CN100397034C - Monitor device for anchorage cable long term working state and its method - Google Patents
Monitor device for anchorage cable long term working state and its method Download PDFInfo
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- CN100397034C CN100397034C CNB2004100305805A CN200410030580A CN100397034C CN 100397034 C CN100397034 C CN 100397034C CN B2004100305805 A CNB2004100305805 A CN B2004100305805A CN 200410030580 A CN200410030580 A CN 200410030580A CN 100397034 C CN100397034 C CN 100397034C
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Abstract
The present invention relates to a device for monitoring long-term working states of an anchor cable and a method thereof. The device is composed of a distributed optical fiber sensing system, a transmission optical fiber, an optical switch and an optical time domain reflectometer which are arranged in the monitored anchor cable, wherein the distributed optical fiber sensing system is connected with the transmission optical fiber, the transmission optical fiber is connected with the optical time domain reflectometer through the optical switch, and the distributed optical fiber sensing system can be a built-in or an external optical fiber and cable sensing system. The monitoring method comprises the steps that: the device is provided with an optical fiber sensing system and is connected with a device for monitoring long-term working states of an optical fiber anchor cable, a narrow pulse optical wave is modulated and conveyed, the feedback information of the sensing system is collected, the return information of the sensing system is analyzed and proceed, etc. The device and the method can carry out long-term and stable tracking detection on the anchor cable, and accurately and generally reflect the stress distribution situation of the whole anchor cable. The optical fibers and cables serving as the optical fiber sensing system are embedded between a central wire and a side wire of a steel strand or among the steel wire gaps of steel cables, are free from the shear force function, are difficult to damage or destroy, and are free from the limitation of construction environments.
Description
Technical field
The present invention relates to a kind of presstressed reinforcing steel long-term work state monitoring apparatus and method thereof, particularly a kind of anchor cable long-term work state monitoring apparatus and method thereof with Fibre Optical Sensor.
Background technology
Prestress anchorage cable is widely used in the engineerings such as water conservancy, water power, building, traffic, underground rock cavern reinforcing, slope project reinforcing in recent years.Since anchoring engineering be a complexity concealed work, in use, prestress will be followed the variation of factors such as the loose and underground water of temperature, rock mass creep, the steel strand wires in the rock mass and change.To the research of prestress anchorage cable anchor mechanism, mainly adopt the strain of strain gage testing diverse location steel strand wires, the long term monitoring of anchor cable is still continued to use the way that proving ring is installed in anchored end.These two kinds of measurement means can't fully understand the stress distribution of anchor cable steel strand wires, the long term monitoring stabilizing effect is poor, sensitivity is low, the reason that produces this problem is, on the one hand since with anchor cable contact directly to as if rock soil mass complicated and changeable, anchor cable is embedded in the rock soil mass, and condition of work is very abominable, to waterproof, protection against the tide, the requirement for anticorrosion height of sensor.This brings very big difficulty for the monitoring and the research of anchor cable, has also directly influenced the reliability and the serviceable life of instrument.In recent years, the monitoring device that some anchor cable long-term work states also occur, the monitoring device and the method (patent No.: 02138980.2) promptly be one of them as fiber grating anchor cable long-term work state, it inserts the optical fiber that contains grating in monitored anchor cable, the accurate a plurality of fiber gratings that distribute are experienced the distribute ess-strain of each point of anchor cable steel strand wires respectively along the line, its catoptrical wavelength is changed, the reflected light that changes spreads out of from measure field through Transmission Fibers, survey the size of its changed wavelength by the fiber grating demodulation device, and to the electric signal of converting, deliver to secondary instrument, calculate the size and the whole anchor cable distribution of the ess-strain of accurate each measuring point that distributes of anchor cable by secondary instrument, the optical fiber that contains grating is pasted respectively or is welded in the sulculus that presets in the steel wire of anchor cable steel strand wires or pastes or be welded on inside and outside the steel wire of anchor cable steel strand wires, and the deficiency of this monitoring method and equipment thereof is:
1, the accurate raster count that distributes a plurality of fiber gratings of same anchor cable is subjected to the restriction of light source spectrum line width, is difficult to reflect the stress distribution situation of whole anchor cable comprehensively, and grating to scribe cost higher;
2, grating fibers (optical fiber that contains grating) has damaged steel wire though be arranged in the interior operate as normal that can protect optical fiber of the groove of steel wire, has reduced the holistic resistant behavior of anchor cable, has influenced the long-term work performance and the serviceable life of anchor cable.In addition, grating fibers is preset in the sulculus of central hair, and it is also convenient inadequately to operate;
Though 3, grating fibers is pasted or is welded on Steel Wire Surface and installs than convenient in the sulculus that is preset at central hair, when making grating, need remove the coating of optical fiber, the grating place is just very fragile like this, and damaging easily influences its operate as normal;
4, grating fibers imbed when detecting temporarily, both inaccurate, also convenient inadequately.
