CN207180903U - A kind of pyrostat based on the miniature temperature probe of high germnium doped fiber - Google Patents
A kind of pyrostat based on the miniature temperature probe of high germnium doped fiber Download PDFInfo
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- CN207180903U CN207180903U CN201721289103.XU CN201721289103U CN207180903U CN 207180903 U CN207180903 U CN 207180903U CN 201721289103 U CN201721289103 U CN 201721289103U CN 207180903 U CN207180903 U CN 207180903U
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- fiber
- temperature
- doped fiber
- germnium doped
- probe
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses a kind of pyrostat based on the miniature temperature probe of high germnium doped fiber by wideband light source, fiber optical circulator, single-mode fiber, butterfly cone, high germnium doped fiber, fiber spectrometer and high temperature constant temperature chamber composition.Innovatively the high germnium doped fiber of extremely short length by way of butterfly welding welding in the end face of single-mode fiber, utilize refringence larger between highly doped germanium fiber core and covering, appropriate Free Spectral Range is obtained in the case where probe length is extremely short, the parameter for changing butterfly welding plays a part of enhancing interference contrast.Thus a kind of pyrostat of the novel miniature temperature probe of structure is formed, the thermometric upper limit is applied to temperature " point " measurement application at 600 °C or so.Therefore, the outstanding advantages of the invention are that probe size is extremely compact, and flexibility is high, good signal to noise ratio and sensitivity, and " point " especially suitable for temperature measures.
Description
Technical field
The utility model belongs to optical fibre high temp sensitive technical field, and in particular to one kind is based on the miniature thermometric of high germnium doped fiber
The pyrostat of probe.
Background technology
Fibre optic temperature sensor compares thermocouple temperature sensor, and probe is more compact, and electromagnetic interference is immunized, uses the longevity
Order longer, and be suitable for measuring small temperature change, the correlative study to it in recent years deepens continuously.
At present, all kinds of temperature sensors based on fiber grating and LPFG actually should in special dimension
With, but the temperature control of fiber grating is relatively low, generally only at 10pm/ °C or so；Although LPFG temperature is clever
Sensitivity has been lifted but also very sensitive to fibre-optical bending and extraneous refractive index, can not avoid the cross sensitivity of other factors.
In addition, both can not meet the requirement of temperature " point " measurement in probe size.
The doping concentration of germanium is high in highly doped germanium fiber core, and thermo-optical coeffecient is more common, and silicon optical fiber is higher, and heat sensitivity is good,
600 °C of high temperature can be born, while the refringence of fibre core and covering is larger, is advantageous to make the more compact thermometric spy of volume
Head.
The content of the invention
In view of the shortcomings of the prior art, the purpose of this utility model is that providing one kind is based on the miniature thermometric of high germnium doped fiber
The pyrostat of probe.Innovatively the high germnium doped fiber of extremely short length by way of butterfly welding welding in single-mode fiber
End face, using refringence larger between highly doped germanium fiber core and covering, fitted in the case where probe length is extremely short
When Free Spectral Range, change butterfly welding parameter play a part of enhancing interference contrast.Thus a kind of structure is formed
The pyrostat of novel miniature temperature probe, the thermometric upper limit are applied to temperature " point " measurement application at 600 °C or so.
The utility model is achieved through the following technical solutions：A kind of high temperature based on the miniature temperature probe of high germnium doped fiber passes
Sensor, it is characterised in that：By wideband light source (1), fiber optical circulator (2), single-mode fiber (3), butterfly cone (4), high germnium doped fiber
(5), fiber spectrometer (6) and high temperature constant temperature chamber (7) composition；The a ports phase of wideband light source (1) and fiber optical circulator (2)
Even, the b ports of fiber optical circulator (2) are connected with the left end of single-mode fiber (3)；Single-mode fiber (3), butterfly cone (4) and highly doped germanium
Optical fiber (5), which is sequentially connected, constitutes miniature temperature probe, is placed in together in high temperature constant temperature chamber (7)；Fiber optical circulator (2)
C ports are connected with fiber spectrometer (6).
The length of described high germnium doped fiber (5) is 0.7mm ~ 1mm, and core diameter is 3 μm, GeO in fibre core2Doping it is dense
Spend for 98%.
A diameter of 70 μm ~ 80 μm of the cone area of described butterfly cone (4), cone section length are 75 μm ~ 85 μm, the half of spherical fibre core
Footpath is 20 μm ~ 25 μm.
