CN101871789A - System and method for realizing optical fiber interferometer sensor multiplexing - Google Patents
System and method for realizing optical fiber interferometer sensor multiplexing Download PDFInfo
- Publication number
- CN101871789A CN101871789A CN 201010194629 CN201010194629A CN101871789A CN 101871789 A CN101871789 A CN 101871789A CN 201010194629 CN201010194629 CN 201010194629 CN 201010194629 A CN201010194629 A CN 201010194629A CN 101871789 A CN101871789 A CN 101871789A
- Authority
- CN
- China
- Prior art keywords
- reflecting surface
- coupling mechanisms
- photodetector
- interferometer
- series
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Instruments For Measurement Of Length By Optical Means (AREA)
Abstract
The invention discloses a system for realizing optical fiber interferometer sensor multiplexing. The system sequentially comprises a laser light source 1, a 2*1 coupler 2 or circulator, a first photoelectric detector 4, a second photoelectric detector 5, a third photoelectric detector 6 and a 3*3 coupler 3, wherein the laser light source 1 and the second photoelectric detector 5 are connected the 2*1 coupler 2 or circulator respectively; and the 2*1 coupler 2 or circulator is connected with the 3*3 coupler 3 and a series of series-wound Michelson interferometers. The system has the advantages of overcoming the disadvantage that the conventional 3*3 coupler can only demodulate the optical path difference of a single interferometer, greatly improving the multiplexing capacity of the interferometer, and forming a multi-interferometer sensor system.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, be specifically related to a kind of optical time domain reflection technology and 3 * 3 coupling mechanism demodulation methods are combined and realize the method and the sensing system of optical fiber interferometer sensor multiplexing.
Background technology
Interferometric optical fiber sensor has been widely used in the measurement of physical quantitys such as the underwater sound, strain, magnetic field, electric current and acceleration because of its high sensitivity at present.Wherein as the sensing system of fibre optic interferometer, demodulation is a key problem.At present, the demodulation method of fibre optic interferometer has phase carrier method, white light interference method, symmetry 3 * 3 coupling mechanism demodulation methods etc., and these methods respectively have characteristics.The white light interference method can demodulate the absolute light path difference of sensor, and phase carrier method and symmetry 3 * 3 coupling mechanism demodulation methods can not, can only follow the tracks of phase change, but most of occasion only need be followed the tracks of phase place and got final product.
In the demodulation method of following the tracks of phase place, the advantage of symmetry 3 * 3 coupling mechanism demodulation methods is that light source need not modulation, do not need optical path difference between each light path of interferometer, interferometer two arms can be equal fully, and circuit can be operated in does not influence demodulation result under the different luminous powers.And for its three tunnel outputs, we can adopt symmetrical demodulation method to demodulate phase differential.But traditional symmetry 3 * 3 coupling mechanism demodulation methods can only carry out demodulation to an interference sensor, are difficult to realize many interferometer sensors system.
Summary of the invention
Problem to be solved by this invention is: how a kind of system and method for realizing many optical fiber interferometer sensor multiplexings is provided, and this system can be with the phase place of cover mediation system demodulation a plurality of fibre optic interferometers.
Technical matters proposed by the invention is to solve like this: a kind of system that realizes many optical fiber interferometer sensor multiplexings is provided, it is characterized in that, comprise LASER Light Source 1 successively, 2 * 1 coupling mechanisms or circulator 2, first photodetector 4, second photodetector 5, the 3rd photodetector 6 and 3 * 3 coupling mechanisms 3, described LASER Light Source 1 is connected 2 * 1 coupling mechanisms or circulator 2 respectively with second photodetector 5,2 * 1 coupling mechanisms or circulator 2 connect 3 * 3 coupling mechanisms 3, first photodetector 4 and the 3rd photodetector 5 are connected the incident end of 3 * 3 coupling mechanisms 3, the wherein two-way of the exit end of 3 * 3 coupling mechanisms 3 is the concatenated fiber reflecting surface respectively, and wherein one road fiber reflection face is by reflecting surface T
1, reflecting surface T
2... reflecting surface T
nForm another route reflection face T '
1, reflecting surface T '
2... reflecting surface T '
nForm reflecting surface T
1And T '
1, T
2And T '
2... ... ..T
nAnd T '
nCombination pairing in twos constitutes a series of serial connection Michelson interferometer (Michelson interferometer) successively, and the optical path difference of the interferometer that constitutes between the reflecting surface is far smaller than the distance of reflecting surface to 3 * 3 coupling mechanisms 3.
