CN1046830C - Fiber optic cable monhoring system - Google Patents
Fiber optic cable monhoring system Download PDFInfo
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- CN1046830C CN1046830C CN93104451A CN93104451A CN1046830C CN 1046830 C CN1046830 C CN 1046830C CN 93104451 A CN93104451 A CN 93104451A CN 93104451 A CN93104451 A CN 93104451A CN 1046830 C CN1046830 C CN 1046830C
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- moisture content
- cable
- optical fiber
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- signal generator
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Abstract
The present invention relates to a method and a system for monitoring the states of an optical fiber communication cable. Two laser sources are utilized for simultaneously monitoring the attenuation of two light signals with different wavelengths so as to confirm and analyze the mechanical states of a cable structure. A specific detector code is designated for each joint. A sensor which is a water-excited battery sensor drives an optical joint detector through moisture detection, water which enters a monitored joint piece wets a winding tape, excites the sensor to generate sufficient electric energy to drive a timer, a code generator and a modulation circuit in a detector unit. The modulated light signals are monitored at a device terminal, and the position of a decoded alarm detector is addressed.
Description
The present invention relates to the monitoring of telecommunication cable, relate more specifically to the monitoring of optical fiber communication cable.
Phone and some other telecommunication cables will stand environment and the people is damage and the abrasion that cause.Can damage the cable of exposure such as bad weather environment such as strong wind, ice and snow, rainwater mighty torrent and thunders and lightnings.Building or destruction near harm may come from.It is a main cause that causes service disruption (broken string) that rainwater or underground water immerse in impaired part cable core or the adapter piece.Therefore, people have made the state that various effort keep cable to be in being in good repair, and anti-sealing enters among the construction of cable.
Frequently, damage does not cause the forfeiture of service immediately, but causes cable system slowly to degenerate, and this slowly degenerating usually causes cable failure and service disruption.Then must under very urgent situation, carry out its reparation later.This very high rehabilitation expense of will paying wages on the one hand also causes the loss on the income on the one hand.
Begin till now from first leader cable equipment, using some to safeguard that monitoring system is to provide the early warning of cable fault.Time that this makes people to be ranked to safeguard and avoid losing service and expensive reparation.The earliest system uses air pressure to prevent water breakthrough cable or adapter piece, and comes detection failure by the air velocity that measurement enters the cross-section of cable.
Modern telephone cable comprises fibre-optic cable, is usually filled by the water proof mixture, flows among the cable core to prevent water.Though provide good resistance for the water enchroachment (invasion) evil, the composition of filling also stops or has seriously limited flowing of air, thereby makes the air pressure monitoring system become useless.In order to overcome this restriction, and safeguard monitoring, developed some all-electronic systems, as 5,077, No. 526 described those systems of United States Patent (USP) of people such as people's such as McNaughton No. 4,480,251, United States Patent (USP) and Vokey for the telephone cable that is filled provides.
Be the fibre-optic cable that is configured under some applicable cases, comprise that fibre-optic cable all adopts dielectric insulation material as the situation in overhead electric power transfer fixing cord or the low phase electric conductor (below phase conduc-tors) of the suspension type on launching tower.Therefore, those are just no longer suitable such as the described traditional cable of metallic conductance body component and the joint monitoring method of needing of people's patents such as people such as McNaughton and Vokey.
The OTDR technology has been used to monitor optical cable and joint, and this technology is injected optical fiber with light pulse, measures the energy of reflection again, to measure increasing of energy loss.These method costs are very high, and need be in adapter piece the specified moisture of detection fiber bending apparatus, to attempt to monitor the immersion of water, in addition, the characteristic of joint bending apparatus always can not expect, and must accurately know the definite optical distance to each joint.Although preferably can adopt active checkout gear at the tap points place, the main difficulty that exists is for all dielectric cable, does not have practical means to provide power supply to operate these devices to the joint.
According to an aspect of the present invention, provide a kind of moisture content sensing signal generator here, it comprises:
An automatically controlled coded signal generating means is in order to produce fault-signal according to the electric energy that receives; Optic modulating device is coupled with described coded signal generation device, responds the generation of fault-signal, and produces the optical signalling of a coding; And transducer electrolysis device, being electrically connected with described coded signal generating means connects, and described sensor device is inoperative when drying, and when touching water, it works, and produces electric energy and electric energy is offered described coded signal generating means.
