Its annexation is: the signal output interface of contactless attached leaf inductor 1 is connected to first order amplifying circuit 8 lifting that at first gains.The signal input part of the signal input frequency selection circuit 9 after first order amplifying circuit 8 amplifies.Frequency selection circuit 9 comprises narrow frequency range band resistance and the logical two groups of circuit of narrow frequency range band.The signal output part of frequency selection circuit 9 is connected to the signal input part of second level amplifying circuit 10.The signal output part of second level amplifying circuit 10 is connected with comparison circuit 12 by impedance follow circuit 11.The signal of being exported by the signal output interface 3 of contactless attached leaf inductor 1 is the mixed signal that comprises multiple information, because frequency selection circuit 9 is composed in series by narrow frequency range band resistance and logical two groups of circuit of narrow frequency range band that centre frequency is respectively 25Hz and 50Hz, therefore can when getting rid of shake bell signal, obtain the 50Hz signal output of high s/n ratio.The high s/n ratio 50Hz signal that obtains by frequency selection circuit 9 input to behind the second level amplifying circuit 10 can to next stage output enough the signal voltage of gain export.In order to improve the ability of second level amplifying circuit 10 traction loads, increase one-level impedance follow circuit 11 and be connected with a plurality of comparison circuits 12 of last level again.The setting of comparison circuit number determined by information preprocessor 2 output indication forms, and promptly the comparison circuit number can increase also and can reduce with to swarm into the voltage classification corresponding.Comparison circuit 12 is exported with high/low level, can provide signal for post-processing technology very easily.
The morphosis of attached leaf 7 also comprises other curve form such as Archimedes spiral except form shown in Fig. 1.
Below provide apparatus of the present invention the concrete embodiment that uses:
At first the skin shielding of stored-program control exchange front end voice-frequency cable is removed, then contactless attached leaf inductor of the present invention is installed on the voice-frequency cable.By the signal input/output interface contactless attached leaf inductor is connected with the information preprocessor.Remote control is closed in the teletransmission that can realize data that is connected with preprocessor of output interface by the information preprocessor.
After finishing above-mentioned connection, the present invention is promptly in running order, can online in real time civil power in the ground monitoring voice-frequency cable swarm into situation, play the protective effect of communication line, provide strong technical guarantee to the safe operation of stored-program control exchange.Swarm in case civil power occurs, the present invention promptly can detect the hidden danger of accident in real time correctly.
When the voltage of swarming into civil power more than 60V during the various situation that may occur, export prompting if divide three kinds of above civil powers of 60～120VAC, 120～220VAC and 220VAC to swarm into mode, then the present invention can be provided with the output display mode of three kinds of correspondences by three comparators.Make that high level is that 1 expression has that civil power is swarmed into, low level is the zero clearing of swarming into or be reset of the no civil power of 0 expression, then input and output correspondence relation can be referring to table 1.
The corresponding difference of table 1 is swarmed into the way of output setting and the relation of line voltage
| Swarm into voltage/ | Comparator | 1 | Comparator | 2 | Comparator | 3 outputs | Binary code |
| ＜60 | Low level | Low level | Low level | 000 | |||
| [60，120) | High level | Low level | Low level | 001 | |||
| [120，220) | High level | High level | Low level | 011 | |||
| ＞220 | High level | High level | High level | 111 |
Use the present invention when guaranteeing that online in real time is contactless and detecting civil power to swarm into information, can get rid of the erroneous judgement of the normal non-city signal of telecommunication such as ring reliably.
Claims (6)
1, a kind of contactless attached leaf induction monitoring high voltage into voide frequency cable unit, it is characterized in that, constitute a sensing and identification integral body by contactless attached leaf inductor (1) with information preprocessor (2) two large divisions, contactless attached leaf inductor (1) is a kind of tubular body structure, be made of two attached leaf semicircle tubular devices that can arbitrarily close the activity of closing, the signal output interface (3) of contactless attached leaf inductor (1) is connected by the input port of signal stube cable with information preprocessor (2);
Attached leaf (7) is contained in the inboard of described contactless attached leaf inductor (1), two attached leaf semicircle tubular devices are realized opening/closing by the button spring (6) that is provided with on it, the interior double layer of metal sensor film (5) of pasting along the face of cylinder of each attached leaf semicircle tubular device, simultaneously metal sensor film (5) inwardly side by side the position paste the single-layer metal film, this single-layer metal film is as anti-negative electrostatic screen generator (4) under the effect that adds positive voltage, and metal sensor film (5) is connected to form contactless attached leaf inductor (1) signal output interface (3) with anti-negative electrostatic screen generator (4) by lead-in wire and signal pins.