A kind of method that realizes many optical fiber interferometer sensor multiplexings may further comprise the steps:
1. the laser of LASER Light Source 1 generation produces laser pulse through ovennodulation, incides 3 * 3 coupling mechanisms 3 through 2 * 1 coupling mechanisms 2 or circulator;
The wherein two-way of the exit end of 2. described 3 * 3 coupling mechanisms 3 is connected in series a series of reflectings surface, and wherein one road fiber reflection face is by reflecting surface T
1, reflecting surface T
2... reflecting surface T
nForm another route reflection face T '
1, reflecting surface T '
2... reflecting surface T '
nForm reflecting surface T
1And T '
1, T
2And T '
2... T
nAnd T '
nCombination pairing in twos constitutes a series of serial connection Michelson interferometer successively, and the optical path difference of the interferometer that constitutes between the reflecting surface is far smaller than the distance of reflecting surface to 3 * 3 coupling mechanisms 3;
3. will incide the incident end that the laser pulse signal that is connected in series Michelson interferometer reflects back into described 3 * 3 coupling mechanisms 3 through 3 * 3 coupling mechanisms 3;
4. first photodetector 4, second photodetector 5, the 3rd photodetector 6 that are connected 3 * 3 coupling mechanisms, 3 incident ends or 2 * 1 coupling mechanisms 2 or circulator incident end are surveyed the time domain light signal of the laser pulse that 3. reflects through step;
5. according to step time domain light signal 4., obtain being connected in series the laser pulse signal that Michelson interferometer reflects respectively, have the phase differential of 120 degree, thereby demodulate the independent phase of each interferometer respectively according to 3 * 3 coupling mechanisms, 3 road light signals.
Beneficial effect of the present invention: changed the inferior position of the optical path difference that original 3 * 3 coupling mechanisms can only demodulation single interference instrument, promoted the multiplexing capacity of interferometer greatly, formed a kind of many interferometer sensors system.
Description of drawings
Fig. 1 is the logic diagram of the system of the many optical fiber interferometer sensor multiplexings of realization of the present invention.
Wherein, 1, LASER Light Source, 2,2 * 1 coupling mechanism or circulators, 3,3 * 3 coupling mechanisms, 4, first photodetector, 5, second photodetector, the 6, the 3rd photodetector.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described:
The technical solution adopted in the present invention is: a laser produces light pulse through ovennodulation, incide one 3 * 3 coupling mechanisms 3 through coupling mechanism or circulator, the wherein two-way of the exit end of 3 * 3 coupling mechanisms 3 is connected in series a series of reflecting surface, the reflecting surface of this two-way successively with the distance of 3 * 3 coupling mechanisms (range difference is far smaller than the distance of reflecting surface to 3 * 3 coupling mechanisms) about equally, thereby the reflecting surface of two-way optical fiber constitutes a series of serial connection Michelson interferometer like this, these interferometers return to turn back to the incident end of 3 * 3 coupling mechanisms with the signal reflex of pulse laser, the incident termination has three photodetectors to survey the time domain light signal of the reflection of these interferometers, just can obtain the signal that these serial connection interferometers reflect respectively according to time-domain signal, there is the phase differential of 120 degree according to 3 * 3 coupling mechanisms, 3 road light signals, thereby can demodulates the independent phase of each interferometer respectively.
