CN106338349A - Silicon dioxide fiber based double-microballoon temperature sensor - Google Patents
Silicon dioxide fiber based double-microballoon temperature sensor Download PDFInfo
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- CN106338349A CN106338349A CN201610778746.4A CN201610778746A CN106338349A CN 106338349 A CN106338349 A CN 106338349A CN 201610778746 A CN201610778746 A CN 201610778746A CN 106338349 A CN106338349 A CN 106338349A
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- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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Abstract
The invention relates to a silicon dioxide fiber based double-microballoon temperature sensor, and belongs to the field of fiber sensing technology. The double-microballoon temperature sensor comprises a light source, a silicon dioxide fiber module and a spectrum detector, the silicon dioxide fiber module further comprises a first coupling fiber, double microballons and a second coupling fiber, the double microballons include a microballoon structure in which first and second microballoons are connected in series on the basis of the silicon dioxide fiber, and the structure forms a Mach-Zehnder interferometer to realize high-sensitivity and high-stability detection for the ambient temperature. The detection sensitivity of the silicon dioxide fiber based double-microballoon temperature sensor can reach 20.12 pm/unit DEG C, and the sensor is characterized by small size and low loss.
Description
Technical field
The present invention relates to a kind of fibre optic temperature sensor, particularly to a kind of double microsphere temperature based on silica optical fiber
Sensor, belongs to technical field of optical fiber sensing.
Background technology
In recent years, Fibre Optical Sensor is lightweight due to having, and loss is low, and size is little, the characteristic such as electromagnetism interference, extensive
Apply in many sensory fields；Such as fibre optic temperature sensor, optic fibre refractive index sensor, fibre optic compression sensor etc..Its
, as the critical component of detection temperature parameter, in food safety, biomedicine and environment measuring etc. are square for middle fibre optic temperature sensor
Mask plays an important role.The basic functional principle of fibre optic temperature sensor is to send into the optical signal from light source through optical fiber to pass
Sense part, with the change of transducing part ambient temperature, leads to be transferred through the strong of the optical property such as light of the light of transducing part
Degree, wavelength, phase place etc. change；Send into photo-detector through optical fiber again, realize the detection to temperature, analysis, monitoring.Optical fiber
Temperature sensor combines the advantage of the subjects such as fibre opticss, precision optical machinery and microelectronics, can solve conventional temperature sensing
Device exist as poor in poor water resistance, heat-resisting quantity, can be larger, uncomfortable by electromagnetism and atomic radiation interference, heavier-weight, volume
For precision detection etc. technical barrier so that fibre optic temperature sensor is further towards sensitive, accurate, strong adaptability, compact
Develop with intelligentized direction.In sum, fibre optic temperature sensor has very big application market demand, therefore to optical fiber temperature
The research and development further of degree sensor become the task of top priority.
Content of the invention
It is an object of the invention to provide a kind of small volume, lightweight, compact conformation, stability strong based on silicon dioxide
Double microsphere temperature sensors of optical fiber.
The fundamental design idea of the present invention is: designs a kind of double microsphere temperature sensors based on silica optical fiber.It
Including light source, silica optical fiber module and spectral detector；This silica optical fiber module still further comprises the first coupling
Optical fiber, double microsphere and the second coupling optical fiber；Double microspheres include the first microsphere and the second microsphere, are a kind of based on silica optical fiber
Two micro-sphere structures being serially connected, they constitute mach zhender type interferometers；The optical transport that described light source sends
Enter double microspheres after the first coupling optical fiber, because described pair of microsphere constitutes a mach zhender type interferometer, work as environment
During temperature change, through the transmission spectrum of double microspheres, real time offset can occur, be received through double microspheres using spectral detector
The change of transmission spectrum, and then obtain ambient temperature to be measured.
For realizing the above-mentioned purpose of the present invention, technical scheme that the present invention is constituted using following technical measures is realizing.
