CN209069452U - A kind of multiple Fabry-Perot (FP) interferometer based in optical fiber cable - Google Patents
A kind of multiple Fabry-Perot (FP) interferometer based in optical fiber cable Download PDFInfo
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- CN209069452U CN209069452U CN201821885562.9U CN201821885562U CN209069452U CN 209069452 U CN209069452 U CN 209069452U CN 201821885562 U CN201821885562 U CN 201821885562U CN 209069452 U CN209069452 U CN 209069452U
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- perot
- optical fiber
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Abstract
The utility model provides a kind of multiple Fabry-Perot (FP) interferometer based in optical fiber cable, including wideband light source, circulator, sensing head, spectroanalysis instrument.Wherein sensing head is made of single mode optical fiber, it is characterized by: being inscribed in single mode optical fiber with femtosecond laser, obtain four parallel mirror surfaces across fibre core, fiber end face cuts wedgewise, to eliminate end face reflection interference, every two mirror surface may be constructed Fabry-Perot (FP) interferometer, therefore can form six Fabry-Perot (FP) interferometers in total.Light from wideband light source is received by circulator and is transmitted to sensing head, light is back to circulator again by sensing head, then is transmitted to spectroanalysis instrument via circulator, forms cascade Fabry-Perot (F-P) interferometer.The utility model have many advantages, such as it is compact-sized, be simple to manufacture, high mechanical strength and at low cost, to the great stability of high temperature monitoring.
Description
Technical field
The present invention provides a kind of multiple Fabry-Perot (FP) interferometers based in optical fiber cable, belong to Fibre Optical Sensor
Technical field.
Background technique
Optical fiber sensing technology is to grow up the 1970s, it is carrier for perceiving and transmitting the external world using light wave
Measured signal is the new and high technology that many economy, military power fall over each other research.Fibre optical sensor also has in superhigh temperature monitoring
Very big potentiality, especially in nuclear power, automobile, steel, in aerospace and energy industry.Various types have been developed at present
High-termperature Optical Fiber Sensor, the most commonly used is be based on fiber bragg grating (FBG), long-period gratings (LPFG) and interference
Instrument, interferometer include Mach-Zehnder interferometer (MZIs), Michelson's interferometer (MIs) and Fabry-perot interferometer
(FPIs).FBG for high temp sensitive application, which is usually inscribed by femtosecond laser, to be manufactured.Due to only occurring one in reflectance spectrum
Main wave crest, therefore wavelength trace system operatio is simple and convenient, however, the sensitivity of the temperature sensor of FBG is relatively low；LPFG
Sensor sheet reveal biggish sensor head size, and their resonance wavelength usually has relatively large bandwidth, this drop
The low resolution ratio of systematic survey.
Interference-type optical fiber pyrostat has high sensitivity, can be divided into two kinds of mode transmissions and reflection-type two major classes, transmits
Type is Mach-Zehnder (MZI) structure；Reflection-type includes Michelson's interferometer (MIs) and Fabry-perot interferometer
(FPIs).In the application of many high temperature monitorings, reflection sensor be it is preferred, especially when sensing the feedback of position be in it is narrow and
When in closed space.For interference optical fiber sensing device, system working range depends on the Free Spectral Range of output spectrum
(FSR), FSR is bigger, and working range is bigger.However, the corresponding optical path difference of bigger FSR (OPD) is smaller, and the overall with of its striped
Half high (FWHM) is also increased with it, this causes Measurement Resolution to reduce.If using cascade dual interferometer configuration, opereating specification
Significant it can increase, because optical path difference (OPD) difference between two interferometers generates " frequency is clapped " candy strip.It is most of at present
Cascade dual interferometer is to be constructed by using two distinct types of optical fiber or structure, but this needs complicated manufacturing process,
Moreover, the optical path difference (OPD) of two interferometers is difficult to control accurately.