Operation principle of the present utility model is：Incident light from wideband light source (1) is from a ports of fiber optical circulator (2)
To b ports incidence single-mode fiber (3).When optical transport to butterfly bores (4), model field unbalance causes part light to enter high germnium doped fiber
(5) transmission forms cladding mode in covering, and another part light transmits as core mode in the fibre core of high germnium doped fiber (5).Two
Fresnel reflection occurs in the smooth end face of high germnium doped fiber (5) for person, cladding mode and then bores (4) recovery by butterfly, so as to fibre
Michelson interference occurs between core.The optical signal of reflection is from the b ports of fiber optical circulator (2) to c ports by fiber spectrum
Instrument (6) receives and demodulation.
The Michelson interference spectrums Free Spectral Range (FSR) depending on the light path between cladding mode, core mode
Difference, it is shown below：
(1)
In formula,Δn eff Effective refractive index for cladding mode and core mode is poor,LFor the length of high germnium doped fiber (5),λTo enter
Penetrate optical wavelength.High germnium doped fiber (5)Δn eff More than common silicon optical fiber,LCan also be obtained in the case of extremely short it is appropriate from
By spectral region.
The shape of butterfly cone (4) is symmetrical, and both sides are two pointed cones, and centre is spherical fibre core.Core mode passes through butterfly
When boring (4), the covering that cladding mode enters high germnium doped fiber (5) is motivated in the presence of model field unbalance.When cladding mode is reflected back
During butterfly cone (4), the fibre core of single-mode fiber (3) is coupled under the converging action of spherical fibre core.The structure can pass through change
The energy coupling ratio between parameter and the diameter adjustment fibre core and covering of spherical fibre core is made, plays raising interference contrast and letter
Make an uproar than effect.
When the temperature is changed, the optical path difference between cladding mode and core mode can high germnium doped fiber (5) thermal expansion and heat-
Changed under luminous effect effect, therefore Michelson interference spectrums can be observed with varying with temperature generation wave length shift.
The temperature control obtained by monitoring wave length shift is represented by：
(2)
In formula,dL/LdTFor the coefficient of thermal expansion of high germnium doped fiber (5),dΔn eff /Δn eff dTEffectively rolled over for different cladding modes
Penetrate the temperature sensitivity of rate.Understand, linear relationship be present between the wave length shift and temperature of Michelson interference spectrums, this has
Beneficial to the sensitivity for improving high temp sensitive.
The beneficial effects of the utility model are：(1) refringence between highly doped germanium fiber core and covering is larger, probe
Free Spectral Range is smaller under extremely short length, and a kind of miniature temperature probe is made, and " point " especially suitable for temperature measures；(2)
The parameter of adjustment butterfly cone (4) can easily control the energy coupling of fibre core and covering ratio, greatly improve the novel optical fiber
The signal to noise ratio of pyrostat and the accuracy of wavelength detecting.Therefore, outstanding advantages of the present utility model be probe size extremely
Compact, flexibility is high, good signal to noise ratio and sensitivity, and " point " especially suitable for temperature measures.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the pyrostat based on the miniature temperature probe of high germnium doped fiber.
Embodiment
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
Referring to accompanying drawing 1, a kind of pyrostat based on the miniature temperature probe of high germnium doped fiber is by wideband light source (1), light
Fine circulator (2), single-mode fiber (3), butterfly cone (4), high germnium doped fiber (5), fiber spectrometer (6) and high temperature constant temperature chamber
(7) form；Wideband light source (1) is connected with a ports of fiber optical circulator (2), the b ports of fiber optical circulator (2) and single-mode fiber
(3) left end is connected；Single-mode fiber (3), butterfly cone (4) and high germnium doped fiber (5) are sequentially connected and constitute miniature temperature probe,
It is placed in together in high temperature constant temperature chamber (7)；The c ports of fiber optical circulator (2) are connected with fiber spectrometer (6).
Further, the length of high germnium doped fiber (5) is 0.7mm ~ 1mm, and core diameter is 3 μm, GeO in fibre core2Mix
Miscellaneous concentration is 98%；A diameter of 70 μm ~ 80 μm of the cone area of butterfly cone (4), cone section length are 75 μm ~ 85 μm, the radius of spherical fibre core
For 20 μm ~ 25 μm.
Butterfly is bored (4) and made using taper welding, the optical fiber splicer model Fujikura 60s of use.By single-mode optics
The ends cutting of fine (3) and high germnium doped fiber (5) is smooth, changes the parameter of SM-SM welding patterns：Hand is adjusted to core mode
Dynamic, for setting fiber end face at intervals of 8 μm ~ 12 μm, overlapping is 10 μm ~ 12 μm, and adjustment 1 power of electric discharge is standard+2bit, during electric discharge
Between 1500ms ~ 2000ms, open taper welding, it is respectively 100ms ~ 200ms and 14 to set welding wait and taper weld length
μm ~ 18 μm, electric discharge welding obtains butterfly cone (4).