Particularly: a kind of system that realizes many optical fiber interferometer sensor multiplexings, comprise LASER Light Source 1 successively, 2 * 1 coupling mechanisms or circulator 2, first photodetector 4, second photodetector 5, the 3rd photodetector 6 and 3 * 3 coupling mechanisms 3, described LASER Light Source 1 is connected 2 * 1 coupling mechanisms or circulator 2 respectively with second photodetector 5,2 * 1 coupling mechanisms or circulator 2 connect 3 * 3 coupling mechanisms 3, first photodetector 4 and the 3rd photodetector 5 are connected the incident end of 3 * 3 coupling mechanisms 3, the wherein two-way of the exit end of 3 * 3 coupling mechanisms 3 is the concatenated fiber reflecting surface respectively, and wherein one road fiber reflection face is by reflecting surface T
1, reflecting surface T
2... reflecting surface T
nForm another route reflection face T '
1, reflecting surface T '
2... reflecting surface T '
nForm reflecting surface T
1And T '
1, T
2And T '
2... ... ..T
nAnd T '
nCombination pairing in twos constitutes a series of serial connection Michelson interferometer (Michelson interferometer) successively, and the optical path difference of the interferometer that constitutes between the reflecting surface is far smaller than the distance of reflecting surface to 3 * 3 coupling mechanisms 3.
A kind of method that realizes many optical fiber interferometer sensor multiplexings may further comprise the steps:
1. the laser of LASER Light Source 1 generation produces laser pulse through ovennodulation, incides 3 * 3 coupling mechanisms 3 through 2 * 1 coupling mechanisms 2 or circulator;
The wherein two-way of the exit end of 2. described 3 * 3 coupling mechanisms 3 is connected in series a series of reflectings surface, and wherein one road fiber reflection face is by reflecting surface T
1, reflecting surface T
2... reflecting surface T
nForm another route reflection face T '
1, reflecting surface T '
2... reflecting surface T '
nForm reflecting surface T
1And T '
1, T
2And T '
2... T
nAnd T '
nCombination pairing in twos constitutes a series of serial connection Michelson interferometer successively, and the optical path difference of the interferometer that constitutes between the reflecting surface is far smaller than the distance of reflecting surface to 3 * 3 coupling mechanisms 3;
3. will incide the incident end that the laser pulse signal that is connected in series Michelson interferometer reflects back into described 3 * 3 coupling mechanisms 3 through 3 * 3 coupling mechanisms 3;
4. first photodetector 4, second photodetector 5, the 3rd photodetector 6 that are connected 3 * 3 coupling mechanisms, 3 incident ends or 2 * 1 coupling mechanisms 2 or circulator incident end are surveyed the time domain light signal of the laser pulse that 3. reflects through step;
5. according to step time domain light signal 4., obtain being connected in series the laser pulse signal that Michelson interferometer reflects respectively, have the phase differential of 120 degree, thereby demodulate the independent phase of each interferometer respectively according to 3 * 3 coupling mechanisms, 3 road light signals.
Embodiment
As shown in Figure 1, the 1550nm wavelength laser light source 1 of a 10mW power produces pulsed light through ovennodulation, and pulse width 10ns～10 μ s are adjustable, the repetition frequency 5KHz of pulse.
One 2 * 1 (1: 1) coupling mechanism 2 and one 3 * 3 (1: 1: 1) coupling mechanism 3 are arranged, operation wavelength 1550nm in the system.Reflecting surface T
1And T '
1, T
2And T '
2... ... ..T
nAnd T '
nCombination pairing in twos constitutes a series of serial connection Michelson interferometer successively.The distance of these reflectings surface to 3 * 3 coupling mechanisms is much larger than the optical path difference of the interferometer of two faces formations, and the distance of reflecting surface is about 100 meters here.
Pulse is through T
1And T '
1, T
2And T '
2... ... ..T
nAnd T '
nThe light that two mirror reflects are returned can form interference.With T
1And T '
1Be example, first photodetector 4, second photodetector 5, the 3rd photodetector 6 can detect three interference output P through 3 * 3 coupling mechanisms
1(T
1), P
2(T
1) and P
3(T
1), three road interferometer signal phase differential differ 120 degree, can constitute three independent equations,
P
T2＝C+Bcos(φ)
Can demodulate phase
1(t).And the like, can obtain T
2And T '
2, T
3And T '
3... pairing φ
2(t), φ
3(t) ....To design the repetition frequency of laser pulse and the distance between the catoptron before building system, guarantee can not overlap when each road interference signal is exported.