End is got up, and does not have effective measures that grating fibers is imbedded in the anchor cable of Geotechnical Engineering rationally, in good condition exactly, thereby, serviceable life of grating fibers and the accuracy meeting of anchor cable performance measurement is affected.
Summary of the invention
The technical problem to be solved in the present invention is: do not have effective measures that optical fiber is imbedded in the ground anchor cable rationally, in good condition in the monitoring device of above-mentioned fiber grating anchor cable long-term work state and method and same accurate a plurality of fiber grating that distribute of anchor cable are subjected to the restriction of light source spectrum line width because of its raster count, be difficult to reflect the stress distribution situation of whole anchor cable comprehensively, and grating scribe the cost problem of higher; A kind of anchor cable long-term work state monitoring apparatus and method thereof are provided, and these apparatus and method can be carried out long-term, stable tracking to anchor cable and be detected, and accurately reflect the stress distribution situation of whole anchor cable comprehensively; Between the central hair that is embedded in steel strand wires as the optical fiber or the optical fiber cable of optical fiber sensing system and the gap of lateral filament or place in the hawser between the steel wire gap, be not subjected to shearing action, not easy damaged or damage is not subjected to the restriction of construction environment.
The technical scheme that solves its above-mentioned technical matters is: a kind of anchor cable long-term work state monitoring apparatus, comprise optical fiber sensing system and the Transmission Fibers that is attached thereto, secondary instrument, it is characterized in that: described optical fiber sensing system is by inserting the distributed optical fiber sensing system that optical fiber in the monitored anchor cable or optical fiber cable constitute, described secondary instrument is to adopt the OTDR optical time domain reflectometer, described distributed optical fiber sensing system links to each other with Transmission Fibers, Transmission Fibers is by photoswitch and secondary instrument---optical time domain reflectometer is connected, and described distributed optical fiber sensing system can be optical fiber or the embedded optical fiber optical cable sensor-based system of single-core fiber optical cable formation or the external optical fiber cable sensor-based system that is made of the single-core fiber optical cable.
When described distributed optical fiber sensing system is embedded optical fiber optical cable sensor-based system, this optical fiber or optical fiber cable are secured between the gap of the central hair of steel strand wires and lateral filament or stick between steel wire gap in a branch of hawser, have the identical rotation direction and the lay pitch with steel strand wires or hawser;
When described distributed optical fiber sensing system is external optical fiber cable sensor-based system, this optical fiber cable is secured at outside steel strand wires or the hawser, optical fiber cable can have identical rotation direction with the steel wire of steel strand wires or hawser also can have opposite rotation direction with steel wire, optical fiber cable is drawn anchor cable by the bleeder vent on the anchor cup, inserts Transmission Fibers and links to each other with optical time domain reflectometer.
As another conversion of anchor cable long-term work state monitoring apparatus of the present invention, the outer protection steel pipe of internal diameter that also be with of the section of drawing of the optical fiber cable of described embedded optical fiber optical cable sensor-based system greater than optical fiber cable.
