CN202230020U - Refractive index sensor based on HiBi-PM-FLM (High Birefringent Polarization Maintaining Fiber Loop Mirror) - Google Patents
Refractive index sensor based on HiBi-PM-FLM (High Birefringent Polarization Maintaining Fiber Loop Mirror) Download PDFInfo
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- CN202230020U CN202230020U CN2011202711550U CN201120271155U CN202230020U CN 202230020 U CN202230020 U CN 202230020U CN 2011202711550 U CN2011202711550 U CN 2011202711550U CN 201120271155 U CN201120271155 U CN 201120271155U CN 202230020 U CN202230020 U CN 202230020U
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Abstract
The utility model provides a refractive index sensor based on a HiBi-PM-FLM (High Birefringent Polarization Maintaining Fiber Loop Mirror), which is characterized in that: the refractive index sensor consists of an incidence optical fiber (1), a 2*2 3-dB coupler (2), a polarization controller (3), a high birefringent polarization maintaining optical fiber (4), an emergence optical fiber (5), connecting optical fibers (6) and a liquid groove (7), wherein two ports at one side of the 3-dB coupler (2) are respectively connected with the incidence optical fiber (1) and the emergence optical fiber (5), the other two ports of the 3-dB coupler (2) are respectively connected with two sections of the connecting optical fibers (6), and the middle of the two sections of the connecting optical fibers (6) is respectively connected with a section of the high birefringent polarization maintaining optical fiber (4), wherein one section of the connecting optical fibers (6) is connected with the polarization controller (3); and the 3-dB coupler (2), the two sections of the connecting optical fibers (6) and the high birefringent polarization maintaining optical fiber (4) form an optical fiber environment. The refractive index sensor is high in sensitivity, is strong for resisting the outer electromagnetic interference and can be suitable for variable actual projects.
Description
Technical field
The utility model provides that a kind of (High Birefringent Polarization Maintaining Fiber Loop Mirror, index sensor HiBi-PM-FLM) belongs to technical field of optical fiber sensing based on high birefringence polarization-maintaining fiber ring mirror.
Background technology
Fiber loop mirror (FLM) is widely used in optical fiber communication and the sensor-based system.Two light waves that in the fiber turns by same optical fiber coiled, advance in opposite direction produce different phase shifts under the extraneous factor effect.Sensing, i.e. optical fibre gyro are rotated in its most typical application exactly.Because it does not have movable device, the degating region of laser gyro when not having the nonlinear effect and the slow-speed of revolution, thereby be hopeful very much to process the high-performance and low-cost device.Detecting through interference effect, is exactly the ultimate principle of sagnac interferometer.Fibre Optical Sensor based on the sagnac interferometer has its remarkable advantages in length distance, little leakage pipe detection on locating, and also can be applicable in the fiber fence warning system simultaneously, has simply efficiently, installs advantages such as convenient, that maintenance is simple, cost is lower.
In traditional FLM, insert one section high birefringence (HiBi; Highly birefringent) polarization maintaining optical fibre constitutes HiBi-PM-FLM; With hydrofluorite covering is corroded fully, then it is immersed in the index liquid to be measured, extraneous variations in refractive index has changed the HiBi-FLM optical path difference; Through interference effect, monitoring reflectance spectrum wavelength shift can be realized the refractive index sensing measurement.
Summary of the invention
The purpose of the utility model is to provide a kind of index sensor based on HiBi-PM-FLM.This device can be converted into testing liquid change of refractive amount the wavelength shift of detectable signal.Have characteristics such as simple in structure, easy operating, sensitivity height.
The utility model is realized through following technical scheme:
A kind of index sensor based on HiBi-PM-FLM is made up of incident optical (1), 3-dB coupling mechanism (2), Polarization Controller (3), high-birefringence polarisation-maintaining optical fiber (4), outgoing optical fiber (5), connection optical fiber (6) and liquid tank (7); 3-dB coupling mechanism (2) two ports on one side respectively with incident optical (1) and being connected of outgoing optical fiber (5); Other two ports of 3-dB coupling mechanism (2) are connected optical fiber (6) respectively and link to each other with two sections; Two connect optical fiber (6) one section high-birefringence polarisation-maintaining optical fiber of indirect (4), wherein connect a Polarization Controller (3) on one section connection optical fiber (6); 3-dB coupling mechanism (2), two sections connect optical fiber (6) and high-birefringence polarisation-maintaining optical fiber (4) formation fiber loop mirror.
