CN102519623B - Distributed stress/temperature sensing optical fiber coordinate locating device - Google Patents
Distributed stress/temperature sensing optical fiber coordinate locating device Download PDFInfo
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- CN102519623B CN102519623B CN201110408968.4A CN201110408968A CN102519623B CN 102519623 B CN102519623 B CN 102519623B CN 201110408968 A CN201110408968 A CN 201110408968A CN 102519623 B CN102519623 B CN 102519623B
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Abstract
The invention relates to a locating device capable of measuring corresponding coordinate position of a distributed sensing optical fiber in a measured structure. A distributed stress/temperature sensing optical fiber coordinate locating device is characterized in that the locating device comprises two semi-circle annular members, wherein the bottom ends of two semi-circle annular members are connected in a buckling manner; the upper ends of two semi-circle annular members are connected in a buckling manner; two semi-circle annular members form an annular structure with an optical fiber through hole inside; two semi-circle annular members comprise outer surface layers and inner surface layers; the inner surface layers are arranged in the outer surface layers; an electric heating wire is arranged between each outer surface layer and each inner surface layer; a lead wire connected with a wire connection head of each electric heating wire is respectively connected with a corresponding output end point in a power supply control box; each outer surface layer is composed of an iron layer, an asbestos layer and a ceramic layer, which are arranged from inside to outside; and each inner surface layer is a glass layer. According to the method, a measurement circuit composed of the distributed sensing optical fiber can be subjected to accurate coordinate location.
Description
Technical field
The invention belongs to the Distributed Optical Fiber Sensing Techniques field in photoelectric technology, be specially a kind of locating device that can measure distributed sensing fiber respective coordinates position in by geodesic structure.
Background technology
Brillouin optical time domain analysis instrument (BOTDA) is that a kind of light that utilizes changes a kind of technology of coming measuring optical fiber strain (temperature) to change in optical fiber inscattering light frequency, can measure temperature and strain simultaneously, its principle of work is: the generating laser at optical fiber two ends injects a branch of pulsed light and a branch of continuous light to optical fiber respectively, when pulsed light and the difference on the frequency of continuous light are when in optical fiber, certain interval Brillouin shift equates, will there is excited Brillouin enlarge-effect in this region, energy occurs between two-beam and shift.When optical fiber temperature along the line changes or has axial strain, the frequency of the Brillouin scattering dorsad in optical fiber will be drifted about, the variation of the drift value of frequency and fibre strain and temperature is good linear relationship, therefore by the frequency drift amount of the Brillouin scattering dorsad in measuring optical fiber, just can obtain the distributed intelligence of optical fiber temperature along the line and strain.
BOTDA has realized the distributed continuous coverage of optical fiber, and optical fiber measurement point be take 0.1 meter conventionally as interval continuous distribution, so optical fiber measurement point all adopts a dimension coordinate to carry out mark.Distributed measurement is than point measurement, and measurement data is more, and information measured more comprehensively.But the Fibre Optical Sensor point in a dimension coordinate has also been brought difficulty by the three-dimensional fix of geodesic structure.The data that distributed sensing fiber measures only have to be accurately projected in and on geodesic structure, are just had the meaning of measurement, although all carry out mark with a dimension coordinate yet actual conditions are but most distributed sensing fibers, but surface does not all mark length coordinate, (or mark precision is more than 1 meter, can not reach the accurately requirement of location of coordinate), thereby be difficult to follow by the ad-hoc location of geodesic structure corresponding one by one, even if having the length mark of a small amount of distributed sensing fiber centimetre-sized, also can be difficult to meet due to following several factors the requirement of measuring accuracy:
1, distributed sensing fiber is laid in structure, and optical fiber surface all can be wrapped up completely by glue and other protective material conventionally, thereby can not carry out coordinate setting by reading mark length.
2, in optical fiber process of deployment, be applied in pretension and elongate to some extent, or because length variations occurs other factors, by causing physical length and marking the different of length, finally causing the deviation of measuring position;
3, the measuring circuit being comprised of distributed sensing fiber is after repeatedly continuing, and the difference between its physical length and mark length cannot be calculated, thereby on space, is difficult to carry out accurate coordinates location;
4, the positioning error of signal (FBG) demodulator can expand along with the increase of fiber lengths, thereby while causing long range measurements, the theoretical coordinate of measurement point is inconsistent with mark coordinate, causes mark coordinate unavailable.
