CN102162749A - Full optical fiber symmetric differential interferometer - Google Patents
Full optical fiber symmetric differential interferometer Download PDFInfo
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- CN102162749A CN102162749A CN2010102722517A CN201010272251A CN102162749A CN 102162749 A CN102162749 A CN 102162749A CN 2010102722517 A CN2010102722517 A CN 2010102722517A CN 201010272251 A CN201010272251 A CN 201010272251A CN 102162749 A CN102162749 A CN 102162749A
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- optical fiber
- fiber coupler
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Abstract
The invention discloses a full optical fiber symmetric differential interferometer, which belongs to the technical field of optical fibers. The structure of the full optical fiber symmetric differential interferometer is characterized in that: a light source and a light receiving module are connected with one input end and the output ends of the optical fiber coupler respectively; one input end of the optical fiber coupler is connected with one output end of the optical fiber coupler through a delay optical fiber; and the other input end of the optical fiber coupler is connected with the output ends through a sensing optical fiber. In the full optical fiber symmetric differential interferometer, only one optical fiber coupler is adopted, so phase modulation information can be extracted by one optical fiber and any reciprocity change in a full optical fiber interference system can be eliminated totally, and the system anti-interference capability is high. Under the condition of no change of the length of the optical fiber, the phase sensitivity is high; therefore, the extraction capability of weak physical signals is improved, and interferences caused by various environmental factors such as temperature, vibration, electromagnetic interferences and the like can be overcome.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, relate in particular to the full optical fiber interference technical field.
Background technology
Interference of light has been widely used in sensing testing and communication technique field, especially aspect the circumference security protection, utilize the technology of interference of light measuring vibrations, stress signal more and more perfect, usually structure more complicated in the system that utilizes full optical fiber interference method measuring vibrations signal of the prior art, the cost problem of bringing thus and the insensitive problem of system can't thoroughly solve always.
Summary of the invention
In order to solve the deficiencies in the prior art, the invention provides full optical fiber symmetric form differential interference instrument.
The object of the present invention is achieved like this: a kind of full optical fiber symmetric form differential interference instrument, form by light source, photodetection module, fiber coupler, delay optical fiber and sensor fibre.Its architectural feature is as follows: light source links to each other with output terminal with an input end of fiber coupler respectively with Optical Receivers, an input end of fiber coupler links to each other by an output terminal that postpones optical fiber and fiber coupler, and another input end of fiber coupler links to each other with output terminal by sensor fibre.
In the described structure of native system, the light that light source sends enters behind the fiber coupler by beam split, and fiber coupler enters output terminal with the input optical signal beam split; Two-way coherent light path is:
(1) optical source-optical fiber coupler-time delay optical fiber-sensor fibre-photodetection module
(2) optical source-optical fiber coupler-sensor fibre-time delay optical fiber-photodetection module
Because the effect of external force forms when differing, the two-beam that carries phase information interferes at the input end that links to each other with Optical Receivers that turns back to fiber coupler when sensor fibre.
Result of interference enters Optical Receivers by fiber coupler and changes electrical information into, electric current transmitted value in the output lead.As can be seen, fiber optic interferometric system light path structure has good reciprocity among the present invention, and result of interference has only been carried the phase information that external force produces.
The present invention can adopt 3 * 3 fiber couplers, 4 * 4 fiber couplers etc., the luminous power of the fiber coupler that adopts is divided equally, the luminous power splitting ratio that is them is 1: I: 1 or 1: I: 1: 1, etc., the input end of the fiber coupler of employing and output terminal have interchangeability respectively.
Described light source, photodetection module, fiber coupler, delay optical fiber, sensor fibre adopt optical fiber to connect.