Described moisture content sensing signal generator is used to send the signal that moisture content penetrates the adapter piece that contains piecing devices, and described piecing devices keep the aligning of the end optic fibre end of two Connectorized fiber optic cablings;
Described optical modulator comprises gearshift, in order to the corresponding optic fibre end displacement of one of optic fibre end of making a cable selectively with respect to another root cable;
Described coded signal generating means and described gearshift are coupled, in order to start described gearshift selectively.
Described moisture content detecting sensor device comprises two kinds of metal partss and the water-soluble ionize solid between metal parts.
Each described metal parts comprises the ribbon of an elongation, is contained in the electrical insulating material of porous.
Described metal parts and ionize solid comprise a moisture content surveying tape.
The material of one of described metal parts is a magnesium, and the material of another metal parts is a copper, and described ionization solid is a copper sulphate.
Described coded signal generating means comprises the device that is used to produce the signal of telecommunication.
Described coded signal generating means comprises the device that is used to produce the pulsed signal of telecommunication.
According to another aspect of the present invention, provide the sensor unit of a kind of optics butt joint here, what be used to send two Connectorized fiber optic cablings that moisture content penetrates disturbs the signal of encapsulation connector to joint, and described sensor unit comprises:
Docking facilities is positioned at described butt joint and closes up the place, is used to keep the end alignment of the optical fiber separately of described cable;
Gearshift is selectively with the corresponding optical fiber end displacement of one of optical fiber end of a cable with respect to another cable;
Signal generation apparatus is coupled to described mobile device, is used for starting selectively described mobile device; And
The moisture content checkout gear, responding described site closure has moisture content to exist, and starts described signal generation apparatus, and described moisture content checkout gear comprises: a moisture content detecting sensor device, respond described sensor device and touch water, produce a voltage.
Described moisture content checkout gear comprises: the ribbon of an elongation is wrapped in around the described docking facilities.
Described moisture content checkout gear comprises: two isolated metal partss, be used for prolonging basically the length of described ribbon, and the ionization solid is between described two metal partss.
Described signal generation apparatus comprises: the device that is used to produce the signal of telecommunication of coding.
Described gearshift comprises: a magnetic part is coupled to a described optical fiber end; An electromagnet, adjacent with described magnetic part, be coupled with described signal generation device electricity.
Below in conjunction with accompanying drawing these aspects of the present invention will be described in further detail.
Show embodiments of the invention with the form of giving an example in the accompanying drawing.Wherein:
Fig. 1 is the schematic diagram according to monitoring system of the present invention;
Fig. 2 is the schematic diagram of fiber optic emitter;
Fig. 3 is the schematic diagram of photodetector unit;
Fig. 4 is the profile of a joint;
Fig. 5 is the profile of moisture acquisition sensor device;
Fig. 6 is the curve chart of expression optical fiber splice coupling loss with respect to the optic fibre end skew;
Fig. 7 is the schematic diagram of optical receiver;
Fig. 8 is the schematic diagram of an alternative embodiment of photodetector unit;
Fig. 9 is the curve chart of expression optical fiber splice coupling loss with respect to the optic fibre end axial separation.
Referring to accompanying drawing, particularly Fig. 1 shows a fiber optic cable monhoring system 10 that is associated with fibre-optic cable 12.Shown optical cable is a single mode (sm) optical cable, and its length is up to 100Km.Shown optical cable comprises one along 14 parts of the joint on its length direction.Usually, a complete cable can comprise a lot of joints.This optical cable comprises a lot of root optical fiber 16.
Receiving terminal at optical fiber is an optical receiver 20 (Fig. 7), and it detects the laser that intercepts on the diode 42 and detect from each monitored optical fiber at a PIN, and described light converts the signal of telecommunication to by diode, and this signal of telecommunication is amplified by preamplifier 44.This signal of telecommunication comprises frequency content F1 and F2, and they are by band pass filter 46 and 50 separated coming, and measured circuit 48 and 52 is measured.Calculate the optical attenuation of fiber lengths on two wavelength by the amplitude of measuring.
Optical receiver also comprises a pulse detector 54, in order to monitor the pulse that produces in the photodetector unit.This photodetector unit will be described in more detail in the back.
The output of optical receiver is sent to multiplexer 56, and the latter is scanned the output from each monitored optical fiber, and provides input to central office's terminal 58; Central office's terminal 58 comprises warning circuit 58, gives the alarm when exceeding a predetermined maximum attenuation at detected optical fiber attenuation.This terminal also comprises a decoding circuit 60, in order to deciphering from the pulse of pulse detector 54.
