CN102032962A - Fiber Bragg grating stress monitoring system - Google Patents
Fiber Bragg grating stress monitoring system Download PDFInfo
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- CN102032962A CN102032962A CN2009100240767A CN200910024076A CN102032962A CN 102032962 A CN102032962 A CN 102032962A CN 2009100240767 A CN2009100240767 A CN 2009100240767A CN 200910024076 A CN200910024076 A CN 200910024076A CN 102032962 A CN102032962 A CN 102032962A
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Abstract
The invention discloses a fiber Bragg grating stress monitoring system, comprising a light source, light-way dividers, fiber Bragg gratings and a light power meter. The system is characterized in that the light source is connected with the front light-way divider; the front light-way divider is connected with at least two or more optical fibers; each optical fiber is at least provided with a fiber Bragg grating; the other end of the optical fibers is connected with the rear light-way divider; the rear light-way divider is connected with the light power meter; particularly, the light source is a narrow pulse light source; and the lower limit of the wavelength of the light source sent by the light source is at least more than 1nm from the upper limit of the reflected wavelength region of the fiber Bragg gratings, thus forming the fiber Bragg grating stress monitoring system. The light power meter has responses whenever any one fiber Bragg grating on the fiber Bragg grating stress monitoring system drifts under the action of the tensile stress and covers the wavelength of the light signal sent by the light source, thus completing stress monitoring in larger range. The system has the advantages of simple and practical structure, strong environmental disturbance resistance and low operating and use costs and is suitable for popularization and use.
Description
Affiliated technical field
The present invention relates to a kind of optical fiber optical grating stress monitoring system, the monitoring system of stressing conditions is in a big way monitored in a kind of variation that utilizes fiber grating of saying so more specifically.
Background technology
It is enough for existing Fibre Optical Sensor kind, comprise fiber-optic grating sensor, optical fibre interferometric sensor, polytypes such as optical fiber micro-bending sensor, be characterized in the sensing sensitivity height, the equipment complexity, use, the operating cost height, make its application be subjected to very big restriction, particularly its higher sensitivity can respond the change of various environmental baselines in the use, as optical fibre interferometric sensor, its sensitivity is very high, but after being applied under the physical condition, find temperature, air pressure, environmental factors such as vibration are all influential to it, have to take multiple measure to prevent and reject the influence of these factors, make instrument and equipment be tending towards complicated, the operation use cost improves; On the other hand, some places do not need especially accurate equipment in the actual life, need understand under the situations such as power value whether stress reach setting as us, and the said equipment just seems and wasted one's talent on a petty job.In addition, if the said equipment is when wanting to monitor in a big way stressing conditions, and the complexity of system significantly improves, and practical application is very difficult.
Summary of the invention
The object of the present invention is to provide a kind of optical fiber optical grating stress monitoring system, this kind Fibre Optical Sensor had both had lower foundation and operating cost, can reduce Effect of Environmental again.
For realizing purpose of the present invention, a kind of optical fiber optical grating stress monitoring system that the present invention discloses, light source, optical branching device, fiber grating, light power meter, it is characterized in that, light source connects preceding optical branching device, preceding shunt is connected to few optical fiber more than two and two, has a fiber grating on the every optical fiber at least, the other end of optical fiber all is connected on the optical branching device of back then, back optical branching device is connected on the light power meter, particularly this light source is the burst pulse light source, and the upper limit in the lower limit of the wavelength of the light signal that this light source sends and fiber grating reflection wavelength zone has the above distance of 1nm at least, and this just forms an optical fiber optical grating stress monitoring system.Drift under the effect of any fiber grating on this optical fiber optical grating stress monitoring system in drawing stress, and when having covered the wavelength of the light signal that light source sends, on light power meter, all respond, thereby finish the monitoring of stress in a big way.
The main factor that influences fiber grating is stress and temperature, Temperature Influence is 10 degrees centigrade of every variations, the about 0.1nm of fiber grating drift, so, the environment that we live in the ordinary course of things, maximum can make the about 1.0nm of fiber grating drift, and stress can make the about 5nm of fiber grating drift, as long as so the wavelength of suitable light source is set, native system just can only monitor stress, and do not need the influence of considering that other factors cause.
Should be appreciated that the general introduction of front and following detailed description all are exemplary, rather than limitation of the present invention.
Description of drawings:
Fig. 1 is a synoptic diagram according to an embodiment of the invention.
Among the figure:
1-burst pulse light source, the 2-optical branching device, 3-optical fiber, the 4-fiber grating,
The 8-light power meter.
Embodiment
Fig. 1 is a synoptic diagram according to an embodiment of the invention.The light signal that burst pulse light source 1 sends, enter into optical fiber 3 and fiber grating 4 by preceding optical branching device 2, and then enter into light power meter 8 by optical fiber 3 and back optical branching device 2, when any one fiber grating 4 is subjected to force-responsive to external world, and the reflection wavelength of this fiber grating 4 zone drift and when having covered wavelength of optical signal, reflect by 4 pairs of light signals of this fiber grating, detect just minimizing of light signal at light power meter 8 like this, thereby reach the purpose of monitoring.
Can find out that from above-mentioned introduction the present invention is a kind of system of stressing conditions on a large scale that monitors, it is simple and practical, the temperature of surrounding environment, air pressure, vibration etc. do not have influence substantially to it, anti-environmental interference ability is strong, and operation and use cost are low, is suitable for promoting and using.
Certainly, the present invention is not limited to the embodiment that the front is introduced, and we can replace whole device with another kind of equivalent arrangements, and do not exceed scope of the present invention.
Claims (1)
1. optical fiber optical grating stress monitoring system, light source, optical branching device, fiber grating, light power meter, it is characterized in that, light source connects preceding optical branching device, preceding shunt is connected to few optical fiber more than two and two, has a fiber grating on the every optical fiber at least, the other end of optical fiber all is connected on the optical branching device of back then, back optical branching device is connected on the light power meter, particularly this light source is the burst pulse light source, and the upper limit in the lower limit of the wavelength of the light signal that this light source sends and fiber grating reflection wavelength zone has the above distance of 1nm at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100240767A CN102032962A (en) | 2009-09-27 | 2009-09-27 | Fiber Bragg grating stress monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100240767A CN102032962A (en) | 2009-09-27 | 2009-09-27 | Fiber Bragg grating stress monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102032962A true CN102032962A (en) | 2011-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100240767A Pending CN102032962A (en) | 2009-09-27 | 2009-09-27 | Fiber Bragg grating stress monitoring system |
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| CN (1) | CN102032962A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104048623A (en) * | 2014-06-25 | 2014-09-17 | 哈尔滨工程大学 | Microbend optical fiber sensor based on twin-core optical fiber |
-
2009
- 2009-09-27 CN CN2009100240767A patent/CN102032962A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104048623A (en) * | 2014-06-25 | 2014-09-17 | 哈尔滨工程大学 | Microbend optical fiber sensor based on twin-core optical fiber |
| CN104048623B (en) * | 2014-06-25 | 2016-08-17 | 哈尔滨工程大学 | A kind of optical fiber micro-bending sensor based on twin-core fiber |
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Application publication date: 20110427 |