2, contactless attached leaf induction monitoring high voltage into voide frequency cable unit according to claim 1 is characterized in that, described contactless attached leaf inductor (1) is installed on the voice-frequency cable by button spring (6).
3, contactless attached leaf induction monitoring high voltage into voide frequency cable unit according to claim 1, it is characterized in that, described information preprocessor (2) is by first order amplifying circuit (8), frequency selection circuit (9), second level amplifying circuit (10) and comparison circuit (12) are formed, its annexation is: the signal output interface of contactless attached leaf inductor (1) is connected to first order amplifying circuit (8), the signal input part of the signal input frequency selection circuit (9) after first order amplifying circuit (8) amplifies, the signal output part of frequency selection circuit (9) is connected to the signal input part of second level amplifying circuit (10), the signal output part of second level amplifying circuit (10) is connected with comparison circuit (12), and comparison circuit (12) is exported with high/low level.
4, contactless attached leaf induction monitoring high voltage into voide frequency cable unit according to claim 3, it is characterized in that, described information preprocessor (2) increases one-level impedance follow circuit (11) at the signal output part of second level amplifying circuit (10), the signal output part of second level amplifying circuit (10) is connected by the comparison circuit (12) of impedance follow circuit (11) with last level, improves the ability of second level amplifying circuit (10) traction load.
According to claim 3 or 4 described contactless attached leaf induction monitoring high voltage into voide frequency cable units, it is characterized in that 5, the quantity of described comparison circuit (12) is determined by information preprocessor (2) output indication form.
6, contactless attached leaf induction monitoring high voltage into voide frequency cable unit according to claim 5 is characterized in that, described frequency selection circuit (9) is made up of narrow frequency range band resistance and the logical two groups of circuit of narrow frequency range band that centre frequency is respectively 25Hz and 50Hz.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100246968A CN100428759C (en) | 2004-05-27 | 2004-05-27 | Noncontactive blanket sensing device for monitoring high voltage into voide frequency cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100246968A CN100428759C (en) | 2004-05-27 | 2004-05-27 | Noncontactive blanket sensing device for monitoring high voltage into voide frequency cable |
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| CN1585437A CN1585437A (en) | 2005-02-23 |
| CN100428759C true CN100428759C (en) | 2008-10-22 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1260661A (en) * | 2000-01-26 | 2000-07-19 | 福建省邮电科学研究所 | Monitor for city power invasion of communication cable |
| CN2465420Y (en) * | 2001-02-22 | 2001-12-12 | 李永慎 | Monitoring apparatus for telephone line |
| CN1344936A (en) * | 2001-08-02 | 2002-04-17 | 南京普天通信股份有限公司 | Measuring system and method for industrial frequency current in opened magnetic path |
-
2004
- 2004-05-27 CN CNB2004100246968A patent/CN100428759C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1260661A (en) * | 2000-01-26 | 2000-07-19 | 福建省邮电科学研究所 | Monitor for city power invasion of communication cable |
| CN2465420Y (en) * | 2001-02-22 | 2001-12-12 | 李永慎 | Monitoring apparatus for telephone line |
| CN1344936A (en) * | 2001-08-02 | 2002-04-17 | 南京普天通信股份有限公司 | Measuring system and method for industrial frequency current in opened magnetic path |
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| CN1585437A (en) | 2005-02-23 |
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Assignee: Shanghai LEAR STEC Automotive Parts Co., Ltd. Assignor: Shanghai Jiao Tong University Contract record no.: 2010310000106 Denomination of invention: Noncontactive blanket sensing device for monitoring high voltage into voide frequency cable Granted publication date: 20081022 License type: Exclusive License Open date: 20050223 Record date: 20100716 |
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Effective date of registration: 20161221 Address after: 223001 science and Technology Industrial Park, Jiangsu, Huaian science and technology road, No. 18 Patentee after: North Jiangsu Institute of Shanghai Jiao Tong University Address before: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee before: Shanghai Jiaotong Univ. |
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Effective date of registration: 20170309 Address after: 223001 science and Technology Industrial Park, Jiangsu, Huaian science and technology road, No. 18 Patentee after: North Jiangsu Institute of Shanghai Jiao Tong University Address before: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee before: Shanghai Jiao Tong University |
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