Referring to Fig. 3,4 and 5, joint 14 comprises a modulator 62 especially, is used for producing pulse at the light by each optical fiber emission and detects for pulse detector 54.Modulator comprises a joint 64 that has V-type groove 66, and V-type groove 66 makes by the termination of the monitored optical fiber of cable joint and aimed at.In the joint, optic fibre end 70 has a very little ferrous metal element 72 that is connected in its end face.It is positioned under the utmost point of being close to modulator electromagnet 74.This ferromagnet 74 electrically is connected between the collector electrode 78 of moisture content acquisition sensor 76 and driving transistors 80.The emitter of this transistor 80 is connected in moisture content acquisition sensor 76 its base stages 84 and then is connected in code generator 86, and the latter is connected to clock 88 again.Code generator all strides across the terminal of moisture acquisition sensor 76 with clock and is connected.
With 5 to 10 microns energy needed of 125 microns glass fibre deflection is considerably less.These detector circuits are designed to adopt low-voltage microwatt CMOS integrated circuit.As a result, one meter long single-sensor battery can be to modulator and relevant several weeks of some circuit supplies.Thereby guaranteed detection to wet joint.
As previously mentioned, optical receiver intercepts and detects the laser from monitored optical fiber, and converts thereof into a signal of telecommunication.Decoded in decoding circuit by the pulse that pulse detector 54 detects, to distinguish the adapter piece that pulse occurs.Be a little purposes, will produce an exclusive pulse signal for the code generator 86 of each adapter piece.
Optical attenuation on the whole optical fiber under two kinds of monitor signal wavelength is to calculate by the amplitude of each switching electrical signals of measuring.Any over proof additional optical fiber decay all obtains analyzing.
Increase if record similar decay under two kinds of wavelength, so this decay increases can be thought to be caused by microbend, and it may be because cable extruding or cause with the construction of cable change of temperature correlation.Increase if only detect tangible decay under 1550nm, problem then may be relevant with macrobending, this normally owing to cable tangle or losing of optical fiber causes.
An alternative embodiment of photodetector is shown in Fig. 8.This embodiment is different from part embodiment illustrated in fig. 3 and is that modulator has adopted the joint 100 of capillary type, and in this joint, optic fibre end is aimed in sleeve pipe 102.Optical fiber one end 104 is fixing, and the other end is movable but apply bias voltage by spring to stiff end.An iron class sleeve pipe 108 is fixed on the movable end of optical fiber.Modulator coil 110 is around the optical fiber of adjacency sleeve pipe 108.When being excited, coil detaches optic fibre end 104 with optic fibre end 106, so just the signal on the optical fiber is modulated.
The curve that coupling loss is separated with respect to the axial optical fiber termination is provided by Fig. 9.Fibre movement is carried out with a kind of like this amplitude level, promptly greater than producing same coupling loss, needed skew.
Modulator and relevant electricity and mechanical organ may be not easy to be installed among the joint carriage or other adapter assembly that is used in the adapter piece, can utilize the appropriate location of the carriage back side or side so.
Although more than described one embodiment of the present of invention, it will be appreciated that, can also make some other embodiment within the scope of the invention.Therefore, for example, the photodetector unit can adopt some non-modulators as the electromagnetic type shown in the figure.For example, can electric pulse be changed into mechanical bias and follow-up coupling attenuation with piezoelectric crystal or some other dynamo-electric modulating device.Any other device that plays the optical switch effect all can adopt.The moisture content acquisition sensor can be made by any two kinds of metals of selecting, as long as provide half suitable cell reaction under the situation that suitable electrolyte exists.Therefore be to be understood that, can not think that the present invention is only limited to disclosed specific embodiment.The present invention is only limited by appending claims.
Claims (13)
1. a moisture content sensing signal generator is characterized in that, comprising:
An automatically controlled coded signal generating means is in order to produce fault-signal according to the electric energy that receives;
Optic modulating device is coupled with described coded signal generation device, responds the generation of fault-signal, and produces the optical signalling of a coding; And
The electrolytic sensors device, being electrically connected with described coded signal generating means connects, and described sensor device is inoperative when drying, and when touching water, it just works, and produces electric energy and electric energy is offered described coded signal generating means.
2. according to the moisture content sensing signal generator of claim 1, it is characterized in that:
Described moisture content sensing signal generator is used to send the signal that moisture content penetrates the adapter piece that contains piecing devices, and described piecing devices keep the aligning of the end optic fibre end of two Connectorized fiber optic cablings;
Described optical modulator comprises gearshift, in order to the corresponding optic fibre end displacement of one of optic fibre end of making a cable selectively with respect to another root cable;
Described coded signal generating means and described gearshift are coupled, in order to start described gearshift selectively.
