CN104215269A - Reflective optical fiber interferometric sensor based on spheroidal structure - Google Patents
Reflective optical fiber interferometric sensor based on spheroidal structure Download PDFInfo
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- CN104215269A CN104215269A CN201410482342.1A CN201410482342A CN104215269A CN 104215269 A CN104215269 A CN 104215269A CN 201410482342 A CN201410482342 A CN 201410482342A CN 104215269 A CN104215269 A CN 104215269A
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Abstract
The invention provides a reflective optical fiber interferometric sensor based on a spheroidal structure. The reflective optical fiber interferometric sensor based on the spheroidal structure is composed of an incident-end single-mode optical fiber, a spherical optical fiber, a sensing region single-mode optical fiber and a reflective end face; light goes into the spherical optical fiber from the incident-end single-mode optical fiber so that light in a cladding mode and light in a fiber core mode can be excited, and the light in the cladding mode and the light in the fiber core mode arrive in the reflective end face via the sensing region single-mode optical fiber, and then go back to the spherical optical fiber after being reflected to interfere with each other; the light in the cladding mode and the light in the fiber core mode have different effective refractive indexes and thus have a phase difference after being transmitted in the sensing region single-mode optical fiber; the phase difference changes under the influence of a thermo-optical coefficient and a thermal expansion coefficient, and furthermore, the waveform is enabled to change and the measurement on the physical quantity is realized by use of the drift distance of the interference waveform. The reflective optical fiber interferometric sensor based on the spheroidal structure has the advantages of compact structure, simple manufacture, consistent free spectral regions of output signals, same extinction ratio and large measurement range, and has excellent application prospect in the fields of national defense, industrial production and civil use.
Description
Technical field
The invention belongs to sensory field of optic fibre, particularly a kind of reflection-type optical fiber interference sensor based on chondritic and preparation method thereof.
Background technology
Sensing technology, the communication technology and computer technology are called as three large pillars of infotech.Compared with the sensor of other types, Fibre Optical Sensor has the plurality of advantages such as volume is little, loss is little, transmission capacity is large, electromagnetism interference, transmission sensing unite two into one.Fibre Optical Sensor directly or indirectly can measure nearly hundred kinds of physical quantitys and chemical and biomass at present, is widely used in the every field such as national defence, electric power, oil, building, medical science.
According to the principle of work of Fibre Optical Sensor, the types such as grating type optical fiber, interfere type, light scattering type can be divided into.Interferometric optical fiber sensor not only has the advantage of Fibre Optical Sensor, also have structure simple, be easy to advantages such as laying, highly sensitive, responding range is large, one of study hotspot becoming sensory field of optic fibre.
Summary of the invention
The object of the invention is for above-mentioned technical Analysis, provide a kind of reflection-type optical fiber interference sensor based on chondritic, this optical fibre sensor structure simply and easily make, the interference of core mode and cladding mode is there is in light after sensitive zones, according to the susceptibility of interfering the paddy physical quantity such as temperature, curvature to external world, the measurement of physical quantity to external world can be realized.
Technical scheme of the present invention:
A kind of reflection-type optical fiber interference sensor based on chondritic, be made up of incidence end single-mode fiber, spherical optical fiber, sensitive zones single-mode fiber, reflection end face, light enters spherical optical fiber from incidence end single-mode fiber, inspire the light of cladding mode and the light of fibre core pattern, the light of these two kinds of patterns arrives reflection end face through sensitive zones single-mode fiber, interferes after the light of two kinds of patterns after reflection arrives spherical optical fiber again; The light of these two kinds of patterns has different effective refractive indexs, phase differential is there is after transmission in sensitive zones single-mode fiber, the impact that this phase differential is subject to thermo-optical coeffecient and thermal expansivity changes, and then makes waveform change, is realized the measurement of physical quantity by the drift value of interference waveform.
Described sensitive zones single-mode optical fiber length is 1cm ~ 2cm, and the diameter of spherical optical fiber is 160 μm.
Based on a preparation method for the reflection-type optical fiber interference sensor of chondritic, step is as follows:
1) spherical end face is made
Be positioned over by single-mode fiber in heat sealing machine, use step motor control fiber end face to exceed electrode bar 170 μm, discharge capacity is 190bit, and discharge time is 900ms, and after electric discharge, fiber end face obtains the spherical end face that diameter is 160 μm;
2) spherical end face is connected
By step 1) obtained spherical end face and another root single-mode fiber be positioned in heat sealing machine, spherical end face and single-mode fiber distance are 15 μm, discharge capacity is 80bit, and discharge time is 1150ms, and spherical end face and single-mode fiber welding after electric discharge also form spherical optical fiber.
3) reflection end face is made
By step 2) single-mode fiber of obtained spherical optical fiber one end puts into fiber cutter cutting, and form reflection end face, spherical optical fiber is 1cm ~ 2cm with the distance of reflection end face.
Advantage of the present invention and beneficial effect are:
1) this sensor production is simple, and novel structure is with low cost, only uses single-mode fiber can produce this optical fibre interferometric sensor.
2) use reflex sensing structure to measure, compact conformation, sensitizing range length is minimum is only 1cm, user-friendly.
3) this sensor is reproducible, and the Free Spectral Range of output signal is consistent, and extinction ratio is identical, is convenient to demodulation.