A kind of anchor cable long-term work state monitoring method, he may further comprise the steps:
A, lay optical fiber sensing system and connect optical fiber anchor cable long-term work state monitoring apparatus:
1), optical fiber or optical fiber cable are inserted constitutes the intelligent optical fiber anchor cable that contains distributed optical fiber sensing system in the monitored anchor cable;
2), with the optical fiber sensing system of intelligent optical fiber anchor cable with Transmission Fibers and secondary instrument---optical time domain reflectometer is connected;
B, modulation, transmission burst pulse light wave: from burst pulse light wave of LASER Light Source modulation of optical time domain reflectometer, and by coupling mechanism importing Transmission Fibers, and be sent to the optical fiber in the distributed optical fiber sensing system in the intelligent optical fiber anchor cable;
C, collect the sensor-based system feedback information: when intelligent optical fiber anchor cable distributed optical fiber sensing system is experienced the light burst pulse respectively and transmitted, because the inhomogeneous generation Rayleigh scattering and the reflected light of inside of optical fibre, and enter the OTDR signal processing system in optical fiber through coupling mechanism, light amplification detector;
" information " that E, analyzing and processing sensor-based system are passed back:
" information " that the OTDR signal processing system of secondary instrument---optical time domain reflectometer is passed back distributed optical fiber sensing system is analyzed, is judged, thereby obtain stressed, degree of impairment that optical fiber is buried place's anchor cable underground, and on LCDs, provide the size and location of optical fiber loss along the line.
A kind of conversion as anchor cable long-term work state monitoring apparatus of the present invention, secondary instrument in the described optical fiber anchor cable long-term work state monitoring apparatus can be replaced with light power meter without optical time domain reflectometer, this replacement is only for short-range optical fiber anchor cable, or uses under the not too high situation of system requirements.
Optical fiber anchor cable long-term work state monitoring apparatus of the present invention and method thereof are to go into optical fiber or optical fiber cable in that monitored anchor cable is mid-, form a distributed optical fiber sensing system, when anchor cable during because of stressed the distortion, sensor fibre is experienced the ess-strain of anchor cable, make along the scattered light and the catoptrical intensity of Optical Fiber Transmission and change, the scattering and the reflected light that change reach secondary instrument through Transmission Fibers---optical time domain reflectometer (OTDR), when the optical fiber somewhere stressed, there is joint, damage, it is higher to locate catoptrical intensity so, conversely, can according to the light signal result judge optical fiber bury underground the place anchor cable stressed, degree of impairment, this is a kind of distributed metering system.It is compared with the monitoring method and the device of the described existing fiber grating of background technology anchor cable long-term work state, has following beneficial effect:
The stress distribution situation that 1, can accurately comprehensively reflect whole anchor cable;
The measuring method of traditional point type, because the randomness of layouting, the most dangerous place may be increased to detect and count by omission, though improved result's reliability, workload greatly increases.And the Fibre Optical Sensor detection system of this programme is distributed detection system, and the optical fiber of whole Gen Suonei is sensor fibre, and when the anchor cable stress deformation, sensor fibre is experienced the ess-strain of anchor cable, thereby reflects the stress of anchor cable comprehensively.
2, between the gap of central hair that is embedded in steel strand wires as the optical fiber or the optical fiber cable of optical fiber sensing system and lateral filament or place in the hawser between the steel wire gap, be not subjected to shearing action, not easy damaged or damage is not subjected to the restriction of construction environment; External is not carved grating because optical fiber does not need to remove protective seam again, so not fragile.
3, secondary instrument adopts optical time domain reflectometer in the present invention's the anchor cable long-term work state monitoring apparatus---be called for short OTDR, inserting the interior optical fiber as sensor-based system of anchor cable is common telecommunication optical fiber, need not to do any processing, be beneficial to putting into of sensor-based system, also can make the anchor cable cable body that contains optical fiber or optical fiber cable sensor-based system in advance, optical time domain reflectometer is connected with Transmission Fibers by photoswitch, and the optical fiber in the anchor cable that can select arbitrarily to monitor is easy to operate.
