CN102620759A - White light interference photoelectric system - Google Patents
White light interference photoelectric system Download PDFInfo
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- CN102620759A CN102620759A CN2012100883034A CN201210088303A CN102620759A CN 102620759 A CN102620759 A CN 102620759A CN 2012100883034 A CN2012100883034 A CN 2012100883034A CN 201210088303 A CN201210088303 A CN 201210088303A CN 102620759 A CN102620759 A CN 102620759A
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- white light
- optical fiber
- fiber coupler
- interference
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Abstract
The invention relates to a white light interference photoelectric system. The technical scheme includes that the white light interference photoelectric system comprises a white light source, a photoelectric detector, an optical fiber coupler, and a sensing optical fiber. The optical fiber coupler is a 2x2 optical fiber coupler, two ends of the sensing optical fiber are connected respectively with two ports of the optical fiber coupler in the same direction so as to form an optical closed circuit; the white light source and the photoelectric detector are connected to the other side of the optical fiber coupler respectively; and white light emitted from the white light source enters the optical closed circuit clockwise and anticlockwise through the optical fiber coupler, passes the sensing optical fiber which is used for inducting disturbing signals, and returns to the optical fiber coupler and forms interference signals which are received by the photoelectric detector. The white light interference photoelectric system solves the problem of insufficiency and instability of interference signals caused by birefringence phenomenon generated randomly in the optical fiber in the existing interference system, and has the advantages that the interference signals are stable and the photoelectric system is not influenced by environmental factors.
Description
Technical field
The present invention relates to optical fiber sensing technology, be specifically related to the measuring system of optical fiber interference signal.
Background technology
The present invention is mainly based on principle of optical interference.This fiber optic interferometric system is at same optical fiber, and the light from same lasing light emitter that promptly two bundles are propagated along both forward and reverse directions in the optics closed-loop path forms interferes.When the optics closed-loop path receives external disturbance, the light path of propagating along both forward and reverse directions will be affected.Although the influence that two-way light receives is the same, the time of this influence arrival detector is different.The interference light intensity that measures on the detector will be affected, thereby cause corresponding variation response.
With traditional optical closed-loop path interference ring is example; As shown in Figure 1; The light that laser instrument sends divides clockwise and counterclockwise both direction to get into the optics closed-loop path through the 2x2 coupling mechanism, converges to detector formation interference signal again through disturbing signal induction optical fiber and 2x2 coupling mechanism.Any disturbance is applied on the optics closed-loop path, all can cause the variation φ (t) of the phase place of propagates light, and the mistiming that this change to arrive detector is determined by position and the length of optics closed-loop path that disturbance occurs on the optics closed-loop path.Mistiming is big more, and the interference electric current that detector detects changes more greatly
I(t)＝I
0(2-2cos(Δφ(t)+φ
0))， (1)
Δ φ (t)=φ (t-t in the following formula
1)-φ (t-t
2),
L
1For disturbance point CW in the optics closed-loop path to the distance of 2x2 coupling mechanism, L
2For disturbance point in the optics closed-loop path counterclockwise arrives the distance of 2x2 coupling mechanism, c is the speed that light is propagated in optical fiber, I
0Detector is from a light intensity that output terminal receives of coupling mechanism, φ when interfering for not having
0Be initial phase difference, the 2x2 coupling mechanism will bring differing of π, but the birefringence effect in the optical fiber also can have influence on φ
0
When Δ φ hour, being changed to of interference light intensity
ΔI(t)≈2I
0sin(φ
0)Δφ(t)+I
0cos(φ
0)(Δφ(t))
2 (2)
Since the characteristic of 2x2 coupling mechanism, φ when the birefringence effect of not considering in the optical fiber
0=π, first disappearance on following formula the right, so in the optics closed-loop path fiber optic interferometric system to the response of small sample perturbations be disturbance square, rather than linear response, the difficult variation that observes interference signal.
