CN109781157A - A kind of Fabry-Perot (FP) array interferometer based in optical fiber cable - Google Patents
A kind of Fabry-Perot (FP) array interferometer based in optical fiber cable Download PDFInfo
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- CN109781157A CN109781157A CN201910187335.1A CN201910187335A CN109781157A CN 109781157 A CN109781157 A CN 109781157A CN 201910187335 A CN201910187335 A CN 201910187335A CN 109781157 A CN109781157 A CN 109781157A
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Abstract
The present invention provides a kind of based on a series of Fabry-Perot (FP) the array interferometer being made of in optical fiber cable mirror surfaces, including wideband light source, circulator, sensing head, spectroanalysis instrument.Wherein sensing head is made of single mode optical fiber or multimode fibre, a series of fibre core, parallel and equidistant mirror surface are passed perpendicularly through it is characterized by: being inscribed in optical fiber with femtosecond laser, fiber end face cuts wedgewise, to eliminate end face reflection interference, every two neighboring reflection mirror surface may be constructed Fabry-Perot (FP) interferometer, and all reflecting mirrors constitute Fabry-Perot (FP) interference array sensing head.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 Fabry-Perot (F-P) array interferometer.The present invention has many advantages, such as that the main wave crest discrimination of spectrum is high, is simple to manufacture, is at low cost, to the great stability of high temperature monitoring.
Description
Technical field
The present invention provides a kind of Fabry-Perot (FP) array interferometers based in optical fiber cable, belong to Fibre Optical Sensor
Technical field.
Background technique
Fibre optical sensor high sensitivity, good compatibility have become a kind of sensing mode by favor.Based in optical fiber cable
Fabry-Perot (F-P) interferometer because of compact space, succinct reflective structure, make the excellent of fibre optical sensor
Structure is selected, however the intensity of (or trough) between each wave crest of its output spectrum is not much different, which limits it certainly
By the measurement range in spectrum.In order to increase the measurement range of fibre optical sensor, there has been proposed the cascade structure of dual interference,
This cascade structure is because optical path difference (OPD) changes so that spectral envelope changes, although the structure is (or main to the main wave crest of spectrum
Trough) identification have and improve to a certain degree, but most of double interference structures are all by two different structures or combination of materials
It forms, this just makes sensor-based system become complicated and increases difficulty of processing.Although femtosecond laser can achieve manufacture craft
It is required that but to enable the sensor of cascade structure in the discrimination of a main wave crest (or main trough) of wider spectrum range realization
Significantly improving is still a problem.For pyrostat, the discrimination for optimizing main wave crest (or main trough) is particularly important, because
Very big for monitoring temperature variation range, the service band region of senser element is significantly increased, and the intensity of signal light-wave may
It will receive violent disturbance.Therefore, there is an urgent need to the pyrostats that one kind effectively improves main wave crest (or main trough) discrimination
To cope with adverse circumstances.
Summary of the invention
The present invention is in view of the shortcomings of the prior art, provide a kind of interior by series of parallel and equidistant reflection based on optical fiber cable
Fabry-Perot (FP) interference array of mirror surface composition, mirror surface are to make optical fibre refractivity under femtosecond laser induction
What variation generated.The present invention have it is compact-sized, be simple to manufacture, the main wave crest discrimination of spectrum is high, high mechanical strength and cost
Low advantage, can be used for high temperature measurement.
The technical solution adopted for solving the technical problem of the present invention are as follows: one kind based in optical fiber cable by series of parallel and wait
Fabry-Perot (FP) interference array of the mirror surface composition of spacing, including wideband light source, sensing head, circulator, spectrum point
Analyzer.Wherein sensing head is made of single mode optical fiber or multimode fibre, it is characterised in that: is inscribed, is obtained in optical fiber with femtosecond laser
Fibre core, parallel and equidistant mirror surface are passed perpendicularly through to a series of, wherein 3-30 μm of mirror surface spacing variation range;
Mirror surface number (n) variation range 20-200, fiber end face cuts wedgewise, is interfered with eliminating end face reflection, every two
A neighboring reflection mirror surface may be constructed Fabry-Perot (FP) interferometer, and all mirror surfaces constitute Fabry-Perot
(FP) interference array sensing head.
Compared with the prior art, the invention has the advantages that:
1, sensing head selects cheap general single mode fiber or multimode fibre preparation, has at low cost, and production is simple excellent
Point.
2, sensing head is good to high temperature detection stability, reusable.
3, the main peak discrimination of sensing head feedback spectrum is high, will not be significantly affected because of the violent disturbance in the external world,
Monitoring particularly suitable for parameter in high temperature and adverse circumstances.
4, sensing device temperature measuring range is big, and sensitivity is higher.
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.
Fig. 3 is the spectrogram of sample 1.
Fig. 4 is the spectrogram of sample 2.
Fig. 5 is the spectrogram of sample 3.