The principle of this OTDR optical time domain reflectometer measuring optical fiber loss is similar to the radar detection principle: at first make light source produce the burst pulse light wave with light source of pulse producer modulation, be coupled into optical fiber through optical system, when this light burst pulse is transmitted in optical fiber, because the unevenness of inside of optical fibre will produce Rayleigh (Rayleigh) scattering, when the joint that runs into optical fiber and breakpoint will produce stronger reflection, some will return scattered light along optical fiber, passage in transit optical fiber directional coupler input photoelectric detector, become electric signal through photoelectric detector, send into display through amplification and signal Processing again, measure light wave by the clock of microprocessor control simultaneously and return required time, on display, draw the intensity of light wave reflection and scattering and reflection spot at the OTDR of optical fiber middle distance curve (referring to Fig. 7), thisly successively be called back-scattering light to input end transmission scattered light, this back-scattering light has just been sent input end back to " information " of each point on the optical fiber, light wave transmissions loss near input end is few, so the signal that scattering is returned is just strong, the local light wave transmissions loss far away from input end is big, the signal that scattering is returned just a little less than, as can be seen from Figure 7, at fibre-optical splice, the signal intensity that the catoptrical strength ratio Rayleigh scattering in welding point and breakpoint place causes is wanted big several dB, thereby on the OTDR curve, cause tangible surging, if there is defective (as welding) in the optical fiber somewhere or scratch because of the external world and to cause little change, then the backscattering light intensity just has certain decay at this place, so measure the time of arrival and the power attenuation size of backscattering light pulse, just can determine the position and the degree of defective and disturbance, among Fig. 7, a represents fibre-optical splice, b represents the welding point, and c represents breakpoint;
The distance of each point can be calculated by following formula:
d＝Δt/2(C/IOR)
In the formula:
D=range of a signal Δ t=reflection interval
The light velocity (2.99792458*10 in the C=vacuum
5Kilometer per second)
The tested optical fibre refractivity of IOR=(equal in the vacuum in the light velocity and optical fiber the ratio of the light velocity);
The AB section is to insert in the anchor cable as the optical fiber of sensor-based system among Fig. 7, and when anchor cable was not stressed, the light intensity decays value of this section optical fiber was Δ I
1When the anchor cable stress deformation, the light intensity decays value of this section optical fiber is Δ I
2, along with the increasing of anchor cable distortion, optical fiber is along with anchor cable is out of shape, and light intensity decays value Δ I increases, and can draw the relation of anchor cable ess-strain and luminous power output according to the light intensity decays value, thereby realizes the monitoring to anchor cable.
For guaranteeing the correct of measurement result, when using optical time domain reflectometer, need import the refractive index and the measurement range of tested optical fiber.
Be further described below in conjunction with the technical characterictic of drawings and Examples the present invention's intelligent anchor cable long-term work state monitoring apparatus.
Description of drawings:
Fig. 1: anchor cable long-term work state monitoring apparatus structural representation block diagram of the present invention;
Fig. 2: optical time domain reflectometer structural principle block diagram;
The installation distribution schematic diagram that the built-in optical fiber of Fig. 3: embodiment one described anchor cable long-term work state monitoring apparatus or optical fiber cable sensor-based system place steel strand wires;
The installation distribution schematic diagram that the built-in optical fiber of Fig. 4: embodiment two described anchor cable long-term work state monitoring apparatus or optical fiber cable sensor-based system place hawser;
The external optical fiber cable sensor-based system of Fig. 5: embodiment three described anchor cable long-term work state monitoring apparatus places the outer installation distribution schematic diagram of steel strand wires;
The external optical fiber cable sensor-based system of Fig. 6: embodiment three described anchor cable long-term work state monitoring apparatus places the outer installation distribution schematic diagram of hawser;
Fig. 7: optical fiber in the anchor cable and corresponding optical fiber scanning curve (OTDR) synoptic diagram.