Sensor fibre is made with single-mode fiber usually in this optics closed-loop path, optical fiber meeting bend by pressure in the Construction Arrangement, and birefringence effect wherein is that inevitably this birefringence effect will influence φ
0Value.The birefringence effect that this specific character of optics closed-loop path interference ring makes the power of its interference signal also formed in the optical fiber of optics closed-loop path influences; Can make the rightabout light experience of the two-way different optical path in the optics closed-loop path, although after they converge again identical polarization state is arranged still.
Optical fiber distortion curvature, the temperature variation when birefringence effect in the optical fiber is installed, put on the influence of the factors such as pressure on the optical fiber.So both made identical disturbance put on two same systems, observed signal power can be not identical yet.Same system is in different time, and as by day and at night, the temperature difference makes identical disturbance also can record different strong and weak signals.Sometimes even do not observe disturbing signal.This system that will make can not reliablely and stablely work.
The problems referred to above are all unavoidable problem of all fibre systems of using principle of interferences; These factors can cause rate of failing to report and the rate of false alarm of optical fiber interference signal instability, signal to noise ratio (S/N ratio) variation, system a series of problems such as to increase.
Summary of the invention
The objective of the invention is to overcome the deficiency that above-mentioned prior art exists, and a kind of white light interference electro-optical system be provided, it has, and optical fiber interference signal is stable, signal to noise ratio (S/N ratio) be improved significantly advantage.
For achieving the above object; The technical scheme that the present invention adopts is: a kind of white light interference electro-optical system, and it comprises white light source, photodetector, fiber coupler, sensor fibre, wherein fiber coupler is the 2X2 fiber coupler; The two ends of sensor fibre respectively with two of coupling mechanism in the same way port be connected to form the optics closed-loop path; White light source and photodetector are connected respectively to the another side of fiber coupler, and the white light that white light source sends divides clockwise and counterclockwise both direction to get into the optics closed-loop path through fiber coupler; The process sensor fibre is got back to fiber coupler formation interference signal after experiencing disturbing signal, is received by photodetector.
Preferably, the splitting ratio of said fiber coupler is 1: 1, and said sensor fibre is a single-mode fiber.
The invention has the beneficial effects as follows:
The present invention has used white light source to replace the laser of the single wavelength in the conventional solution.Use white light source, come down on the optics closed-loop path, to import simultaneously the light of different wave length.And the birefringence effect in this optics closed-loop path all bring different differing can for the light of each different wave length, promptly for the light of each wavelength, and the φ in the formula (2)
0Distortion curvature, the temperature variation of optical fiber in the time of installed by optical fiber, put on the influence of the factors such as pressure on the optical fiber.Therefore; When the input white light was promptly imported different wavelength of laser simultaneously in this optics closed-loop path, because the interference in this optics closed-loop path is very low to the requirement of coherent length, we still can observe interference; And to the light of different wavelengths, the φ in the formula (1) (2)
0All inequality, thus observe a kind of average effect.This average effect makes that observed interference strength is more stable, receives the influence of environmental change littler.
Description of drawings
Fig. 1 is that illustration is implemented in the optical interference of traditional optical closed-loop path.
Fig. 2 is that the present invention is used for white light interference electro-optical system embodiment synoptic diagram.
Fig. 3 is traditional optical closed-loop path optical interference change in signal strength figure.
Fig. 4 is electro-optical system optical interference change in signal strength figure of the present invention.
The mark of each parts is following among Fig. 1 and Fig. 2:
1, white light source; 2, fiber coupler; 3, photodetector; 4, sensor fibre.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is set forth in detail, thereby protection scope of the present invention is made more explicit defining so that advantage of the present invention and characteristic can be easier to it will be appreciated by those skilled in the art that.
