CN103808338A - Large dynamic range optical fiber sensing device based on mode field diameter difference - Google Patents
Large dynamic range optical fiber sensing device based on mode field diameter difference Download PDFInfo
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- CN103808338A CN103808338A CN201210458762.7A CN201210458762A CN103808338A CN 103808338 A CN103808338 A CN 103808338A CN 201210458762 A CN201210458762 A CN 201210458762A CN 103808338 A CN103808338 A CN 103808338A
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Abstract
The invention discloses a large dynamic range optical fiber sensing device based on mode field diameter difference. The large dynamic range optical fiber sensing device comprises an upper toothed board, a lower toothed board, A-side deforming teeth, B-side deforming teeth, a first signal optical fiber, a second signal optical fiber, a first 1*2 coupler, a testing unit and a processing unit. The upper toothed board and the lower toothed board are opposite to each other; a plurality of the A-side deforming teeth are evenly distributed on the lower surface of the upper toothed board, a plurality of the B-side deforming teeth are evenly distributed on the upper surface of the lower toothed board, the first signal optical fiber and the second signal optical fiber are clamped between the A-side deforming teeth and the B-side deforming teeth side by side, and the difference between the mode field diameters of the first signal optical fiber and the second signal optical fiber is smaller than 5%; the testing unit is connected with one ends of both the first signal optical fiber and the second signal optical fiber through the first 1*2 coupler and also connected with the processing unit. The large dynamic range optical fiber sensing device based on the mode field diameter difference is high in sensitivity and has a higher potential for being applied to complex environments.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, relate to a kind of based on light signal strength change, by adopting the discrepant optical fiber of more than two or two mode field diameter to realize great dynamic range fibre-optical sensing device, be specifically related to a kind of great dynamic range fibre-optical sensing device based on mode field diameter difference.
Background technology
Fibre Optical Sensor dress device becomes one of focus of the outer research of Present Domestic because traditional sensors relatively has plurality of advantages, the bending wherein changing based on light signal strength, the sensing device of micro-curved principle with respect to other Fibre Optical Sensors have simple in structure, light path sealing, cost low, be easy to build the advantages such as distributed sensing device.Though microbending optical fiber sensor has had larger test dynamic range, but when to the large deformation such as landslide, rubble flow, earthquake and large-sized artificial buildings, long-term monitoring, still can run into the problem of test dynamic range deficiency, if can address this problem, the microbend fiber sensing device serviceable life of having laid can be extended on the one hand, the cost of use, maintenance and system can be significantly reduced again.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency of the prior art, a kind of great dynamic range fibre-optical sensing device based on mode field diameter difference is provided, utilize the difference of the mode field diameter of two optical fiber, light signal under identical wavelength is two same flexure or micro-stooping, loss while transmission in two optical fiber varies in size, thereby can expand the dynamic range of bending or microbend fiber sensing device, bending or the high-precision feature of microbend fiber sensing device have been kept, do not affect again its advantage cheaply, for promoting the use of of such fibre-optical sensing device provides good basis.
For achieving the above object, the technical solution used in the present invention is: a kind of great dynamic range fibre-optical sensing device based on mode field diameter difference, it is characterized in that: comprise gullet plate, lower gullet plate, A side distortion tooth, B side distortion tooth, first signal optical fiber, secondary signal optical fiber, the one 1X2 coupling mechanism, test cell and processing unit, described upper gullet plate and lower gullet plate are oppositely arranged, the quantity of described A side distortion tooth and B side distortion tooth is multiple, multiple described A side distortion teeth are evenly laid on the lower surface of gullet plate, multiple described B side distortion teeth are evenly laid on the upper surface of lower gullet plate, described A side distortion tooth and corresponding laying of B side distortion tooth, described first signal optical fiber and secondary signal optical fiber are held between A side distortion tooth and B side distortion tooth side by side, the difference of the mode field diameter of described first signal optical fiber and secondary signal optical fiber is not less than 5%, described test cell is optical time domain reflectometer or light source-light power meter, and described test cell is all connected with one end of secondary signal optical fiber with first signal optical fiber by a 1X2 coupling mechanism, and described test cell is also connected with processing unit.