Among the figure:
The 1-optical fiber sensing system; the 2-Transmission Fibers; the 3-photoswitch; the 4-secondary instrument; 5-sticks between steel strand wires central hair and the lateral filament gap; the optical fiber or the optical fiber cable that have the identical rotation direction and the lay pitch with steel strand wires; the 6-steel strand wires; the 7-internal diameter is greater than the protection steel pipe of Φ 0.9mm; 8-is arranged in the hawser gap; the multifiber or the optical fiber cable that have the identical rotation direction and the lay pitch with hawser; the 9-hawser; 10-sticks on the outer optical fiber cable that has the identical rotation direction and the lay pitch with steel strand wires of steel strand wires; 11-sticks on the outer optical fiber cable that has opposite rotation direction with steel strand wires of steel strand wires, and 12-sticks on the outer optical fiber cable that has the identical rotation direction and the lay pitch with hawser of hawser, and 13-sticks on the outer optical fiber cable that has opposite rotation direction with hawser of hawser.
Embodiment:
Embodiment one: the anchor cable long-term work state monitoring apparatus that adopts embedded optical fiber optical cable sensor-based system.
As Fig. 1, shown in Figure 3: the distributed optical fiber sensing system (1) that the present invention's anchor cable long-term work state monitoring apparatus is made of the optical fiber cable (5) of inserting in the monitored anchor cable, Transmission Fibers (2), photoswitch (3), secondary instrument---optical time domain reflectometer (4) is formed, described distributed optical fiber sensing system links to each other with Transmission Fibers (2), Transmission Fibers (2) is by photoswitch (3) and secondary instrument---optical time domain reflectometer (4) is connected, described optical fiber sensing system is the embedded optical fiber sensor system that common single-core fiber optical cable constitutes, and (referring to Fig. 3) and steel strand wires (6) have the identical rotation direction and the lay pitch between the central hair that this optical fiber cable (5) is secured at steel strand wires (6) and the gap of lateral filament.
As a kind of conversion of the embodiment of the invention one, in the distributed optical fiber sensing system (1) that described optical fiber cable (5) constitutes, the bar number of optical fiber cable (5) can be 1, also can be 2 or 3 or 4 or 5 or 6.
As a kind of conversion of the embodiment of the invention one, in the distributed optical fiber sensing system (1) that described optical fiber cable (5) constitutes, optical fiber cable (5) can all change optical fiber into.
Embodiment two: the anchor cable long-term work state monitoring apparatus that adopts embedded optical fiber optical cable sensor-based system.
As Fig. 1, shown in Figure 4: the distributed optical fiber sensing system (1) that the present invention's intelligent anchor cable long-term work state monitoring apparatus is made of the optical fiber cable (8) of inserting in the monitored anchor cable, Transmission Fibers (2), photoswitch (3), secondary instrument---optical time domain reflectometer (4) is formed, described distributed optical fiber sensing system links to each other with Transmission Fibers (2), Transmission Fibers (2) is by photoswitch (3) and secondary instrument---optical time domain reflectometer (4) is connected, described distributed optical fiber sensing system is the embedded optical fiber sensor system that common single-core fiber constitutes, this optical fiber cable (8) is secured between the interior steel wire gap of a branch of hawser (9) (referring to Fig. 4), with have the identical rotation direction and the lay pitch in the hawser (9), the quantity of optical fiber cable (8) is n bar (1≤n≤400).
As a kind of conversion of the embodiment of the invention two, in the distributed optical fiber sensing system (1) that described optical fiber cable (8) constitutes, optical fiber cable (8) can all change optical fiber into.
As a kind of conversion of the embodiment of the invention one, embodiment two, the outer steel pipe (7) (referring to Fig. 3) of internal diameter that also can be with of the optical fiber of described embedded sensor-based system or the section of drawing of optical fiber cable greater than Φ 0.9mm.