In view of above reason, the difficulty of coordinate setting has reduced the measuring accuracy of distributed sensing fiber, thereby accurately determines that in the urgent need to a kind of new technology each is by the corresponding optical fiber measurement point coordinate of the specific location of geodesic structure.
Summary of the invention
The object of the present invention is to provide a kind of distributed strain/temperature sensing optical fiber coordinate locating device, the measuring circuit that this device can form distributed sensing fiber is carried out coordinate setting accurately.
For achieving the above object, the technical solution adopted in the present invention is: distributed strain/temperature sensing optical fiber coordinate locating device, it is characterized in that it comprises two semicircular rings shape members 2, the bottom of two semicircular rings shape members connects in the button mode of taking, the upper end of two semicircular rings shape members connects in the button mode of taking, and two semicircular rings shape members form interior for optical fiber is by the loop configuration in hole 6; Two semicircular rings shape members comprise extexine and interior surface layers 7, interior surface layers is positioned at extexine, heating wire is arranged between extexine and interior surface layers, the two ends of heating wire 8 are respectively equipped with connector lug 9, and the wire connected with the connector lug of every heating wire is connected with the interior corresponding exit point of power control box 5 respectively; Described extexine consists of iron or steel layer 10, asbestos layer 11 and ceramic layer 12, and iron or steel layer, asbestos layer and ceramic layer are arranged from the inside to the outside; Described interior surface layers is glassy layer.
The inside radius of described two semicircular rings shape members is 0.3cm-1cm, and the external radius of two semicircular rings shape members is 2cm-3cm, and the length of two semicircular rings shape members is 5cm-25cm.
Described heating wire is 1-20 root.
The shape of distributed strain/temperature sensing optical fiber coordinate locating device also can be square-outside and round-inside, and (inner circle is that optical fiber passes through hole; Layer of structure is same as described above).Distributed strain/temperature sensing optical fiber coordinate locating device, it is characterized in that it comprises two halves square shape member, the bottom of two halves square shape member connects in the button mode of taking, and the upper end of two halves square shape member connects in the button mode of taking, and two halves square shape member is that optical fiber is by the structure in hole in forming; Two halves square shape member comprises extexine and interior surface layers, interior surface layers is positioned at extexine, heating wire is arranged between extexine and interior surface layers, the two ends of heating wire are respectively equipped with connector lug, and the wire connected with the connector lug of every heating wire is connected with exit point corresponding in power control box respectively; Described extexine consists of iron or steel layer, asbestos layer and ceramic layer, and iron or steel layer, asbestos layer and ceramic layer are arranged from the inside to the outside; Described interior surface layers is glassy layer.
The present invention utilizes the characteristic of distributed sensing fiber to temperature variation sensitivity, by changing the method for local optical fiber environment temperature of living in, obtain by the optical fiber measurement point coordinate of geodesic structure specific location, its principle is: when distributed sensing fiber is laid in the middle of entering by geodesic structure, form after measuring circuit, within a relatively short time period, by geodesic structure, can be there is not larger stress deformation, and the residing variation of ambient temperature of optical fiber is also very little, thereby the optical fiber measurement data of obtaining by signal (FBG) demodulator are kept stables.So, as long as can, the changing rapidly by the environment temperature of geodesic structure ad-hoc location of short time, just can cause the abnormal of these place's optical fiber measurement point data.By the method, can obtain rapidly optical fiber and place, structural correspondence position, facilitate the processing of follow-up data, meanwhile, due to the accurate correspondence of position, the data that measure comparatively speaking precision are also greatly improved.
The invention has the beneficial effects as follows: the measuring circuit that this device can form distributed sensing fiber be carried out coordinate setting accurately, exactly by optical fiber measurement data projection to by the ad-hoc location of geodesic structure, thereby reduce measuring error.