A kind of double microsphere temperature sensors based on silica optical fiber of the present invention, including light source, silicon dioxide
Optic module and spectral detector；According to the present invention, in described silica optical fiber module, still further comprise the first coupling
Optical fiber, double microsphere and the second coupling optical fiber；Described light source is arranged at one end of double microspheres by the first coupling optical fiber, with the first coupling
The fine upstream end of closing light corresponds to；The optical transport that described light source sends enters double microspheres after the first coupling optical fiber, and light is double micro-
Propagate in ball, then enter back into the second coupling optical fiber, and interference is received by the spectral detector being positioned over this pair of microsphere other end
The change of transmission spectrum, and then obtain ambient temperature to be measured.
In technique scheme, described double microspheres are two based on the silica optical fiber microsphere knots being serially connected
Structure.
In technique scheme, two described micro-sphere structures being serially connected include the first microsphere and the second microsphere.
In technique scheme, the clad section of the first described microsphere and the second microsphere is connected, and their fibre core
Part is not connected with, and when optical transport is through the first microsphere, light beam will be by beam splitting, but when light continues to be transferred through the second microsphere
When, light beam will be converged, and this constitutes a mach zhender type interferometer.
In technique scheme, described light source is wide spectrum light source.
In technique scheme, described spectral detector is spectroanalysis instrument, and the minimum resolution of spectroanalysis instrument is
0.02nm.
Double microsphere temperature sensors based on silica optical fiber of the present invention, wherein said double microspheres are by common
Telecommunication optical fiber is prepared from；The first described coupling optical fiber and the second coupling optical fiber are used as the part that light enters and connects, and it is equal
For business telecommunication optical fiber.
Double microsphere temperature sensors based on silica optical fiber of the present invention, the double microspheres due to comprising are two
The micro-sphere structure being serially connected, when optical transport is through the first microsphere, light beam will be by beam splitting, but optical transport is through the second microsphere
When, light beam will be converged, and therefore this pair of micro-sphere structure constitutes a mach zhender type interferometer, the biography of this interferometer
Defeated intensity can be expressed as
Wherein i is the intensity of interference spectrum signal, icoAnd icl,mIt is core mode intensity respectively and m rank cladding mode is strong
Degree.φmIt is the phase contrast between core mode and m rank cladding mode.It is having between core mode and m rank cladding mode
Effect refractivity.L is the length of interferometer, and λ is lambda1-wavelength in a vacuum.
Based on equation (1), work as φmBecome π odd-multiple when, reach through the intensity of the interference spectrum signal of interferometer
Little value；In this case, minimum transfer spectrum can be expressed as
Therefore, when the temperature varies, because thermal expansion effects can cause this double microsphere based on silica optical fiber
The elongation percentage of the mach zhender type interferometer length that structure is constituted changes, and brought due to thermo-optic effectChange,
These will lead to be transferred through mould field interference spectrum signal generation in this optical fiber based on double micro-sphere structures of silica optical fiber
Skew.Because wavelength shift λ/λ that temperature changes the relative interference spectrum that δ t causes can be represented as
WhereinIt is the thermal coefficient of expansion of silica optical fiber,It is hot light
Coefficient.Using equation (4), the skew of the wavelength peak based on the interference spectrum through this mach zhender type interferometer, this Mach
Zender interferometer can serve as the change that a kind of fibre optic temperature sensor of compact conformation carrys out sense ambient temperature.
The present invention compared with prior art has the characteristics that and Advantageous Effects:
1st, the double microsphere temperature sensors based on silica optical fiber disclosed in this invention, because its pair of micro-sphere structure is
A kind of two micro-sphere structures being serially connected based on silica optical fiber, when optical transport is through the first microsphere, light beam will be divided
Bundle, but beam convergence, through the second microsphere, will occur, therefore this pair micro-sphere structure constitutes a mach zhender type and does
Interferometer, with the change of temperature, it can produce obvious interference fringe, and this can be efficiently used in sensory field.
2nd, the double microsphere temperature sensors based on silica optical fiber disclosed in this invention, because its pair of microsphere is one-dimensional
Structure, and be prepared from by common communications optical fiber, compared with other optical fiber structures, smaller, power consumption is lower.
3rd, the double microsphere temperature sensors based on silica optical fiber disclosed in this invention, its structure is simple, performance is steady
Determine and there is higher sensitivity；Its sensitivity can reach 20.12 micromicrons/degrees Celsius.