Embodiment three:
Adopt the anchor cable long-term work state monitoring apparatus of external optical fiber cable sensor-based system.The external distributed optical fiber sensing system that this anchor cable long-term work state monitoring apparatus is made of the optical fiber cable that places monitored anchor cable outside surface, Transmission Fibers (2), photoswitch (3), secondary instrument---optical time domain reflectometer (4) is formed, described distributed optical fiber sensing system links to each other with Transmission Fibers (2), Transmission Fibers (2) is by photoswitch (3) and secondary instrument---optical time domain reflectometer (4) is connected, the external optical fiber sensing system that described optical fiber sensing system constitutes for the single-core fiber optical cable, each optical fiber cable is drawn anchor cable by the bleeder vent on the anchor cup, inserts Transmission Fibers (8) and pass through photoswitch (3) to link to each other with optical time domain reflectometer (9); Described sensor fibre optical cable (10), (11) are secured at outside the steel strand wires, and wherein optical fiber cable (10) has identical rotation direction with the steel strand wires steel wire; Optical fiber (11) has opposite rotation direction (referring to Fig. 5) with the steel strand wires steel wire, and described sensor fibre optical cable (12), (13) are secured at outside the hawser, and optical fiber cable (12) has identical rotation direction with the hawser steel wire; Optical fiber (13) has opposite rotation direction (referring to Fig. 6) with the hawser steel wire.
Among embodiment one, embodiment two, the embodiment three, described Transmission Fibers is the optical fiber of model of the same race with the optical fiber of inserting in optical fiber in the anchor cable or the optical fiber cable, has identical refractive index, and the welding loss should be less than 1%.
Described optical time domain reflectometer comprises two parts, and the one, the MFI workbench, the one, the OTDR module, the MFI workbench possesses compact power, LCDs, heat-sensitive printer etc.; The OTDR module comprises (referring to Fig. 2) such as coupling mechanism, light amplification detector, LASER Light Source, OTDR signal processing systems.
The course of work is as follows: the OTDR module is received from after the measurement of the main frame instruction, promptly testing fiber is done repeatedly and again the result is passed to the MFI main frame after the scanning on average, the MFI main frame calculates after receiving measurement data, and the result is presented on the screen, and provide functions such as necessary metrology data analysis and file printout.
As a kind of conversion of the embodiment of the invention one, embodiment two, embodiment three, for short-range optical fiber anchor cable, under the not too high situation of system requirements, described secondary instrument---optical time domain reflectometer (4) available light power meter is replaced.
Embodiment four:
A kind of " anchor cable long-term work state monitoring method " that uses above-mentioned " anchor cable long-term work state monitoring apparatus ", he may further comprise the steps:
A, lay optical fiber sensing system and connect anchor cable long-term work state monitoring apparatus:
1), optical fiber or optical fiber cable are inserted constitutes the intelligent optical fiber anchor cable that contains distributed optical fiber sensing system (1) in the monitored anchor cable;
2), the optical fiber sensing system (1) of intelligent optical fiber anchor cable is linked to each other with Transmission Fibers (2), Transmission Fibers (2) is by photoswitch (3) and secondary instrument---optical time domain reflectometer (4) is connected;
B, modulation, transmission burst pulse light wave: from burst pulse light wave of LASER Light Source modulation of optical time domain reflectometer (4), and by coupling mechanism importing Transmission Fibers, and be sent to the optical fiber in the distributed optical fiber sensing system in the intelligent optical fiber anchor cable;
C, collect the sensor-based system feedback information: when intelligent optical fiber anchor cable distributed optical fiber sensing system is experienced the light burst pulse respectively and transmitted, because the inhomogeneous generation Rayleigh scattering and the reflected light of inside of optical fibre, and enter the OTDR signal processing system in optical fiber through coupling mechanism, light amplification detector;
" information " that E, analyzing and processing sensor-based system are passed back:
" information " that the OTDR signal processing system of secondary instrument---optical time domain reflectometer is passed back distributed optical fiber sensing system is analyzed, is judged, thereby obtain stressed, degree of impairment that optical fiber is buried place's anchor cable underground, and on LCDs, provide the size and location of optical fiber loss along the line.