In figure, 1. wideband light sources, 2. circulators, 3. sensing heads, 4. spectroanalysis instruments, 5. optical fiber, 5a. optical fiber fibre
Core,
5b. fibre cladding, 6. mirror surfaces, 7. mirror surfaces, 8. mirror surfaces, 9. mirror surfaces, 10. mirror surfaces, 11.
Mirror surface, 12. mirror surfaces, 13. wedge-shaped end faces.
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, spectrum point
Analyzer 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.Into
Mouth 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, the sensing head 3, by 5, first reflecting mirrors of optical fiber
6, second, face mirror surface 7, the n-th -2 mirror surfaces of third mirror surface 8 ..., 10, (n-1)th mirror surfaces
11, n-th of mirror surface 12 and wedge-shaped end face 13 are constituted, and optical fiber 5 includes fiber core 5a, fibre cladding 5b.
Fig. 3 show the spectrogram of sample 1 of the present invention.
Fig. 4 show the spectrogram of sample 2 of the present invention.
Fig. 5 show the spectrogram of sample 3 of the present invention.
The production method and step of the sensing head are: step 1: being cut into a wedge-shaped end face 13 using cutter；The
Two steps: first mirror surface 6 for passing perpendicularly through fibre core is inscribed out in 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 identical a distance, inscribes out the third mirror surface 8 for being parallel to mirror surface 7；Step 5:
Identical a distance is translated again along the direction of fibre core, inscribes out the 4th mirror surface 9 for being parallel to mirror surface 8, is protected
It holds identical operation and inscribes series of parallel and equidistant mirror surface, their shape and size is completely the same.It is making
In the process, we can change distance (3-30 μm of variation range) and mirror count (variation range 20- between mirror surface
200) change the reflectance spectrum of sensing head.The energy that wherein femtosecond laser is inscribed is 500nJ, and scanning speed is 10 μm/s.No
The optical fiber of same material can reach optimum efficiency by adjusting energy size and scanning speed.
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.And so on, when light beam reaches n-th of mirror surface 13,
Light is divided into two parts: a part is reflected and backtracking by mirror surface 13；Rest part continue along fiber core propagate but
No longer backtracking.Since every two mirror surface may be constructed Fabry-Perot (FP) interferometer, first reflecting mirror
Face 6 and second mirror surface 7 form a FP；Second mirror surface 7 and third mirror surface 8 form a FP；The
Three mirror surfaces 8 and the 4th mirror surface 9 form a FP；And so on, to form a series of Fabry-Perots
(FP) superposition interfered.
Since space of a whole page length is limited, attached drawing area does not mark all mirror surfaces of sensing head all, and shows only part not
The spectrogram of same parameter sample:
Fig. 3 is the spectrogram of sample 1, parameter are as follows: 9 μm are divided between mirror surface；Mirror surface number 50.
Fig. 4 is the spectrogram of sample 2, parameter are as follows: 12 μm are divided between mirror surface；Mirror surface number 60.
Fig. 5 is the spectrogram of sample 3, parameter are as follows: 15 μm are divided between mirror surface；Mirror surface number 60.
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 (3)
1. a kind of reflection mirror array interferometer based in optical fiber cable, including wideband light source, circulator, sensing head, spectrum analysis
Instrument, connection type are as follows: circulator input terminal connects wideband light source, and circulator feedback end connects spectroanalysis instrument, and circulator is defeated
Outlet connect sensing head, the sensing head is inscribed in optical fiber with femtosecond laser, obtain it is a series of pass perpendicularly through fibre core,
Parallel and equidistant mirror surface, every two neighboring reflection mirror surface may be constructed Fabry-Perot (FP) interferometer,
All mirror surfaces constitute Fabry-Perot (FP) interference array sensing head.
2. a kind of reflection mirror array interferometer based in optical fiber cable according to claim 1, it is characterized in that: fiber end face
Wedgewise is cut, to eliminate end face reflection interference.
3. a kind of reflection mirror array interferometer based in optical fiber cable according to claim 1, it is characterized in that: mirror surface
3-30 μm of spacing variation range, mirror surface number of variations range 20-200.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910187335.1A CN109781157A (en) | 2019-03-13 | 2019-03-13 | A kind of Fabry-Perot (FP) array interferometer based in optical fiber cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910187335.1A CN109781157A (en) | 2019-03-13 | 2019-03-13 | A kind of Fabry-Perot (FP) array interferometer based in optical fiber cable |
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| CN109781157A true CN109781157A (en) | 2019-05-21 |
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| CN201910187335.1A Pending CN109781157A (en) | 2019-03-13 | 2019-03-13 | A kind of Fabry-Perot (FP) array interferometer based in optical fiber cable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110887515A (en) * | 2019-11-28 | 2020-03-17 | 杭州光飞秒科技有限公司 | Parallel Fabry-Perot interferometer based on parallel reflectors in optical fiber |
| 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 |
-
2019
- 2019-03-13 CN CN201910187335.1A patent/CN109781157A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110887515A (en) * | 2019-11-28 | 2020-03-17 | 杭州光飞秒科技有限公司 | Parallel Fabry-Perot interferometer based on parallel reflectors in optical fiber |
| 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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