Described a kind of index sensor based on HiBi-PM-FLM; It is characterized in that: incident optical (1), outgoing optical fiber (5) and be connected that G.652 optical fiber (6) can adopt, single-mode fiber G.653 or G.655; Incident optical (1) and outgoing optical fiber (2) length are 20～40cm, and connecting optical fiber (6) length is 10～20cm.
Described a kind of index sensor based on HiBi-PM-FLM is characterized in that: high-birefringence polarisation-maintaining optical fiber (4) is a D type high-birefringence polarisation-maintaining optical fiber, and length is 20～30cm.
Described a kind of index sensor based on HiBi-PM-FLM is characterized in that: it is FPC030 or FPC020 High Extinction Ratio Polarization Controller that Polarization Controller (3) can adopt model.
Described a kind of index sensor based on HiBi-PM-FLM is characterized in that: liquid tank (7) length is 30～40cm, and wide is 1～2cm, and height is 1～2cm.
The principle of work of the utility model is: incident light is divided into the light signal of two reverse transfer by 3-dB coupling mechanism (2), and by Polarization Controller (3) control light signal polarization state, two-beam is through producing phase delay behind the HiBi-PMF:
δ＝2πΔn
gL/λ
Δ n wherein
gBe the group velocity refringence, L is a HiBi-PMF length, and λ is a lambda1-wavelength.After two-beam is through whole FLM, come back to 3-dB coupling mechanism (2) and interfere, emergent light is light and dark interference fringe.With hydrofluorite the covering major part is corroded; Then it is immersed in the liquid tank (7) that fills index liquid to be measured; Extraneous variations in refractive index has changed the HiBi-FLM optical path difference, and interference fringe is changed, and monitoring reflectance spectrum wavelength shift can be realized the refractive index sensing measurement.
The beneficial effect of the utility model is: this sensor utilizes the structural design of Sagnac ring, through the corrosion covering fiber core is contacted with extraneous media, utilizes the variation of evanscent field, realizes the measurement of refractive index, and is simple in structure, easy to operate.
Description of drawings
Fig. 1 be the utility model based on HiBi-PM-FLM index sensor synoptic diagram;
Fig. 2 is a reflectance spectrum lab diagram under the different refractivity of the utility model;
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Referring to accompanying drawing 1, a kind of index sensor based on HiBi-PM-FLM is made up of incident optical (1), 3-dB coupling mechanism (2), Polarization Controller (3), high-birefringence polarisation-maintaining optical fiber (4), outgoing optical fiber (5), connection optical fiber (6) and liquid tank (7).Among the present invention 3-dB coupling mechanism (2) two ports on one side respectively with incident optical (1) and being connected of outgoing optical fiber (5); Other two ports of 3-dB coupling mechanism (2) are connected optical fiber (6) respectively and link to each other with two sections; Two connect optical fiber (6) one section high-birefringence polarisation-maintaining optical fiber of indirect (4), wherein connect a Polarization Controller (3) on one section connection optical fiber (6).3-dB coupling mechanism (2), two sections connect optical fiber (6) and high-birefringence polarisation-maintaining optical fiber (4) formation fiber loop mirror.
High-birefringence polarisation-maintaining optical fiber (4) adopts D type high-birefringence polarisation-maintaining optical fiber, and length is 25cm, and the connection optical fiber (6) that fuses at its two ends is common G.652 single-mode fiber, and length is 15cm.Incident optical (1) all adopts common G.652 single-mode fiber with outgoing optical fiber (5), and length is 30cm.It is FPC020 High Extinction Ratio Polarization Controller that Polarization Controller (3) adopts model.The high-birefringence polarisation-maintaining optical fiber (4) of ring in the mirror, concentration soaked 30 minutes in being 40% hydrofluoric acid aqueous solution; Its covering major part is corroded; So that when the polarization maintaining optical fibre after will corroding is immersed in the liquid tank (7) that fills index liquid to be measured, the evanscent field of transmission light can contact with extraneous medium in fibre core.Figure (2) is a measured spectrogram under the different extraneous mediums, and the drift through the monitoring interference spectrum realizes the measurement of extraneous liquid refractivity.