Claims (2)
1. system that realizes many optical fiber interferometer sensor multiplexings, it is characterized in that, comprise LASER Light Source (1) successively, 2 * 1 coupling mechanisms or circulator (2), first photodetector (4), second photodetector (5, the 3rd photodetector (6) and 3 * 3 coupling mechanisms (3), described LASER Light Source (1) is connected 2 * 1 coupling mechanisms (2) or circulator respectively with second photodetector (5), 2 * 1 coupling mechanisms or circulator (2) connect 3 * 3 coupling mechanisms (3), first photodetector (4) and the 3rd photodetector (5) are connected the incident end of 3 * 3 coupling mechanisms (3), the wherein two-way of the exit end of 3 * 3 coupling mechanisms (3) is the concatenated fiber reflecting surface respectively, and wherein one road fiber reflection face is by reflecting surface T
1, reflecting surface T
2... reflecting surface T
nForm another route reflection face T '
1, reflecting surface T '
2... reflecting surface T '
nForm reflecting surface T
1And T '
1, T
2And T '
2... ... ..T
nAnd T '
nCombination pairing in twos constitutes a series of serial connection Michelson interferometer successively, and the optical path difference of the interferometer that constitutes between the reflecting surface is far smaller than the distance of reflecting surface to 3 * 3 coupling mechanisms (3).
2. method that realizes many optical fiber interferometer sensor multiplexings may further comprise the steps:
1. the laser of LASER Light Source (1) generation produces laser pulse through ovennodulation, incides 3 * 3 coupling mechanisms (3) through 2 * 1 coupling mechanisms or circulator (2);
The wherein two-way of the exit end of 2. described 3 * 3 coupling mechanisms (3) is connected in series a series of reflectings surface, and wherein one road fiber reflection face is by reflecting surface T
1, reflecting surface T
2... reflecting surface T
nForm another route reflection face T '
1, reflecting surface T '
2... reflecting surface T '
nForm reflecting surface T
1And T '
1, T
2And T '
2... T
nAnd T '
nCombination pairing in twos constitutes a series of serial connection Michelson interferometer successively, and the optical path difference of the interferometer that constitutes between the reflecting surface is far smaller than the distance of reflecting surface to 3 * 3 coupling mechanisms (3);
3. will incide the incident end that the laser pulse signal that is connected in series Michelson interferometer reflects back into described 3 * 3 coupling mechanisms (3) through 3 * 3 coupling mechanisms (3);
4. first photodetector (4), second photodetector (5), the 3rd photodetector (6) that are connected 3 * 3 coupling mechanisms (3) incident end or 2 * 1 coupling mechanisms or circulator (2) incident end are surveyed the time domain light signal of the laser pulse that 3. reflects through step;
5. according to step time domain light signal 4., obtain being connected in series the laser pulse signal that Michelson interferometer reflects respectively, have the phase differential of 120 degree, thereby demodulate the independent phase of each interferometer respectively according to 3 * 3 coupling mechanisms (3) road light signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010194629 CN101871789A (en) | 2010-06-08 | 2010-06-08 | System and method for realizing optical fiber interferometer sensor multiplexing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010194629 CN101871789A (en) | 2010-06-08 | 2010-06-08 | System and method for realizing optical fiber interferometer sensor multiplexing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101871789A true CN101871789A (en) | 2010-10-27 |
Family
ID=42996789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010194629 Pending CN101871789A (en) | 2010-06-08 | 2010-06-08 | System and method for realizing optical fiber interferometer sensor multiplexing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101871789A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104736974A (en) * | 2012-07-04 | 2015-06-24 | 斯汀格雷地球物理有限公司 | Optical monitoring system |
| CN110940364A (en) * | 2019-11-26 | 2020-03-31 | 复旦大学 | Distributed two-arm sensing system based on Michelson interferometer |
| CN112763050A (en) * | 2020-12-25 | 2021-05-07 | 复旦大学 | Optical fiber Michelson voice monitoring system and stable noise sound extraction method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1752836A (en) * | 2005-09-27 | 2006-03-29 | 北京理工大学 | Demodulation method of optical fiber interference signal |