As shown in Figure 2, a kind of white light interference electro-optical system, it comprises white light source 1, photodetector 3, fiber coupler 2 and sensor fibre 4.Fiber coupler 2 in the present embodiment is the 2x2 fiber coupler.The two ends of sensor fibre 4 respectively with two of fiber coupler 2 in the same way port be connected, white light source 1 and photodetector 3 are connected respectively to the another side of fiber coupler 2.White light comes out the back to fiber coupler 2 from white light source 1, and the light that is come out by fiber coupler 2 returns fiber coupler 2 through sensor fibre 4, constitutes an optics closed-loop path.During work, the white light that white light source 1 sends divides clockwise and counterclockwise both direction to get into the optics closed-loop path through fiber coupler 2, and process sensor fibre 4 is got back to fiber coupler 2 formation interference signals after experiencing disturbing signal, is received by photodetector 3.
The splitting ratio of preferred fiber coupler 2 is 1: 1 in the present embodiment, and sensor fibre 4 is a single-mode fiber.
The problem of the swinging of signal that white light interference electro-optical system of the present invention is brought for the birefringent phenomenon that solves in the optical fiber, method provided by the invention is to use white light source.
Can find out that by Fig. 3 in the traditional optical closed-loop path, because the interference that birefringent phenomenon brings, the optical interference signal is suddenly big or suddenly small, the point of null value particularly occurred much approaching.
Can be found out that by Fig. 4 owing to adopted white light source, in electro-optical system of the present invention, the intensity of optical interference signal is obviously improved, a large amount of points near null value that occur disappear basically in Fig. 3.
The above is merely embodiments of the invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes instructions of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (3)
1. white light interference electro-optical system; It is characterized in that: comprise white light source, photodetector, fiber coupler and sensor fibre; Wherein fiber coupler is the 2X2 fiber coupler, the two ends of sensor fibre respectively with two of fiber coupler in the same way port be connected to form the optics closed-loop path, white light source and photodetector are connected respectively to the another side of fiber coupler; The white light that white light source sends is through fiber coupler; Divide clockwise and counterclockwise both direction to get into the optics closed-loop path, the process sensor fibre is got back to fiber coupler formation interference signal after experiencing disturbing signal, is received by photodetector.
2. white light interference electro-optical system according to claim 1 is characterized in that: the splitting ratio of said fiber coupler is 1:1.
3. white light interference electro-optical system according to claim 1 and 2 is characterized in that: said sensor fibre is a single-mode fiber.
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|---|---|---|---|
| CN2012100883034A CN102620759A (en) | 2012-03-30 | 2012-03-30 | White light interference photoelectric system |
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|---|---|---|---|
| CN2012100883034A CN102620759A (en) | 2012-03-30 | 2012-03-30 | White light interference photoelectric system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1460870A (en) * | 2003-06-12 | 2003-12-10 | 复旦大学 | All optical fibre interference method and its testing system |
| JP2007205940A (en) * | 2006-02-02 | 2007-08-16 | Hitachi Cable Ltd | Sagnac interference type sensor |
| CN101487723A (en) * | 2009-03-02 | 2009-07-22 | 北京航空航天大学 | Optical fiber distributed perturbation sensor based on Sagnac interferometer |
| CN202494460U (en) * | 2012-03-30 | 2012-10-17 | 苏州攀星光电科技有限公司 | White-light interferometric optoelectronic system |
-
2012
- 2012-03-30 CN CN2012100883034A patent/CN102620759A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1460870A (en) * | 2003-06-12 | 2003-12-10 | 复旦大学 | All optical fibre interference method and its testing system |
| JP2007205940A (en) * | 2006-02-02 | 2007-08-16 | Hitachi Cable Ltd | Sagnac interference type sensor |
| CN101487723A (en) * | 2009-03-02 | 2009-07-22 | 北京航空航天大学 | Optical fiber distributed perturbation sensor based on Sagnac interferometer |
| CN202494460U (en) * | 2012-03-30 | 2012-10-17 | 苏州攀星光电科技有限公司 | White-light interferometric optoelectronic system |
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Application publication date: 20120801 |