Claims (5)
1. the index sensor based on HiBi-PM-FLM is characterized by: be made up of incident optical (1), 3-dB coupling mechanism (2), Polarization Controller (3), high-birefringence polarisation-maintaining optical fiber (4), outgoing optical fiber (5), connection optical fiber (6) and liquid tank (7); Among the present invention 3-dB coupling mechanism (2) two ports on one side respectively with incident optical (1) and being connected of outgoing optical fiber (5); Other two ports of 3-dB coupling mechanism (2) are connected optical fiber (6) respectively and link to each other with two sections; Two connect optical fiber (6) one section high-birefringence polarisation-maintaining optical fiber of indirect (4), wherein connect a Polarization Controller (3) on one section connection optical fiber (6); 3-dB coupling mechanism (2), two sections connect optical fiber (6) and high-birefringence polarisation-maintaining optical fiber (4) formation fiber loop mirror.
2. a kind of index sensor according to claim 1 based on HiBi-PM-FLM; It is characterized in that: incident optical (1), outgoing optical fiber (5) and be connected that G.652 optical fiber (6) can adopt, single-mode fiber G.653 and G.655; Incident optical (1) and outgoing optical fiber (2) length are 20～40cm, and connecting optical fiber (6) length is 10～20cm.
3. a kind of index sensor based on HiBi-PM-FLM according to claim 1 is characterized in that: high-birefringence polarisation-maintaining optical fiber (4) is a D type high-birefringence polarisation-maintaining optical fiber, and length is 20～30cm.
4. a kind of index sensor based on HiBi-PM-FLM according to claim 1 is characterized in that: it is the High Extinction Ratio Polarization Controller of FPC030 or FPC020 that Polarization Controller (3) can adopt model.
5. a kind of index sensor based on HiBi-PM-FLM according to claim 1 is characterized in that: liquid tank (7) length is 30～40cm, and wide is 1～2cm, and height is 1～2cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202711550U CN202230020U (en) | 2011-07-27 | 2011-07-27 | Refractive index sensor based on HiBi-PM-FLM (High Birefringent Polarization Maintaining Fiber Loop Mirror) |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202711550U CN202230020U (en) | 2011-07-27 | 2011-07-27 | Refractive index sensor based on HiBi-PM-FLM (High Birefringent Polarization Maintaining Fiber Loop Mirror) |
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| Publication Number | Publication Date |
|---|---|
| CN202230020U true CN202230020U (en) | 2012-05-23 |
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| CN2011202711550U Expired - Fee Related CN202230020U (en) | 2011-07-27 | 2011-07-27 | Refractive index sensor based on HiBi-PM-FLM (High Birefringent Polarization Maintaining Fiber Loop Mirror) |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288579A (en) * | 2011-07-27 | 2011-12-21 | 中国计量学院 | High birefringent polarization maintaining fiber loop mirror (HiBi-PM-FLM)-based refractive index sensor |
| CN102788768A (en) * | 2012-07-10 | 2012-11-21 | 东北大学 | Method for measuring liquid refractive index based on novel reflection-type fiber loop mirror |
| CN110006846A (en) * | 2019-04-19 | 2019-07-12 | 哈尔滨工程大学 | A kind of the trace quantity liquid refractivity measuring device and preparation method of V-type special optical fiber |
-
2011
- 2011-07-27 CN CN2011202711550U patent/CN202230020U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288579A (en) * | 2011-07-27 | 2011-12-21 | 中国计量学院 | High birefringent polarization maintaining fiber loop mirror (HiBi-PM-FLM)-based refractive index sensor |
| CN102788768A (en) * | 2012-07-10 | 2012-11-21 | 东北大学 | Method for measuring liquid refractive index based on novel reflection-type fiber loop mirror |
| CN110006846A (en) * | 2019-04-19 | 2019-07-12 | 哈尔滨工程大学 | A kind of the trace quantity liquid refractivity measuring device and preparation method of V-type special optical fiber |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20120727 |