CN208847209U - A kind of reflective Mach-Zender interferometer based on the tilted beam splitter of optical fiber - Google Patents
A kind of reflective Mach-Zender interferometer based on the tilted beam splitter of optical fiber Download PDFInfo
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- CN208847209U CN208847209U CN201821677615.8U CN201821677615U CN208847209U CN 208847209 U CN208847209 U CN 208847209U CN 201821677615 U CN201821677615 U CN 201821677615U CN 208847209 U CN208847209 U CN 208847209U
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- optical fiber
- beam splitter
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- fiber
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Abstract
The utility model provides a kind of reflective Mach-Zender interferometer based on the tilted beam splitter of optical fiber, including wideband light source, circulator, sensing head, spectroanalysis instrument.Wherein sensing head is made of single mode optical fiber, it is characterized by: being etched in single mode optical fiber with femtosecond laser, obtain the beam splitter through fibre core of one with 16 ° of fiber axis angle, so that the incident light a part propagated in fibre core is transmitted across beam splitter, another part is reflected to covering and Air Interface, fibre core is returned to using total reflection, two parts light is interfered and reflected at fiber end face, forms the online reflection-type Mach-Zehnder interferometer of single fiber.Light from wideband light source is received by circulator and is transmitted to sensing head, then light is back to circulator, spectroanalysis instrument is transmitted to via circulator, forms Mach-Zehnder interferometer.The utility model has many advantages, such as to be simple to manufacture, high mechanical strength and at low cost, can be used for refractive index and temperature measurement.
Description
Technical field
The utility model provides a kind of reflective Mach-Zender interferometer based on the tilted beam splitter of optical fiber, belongs to
In technical field of optical fiber sensing.
Background technique
In the 1970s, optical fiber sensing technology is developed rapidly with the development of Fibre Optical Communication Technology, relative to
For traditional sensors, with high sensitivity and resolution ratio, frequency range is very wide, and dynamic range is very big, not by electromagnetism
The advantages that interference, it is the new and high technology that many economy, military power fall over each other research, can be widely applied to each of national economy
Field is all widely used in various fields such as space flight, navigation, oil exploitation, medical treatment.In a variety of fibre optical sensors
In, the fibre optical sensor based on Mach-Zahnder interference principle is quickly grown, and becomes a weight of fibre optical sensor research field
Branch is wanted, it is continuously real-time to be widely used in the physical quantitys such as structure internal strain, stress, temperature, pressure, deformation, vibration and displacement
Safety detection, it may also be used for the monitoring etc. of the solid state of composite material is used aircraft, naval vessel, building etc. safely and complete
Whole property detection is of great significance.At this stage, also layer goes out not Mach-Zehnder interferometer of various different structures and preparation method thereof
Thoroughly, micro- conical fiber such as based on build-in cavities, the optical fiber of dislocation welding, fiber grating and special optical fiber etc..It is described above
There is very big deficiency, built-in air cavity equipment is very fragile, less robust；Its repeatability of fiber core dislocation welding is difficult to realize, and
And assembled by hand needs the plenty of time；Fiber grating writing process is complicated, higher cost, and the unstability of its structure is certain
It is limited its application in degree；Special fiber is expensive.In addition, these interferometers largely use transmission-type structure, in work
As when need to be placed in sample among light source output end and spectral detection end, in application aspect by limitation, be not particularly suitable for
The sensing measurement of narrow enclosure space.In order to overcome these disadvantages, it would be desirable to make optical fiber using new thinking and technology
Senser element.
Femtosecond laser radiation can generate lasting positive or negative refractive index in the regional area inside earth silicon material and change
Become, therefore it can be used for scribing waveguide inside earth silicon material.Although carbon dioxide laser and UV laser exposure method
The optical waveguide being used equally in production earth silicon material, but femtosecond laser imprinting method precision with higher and preferable surface
Finish.Therefore, femtosecond laser is expected to the potentiality for having very big in device production.
Utility model content
The utility model is in view of the shortcomings of the prior art, provide a kind of reflective Mach-based on the tilted beam splitter of optical fiber
Zeng Deer interferometer, the utility model have many advantages, such as it is compact-sized, be simple to manufacture, high mechanical strength and at low cost, can be used for
Temperature and refractometry.
The utility model technical solution adopted for solving the technical problem are as follows: a kind of based on the anti-of the tilted beam splitter of optical fiber
Penetrate formula Mach-Zender interferometer, including wideband light source, circulator, sensing head, spectroanalysis instrument, connection type are as follows: annular
Device input terminal connects wideband light source, and circulator feedback end connects spectroanalysis instrument, and circulator output end connects sensing head, feature
Be: the sensing head is etched in single mode optical fiber by femtosecond laser, is obtained one and is run through with 16 ° of fiber axis angle
The beam splitter of fibre core, so that the incident light a part propagated in fibre core passes through beamsplitter, another part is reflected to
Covering and Air Interface return to fibre core using total reflection, and two parts light interferes at fiber end face and be reflected back fibre core,
Form the online reflection-type Mach-Zehnder interferometer of single fiber.
