CN102607623A - Multisource interference optoelectronic system - Google Patents
Multisource interference optoelectronic system Download PDFInfo
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- CN102607623A CN102607623A CN2012100889295A CN201210088929A CN102607623A CN 102607623 A CN102607623 A CN 102607623A CN 2012100889295 A CN2012100889295 A CN 2012100889295A CN 201210088929 A CN201210088929 A CN 201210088929A CN 102607623 A CN102607623 A CN 102607623A
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Abstract
The invention relates to a multisource interference optoelectronic system. The scheme provided by the invention is characterized in that the multisource interference optoelectronic system comprises at least two laser sources with different wavelengths, a photoelectric detector, a preceding stage optical fiber coupler, a backward stage optical fiber coupler and a sensing optical fiber, wherein the number of ports at one side of the preceding stage optical fiber coupler at least is not less than the number of the laser sources, and the backward stage optical fiber coupler is a 2X2 optical fiber coupler; two ends of the sensing optical fiber are respectively connected with two ports in the same direction of the backward stage optical fiber coupler to form an optical closed loop; all the laser sources are connected at the same side of the preceding stage optical fiber coupler; and one port at the other side of the preceding stage optical fiber coupler and the photoelectric detector are connected at the other side of the backward stage optical fiber coupler. By adoption of the multisource interference optoelectronic system, the problems that an interference signal is not enough in strength and is not stable caused by a double refraction phenomenon generated in the optical fiber randomly in the traditional optical fiber interference system are solved, in this way, the optoelectronic system has the advantages that the interference signal is stable and is not affected 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 to the 2x2 coupling mechanism after the 1x2 coupling mechanism converges, and converges to detector again through disturbing signal induction optical fiber and 2x2 coupling mechanism and forms interference signal.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)
ΔΦ in the following formula (t)=Φ (t-t
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 ΔΦ 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 Photodetection system of measuring optical fiber interference signal 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 multiple light courcess interference light electric system; Comprise at least two different wavelength of laser light sources, photodetector, prime fiber coupler, back level fiber coupler and sensor fibre; Wherein the prime fiber coupler has at least port number on one side to be no less than the quantity of LASER Light Source, and back level fiber coupler is the 2X2 fiber coupler; The two ends of sensor fibre respectively with two of back level fiber coupler in the same way port be connected to form the optics closed-loop path; Each LASER Light Source is connected respectively to same one side of prime fiber coupler, and port of prime fiber coupler another side and photodetector are connected respectively to the another side of back level fiber coupler; The light that each LASER Light Source sends is the level fiber coupler after the prime fiber coupler converges to; Divide clockwise and counterclockwise both direction to get into the optics closed-loop path again; The process sensor fibre is got back to back level fiber coupler formation interference signal after experiencing disturbing signal, is received by photodetector.
Preferably, said prime fiber coupler is the 1X2 fiber coupler, and the quantity of said different wavelength of laser light source is 2.
Preferably, said back level fiber coupler splitting ratio 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 multiple different wavelength of laser to replace the laser of the single wavelength in the conventional solution, and it comes 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 in this optics closed-loop path, importing different wavelength of laser simultaneously, 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 effect of complementation.This complementary 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 multiple light courcess interference light electric 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, first LASER Light Source; 2, back level fiber coupler; 3, photodetector; 4, sensor fibre; 5, prime fiber coupler; 6, second LASER Light Source.
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 multiple light courcess interference light electric system; It comprises two different wavelength of laser light sources i.e. first LASER Light Source 1 and second LASER Light Source 6, photodetector 3, prime fiber coupler 5, back grade fiber coupler 2 and sensor fibre 4; Wherein prime fiber coupler 5 is the 1X2 fiber coupler, and back level fiber coupler 2 is the 2X2 fiber coupler; The two ends of sensor fibre 4 respectively with two of back level fiber coupler 2 in the same way port be connected; First LASER Light Source 1 is connected with same one side of prime fiber coupler 5 respectively with second LASER Light Source 6, and the another port of prime fiber coupler 5 and photodetector 3 are connected respectively to the another side of back level fiber coupler 2.The different wavelength of laser that first LASER Light Source 1 and second LASER Light Source 6 send respectively is level fiber coupler 2 after prime fiber coupler 5 converges to; Light level fiber coupler 2 after sensor fibre 4 returns by back level fiber coupler 2 comes out constitutes an optics closed-loop path.During work; The different wavelength of laser that first LASER Light Source 1 and second LASER Light Source 6 send respectively is level fiber coupler 2 after prime fiber coupler 5 converges to; Divide clockwise and counterclockwise both direction to get into the optics closed-loop path again; Process sensor fibre 4 is got back to back level fiber coupler 2 formation interference signals after experiencing disturbing signal, is received by photodetector 3.