Beneficial effect of the present invention is: the present invention has designed a kind of full optical fiber symmetric form differential interference instrument, and its outstanding advantage is only to adopt a fiber coupler, can realize that the simple optical fiber of phase-modulated information extracts.Can eliminate the variation of any reciprocity in the all-fiber interferometer fully, system's antijamming capability is strong.Under the situation that does not change fiber lengths, the phse sensitivity height, not only improved the extractability of weak physical signalling, and overcome the interference of various environmental factors such as temperature, vibration, electromagnetic interference (EMI), need not introduce power supply in the higher-pressure region, so system's antijamming capability is stronger, can be used for complexity, rugged environment.
Description of drawings
Fig. 1 is a full optical fiber symmetric form differential interference instrument structural representation of the present invention.
1, light source
2, photodetection module
3, fiber coupler
4, postpone optical fiber
5, sensor fibre
Embodiment
The invention discloses a kind of full optical fiber symmetric form differential interference instrument, the present invention be described in detail below in conjunction with the drawings and specific embodiments:
A kind of full optical fiber symmetric form differential interference instrument, wherein, light source (2) links to each other with output terminal with an input end of fiber coupler (1) respectively with Optical Receivers (3), an input end of fiber coupler (1) links to each other by an output terminal that postpones optical fiber (4) and fiber coupler (1), and another input end of fiber coupler (1) links to each other with output terminal by sensor fibre (5).
Two-way coherent light of the present invention path is:
(1) light source 2-fiber coupler 2-time delay optical fiber 4-sensor fibre 5-photodetection module 3
(2) light source 2-fiber coupler 1-sensor fibre 5-time delay optical fiber 4-photodetection module 3
Because the effect of external force forms when differing, the two-beam that carries phase information interferes when turning back to photodetection module 2 when sensor fibre.
Light source 1 can be any in following: operation wavelength is the semiconductor laser diode (LD) of 1310nm or 1550nm, semiconductor light-emitting-diode (LED) laser instrument, super-radiance light emitting diode (SLD) laser instrument and ASE light source etc., present embodiment selection work wavelength is semiconductor light-emitting-diode (LED) light source of 1550nm
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change are possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or essential characteristic, and the present invention can be with other forms, structure, layout, ratio, and realize with other elements, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change here to disclosed embodiment.
Claims (3)
1. full optical fiber symmetric form differential interference instrument, it is characterized in that: light source (2) links to each other with output terminal with an input end of fiber coupler (1) respectively with Optical Receivers (3), an input end of fiber coupler (1) links to each other by an output terminal that postpones optical fiber (4) and fiber coupler (1), and another input end of fiber coupler (1) links to each other with output terminal by sensor fibre (5).
2. full optical fiber symmetric form differential interference instrument according to claim 1, it is characterized in that: the luminous power of described fiber coupler (1) is divided equally, and can exchange between several input ends and the output terminal.
3. closed-loop type all-fiber interferometer according to claim 1 is characterized in that: adopt optical fiber to connect between described light source (2), photodetection module (3), fiber coupler (1), delay optical fiber (4) and the sensor fibre (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102722517A CN102162749A (en) | 2010-09-02 | 2010-09-02 | Full optical fiber symmetric differential interferometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102722517A CN102162749A (en) | 2010-09-02 | 2010-09-02 | Full optical fiber symmetric differential interferometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102162749A true CN102162749A (en) | 2011-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102722517A Pending CN102162749A (en) | 2010-09-02 | 2010-09-02 | Full optical fiber symmetric differential interferometer |
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| CN (1) | CN102162749A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105841795A (en) * | 2016-05-25 | 2016-08-10 | 沈阳安搜科技有限公司 | Novel optical fiber detection fence based on Sagnac interference technology |
| CN104215319B (en) * | 2014-09-01 | 2017-01-11 | 安徽大学 | Dynamic range adjustable differential interferometer and measuring method |
-
2010
- 2010-09-02 CN CN2010102722517A patent/CN102162749A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215319B (en) * | 2014-09-01 | 2017-01-11 | 安徽大学 | Dynamic range adjustable differential interferometer and measuring method |
| CN105841795A (en) * | 2016-05-25 | 2016-08-10 | 沈阳安搜科技有限公司 | Novel optical fiber detection fence based on Sagnac interference technology |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110824 |