| CN101183014A (en) * | 2007-12-13 | 2008-05-21 | 北京理工大学 | Full polarization-preserving fiber interferometer based on 3X3 polarization-preserving fiber coupling mechanism |
| CN201688855U (en) * | 2010-06-08 | 2010-12-29 | 电子科技大学 | System for realizing optical fiber interferometer sensor multiplexing |
-
2010
- 2010-06-08 CN CN 201010194629 patent/CN101871789A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1752836A (en) * | 2005-09-27 | 2006-03-29 | 北京理工大学 | Demodulation method of optical fiber interference signal |
| CN101183014A (en) * | 2007-12-13 | 2008-05-21 | 北京理工大学 | Full polarization-preserving fiber interferometer based on 3X3 polarization-preserving fiber coupling mechanism |
| CN201688855U (en) * | 2010-06-08 | 2010-12-29 | 电子科技大学 | System for realizing optical fiber interferometer sensor multiplexing |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104736974A (en) * | 2012-07-04 | 2015-06-24 | 斯汀格雷地球物理有限公司 | Optical monitoring system |
| CN104736974B (en) * | 2012-07-04 | 2017-08-08 | 斯汀格雷地球物理有限公司 | Optical monitoring system |
| CN110940364A (en) * | 2019-11-26 | 2020-03-31 | 复旦大学 | Distributed two-arm sensing system based on Michelson interferometer |
| CN112763050A (en) * | 2020-12-25 | 2021-05-07 | 复旦大学 | Optical fiber Michelson voice monitoring system and stable noise sound extraction method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wang et al. | Distributed OTDR-interferometric sensing network with identical ultra-weak fiber Bragg gratings | |
| CN100561144C (en) | Distributed optical fiber vibration sensing method and device | |
| WO2017087792A1 (en) | Method and apparatus for distributed sensing | |
| CN102901525B (en) | Ultra-large capacity time division and wavelength division fiber grating sensing system and query method thereof | |
| CN102721459B (en) | Optical fiber hydrophone array adopting reflective quasi-reciprocity optical path | |
| CN101634571B (en) | Optical pulse raster distributed fiber sensing device | |
| CN105973450B (en) | Optical fiber Fizeau interference arrays distributed vibration sensing system and method | |
| CN105784101A (en) | Fizeau interference distributed vibration sensing system and Fizeau interference distributed vibration sensing method based on optical fiber weak reflection lattice | |
| CN101298992A (en) | Distributed type fiber optic sensor based on optical fiber cavity attenuation and vibration technique | |
| CN103076575A (en) | Magnetic field sensor based on magnetic fluid poured polarization-maintaining photonic crystal fiber | |
| CN106404154B (en) | Optical fiber sound wave detection system | |
| CN107036734A (en) | A kind of fully distributed fiber temperature or the method for sensing and sensor of strain | |
| CN101813238B (en) | Sagnac/Mach-Zehnder interferometer profile fiber sensing system and time domain positioning method thereof | |
| CN101561536B (en) | Optical fiber sensing wavelength demodulating system for resisting oscillation and noise disturbance | |
| CN106066203A (en) | Distributed highly sensitive vibration-detection system based on ultrashort optical fiber optical grating array and method | |
| CN101551266A (en) | Compound interference type distributed optical fiber vibration sensing system and sensing method thereof | |
| CN111308125B (en) | Acceleration detection method based on optical fiber Sagnac interferometer and acceleration meter | |
| CN101750590B (en) | Method and device for measuring environment temperature change and magnetic induction strength | |
| CN101871789A (en) | System and method for realizing optical fiber interferometer sensor multiplexing | |
| CN202974421U (en) | Composite chamber fiber grating laser hydrophone | |
| CN102721458A (en) | Optical fiber hydrophone adopting reflective quasi-reciprocity optical path | |
| CN201688855U (en) | System for realizing optical fiber interferometer sensor multiplexing | |
| CN207007371U (en) | A kind of fully distributed fiber temperature or the sensor of strain | |
| CN206709787U (en) | A kind of double chirp gratings strain demodulating system based on piezoelectric ceramics | |
| CN104180830A (en) | Distributed optical fiber fizeau interferometer based on light time domain reflection principle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20101027 |