High temperature constant temperature chamber (7) is used for the temperature for changing miniature probe stepwise, the ripple with fiber spectrometer (6) record
Long drift value is combined to carry out the demarcation of high-temperature response to the sensor.
Operation principle of the present utility model is：Incident light from wideband light source (1) is from a ports of fiber optical circulator (2)
To b ports incidence single-mode fiber (3).When optical transport to butterfly bores (4), model field unbalance causes part light to enter high germnium doped fiber
(5) transmission forms cladding mode in covering, and another part light transmits as core mode in the fibre core of high germnium doped fiber (5).Two
Fresnel reflection occurs in the smooth end face of high germnium doped fiber (5) for person, cladding mode and then bores (4) recovery by butterfly, so as to fibre
Michelson interference occurs between core.High germnium doped fiber (5) refringence larger between fibre core and covering, grown in probe
Spend it is extremely short in the case of can also obtain appropriate Free Spectral Range.The adjustable energy between fibre core and covering of butterfly cone (4)
Coupling ratio is measured, plays a part of improving interference contrast and signal to noise ratio.When the temperature is changed, the light between cladding mode and core mode
Path difference can change under the thermal expansion of high germnium doped fiber (5) and thermo-optic effect effect, therefore can observe
Michelson interference spectrums are with varying with temperature generation wave length shift and linear relationship being between the two present.
Therefore, outstanding advantages of the present utility model are that probe size is extremely compact, and flexibility is high, good signal to noise ratio and spirit
Sensitivity, " point " especially suitable for temperature measure.
Claims (3)
- A kind of 1. pyrostat based on the miniature temperature probe of high germnium doped fiber, it is characterised in that：By wideband light source (1), light Fine circulator (2), single-mode fiber (3), butterfly cone (4), high germnium doped fiber (5), fiber spectrometer (6) and high temperature constant temperature chamber (7) form；Wideband light source (1) is connected with a ports of fiber optical circulator (2), the b ports of fiber optical circulator (2) and single-mode fiber (3) left end is connected；Single-mode fiber (3), butterfly cone (4) and high germnium doped fiber (5) are sequentially connected and constitute miniature temperature probe, It is placed in together in high temperature constant temperature chamber (7)；The c ports of fiber optical circulator (2) are connected with fiber spectrometer (6).
- 2. a kind of pyrostat based on the miniature temperature probe of high germnium doped fiber according to claim 1, its feature exist In：The length of described high germnium doped fiber (5) is 0.7mm ~ 1mm, and core diameter is 3 μm, GeO in fibre core2Doping concentration be 98%。
- 3. a kind of pyrostat based on the miniature temperature probe of high germnium doped fiber according to claim 1, its feature exist In：A diameter of 70 μm ~ 80 μm of the cone area of described butterfly cone (4), cone section length is 75 μm ~ 85 μm, and the radius of spherical fibre core is 20µm~25µm。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721289103.XU CN207180903U (en) | 2017-10-09 | 2017-10-09 | A kind of pyrostat based on the miniature temperature probe of high germnium doped fiber |
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| CN201721289103.XU CN207180903U (en) | 2017-10-09 | 2017-10-09 | A kind of pyrostat based on the miniature temperature probe of high germnium doped fiber |
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| CN207180903U true CN207180903U (en) | 2018-04-03 |
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| CN201721289103.XU Expired - Fee Related CN207180903U (en) | 2017-10-09 | 2017-10-09 | A kind of pyrostat based on the miniature temperature probe of high germnium doped fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478354A (en) * | 2017-10-09 | 2017-12-15 | 中国计量大学 | A kind of pyrostat based on the miniature temperature probe of high germnium doped fiber |
| CN109374923A (en) * | 2018-11-29 | 2019-02-22 | 中国计量大学 | A kind of Optical-Fiber Flowing Rate Sensor |
-
2017
- 2017-10-09 CN CN201721289103.XU patent/CN207180903U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478354A (en) * | 2017-10-09 | 2017-12-15 | 中国计量大学 | A kind of pyrostat based on the miniature temperature probe of high germnium doped fiber |
| CN109374923A (en) * | 2018-11-29 | 2019-02-22 | 中国计量大学 | A kind of Optical-Fiber Flowing Rate Sensor |
| CN109374923B (en) * | 2018-11-29 | 2023-06-20 | 中国计量大学 | Optical fiber flow velocity sensor |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180403 Termination date: 20181009 |