As a kind of conversion of the embodiment of the invention four, if tested anchor cable is the optical fiber anchor cable that has contained distributed optical fiber sensing system, then omit " A-1), optical fiber cable inserted constitute the intelligent optical fiber anchor cable that contains distributed optical fiber sensing system in the monitored anchor cable; " step, directly from A-2) step begins to carry out.
Claims (5)
1. anchor cable long-term work state monitoring apparatus, comprise optical fiber sensing system and the Transmission Fibers that is attached thereto, secondary instrument, it is characterized in that: described optical fiber sensing system is by the distributed inline formula optical fiber sensing system (1) that is made of optical fiber or optical fiber cable of inserting in the monitored anchor cable, this optical fiber or optical fiber cable are secured between the gap of the central hair of steel strand wires (6) and lateral filament or stick between steel wire gap in a branch of hawser (9), have the identical rotation direction and the lay pitch with steel strand wires (6) or hawser (9); Described secondary instrument (4) is the OTDR optical time domain reflectometer, and described distributed inline formula optical fiber sensing system (1) links to each other with Transmission Fibers (2), and Transmission Fibers (2) is by photoswitch (3) and secondary instrument---the OTDR optical time domain reflectometer is connected.
2. anchor cable long-term work state monitoring apparatus according to claim 1, it is characterized in that: in the described distributed inline formula optical fiber sensing system (1), the embedded optical fiber of anchor cable has the n root---1≤n≤400 piece, optical fiber has the identical rotation direction and the lay pitch with the steel wire of steel strand wires or hawser, and optical fiber bonds together by the steel wire of cementing agent and steel strand wires or hawser.
3. according to right 1 described anchor cable long-term work state monitoring apparatus, it is characterized in that: described Transmission Fibers (2), photoswitch (3) and insert optical fiber in the anchor cable or optical fiber cable in optical fiber be the optical fiber of model of the same race, have identical refractive index, the welding loss should be less than 1%.
4. according to right 1 described anchor cable long-term work state monitoring apparatus, it is characterized in that: the outer steel pipe (7) of internal diameter that be with of the optical fiber of described distributed inline formula optical fiber sensing system or the section of drawing of optical fiber cable greater than Φ 0.9mm.
5. anchor cable long-term work state monitoring method, he may further comprise the steps:
A, lay optical fiber sensing system and connect anchor cable long-term work state monitoring apparatus:
1), the distributed inline formula optical fiber sensing system (1) that will constitute by optical fiber or optical fiber cable, adopt between the gap of central hair that optical fiber or optical fiber cable are sticked on steel strand wires (6) and lateral filament or the mode between steel wire gap in a branch of hawser (9) of sticking on is inserted the intelligent optical fiber anchor cable that formation in the monitored anchor cable contains distributed inline formula optical fiber sensing system;
2), the distributed inline formula optical fiber sensing system (1) of intelligent optical fiber anchor cable is linked to each other with Transmission Fibers (2), Transmission Fibers (2) is by photoswitch (3) and secondary instrument---optical time domain reflectometer (4) is connected;
B, modulation, transmission burst pulse light wave: from burst pulse light wave of LASER Light Source modulation of optical time domain reflectometer, and by coupling mechanism importing Transmission Fibers, and be sent to the optical fiber in the distributed inline formula optical fiber sensing system in the intelligent optical fiber anchor cable;
C, collect the sensor-based system feedback information: when intelligent optical fiber anchor cable distributed inline formula optical fiber sensing system is experienced the light burst pulse respectively and transmitted, because the inhomogeneous generation Rayleigh scattering and the reflected light of inside of optical fibre, and enter the OTDR signal processing system in optical fiber through coupling mechanism, light amplification detector;
" information " that E, analyzing and processing sensor-based system are passed back: " information " that the OTDR signal processing system of secondary instrument---optical time domain reflectometer is passed back distributed inline formula optical fiber sensing system is analyzed, is judged, thereby obtain stressed, degree of impairment that optical fiber is buried place's anchor cable underground, and on display, draw the intensity of light wave reflection and scattering and reflection spot at the OTDR of optical fiber middle distance curve.
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