The splitting ratio of preferred back level fiber coupler 2 is 1: 1 in the present embodiment, and sensor fibre 4 is a single-mode fiber.Use two different wavelength of laser light sources in this embodiment, also available more a plurality of different wave length LASER Light Sources, should adopt the prime fiber coupler with the port that is no less than LASER Light Source quantity to be complementary with the quantity with LASER Light Source this moment.
The problem of the swinging of signal that multiple light courcess interference light electric system of the present invention brings for the birefringent phenomenon that solves in the optical fiber, method provided by the invention has been to use multiple different wavelength of laser.
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 multiple different wavelength of laser, 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 (4)
1. multiple light courcess interference light electric system; It is characterized in that: comprise at least two different wavelength of laser light sources, photodetector, prime fiber coupler, back level fiber coupler and sensor fibre; Wherein the prime fiber coupler has at least port number on one side to be no less than the quantity of LASER Light Source, and back level fiber coupler is the 2X2 fiber coupler; The two ends of sensor fibre respectively with two of back level fiber coupler in the same way port be connected to form the optics closed-loop path; Each LASER Light Source is connected respectively to same one side of prime fiber coupler, and port of prime fiber coupler another side and photodetector are connected respectively to the another side of back level fiber coupler; The light that each LASER Light Source sends is the level fiber coupler after the prime fiber coupler converges to; Divide clockwise and counterclockwise both direction to get into the optics closed-loop path again; The process sensor fibre is got back to back level fiber coupler formation interference signal after experiencing disturbing signal, is received by photodetector.
2. multiple light courcess interference light electric system according to claim 1 is characterized in that: said prime fiber coupler is the 1X2 fiber coupler, and the quantity of said different wavelength of laser light source is 2.
3. multiple light courcess interference light electric system according to claim 1 and 2 is characterized in that: said back level fiber coupler splitting ratio is 1:1.
4. multiple light courcess interference light electric system according to claim 1 and 2 is characterized in that: said sensor fibre is a single-mode fiber.
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|---|---|---|---|
| CN2012100889295A CN102607623A (en) | 2012-03-30 | 2012-03-30 | Multisource interference optoelectronic system |
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|---|---|---|---|
| CN2012100889295A CN102607623A (en) | 2012-03-30 | 2012-03-30 | Multisource interference optoelectronic system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007205940A (en) * | 2006-02-02 | 2007-08-16 | Hitachi Cable Ltd | Sagnac interference type sensor |
| US7679753B2 (en) * | 2007-06-26 | 2010-03-16 | Huang Hung-Chia | Passively biased fiber-optic gyroscope and current sensor |
| CN101886925A (en) * | 2010-05-27 | 2010-11-17 | 北京大学 | Multi-wavelength interference type optical fiber gyro based on carrier modulation |
| CN102157044A (en) * | 2011-04-07 | 2011-08-17 | 杨峰 | Full-optical fiber system for locating and alarming |
| CN202494462U (en) * | 2012-03-30 | 2012-10-17 | 苏州攀星光电科技有限公司 | Multiple-light source interferometric optoelectronic system |
-
2012
- 2012-03-30 CN CN2012100889295A patent/CN102607623A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007205940A (en) * | 2006-02-02 | 2007-08-16 | Hitachi Cable Ltd | Sagnac interference type sensor |
| US7679753B2 (en) * | 2007-06-26 | 2010-03-16 | Huang Hung-Chia | Passively biased fiber-optic gyroscope and current sensor |
| CN101886925A (en) * | 2010-05-27 | 2010-11-17 | 北京大学 | Multi-wavelength interference type optical fiber gyro based on carrier modulation |
| CN102157044A (en) * | 2011-04-07 | 2011-08-17 | 杨峰 | Full-optical fiber system for locating and alarming |
| CN202494462U (en) * | 2012-03-30 | 2012-10-17 | 苏州攀星光电科技有限公司 | Multiple-light source interferometric optoelectronic system |
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Application publication date: 20120725 |