The above-mentioned great dynamic range fibre-optical sensing device based on mode field diameter difference, it is characterized in that: the other end of described first signal optical fiber and secondary signal optical fiber is all connected with test cell by the 2nd 1X2 coupling mechanism, described the 2nd 1X2 coupling mechanism is also connected with processing unit.
The present invention compared with prior art has the following advantages:
1, great dynamic range fibre-optical sensing device of the present invention, by settling first signal optical fiber and the secondary signal optical fiber of two mode field diameter differences more than 5%, just can significantly increase the test dynamic range of fibre-optical sensing device, improve precision, extended serviceable life of fibre-optical sensing device.
2, the present invention is not only applicable to the fibre-optical sensing device of bending or micro-curved type, as long as the fibre-optical sensing device based on light signal strength, relevant to wavelength of optical signal, all can adopt said apparatus to reach the object that increases test dynamic range.
3, great dynamic range fibre-optical sensing device of the present invention, simple in structure, precision is high, long service life, be beneficial to and promote the use of.
In sum, the present invention is simple in structure, reasonable in design, highly sensitive, result of use is good, has the fibre-optical sensing device of great dynamic range, can have larger potentiality and adapt to complicated actual application environment, has better precision and longer serviceable life.
Below by drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first embodiment of the present invention.
Fig. 2 is the A-A cut-open view of Fig. 1.
Fig. 3 is the structural representation of the second embodiment of the present invention.
Description of reference numerals:
3-1-one 1X2 coupling mechanism; 3-2-two 1X2 coupling mechanism; 4-1-A side distortion tooth;
4-2-B side distortion tooth; 5-test cell; 6-1-first signal optical fiber;
6-2-secondary signal optical fiber; 7-processing unit; 9-1-upper gullet plate;
9-2-lower gullet plate.
Embodiment
Embodiment 1
As depicted in figs. 1 and 2, a kind of great dynamic range fibre-optical sensing device based on mode field diameter difference, comprise gullet plate 9-1, lower gullet plate 9-2, A side distortion tooth 4-1, B side distortion tooth 4-2, first signal optical fiber 6-1, secondary signal optical fiber 6-2, the one 1X2 coupling mechanism 3-1, test cell 5 and processing unit 7, described upper gullet plate 9-1 and lower gullet plate 9-2 are oppositely arranged, the quantity of described A side distortion tooth 4-1 and B side distortion tooth 4-2 is multiple, multiple described A side distortion tooth 4-1 are evenly laid on the lower surface of gullet plate 9-1, multiple described B side distortion tooth 4-2 are evenly laid on the upper surface of lower gullet plate 9-2, described A side distortion tooth 4-1 and corresponding laying of B side distortion tooth 4-2, described first signal optical fiber 6-1 and secondary signal optical fiber 6-2 are held between A side distortion tooth 4-1 and B side distortion tooth 4-2 side by side, the difference of the mode field diameter of described first signal optical fiber 6-1 and secondary signal optical fiber 6-2 is not less than 5%, described test cell 5 is optical time domain reflectometer or light source-light power meter, and described test cell 5 is all connected with one end of secondary signal optical fiber 6-2 with first signal optical fiber 6-1 by a 1X2 coupling mechanism 3-1, and described test cell 5 is also connected with processing unit 7.
In the present embodiment, first signal optical fiber 6-1 and secondary signal optical fiber 6-2 are all held between gullet plate 9-1 and lower gullet plate 9-2 and synchronize variation, due to the difference of the mode field diameter of first signal optical fiber 6-1 and secondary signal optical fiber 6-2, in identical bending or micro-curved state, it has larger difference in attenuation to the light signal that causes identical wavelength, under a certain case of bending, decay greatly when not allowing light signal to pass through when the large signal optical fibre of mode field diameter, the signal optical fibre that mode field diameter is little still can allow identical light signal to pass through; Otherwise, in the time that the large signal optical fibre of mode field diameter has attenuation to light signal under a certain case of bending, the little signal optical fibre of mode field diameter is not to there is no the decay of light to light signal under identical case of bending, in the time that first signal optical fiber 6-1 and secondary signal optical fiber 6-2 are held on side by side the crooked sensory unit forming between gullet plate 9-1 and lower gullet plate 9-2 and are monitored simultaneously, just can expand the dynamic range of the monitoring of this fibre-optical sensing device like this; Certainly can further increase by increasing the discrepant signal optical fibre of more mode field diameter the dynamic range of this device.