The outside surface of locating device is usingd pottery, asbestos targetedly as material, not only can effectively reach heat insulation effect, has also played heat-blocking action simultaneously, scalds operator while preventing from heating work.Heating wire is laid along even circumferential, and intensification optical fiber is accepted the stepless action of heating wire, and interior ring surface is glass material, has avoided heating wire to damage optical fiber to the direct effect of optical fiber.Lax optical fiber is smoothed out with the fingers straight through the endoporus (optical fiber passes through hole) of locating device, be convenient to accurately look for structural correspondence position.Two semicircular rings shape members connect in the button mode of taking, and are convenient to dismounting and use, when optical fiber is laid in body structure surface, can only use a semicircular rings shape member, device is tipped upside down on to body structure surface, and optical fiber, by semicircle ring-type member, is accepted the heat effect of heating wire.In addition, the heat effect respectively of every heating wire has also facilitated the control of temperature or heat, the in the situation that of circumstance complication, also can regulate acquisition relevant information according to heating wire working quantity.
Accompanying drawing explanation
Fig. 1 is the external view of locating device of the present invention;
Fig. 2 is that Fig. 1 is along the cut-open view of A-A line;
In figure: 1-optical fiber (distributed strain/temperature sensing optical fiber), the semicircle ring-type member of 2-, 3-handle, 4-detains fastener member, 5-power control box, 6-optical fiber passes through hole, 7-interior surface layers (or claiming endosexine), 8-heating wire, 9-connector lug, 10-iron or steel layer, 11-asbestos layer, 12-ceramic layer.
Embodiment
Embodiment 1:
As Fig. 1, shown in Fig. 2, distributed strain/temperature sensing optical fiber coordinate locating device comprises two semicircular rings shape members 2 (i.e. 2 semicircle ring-type members 2), the bottom of two semicircular rings shape members connects (button fastener member 4 is all established in bottom) in the common button mode of taking, the upper end of two semicircular rings shape members connects (upper end is equipped with handle 3) in the common button mode of taking, two semicircular rings shape members form interior for optical fiber is by the loop configuration in hole 6, the inside radius of two semicircular rings shape members is 1cm (internal diameter of loop configuration is 2cm), the external radius of two semicircular rings shape members is 3cm (external diameter of loop configuration is 6cm), the length of two semicircular rings shape members is 25cm, two semicircular rings shape members comprise extexine and interior surface layers 7, interior surface layers is positioned at extexine and (between interior surface layers and extexine, adopts plug-in type to be connected, or it is not fixing), heating wire is arranged in (heating wire is for heating) between extexine and interior surface layers, the two ends of heating wire 8 are respectively equipped with connector lug 9 (or small jig), heating wire is that (the present embodiment adopts 12 to 1-20 root, is uniformly distributed along the circumference, concrete radical is determined as required), the wire connected with the connector lug of every heating wire is connected with the interior corresponding exit point of power control box 5 respectively, described extexine consists of irony layer 10, asbestos layer 11 and ceramic layer 12, and irony layer, asbestos layer and ceramic layer are arranged (being designed with like this heat-insulation and heat-preservation being beneficial to after energising) from the inside to the outside, described interior surface layers is glassy layer (can effectively transfer heat to optical fiber).
Distributed strain/temperature sensing optical fiber coordinate locating method, it comprises the steps:
1) in the required measuring circuit by geodesic structure, arrange distributed strain/temperature sensing optical fiber (to distributed sensing fiber), and by the specific location of the required measurement of geodesic structure, locating device being set, distributed strain/temperature sensing optical fiber passes from locating device;
2) while measuring, locating device energising, locating device, to distributed strain/temperature sensing optical fiber distribute heat, by changing local optical fiber environment temperature of living in, obtains by the optical fiber measurement point coordinate of the specific location of the required measurement of geodesic structure.
Test as stated above, result shows the rate of accuracy reached to 100% of said method.