The core diameter and fibre diameter of the single mode optical fiber are respectively 8 μm and 125 μm.
The beneficial effect of the utility model compared with prior art is:
1, sensing head selects cheap general single mode fiber to prepare, have it is at low cost, make simple advantage.
2, sensing head all has sensibility for temperature, stress, refractive index, can be used for survey while to environmental parameter
Amount.
3, sensing head is reflective structure, can be used for the sensing measurement of narrow space.
Detailed description of the invention
In order to illustrate more clearly of the utility model embodiment or technical solution, with reference to the accompanying drawings and examples to this reality
It is described further with novel.
Fig. 1 practices system schematic for the utility model.
Fig. 2 is the utility model sensing head schematic diagram.
In figure, 1. wideband light sources, 2. circulators, 3. sensing heads, 4. spectroanalysis instruments, 5. single mode optical fibers, 5a. single-mode optics
Long and slender core, 5b. single mode optical fiber covering, 6. beam splitters.
Specific embodiment
With reference to the accompanying drawing and embodiment is further described the utility model.
Fig. 1 show the system schematic that practices of the utility model, including wideband light source 1, circulator 2, sensing head
3, spectroanalysis instrument 4.Its connection type are as follows: circulator 2 is respectively as follows: light source input end there are three interface 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 the utility model sensing head 3, the sensing head 3, by single mode optical fiber 5, light point
Beam device 67 is constituted, and 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: wearing step 1: being etched in single mode optical fiber using femtosecond laser
Cross the beam splitter 6 of fibre core, the angle of beam splitter and fibre core is 16 °；Second step is being incited somebody to action at 6 one segment length of beam splitter
End face is cut flat with.Wherein the energy of femtosecond laser etching 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,
When the light beam reaches beam splitter 6 in 3, light is divided into two parts: a part passes through beamsplitter, and another part is reflected to
Covering and Air Interface return to fibre core using total reflection, and two parts light reconfigures and interferes in fiber end face, reach light
It can be reflected back when fibre cutting end face, form the online reflection-type Mach-Zehnder interferometer of single fiber.
Particular embodiments described above has carried out into one the purpose of this utility model, technical scheme and beneficial effects
Step is described in detail, it should be appreciated that, the foregoing is merely specific embodiment of the utility model, it is not limited to this
Utility model, within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done should all wrap
Containing being within the protection scope of the utility model.
Claims (3)
1. a kind of reflective Mach-Zender interferometer based on the tilted beam splitter of optical fiber, 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 spectrum
Analyzer, circulator output end connect sensing head；It is characterized by: the sensing head, by the single mode optical fiber of femtosecond laser
It inscribes and is constituted with 16 ° of beam splitters of fiber axis angle.
2. a kind of reflective Mach-Zender interferometer based on the tilted beam splitter of optical fiber according to claim 1, special
Sign is: the beam splitter, so that the incident light a part propagated in fibre core passes through beamsplitter, another part quilt
It is reflected into covering and Air Interface, returns to fibre core using total reflection, two parts light is interfered and reflected at fiber end face
Fibre core is returned, single fiber reflection-type Mach-Zehnder interferometer is formed.
3. a kind of reflective Mach-Zender interferometer based on the tilted beam splitter of optical fiber 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 |
|---|---|---|---|
| CN201821677615.8U CN208847209U (en) | 2018-10-16 | 2018-10-16 | A kind of reflective Mach-Zender interferometer based on the tilted beam splitter of optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821677615.8U CN208847209U (en) | 2018-10-16 | 2018-10-16 | A kind of reflective Mach-Zender interferometer based on the tilted beam splitter of optical fiber |
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| CN201821677615.8U Expired - Fee Related CN208847209U (en) | 2018-10-16 | 2018-10-16 | A kind of reflective Mach-Zender interferometer based on the tilted beam splitter of optical fiber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132851A (en) * | 2019-06-20 | 2019-08-16 | 合肥工业大学 | A kind of instantaneous two-dimensional opto-acoustic wave measurement method based on the interference of femtosecond pulse |
| CN111609874A (en) * | 2019-02-22 | 2020-09-01 | 中国计量大学 | Reflective Mach-Zehnder interferometer based on optical fiber internal inclined beam splitter |
| CN112710633A (en) * | 2020-12-08 | 2021-04-27 | 北京信息科技大学 | Method for preparing splicing structure Mach-Zehnder refractive index sensor |
-
2018
- 2018-10-16 CN CN201821677615.8U patent/CN208847209U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111609874A (en) * | 2019-02-22 | 2020-09-01 | 中国计量大学 | Reflective Mach-Zehnder interferometer based on optical fiber internal inclined beam splitter |
| CN110132851A (en) * | 2019-06-20 | 2019-08-16 | 合肥工业大学 | A kind of instantaneous two-dimensional opto-acoustic wave measurement method based on the interference of femtosecond pulse |
| CN112710633A (en) * | 2020-12-08 | 2021-04-27 | 北京信息科技大学 | Method for preparing splicing structure Mach-Zehnder refractive index sensor |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190510 Termination date: 20211016 |
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| CF01 | Termination of patent right due to non-payment of annual fee |