Embodiment 2
As shown in Figure 3, the present embodiment is as different from Example 1: the other end of described first signal optical fiber 6-1 and secondary signal optical fiber 6-2 is all connected with test cell 5 by the 2nd 1X2 coupling mechanism 3-2, and described the 2nd 1X2 coupling mechanism 3-2 is also connected with processing unit 7.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every any simple modification, change and equivalent structure transformation of above embodiment being done according to the technology of the present invention essence, all still belongs in the protection domain of technical solution of the present invention.
Claims (2)
1. the great dynamic range fibre-optical sensing device based on mode field diameter difference, it is characterized in that: comprise gullet plate (9-1), lower gullet plate (9-2), A side distortion tooth (4-1), B side distortion tooth (4-2), first signal optical fiber (6-1), secondary signal optical fiber (6-2), the one 1X2 coupling mechanism (3-1), test cell (5) and processing unit (7), described upper gullet plate (9-1) and lower gullet plate (9-2) are oppositely arranged, the quantity of described A side distortion tooth (4-1) and B side distortion tooth (4-2) is multiple, multiple described A side distortion teeth (4-1) are evenly laid on the lower surface of gullet plate (9-1), multiple described B side distortion teeth (4-2) are evenly laid on the upper surface of lower gullet plate (9-2), described A side distortion tooth (4-1) and B side distortion tooth (4-2) are corresponding to be laid, described first signal optical fiber (6-1) and secondary signal optical fiber (6-2) are held between A side distortion tooth (4-1) and B side distortion tooth (4-2) side by side, the difference of the mode field diameter of described first signal optical fiber (6-1) and secondary signal optical fiber (6-2) is not less than 5%, described test cell (5) is optical time domain reflectometer or light source-light power meter, described test cell (5) is all connected with one end of secondary signal optical fiber (6-2) with first signal optical fiber (6-1) by a 1X2 coupling mechanism (3-1), and described test cell (5) is also connected with processing unit (7).
2. the great dynamic range fibre-optical sensing device based on mode field diameter difference according to claim 1, it is characterized in that: the other end of described first signal optical fiber (6-1) and secondary signal optical fiber (6-2) is all connected with test cell (5) by the 2nd 1X2 coupling mechanism (3-2), described the 2nd 1X2 coupling mechanism (3-2) is also connected with processing unit (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210458762.7A CN103808338A (en) | 2012-11-14 | 2012-11-14 | Large dynamic range optical fiber sensing device based on mode field diameter difference |
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| CN201210458762.7A CN103808338A (en) | 2012-11-14 | 2012-11-14 | Large dynamic range optical fiber sensing device based on mode field diameter difference |
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| CN103808338A true CN103808338A (en) | 2014-05-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109141701A (en) * | 2018-09-29 | 2019-01-04 | 余海波 | sensor and wearable device |
| CN110023732A (en) * | 2016-11-22 | 2019-07-16 | 骁阳网络有限公司 | The detection of gain and the exaggeration of damage in unidirectional OTDR trace |
-
2012
- 2012-11-14 CN CN201210458762.7A patent/CN103808338A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110023732A (en) * | 2016-11-22 | 2019-07-16 | 骁阳网络有限公司 | The detection of gain and the exaggeration of damage in unidirectional OTDR trace |
| CN109141701A (en) * | 2018-09-29 | 2019-01-04 | 余海波 | sensor and wearable device |
| CN109141701B (en) * | 2018-09-29 | 2023-11-24 | 余海波 | Sensor and wearable equipment |
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Application publication date: 20140521 |