Recently, the double FPI structures of optical fiber have been used for high temp sensitive, it utilizes surface and the optical fiber end of the point of femtosecond laser manufacture
Face is as three reflecting mirrors.Since two surfaces of femtosecond laser processing and fiber end face have different reflectivity, reduce
The visibility of output spectrum striped.In addition, fiber end face is also easy to be damaged or pollute in rugged environment.
Therefore, it is intended that explore it is a kind of for monitoring the fibre optical sensor of high temperature, by ordinary optic fibre grade in conjunction with
Kind structure makes it have biggish (substantially unlimited) measurement range and more highly sensitive reflection sensor.
Summary of the invention
The present invention is in view of the shortcomings of the prior art, provide a kind of dry based on multiple Fabry-Perot (FP) in optical fiber cable
Interferometer, the present invention have many advantages, such as it is compact-sized, be simple to manufacture, high mechanical strength and at low cost, can be used for high temperature measurement.
A kind of technical solution adopted for solving the technical problem of the present invention are as follows: multiple Fabry-based in optical fiber cable
Perot interferometer, including wideband light source, circulator, sensing head, spectroanalysis instrument.Wherein sensing head is made of single mode optical fiber,
It is characterized in that: being inscribed in single mode optical fiber with femtosecond laser, obtain four parallel mirror surfaces across fibre core, fiber end face
Wedgewise is cut, to eliminate end face reflection interference.Every two mirror surface may be constructed Fabry-Perot (FP) interference
Instrument, therefore six Fabry-Perot (FP) interferometers can be formed in total.
The core diameter and fibre diameter of the single mode optical fiber are respectively 8 μm and 125 μm.
Compared with the prior art, the invention has the advantages that:
1, sensing head selects cheap general single mode fiber to prepare, have it is at low cost, make simple advantage.
2, multiple mirror surfaces built in sensing head, may make up the superposition of multiple Fabry-Perot interferometers.
3, sensing head is good to high temperature detection stability, reusable, can be used for high temperature measurement.
Detailed description of the invention
In order to illustrate the embodiments of the present invention more clearly or technical solution, the present invention is made with reference to the accompanying drawings and examples
It further illustrates.
Fig. 1 practices system schematic for of the invention.
Fig. 2 is sensing head schematic diagram of the present invention.
In figure, 1. wideband light sources, 2. circulators, 3. sensing heads, 4. spectroanalysis instruments, 5. single mode optical fibers, 5a. single mode
Fiber core, 5b. single mode optical fiber covering, 6. mirror surfaces, 7. mirror surfaces, 8. mirror surfaces, 9. mirror surfaces, 10. wedge shapes
End face.
Specific embodiment
With reference to the accompanying drawing and embodiment the invention will be further described:
Fig. 1 show the system schematic that practices of the invention, including wideband light source 1, circulator 2, sensing head 3, light
Spectrum analysis instrument 4.Its connection type are as follows: there are three interface ends for circulator 2, are respectively as follows: light source input end, light source outlet end, feedback
End.Input end is connect with wideband light source 1, and outlet end is connect with sensing head 3, and feedback end is connected with spectroanalysis instrument 4.
Fig. 2 show the structural schematic diagram of sensing head 3 of the present invention, and the sensing head 3 is anti-by single mode optical fiber 5, first
It penetrates 6, second mirror surfaces 7 of mirror surface, third mirror surface 8, the 4th mirror surface 9 and wedge-shaped end face 10 to constitute, single mode
Optical fiber 5 includes single mode optical fiber fibre core 5a, single mode optical fiber covering 5b.
The production method and step of the sensing head are: step 1: being cut into a wedge-shaped end face 10 using cutter；The
Two steps: first mirror surface 6 across fibre core is inscribed out in single mode optical fiber using femtosecond laser；Step 3: along fibre core
Direction translate a distance, inscribe out second mirror surface 7 for being parallel to first mirror surface 6；Step 4: along
The direction of fibre core translates a distance, inscribes out the third mirror surface 8 for being parallel to mirror surface 7；Step 5: along fibre
The direction of core translates a distance, inscribes out the 4th mirror surface 9 for being parallel to mirror surface 8, the shape of four mirror surfaces
Shape is completely the same with size.In the production process, we can change the distance between mirror surface, to change the reflection of sensing head
Spectrum.The energy that wherein femtosecond laser is inscribed is 500nJ, and scanning speed is 10 μm/s.