Brief description
Fig. 1 is the overall structure diagram based on double microsphere temperature sensors of silica optical fiber for the present invention；
Fig. 2 is the double micro-sphere structure schematic diagrams described in Fig. 1；
Fig. 3 is the dry of the double microsphere temperature sensors at a temperature of varying environment in the embodiment of the present invention one based on silicon dioxide
Relate to transmission spectrum schematic diagram；
Fig. 4 is the interference peaks of the double microsphere temperature sensors in the embodiment of the present invention one based on silicon dioxide with ambient temperature
Change curve.
In figure, 1- light source, 2- first couples optical fiber, the double microsphere of 3-, and 4- second couples optical fiber, 5- spectral detector, 6- bis-
Silica optical fibre module, 7- first microsphere, 8- second microsphere.
Specific embodiment
Below with reference to accompanying drawing and with embodiment, the present invention is described in further detail, but is not meant to be to this
Invent any restriction of protected content.
Double microsphere temperature sensors based on silica optical fiber of the present invention, its structure is as shown in figure 1, include light
Source 1, silica optical fiber module 6 and spectral detector 5；Still further comprise first in described silica optical fiber module 6
Coupling optical fiber 2, double microsphere 3 and the second coupling optical fiber 4；Described light source 1 is arranged at the one of double microspheres 3 by the first coupling optical fiber 2
End, corresponding with the upstream end of the first coupling optical fiber 2；The light that described light source 1 sends enters double microspheres after the first coupling optical fiber 2
3, light is propagated in double microspheres 3；Described pair of microsphere 3 is to be serially connected the microsphere knot constituting by the first microsphere 7 and the second microsphere 8
Structure, as shown in Figure 2.The first microsphere 7 that the described pair of microsphere comprises is connected with the clad section of the second microsphere 8, and their fibre
Core segment is not connected with, and when optical transport is through the first microsphere 7, light beam will be by beam splitting, but light continues transmission through second
During microsphere 8, light beam will be converged, and which constitute a mach zhender type interferometer.Then light continuation transmission enters back into second
Coupling optical fiber 4, and output interference spectral changes are received by the spectral detector 5 being positioned over this pair of microsphere other end, and then obtain
Ambient temperature to be measured.
Embodiment one
The present embodiment connects respectively according to the structure of the double microsphere temperature sensors based on silica optical fiber shown in Fig. 1
Part.
Described light source 1 is arranged at one end of double microspheres 3, the upstream end coupling optical fiber 2 with first by the first coupling optical fiber 2
Corresponding, the particular location of light source 1 is unrestricted, only need to guarantee that the light that it is launched can be directly entered the first coupling optical fiber 2.Light
Source 1 is wide spectrum light source, and the scope of the light wave long value that it is launched is between 1075nm-1095nm.
Described spectral detector 5 is arranged at the other end of double microspheres 3, and its particular location does not limit, and only need to guarantee double microspheres
After transferring out light, analysis in it is directly entered by the second coupling optical fiber 4；In the present embodiment, spectral detector 5 is spectrum analyses
Instrument.
Described pair of microsphere 3 is to be prepared from by arc discharge method using common communications optical fiber, by arranging different putting
Electric intensity can prepare the first different microsphere 7 of diameter and the second microsphere 8 with the discharge period, then utilizes electric arc melting
Method by be prepared into the first microsphere 7 be serially connected with the second microsphere 8 together with double microspheres 3, formed and a kind of be based on silicon dioxide light
Fine double micro-sphere structures,
A diameter of 236 μm of the first microsphere 7 that the described pair of microsphere 3 includes, a diameter of 226 μm of the second microsphere 8.Double microspheres
3 Refractive Index of Material n are 1.46, and the length of this pair of microsphere 3 is 462 μm.By during preparation, different strength of discharges and electric discharge are set
Persistent period, the parameter of this pair of microsphere 3 can reset.