Heating wire can effectively be determined its working quantity by external power control box, that is to say that every heating wire is independently, can optionally connect heating wire according to on-the-spot needs, can conveniently control like this variation of temperature.Two semicircular rings shape members connect together by the button mode of taking, can separate at any time (can also use separately), optical fiber is passed through by interior ring, after energising, locating device (steady arm) internal temperature evenly increases, and fiber optic temperature also evenly increases thereupon, while using the temperature of BOTDA signal (FBG) demodulator measuring optical fiber, can occur the steep crest rising at the regional area of measuring curve, the coordinate at crest peak value place, is the coordinate of optical fiber on steady arm central point.It is confirmable due to steady arm central point and optical fiber, being laid in structural position relationship, therefore just can on measurement curve, mark the position of structure measurement point, and the numerical value of this measurement point is considered as to the measured value in this position by geodesic structure.
Make summary
1, extexine is made: making diameter is 4cm (radius is 2cm), length is the semicircular rings iron plate of 25cm, best if any stainless steel, to prevent that iron rust from affecting serviceable life and the outward appearance of member, at semicircular rings iron plate outside surface, be coated with one deck glue, affix one deck asbestos, then at asbestos layer upper berth pottery (external radius of two semicircular rings shape members is 3cm).After glue bonds completely, at iron plate coboundary, weld the button fastener member of a handles formula, button fastener member of lower limb welding, handle and button fastener member respectively account for half on two semicircular rings iron plates, in the common button mode of taking, connect.As Fig. 1, shown in Fig. 2.
2, at above-mentioned half-cylindrical row member two ends, respectively add an annular roof plate, and the small jig (connector lug) of pressing even interval mounting clamp power taking heated filament on top board along circumference, two is corresponding to be arranged, this small jig is two electrodes of electric furnace heating wire, pressed both sides correspondence position pairing, heating wire is arranged on to the inside surface of semicircular rings iron plate, these heating wire are all separate connection power leads, by small jig, form loop, and be drawn to external power control box by wire unification.
3, treat that this member completes, pack interior surface layers (glass cover-plate) into, also not exclusively affixed between glass cover-plate and aforementioned semicircular ring top board, take to pull and push mode and install or unload glass cover-plate, when construction, can replace at any time the heating wire having damaged like this.
Embodiment 2:
Substantially the same manner as Example 1, difference is: the length of two semicircular rings shape members is 5cm.
By method described in embodiment 1, test, result shows rate of accuracy reached to 100%.
Embodiment 3:
Substantially the same manner as Example 1, difference is: the inside radius of described two semicircular rings shape members is 0.3cm, and the radius of semicircular rings iron plate is 1cm, and the external radius of two semicircular rings shape members is 2cm.
By method described in embodiment 1, test, result shows rate of accuracy reached to 100%.
Embodiment 4:
Substantially the same manner as Example 1, difference is: described extexine consists of steel layer 10, asbestos layer 11 and ceramic layer 12.
By method described in embodiment 1, test, result shows rate of accuracy reached to 100%.
Embodiment 5:
Distributed strain/temperature sensing optical fiber coordinate locating device, it is semicircle ring-type member, semicircle ring-type member comprises extexine and interior surface layers 7, interior surface layers is positioned at extexine, heating wire is arranged between extexine and interior surface layers, the two ends of heating wire 8 are respectively equipped with connector lug 9, and the wire connected with the connector lug of every heating wire is connected with the interior corresponding exit point of power control box 5 respectively; Described extexine consists of iron or steel layer 10, asbestos layer 11 and ceramic layer 12, and iron or steel layer 10, asbestos layer 11 and ceramic layer 12 are arranged from the inside to the outside; Described interior surface layers is glassy layer.
By method described in embodiment 1, test, result shows rate of accuracy reached to 100%.
Embodiment 6:
Distributed strain/temperature sensing optical fiber coordinate locating device, it comprises two halves square shape member (2 en shaped element), the bottom of two halves square shape member connects in the button mode of taking, the upper end of two halves square shape member connects in the button mode of taking, and two halves square shape member is that optical fiber is by the structure in hole in forming; Two halves square shape member comprises extexine and interior surface layers, interior surface layers is positioned at extexine, the inside surface of interior surface layers is semicircle (or for square), heating wire is arranged between extexine and interior surface layers, the two ends of heating wire are respectively equipped with connector lug, and the wire connected with the connector lug of every heating wire is connected with exit point corresponding in power control box respectively; Described extexine consists of iron or steel layer, asbestos layer and ceramic layer, and iron or steel layer, asbestos layer and ceramic layer are arranged from the inside to the outside; Described interior surface layers is glassy layer.