3. according to the moisture content sensing signal generator of claim 1 or 2, it is characterized in that described moisture content detecting sensor device comprises two kinds of metal partss and the water-soluble ionize solid between metal parts.
4. according to the moisture content sensing signal generator of claim 3, it is characterized in that each described metal parts comprises the ribbon of an elongation, be contained in the electrical insulating material of porous.
5. according to the moisture content sensing signal generator of claim 4, it is characterized in that described metal parts and ionize solid comprise a moisture content surveying tape.
6. according to the moisture content sensing signal generator of claim 5, it is characterized in that the material of one of described metal parts is a magnesium, the material of another metal parts is a copper, and described ionization solid is a copper sulphate.
7. according to the moisture content sensing signal generator of claim 1, it is characterized in that described coded signal generating means comprises the device that is used to produce the signal of telecommunication.
8. according to the moisture content sensing signal generator of claim 7, it is characterized in that described coded signal generating means comprises the device that is used to produce the pulsed signal of telecommunication.
9. the sensor unit of optics butt joint, what be used to send two Connectorized fiber optic cablings that moisture content penetrates disturbs the signal of encapsulation connector to joint, it is characterized in that described sensor unit comprises:
Docking facilities is positioned at described butt joint and closes up the place, is used to keep the end alignment of the corresponding optical fiber separately of described cable;
Gearshift is selectively with the corresponding optical fiber end displacement of one of optical fiber end of a cable with respect to another cable;
Signal generation apparatus is coupled to described mobile device, is used for starting selectively described mobile device; And
The moisture content checkout gear, responding described site closure has moisture content to exist, and starts described signal generation apparatus, and described moisture content checkout gear comprises: a moisture content detecting sensor device, respond described sensor device and touch water, produce a voltage.
10. the sensor unit that connects according to the optics of claim 9, it is characterized in that described moisture content checkout gear comprises: the ribbon of an elongation is wrapped in around the described docking facilities.
11. connect sensor unit according to the optics of claim 10, it is characterized in that described moisture content checkout gear comprises: two isolated metal partss are used for prolonging basically the length of described ribbon; The ionization solid is between described two metal partss.
12. connect sensor unit according to the optics of claim 9, it is characterized in that described signal generation apparatus comprises: the device that is used to produce the signal of telecommunication of coding.
13. the optics according to claim 12 connects sensor unit, it is characterized in that described gearshift comprises: a magnetic part is coupled to a described optical fiber end; An electromagnet, adjacent with described magnetic part, be coupled with described signal generation device electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93104451A CN1046830C (en) | 1993-04-14 | 1993-04-14 | Fiber optic cable monhoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93104451A CN1046830C (en) | 1993-04-14 | 1993-04-14 | Fiber optic cable monhoring system |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99105287A Division CN1236234A (en) | 1999-04-30 | 1999-04-30 | Fiber optic cable monitoring system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1093846A CN1093846A (en) | 1994-10-19 |
| CN1046830C true CN1046830C (en) | 1999-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93104451A Expired - Fee Related CN1046830C (en) | 1993-04-14 | 1993-04-14 | Fiber optic cable monhoring system |
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| Country | Link |
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| CN (1) | CN1046830C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7280769B2 (en) * | 2003-07-28 | 2007-10-09 | Emerson Electric Co. | Method and apparatus for operating an optical receiver for low intensity optical communication in a high speed mode |
| JP4009623B2 (en) * | 2004-08-16 | 2007-11-21 | 埼玉日本電気株式会社 | Wet detection seal, mobile phone and electronic device using the same |
| DE102006061164B4 (en) | 2006-12-22 | 2018-12-27 | Osram Opto Semiconductors Gmbh | Light-emitting device |
| CN111398201B (en) * | 2020-06-08 | 2020-09-22 | 翼捷安全设备（昆山）有限公司 | Optical gas detector |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5150243A (en) * | 1989-06-12 | 1992-09-22 | Fujitsu Limited | Method and apparatus for monitoring an optical network interface |
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1993
- 1993-04-14 CN CN93104451A patent/CN1046830C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5150243A (en) * | 1989-06-12 | 1992-09-22 | Fujitsu Limited | Method and apparatus for monitoring an optical network interface |
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| Publication number | Publication date |
|---|---|
| CN1093846A (en) | 1994-10-19 |
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