Described first microsphere 7 is connected with the clad section of the second microsphere 8 and core segment is not connected with.During use, will
Double microspheres 3 are placed in tube furnace, and temperature range can be increased to 170 DEG C from room temperature, after temperature stabilization in stove, open light source 1, light
The optical transport that source 1 sends enters in double microspheres 3 through the first coupling optical fiber 2, and light is propagated in double microspheres 3, through being serially connected
The first microsphere 7 and the second microsphere 8, it is spectroanalysis instrument that the light of derivation enters spectral detector 5 by the second coupling optical fiber 4；
When light is propagated in double microspheres 3, spectroanalysis instrument can detect what this was constituted based on double micro-sphere structures of silica optical fiber
The interference transmission spectrum change of mach zhender type interferometer.Choosing it interferes transmission spectrum as instruction peak, and its corresponding this is based on
The sensitivity of double microsphere temperature sensors of silica optical fiber is
R=λ (a+ ξ) (5)
The interference transmission spectrum schematic diagram of the varying environment temperature being obtained by embodiment one is as shown in figure 3, the present embodiment light
The wave-length coverage of the light beam that source 1 is sent is 1075nm-1095nm, chooses the interference peaks wavelength that wavelength is 1079nm as instruction
Wavelength, corresponding wave-length coverage is 1075nm-1085nm, and in Fig. 3, the wavelength corresponding to the peak value of curve is spectroanalysis instrument inspection
The wavelength surveyed, this peak value changes with the change of ambient temperature, the different wavelength of different ambient temperature correspondences.
Should be done based on the mach zhender type that double micro-sphere structures of silica optical fiber are constituted by what embodiment one obtained
The change curve of the interference wave personal attendant ambient temperature to be measured of interferometer is used as initial temperature as shown in figure 4, choosing temperature for 30 DEG C,
Corresponding interference peaks wavelength 1079nm is initial wavelength, and with the rising of ambient temperature, interference wave length occurs linear deflection, corresponding
Sensitivity r be 20.21 micromicrons/degrees Celsius.This good linear sensitivity makes this based on silica optical fiber
Double microsphere temperature sensors are in a lot of application great potential.
Claims (6)
1. a kind of double microsphere temperature sensors based on silica optical fiber, including light source (1), silica optical fiber module (6)
With spectral detector (5)；It is characterized in that still further comprising the first coupling optical fiber in described silica optical fiber module (6)
(2), double microspheres (3) and the second coupling optical fiber (4)；Described light source (1) is arranged at double microspheres (3) by the first coupling optical fiber (2)
One end, with first coupling optical fiber (2) upstream end corresponding；The optical transport that light source (1) sends is after the first coupling optical fiber (2)
Enter double microspheres (3), light is propagated in double microspheres (3), is then transferred into the second coupling optical fiber (4) again, described by being positioned over
The spectral detector (5) of the other end of double microspheres (3) receives output optical signal, and detects the spectrum change of output light.
2. the double microsphere temperature sensors based on silica optical fiber according to claim 1 are it is characterised in that described
Double microspheres (3) are two micro-sphere structures being serially connected based on silica optical fiber.
3. the double microsphere temperature sensors based on silica optical fiber according to claim 1 and 2 are it is characterised in that described
Two micro-sphere structures being serially connected include the first microsphere (7) and the second microsphere (8).
4. the double microsphere temperature sensors based on silica optical fiber according to claim 1 and 2 are it is characterised in that described
The first microsphere (7) be connected with the clad section of the second microsphere (8), and their core segment is not connected with, and works as optical transport
When the first microsphere (7), light beam will be by beam splitting, but when light continues to be transferred through the second microsphere (8), light beam will be understood
Poly-, this constitutes a mach zhender type interferometer.
5. the double microsphere temperature sensors based on silica optical fiber according to claim 1 are it is characterised in that described
Light source (1) is wide spectrum light source.
6. the double microsphere temperature sensors based on silica optical fiber according to claim 1 are it is characterised in that described
Spectral detector (5) is spectroanalysis instrument, and the minimum resolution of spectroanalysis instrument is 0.02nm.
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Cited By (1)
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| CN114485985A (en) * | 2022-04-01 | 2022-05-13 | 哈尔滨理工大学 | Double-parameter optical fiber sensor with cascaded microsphere cavities |
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