By method described in embodiment 1, test, result shows rate of accuracy reached to 100%.
Embodiment 7:
Distributed strain/temperature sensing optical fiber coordinate locating device, it is en shaped element, en shaped element comprises extexine and interior surface layers, interior surface layers is positioned at extexine, the inside surface of interior surface layers is semicircle (or for square), heating wire is arranged between extexine and interior surface layers, and the two ends of heating wire are respectively equipped with connector lug, and the wire connected with the connector lug of every heating wire is connected with exit point corresponding in power control box respectively; Described extexine consists of iron or steel layer, asbestos layer and ceramic layer, and iron or steel layer, asbestos layer and ceramic layer are arranged from the inside to the outside; Described interior surface layers is glassy layer.
By method described in embodiment 1, test, result shows rate of accuracy reached to 100%.
Claims (5)
1. distributed strain/temperature sensing optical fiber coordinate locating device, it is characterized in that it comprises two semicircular rings shape members (2), the bottom of two semicircular rings shape members connects in the button mode of taking, the upper end of two semicircular rings shape members connects in the button mode of taking, and two semicircular rings shape members form interior for optical fiber is by the loop configuration in hole (6); Two semicircular rings shape members comprise extexine and interior surface layers (7), interior surface layers is positioned at extexine, heating wire is arranged between extexine and interior surface layers, the two ends of heating wire (8) are respectively equipped with connector lug (9), and the wire connected with the connector lug of every heating wire is connected with exit point corresponding in power control box (5) respectively; Described extexine consists of iron or steel layer (10), asbestos layer (11) and ceramic layer (12), and iron or steel layer (10), asbestos layer (11) and ceramic layer (12) are arranged from the inside to the outside; Described interior surface layers is glassy layer.
2. distributed strain/temperature sensing optical fiber coordinate locating device according to claim 1, it is characterized in that: the inside radius of described two semicircular rings shape members is 0.3cm-1cm, the external radius of two semicircular rings shape members is 2cm-3cm, and the length of two semicircular rings shape members is 5cm-25cm.
3. distributed strain/temperature sensing optical fiber coordinate locating device according to claim 1, is characterized in that: described heating wire is 1-20 root.
4. distributed strain/temperature sensing optical fiber coordinate locating device, it is characterized in that it comprises two halves square shape member, the bottom of two halves square shape member connects in the button mode of taking, and the upper end of two halves square shape member connects in the button mode of taking, and two halves square shape member is that optical fiber is by the structure in hole in forming; Two halves square shape member comprises extexine and interior surface layers, interior surface layers is positioned at extexine, heating wire is arranged between extexine and interior surface layers, the two ends of heating wire are respectively equipped with connector lug, and the wire connected with the connector lug of every heating wire is connected with exit point corresponding in power control box respectively; Described extexine consists of iron or steel layer, asbestos layer and ceramic layer, and iron or steel layer, asbestos layer and ceramic layer are arranged from the inside to the outside; Described interior surface layers is glassy layer.
5. distributed strain/temperature sensing optical fiber coordinate locating device, it is characterized in that it is semicircle ring-type member, semicircle ring-type member comprises extexine and interior surface layers (7), interior surface layers is positioned at extexine, heating wire is arranged between extexine and interior surface layers, the two ends of heating wire (8) are respectively equipped with connector lug (9), and the wire connected with the connector lug of every heating wire is connected with exit point corresponding in power control box (5) respectively; Described extexine consists of iron or steel layer (10), asbestos layer (11) and ceramic layer (12), and iron or steel layer (10), asbestos layer (11) and ceramic layer (12) are arranged from the inside to the outside; Described interior surface layers is glassy layer.
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| CN103424137B (en) * | 2013-08-06 | 2016-09-14 | 神华集团有限责任公司 | Position calibration method and device thereof for distributed optical fiber sensing system |
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| CN110967057B (en) * | 2019-12-20 | 2021-08-17 | 中国地质大学（武汉） | Device and method for calibrating optical fiber strain and temperature coefficient |
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