Accompanying drawing explanation
Fig. 1 is this optical fibre sensor structure schematic diagram
In figure: 1. incidence end single-mode fiber 2. spherical optical fiber 3. sensitive zones single-mode fiber 4. reflects end face
Fig. 2 is this optical fiber sensor test schematic diagram
In figure: 5. light source 6. coupling mechanism 7. sensor 8. spectrometer
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment:
A kind of reflection-type optical fiber interference sensor based on chondritic, as shown in drawings, be made up of incidence end single-mode fiber 1, spherical optical fiber 2, sensitive zones single-mode fiber 3 and reflection end face 4, wherein sensitive zones single-mode optical fiber length is 1cm ~ 2cm, and the diameter of spherical optical fiber is 160 μm; The light that light source 5 sends enters sensor 7 through coupling mechanism 6, the light reflected through the reflection end face 4 of sensor 7 reenters coupling mechanism 6, coupling mechanism 6 light out enters spectrometer 8, when extraneous parameter change, waveform change in spectrometer 8, realizes the measurement of extraneous parameter by the drift value of interference waveform.
Should based on the preparation method of the reflection-type optical fiber interference sensor of chondritic, step is as follows:
1) spherical end face is made
Be positioned over by single-mode fiber in heat sealing machine, use step motor control fiber end face to exceed electrode bar 170 μm, discharge capacity is 190bit, and discharge time is 900ms, and after electric discharge, fiber end face obtains the spherical end face that diameter is 160 μm;
2) spherical end face is connected
By step 1) obtained spherical end face and another root single-mode fiber be positioned in heat sealing machine, spherical end face and single-mode fiber distance are 15 μm, discharge capacity is 80bit, and discharge time is 1150ms, and spherical end face and single-mode fiber welding after electric discharge also form spherical optical fiber.
3) reflection end is made
By step 2) single-mode fiber of obtained spherical optical fiber one end puts into fiber cutter cutting, and form reflection end, spherical optical fiber is 1cm ~ 2cm with the distance of reflection end face.The reflection-type optical fiber interference sensor based on chondritic can be obtained.
This optical fibre interferometric sensor is used for detected temperatures change:
Within the scope of 25 ~ 600 DEG C, temperature raise time, trough and bandwidth of rejection constant, this drift value, to the translation of long wave direction, is measured in position, can calculate temperature variation.
Claims (3)
1. the reflection-type optical fiber interference sensor based on chondritic, it is characterized in that: be made up of incidence end single-mode fiber, spherical optical fiber, sensitive zones single-mode fiber and reflection end face, light enters spherical optical fiber from incidence end single-mode fiber, inspire the light of cladding mode and the light of fibre core pattern, the light of these two kinds of patterns arrives reflection end face through sensitive zones single-mode fiber, again arrives spherical optical fiber and interfere after reflection; The light of these two kinds of patterns has different effective refractive indexs, phase differential is there is after transmission in sensitive zones single-mode fiber, the impact that this phase differential is subject to thermo-optical coeffecient and thermal expansivity changes, and then makes waveform change, is realized the measurement of physical quantity by the drift value of interference waveform.
2. according to claim 1 based on the reflection-type optical fiber interference sensor of chondritic, it is characterized in that: in described sensitive zones single-mode fiber, length is 1cm ~ 2cm, the diameter of spherical optical fiber is 160 μm.
3., as claimed in claim 1 based on a preparation method for the reflection-type optical fiber interference sensor of chondritic, it is characterized in that:
Its preparation process is as follows:
(1) spherical end face is made
Be positioned over by single-mode fiber in heat sealing machine, use step motor control fiber end face to exceed electrode bar 170 μm, discharge capacity is 190bit, and discharge time is 900ms, and after electric discharge, fiber end face obtains the spherical end face that diameter is 160 μm;
(2) spherical end face is connected
The spherical end face obtained by step (1) and another root single-mode fiber are positioned in heat sealing machine, spherical end face and single-mode fiber distance are 15 μm, discharge capacity is 80bit, and discharge time is 1150ms, and spherical end face and single-mode fiber welding after electric discharge also form spherical optical fiber;
(3) reflection end is made
The single-mode fiber of spherical optical fiber one end obtained for step (2) is put into fiber cutter cutting, forms reflection end, spherical optical fiber is 1cm ~ 2cm with the distance of reflection end face.
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| CN201410482342.1A CN104215269A (en) | 2014-09-19 | 2014-09-19 | Reflective optical fiber interferometric sensor based on spheroidal structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106500740A (en) * | 2016-10-21 | 2017-03-15 | 天津理工大学 | A kind of Radix Triplostegiae Grandiflorae component opitical fiber sensor based on magnetic field and temperature and preparation method thereof |
| CN108168583A (en) * | 2017-12-22 | 2018-06-15 | 北京信息科技大学 | The two-parameter fibre optical sensor of electric discharge welding preparation is combined based on chemical attack |
| CN108645444A (en) * | 2018-05-14 | 2018-10-12 | 南昌航空大学 | The temperature and strain gauge of optical-fiber probe type based on single spherical welding |
-
2014
- 2014-09-19 CN CN201410482342.1A patent/CN104215269A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106500740A (en) * | 2016-10-21 | 2017-03-15 | 天津理工大学 | A kind of Radix Triplostegiae Grandiflorae component opitical fiber sensor based on magnetic field and temperature and preparation method thereof |
| CN106500740B (en) * | 2016-10-21 | 2019-03-01 | 天津理工大学 | A kind of double parameter fibre optical sensors and preparation method thereof based on magnetic field and temperature |
| CN108168583A (en) * | 2017-12-22 | 2018-06-15 | 北京信息科技大学 | The two-parameter fibre optical sensor of electric discharge welding preparation is combined based on chemical attack |
| CN108168583B (en) * | 2017-12-22 | 2020-04-03 | 北京信息科技大学 | Double-parameter optical fiber sensor prepared based on chemical corrosion combined with discharge welding |
| CN108645444A (en) * | 2018-05-14 | 2018-10-12 | 南昌航空大学 | The temperature and strain gauge of optical-fiber probe type based on single spherical welding |
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Application publication date: 20141217 |