In conjunction with Fig. 1,2, it introduces specific working principle: reaching sensing head 3 through circulator 2 by the light that wideband light source 1 issues,
The light beam is in 3, and when arriving first at first mirror surface 6, light is divided into two parts: a part reflected by mirror surface 6 and
Backtracking；Rest part continuation propagates along fiber core and reaches second mirror surface 7.Second mirror surface 7 occurs
The case where it is identical as first mirror surface 6, light is divided into two parts again: a part reflected and backtracking by mirror surface 7；
Rest part continuation propagates along fiber core and reaches third mirror surface 8.There is a situation where with for third mirror surface 8
One mirror surface 6 is also identical, and light is divided into two parts again: a part is reflected and backtracking by mirror surface 8；Rest part
Continuation propagates along fiber core and reaches the 4th mirror surface 9.When light beam reaches the 4th mirror surface 9, light is divided into
Two parts: a part is reflected and backtracking by mirror surface 9；Rest part continues to propagate along fiber core but does not return again to fibre
Core.Since every two mirror surface may be constructed Fabry-Perot (FP) interferometer, first mirror surface 6 and second
A mirror surface 7 forms a FP；First mirror surface 6 and third mirror surface 8 form a FP；First reflecting mirror
Face 6 and the 4th mirror surface 9 form a FP；Second mirror surface 7 and third mirror surface 8 form a FP；The
Two mirror surfaces 7 and the 4th mirror surface 9 form a FP；Third mirror surface 8 and the 4th formation of mirror surface 9
One FP；To form the superposition of a total of six Fabry-Perot (FP) interference.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be appreciated that, the above is only a specific embodiment of the present invention, is not intended to restrict the invention, all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (2)
1. a kind of multiple Fabry-Perot (FP) interferometer based in optical fiber cable, including wideband light source, circulator, sensing head,
Spectroanalysis instrument, connection type are as follows: circulator input terminal connects wideband light source, and circulator feedback end connects spectroanalysis instrument,
Circulator output end connects sensing head, it is characterised in that: and the sensing head is inscribed in single mode optical fiber by femtosecond laser,
Obtain what four parallel mirror surfaces were constituted, fiber end face cuts wedgewise, to eliminate end face reflection interference, every two reflection
Mirror surface may be constructed Fabry-Perot (FP) interferometer, therefore can form six Fabry-Perot (FP) interference in total
Instrument.
2. a kind of multiple Fabry-Perot (FP) interferometer based in optical fiber cable according to claim 1, feature
Are as follows: the core diameter and fibre diameter of the single mode optical fiber are respectively 8 μm and 125 μm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821885562.9U CN209069452U (en) | 2018-11-16 | 2018-11-16 | A kind of multiple Fabry-Perot (FP) interferometer based in optical fiber cable |
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| CN201821885562.9U CN209069452U (en) | 2018-11-16 | 2018-11-16 | A kind of multiple Fabry-Perot (FP) interferometer based in optical fiber cable |
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| CN201821885562.9U Expired - Fee Related CN209069452U (en) | 2018-11-16 | 2018-11-16 | A kind of multiple Fabry-Perot (FP) interferometer based in optical fiber cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111678540A (en) * | 2020-06-10 | 2020-09-18 | 杭州光飞秒科技有限公司 | Strain optical fiber sensor based on vernier effect and parallel F-P interferometer |
-
2018
- 2018-11-16 CN CN201821885562.9U patent/CN209069452U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111678540A (en) * | 2020-06-10 | 2020-09-18 | 杭州光飞秒科技有限公司 | Strain optical fiber sensor based on vernier effect and parallel F-P interferometer |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190705 Termination date: 20191116 |